/*
 * Copyright (c) 2000, 2020 Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2020 Payara Services Ltd.
 * Copyright (c) 2021 Contributors to the Eclipse Foundation
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

/*
 * %W% %G%
 */

package com.sun.messaging.jmq.jmsserver.core;

import java.io.*;
import java.util.Map;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Vector;
import java.util.Set;
import java.util.Iterator;
import com.sun.messaging.jmq.util.DestType;
import com.sun.messaging.jmq.util.lists.*;
import com.sun.messaging.jmq.jmsserver.util.lists.*;
import com.sun.messaging.jmq.io.*;
import com.sun.messaging.jmq.util.log.Logger;
import com.sun.messaging.jmq.util.selector.Selector;
import com.sun.messaging.jmq.util.selector.SelectorFormatException;
import com.sun.messaging.jmq.jmsserver.service.ConnectionUID;
import com.sun.messaging.jmq.jmsserver.util.*;
import com.sun.messaging.jmq.jmsserver.service.Connection;
import com.sun.messaging.jmq.jmsserver.service.imq.IMQConnection;
import com.sun.messaging.jmq.jmsserver.resources.*;
import com.sun.messaging.jmq.jmsserver.persist.api.PartitionedStore;
import com.sun.messaging.jmq.jmsserver.persist.api.NoPersistPartitionedStoreImpl;
import com.sun.messaging.jmq.jmsserver.Globals;
import com.sun.messaging.jmq.jmsserver.FaultInjection;
import com.sun.messaging.jmq.jmsserver.cluster.api.ClusterBroadcast;
import com.sun.messaging.jmq.jmsserver.plugin.spi.ConsumerSpi;

public class Consumer implements ConsumerSpi, EventBroadcaster, Serializable {
    transient Logger logger = Globals.getLogger();
    static final long serialVersionUID = 3353669107150988952L;

    public static final String PREFETCH = "prefetch";

    private static boolean DEBUG = false;

    private static final FaultInjection FI = FaultInjection.getInjection();

    protected static final boolean DEBUG_CLUSTER_TXN = Globals.getConfig().getBooleanProperty(Globals.IMQ + ".cluster.debug.txn") || DEBUG;

    protected static final boolean DEBUG_CLUSTER_MSG = Globals.getConfig().getBooleanProperty(Globals.IMQ + ".cluster.debug.msg") || DEBUG_CLUSTER_TXN || DEBUG;

    transient private boolean useConsumerFlowControl = false;
    transient private int msgsToConsumer = 0;

    transient Map<PartitionedStore, LinkedHashSet<Destination>> destinationMap = Collections
            .synchronizedMap(new LinkedHashMap<PartitionedStore, LinkedHashSet<Destination>>());

    protected transient BrokerResources br = Globals.getBrokerResources();

    private static boolean C_FLOW_CONTROL_ALLOWED = Globals.getConfig().getBooleanProperty(Globals.IMQ + ".destination.flowControlAllowed", true);

    long lastAckTime = 0;

    SessionUID sessionuid = null;
    DestinationUID dest;
    ConsumerUID uid;
    transient ConsumerUID stored_uid;
    ConnectionUID conuid = null;
    transient boolean valid = true;
    transient boolean active = true;
    transient boolean paused = false;
    transient int pauseCnt = 0;
    transient int pauseFlowCnt = 0;
    transient int resumeFlowCnt = 0;
    boolean noLocal = false;
    transient boolean busy = false;
    transient Subscription parent = null;
    transient boolean isSpecialRemote = false;

    transient boolean isFailover = false;
    transient int position = 0;
    transient int lockPosition = -1;

    transient EventBroadcastHelper evb = null;

    boolean ackMsgsOnDestroy = true;

    transient int flowCount = 0;
    transient boolean flowPaused = false;

    transient int msgsOut = 0;

    transient int prefetch = -1; // unlimited
    transient int remotePrefetch = -1;

    transient String creator = null;

    transient boolean requestedRecreation = false;

    /**
     * Optional selector string specified by the client application.
     */
    protected String selstr = null;
    protected transient Selector selector = null;

    transient NFLPriorityFifoSet<PacketReference> msgs;
    protected transient Map<PartitionedStore, SubSet> parentListMap = Collections.synchronizedMap(new LinkedHashMap<PartitionedStore, SubSet>());
    protected transient Map plistenerMap = Collections.synchronizedMap(new LinkedHashMap<PartitionedStore, Object>());

    private transient Object mlistener = null;

    private transient boolean localConsumerCreationReady = false;

    private static final int DEFAULT_MSG_MAX_CONSECUTIVE_ROLLBACKS = 0;
    public static final int MSG_MAX_CONSECUTIVE_ROLLBACKS = Globals.getConfig().getIntProperty(Globals.IMQ + ".transaction.message.maxConsecutiveRollbacks",
            DEFAULT_MSG_MAX_CONSECUTIVE_ROLLBACKS);

    private transient HashMap messageRollbacks = new HashMap();

    transient EventListener busylistener = null;

    class BusyListener implements EventListener {
        @Override
        public void eventOccured(EventType type, Reason r, Object target, Object oldval, Object newval, Object userdata) {

            assert type == EventType.EMPTY;
            assert newval instanceof Boolean;
            checkState(null);
        }
    }

    transient EventListener removeListener = null;

    class RemoveListener implements EventListener {
        @Override
        public void eventOccured(EventType type, Reason r, Object target, Object oldval, Object newval, Object userdata) {
            assert type == EventType.SET_CHANGED_REQUEST;
            if (!(r instanceof RemoveReason)) {
                return;
            }
            // OK .. we are only registered to get the
            // following events:
            // RemoveReason.EXPIRED
            // RemoveReason.PURGED
            // RemoveReason.REMOVED_LOW_PRIORITY
            // RemoveReason.REMOVED_OLDEST
            // RemoveReason.REMOVED_REJECTED
            // RemoveReason.REMOVED_OTHER
            assert r != RemoveReason.UNLOADED;
            assert r != RemoveReason.ROLLBACK;
            assert r != RemoveReason.DELIVERED;
            assert r != RemoveReason.ACKNOWLEDGED;
            assert r != RemoveReason.ROLLBACK;
            assert r != RemoveReason.OVERFLOW;
            assert r != RemoveReason.ERROR;
            PacketReference ref = (PacketReference) oldval;
            msgs.remove(ref);
            if (DEBUG || DEBUG_CLUSTER_MSG) {
                logger.log(logger.INFO, "Consumer.removeListener: removed msg " + ref + " from msgs in consumer " + Consumer.this);
            }
            if (!ref.isLocal() && ref.getMessageDeliveredAck(uid)) {
                try {
                    Map props = new HashMap();
                    props.put(Consumer.PREFETCH, Integer.valueOf(1));
                    Globals.getClusterBroadcast().acknowledgeMessage(ref.getBrokerAddress(), ref.getSysMessageID(), uid, ClusterBroadcast.MSG_DELIVERED, props,
                            false);
                } catch (Exception e) {
                    if (DEBUG) {
                        logger.logStack(Logger.INFO, "Cannot send DELIVERED ack for message " + ref + " for consumer " + uid, e);
                    }
                }
            }
        }
    }

    private transient Object expiredID = null;
    private transient Object purgedID = null;
    private transient Object removedID1 = null;
    private transient Object removedID2 = null;
    private transient Object removedID3 = null;
    private transient Object removedID4 = null;

    public void addRemoveListener(EventBroadcaster l) {
        // add consumer interest in REMOVE of messages
        expiredID = l.addEventListener(removeListener, EventType.SET_CHANGED_REQUEST, RemoveReason.EXPIRED, null);
        purgedID = l.addEventListener(removeListener, EventType.SET_CHANGED_REQUEST, RemoveReason.PURGED, null);
        removedID1 = l.addEventListener(removeListener, EventType.SET_CHANGED_REQUEST, RemoveReason.REMOVED_OLDEST, null);
        removedID2 = l.addEventListener(removeListener, EventType.SET_CHANGED_REQUEST, RemoveReason.REMOVED_LOW_PRIORITY, null);
        removedID3 = l.addEventListener(removeListener, EventType.SET_CHANGED_REQUEST, RemoveReason.REMOVED_REJECTED, null);
        removedID4 = l.addEventListener(removeListener, EventType.SET_CHANGED_REQUEST, RemoveReason.REMOVED_OTHER, null);
    }

    public void removeRemoveListener(EventBroadcaster l) {
        l.removeEventListener(expiredID);
        l.removeEventListener(purgedID);
        l.removeEventListener(removedID1);
        l.removeEventListener(removedID2);
        l.removeEventListener(removedID3);
        l.removeEventListener(removedID4);
    }

    private boolean getParentBusy() {

        // Fix for CR 6875642 New direct mode hangs when creating a durable subscriber
//    	if (parent !=null){
//    		if (parent.isPaused()){
//    			return false;
//    		}
//    	}

        return (parentListMap.size() > 0 && !isParentListEmpty(parentListMap)) || (parent != null && parent.isBusy());
    }

    private static boolean isParentListEmpty(Map<PartitionedStore, SubSet> map) {
        synchronized (map) {
            Iterator<SubSet> itr = map.values().iterator();
            while (itr.hasNext()) {
                if (!itr.next().isEmpty()) {
                    return false;
                }
            }
        }
        return true;
    }

    private static SubSet getNonEmptyParentList(Map<PartitionedStore, SubSet> map, SubSet lastpl) {
        SubSet pl = null, foundpl = null;
        synchronized (map) {
            Iterator<SubSet> itr = map.values().iterator();
            while (itr.hasNext()) {
                pl = itr.next();
                if (!pl.isEmpty()) {
                    if (lastpl == null) {
                        return pl;
                    }
                    foundpl = pl;
                    if (!(foundpl == lastpl || foundpl.equals(lastpl))) {
                        return foundpl;
                    }
                }
            }
        }
        return foundpl;
    }

    public void setPrefetch(int count) {
        prefetch = count;
        useConsumerFlowControl = C_FLOW_CONTROL_ALLOWED;
    }

    @Override
    public void setPrefetch(int count, boolean useConsumerFlowControl) {
        prefetch = count;
        this.useConsumerFlowControl = useConsumerFlowControl;
    }

    public void setRemotePrefetch(int count) {
        remotePrefetch = count;
    }

    public int getRemotePrefetch() {
        return remotePrefetch;
    }

    public static int calcPrefetch(Consumer consumer, int cprefetch) {
        Destination d = consumer.getFirstDestination();
        Subscription sub = consumer.getSubscription();
        int dprefetch = -1;
        if (d != null) {
            dprefetch = (sub == null || !sub.getShared()) ? d.getMaxPrefetch() : d.getSharedConsumerFlowLimit();
        }
        int pref = (dprefetch == -1) ? cprefetch : (cprefetch == -1 ? cprefetch : (cprefetch > dprefetch ? dprefetch : cprefetch));
        return pref;
    }

    public long getLastAckTime() {
        return lastAckTime;
    }

    public void setLastAckTime(long time) {
        lastAckTime = time;
        if (parent != null) {
            parent.setLastAckTime(time);
        }
    }

    @Override
    public int getPrefetch() {
        return prefetch;
    }

    public int getPrefetchForRemote() {
        DestinationList DL = Globals.getDestinationList();
        int fetch = prefetch;
        if (DL.getMaxMessages() > 0) {
            long room = (DL.getMaxMessages() - DL.totalCount());
            if (room <= 0) {
                room = 1L;
            }
            if (fetch > room) {
                fetch = (int) room;
            }
        }
        long room = -1L, m;
        Destination d = null;
        Iterator itr = getDestinations().iterator();
        while (itr.hasNext()) {
            d = (Destination) itr.next();
            m = d.checkDestinationCapacity(null);
            if (m < 0L) {
                continue;
            }
            if (room < 0L || room > m) {
                room = m;
            }
        }
        if (room == 0) {
            room = 1L;
        }
        if (room > 0L) {
            if (fetch > room) {
                fetch = (int) room;
            }
        }
        return fetch;
    }

    public void setSubscription(Subscription sub) {
        ackMsgsOnDestroy = false;
        parent = sub;
    }

    /**
     * Triggers loading of any associated destiantions
     */
    public void load() {
        Iterator itr = getDestinations().iterator();
        while (itr.hasNext()) {
            Destination d = (Destination) itr.next();
            try {
                d.load();
            } catch (Exception ex) {
            }
        }
    }

    public String getCreator() {
        return creator;
    }

    public void setCreator(String id) {
        creator = id;
    }

    public String getClientID() {
        ConnectionUID cuid = getConnectionUID();
        if (cuid == null) {
            return "<unknown>";
        }

        Connection con = Globals.getConnectionManager().getConnection(cuid);
        return (String) con.getClientData(IMQConnection.CLIENT_ID);

    }

    public boolean isDurableSubscriber() {
        if (parent != null) {
            return parent.isDurable();
        }
        if (this instanceof Subscription) {
            return ((Subscription) this).isDurable();
        }
        return false;
    }

    public boolean getIsFlowPaused() {
        return flowPaused;
    }

    public void msgRetrieved() {
        msgsOut++;
    }

    public int totalMsgsDelivered() {
        return msgsOut;
    }

    public int numPendingAcks() {
        Session s = Session.getSession(sessionuid);
        if (s == null) {
            return 0;
        }
        return s.getNumPendingAcks(getConsumerUID());
    }

    public Subscription getSubscription() {
        return parent;
    }

    protected static Selector getSelector(String selstr) throws SelectorFormatException {
        return Selector.compile(selstr);

    }

    public Map<PartitionedStore, SubSet> getParentList() {
        Map m = new LinkedHashMap<>();
        synchronized (parentListMap) {
            m.putAll(parentListMap);
        }
        return m;
    }

    transient Object destroyLock = new Object();

    public void destroyConsumer(Set delivered, boolean destroyingDest) {
        destroyConsumer(delivered, (Map) null, false, destroyingDest, true);
    }

    public void destroyConsumer(Set delivered, boolean destroyingDest, boolean notify) {
        destroyConsumer(delivered, (Map) null, false, destroyingDest, notify);
    }

    public void destroyConsumer(Set delivered, Map remotePendings, boolean remoteCleanup, boolean destroyingDest, boolean notify) {

        if (DEBUG) {
            logger.log(logger.INFO,
                    "destroyConsumer(" + delivered.size() + ", " + remotePendings + ", " + remoteCleanup + ", " + destroyingDest + ", " + notify + ")");
        }

        synchronized (destroyLock) {
            if (!valid) {
                // already removed
                return;
            }
            valid = false; // we are going into destroy, so we are invalid
        }

        Subscription sub = parent;

        if (sub != null) {
            sub.pause("Consumer.java: destroy " + this);
        }

        pause("Consumer.java: destroy ");

        // clean up hooks to any parent list
        if (parentListMap.size() > 0 && plistenerMap.size() > 0) {
            Object pll = null;
            for (Map.Entry<PartitionedStore, SubSet> pair : parentListMap.entrySet()) {
                pll = plistenerMap.get(pair.getKey());
                if (pll != null) {
                    pair.getValue().removeEventListener(pll);
                    plistenerMap.remove(pair.getKey());
                }
            }
        }

        List<Destination> ds = getDestinations();

        Map<PartitionedStore, SubSet> oldParent = new LinkedHashMap<>();
        synchronized (parentListMap) {
            oldParent.putAll(parentListMap);
            parentListMap.clear();
        }
        if (parent != null) {
            parent.releaseConsumer(uid);
            parent = null;
            if (notify) {
                try {
                    sendDestroyConsumerNotification(remotePendings, remoteCleanup);
                } catch (Exception ex) {
                    logger.logStack(Logger.WARNING, "Sending detach notification for " + uid + " from " + parent, ex);
                }
            }
        } else {
            if ((ds == null || ds.isEmpty()) && !destroyingDest) {
                // destination already gone
                // can happen if the destination is destroyed
                logger.log(Logger.DEBUG, "Removing consumer from non-existant destination" + dest);
            } else if (!destroyingDest) {
                Iterator itr = ds.iterator();
                while (itr.hasNext()) {
                    Destination d = null;
                    try {
                        d = (Destination) itr.next();
                        d.removeConsumer(uid, remotePendings, remoteCleanup, notify);
                    } catch (Exception ex) {
                        logger.logStack(Logger.WARNING, "removing consumer " + uid + " from " + d, ex);
                    }
                }
            }
        }
        if (DEBUG) {
            logger.log(Logger.DEBUG, "Destroying consumer " + this + "[" + delivered.size() + ":" + msgs.size() + "]");
        }

        // now clean up and/or requeue messages
        // any consumed messages will stay on the session
        // until we are done

        Set<PacketReference> s = new LinkedHashSet<>(msgs);
        Reason cleanupReason = (ackMsgsOnDestroy ? RemoveReason.ACKNOWLEDGED : RemoveReason.UNLOADED);

        delivered.addAll(s);

        DestinationList DL = Globals.getDestinationList();
        // automatically ack any remote or ack On Destroy messages
        Iterator itr = delivered.iterator();
        while (itr.hasNext()) {
            PacketReference r = (PacketReference) itr.next();
            if (r == null) {
                continue;
            }
            if (ackMsgsOnDestroy || !r.isLocal()) {
                itr.remove();
                try {
                    if (r.acknowledged(getConsumerUID(), getStoredConsumerUID(), !uid.isUnsafeAck(), r.isLocal())) {
                        try {

                            Destination[] dds = DL.getDestination(r.getPartitionedStore(), r.getDestinationUID());
                            Destination d = null;
                            for (int i = 0; i < dds.length; i++) {
                                d = dds[i];
                                if (d == null) {
                                    continue;
                                }
                                if (r.isLocal()) {
                                    d.removeMessage(r.getSysMessageID(), RemoveReason.ACKNOWLEDGED);
                                } else {
                                    d.removeRemoteMessage(r.getSysMessageID(), RemoveReason.ACKNOWLEDGED, r);
                                }
                            }

                        } finally {
                            r.postAcknowledgedRemoval();
                        }
                    }
                } catch (Exception ex) {
                    logger.log(Logger.DEBUG, "Broker down Unable to acknowlege" + r.getSysMessageID() + ":" + uid, ex);
                }
            }
        }

        msgs.removeAll(s, cleanupReason);

        if (!ackMsgsOnDestroy) {
            Map<PartitionedStore, Set> map = new LinkedHashMap<>();
            Set set = null;
            PacketReference ref = null;
            PartitionedStore pstore = null;
            itr = delivered.iterator();
            while (itr.hasNext()) {
                ref = (PacketReference) itr.next();
                if (ref.getDestinationUID().isQueue()) {
                    pstore = ref.getPartitionedStore();
                } else {
                    pstore = new NoPersistPartitionedStoreImpl(getStoredConsumerUID());
                }
                set = map.get(pstore);
                if (set == null) {
                    set = new LinkedHashSet();
                    map.put(pstore, set);
                }
                set.add(ref);
            }
            SubSet pl = null;
            for (Map.Entry<PartitionedStore, Set> pair : map.entrySet()) {
                pl = oldParent.get(pair.getKey());
                if (pl != null) {
                    ((Prioritized) pl).addAllOrdered(pair.getValue());
                }
            }
            delivered.clear(); // help gc
        }

        destroy();

        if (msgs != null && mlistener != null) {
            msgs.removeEventListener(mlistener);
            mlistener = null;
        }

        if (sub != null) {
            sub.resume("Consumer.java: destroyConsumer " + this);
        }
        selstr = null;
        selector = null;
    }

    /**
     * This method is called from ConsumerHandler.
     */
    public void sendCreateConsumerNotification() throws BrokerException {

        // OK, we may have multiple consumers
        // we just want the first one

        Destination d = getFirstDestination();

        if ((dest.isWildcard() || (!d.getIsLocal() && !d.isInternal() && !d.isAdmin())) && Globals.getClusterBroadcast() != null) {
            Globals.getClusterBroadcast().createConsumer(this);
        }
    }

    public void sendDestroyConsumerNotification(Map remotePendings, boolean remoteCleanup) throws BrokerException {
        // OK, we may have multiple consumers
        // we just want the first one

        Destination d = getFirstDestination();

        if (dest.isWildcard() || (d != null && !d.getIsLocal() && !d.isInternal() && !d.isAdmin() && Globals.getClusterBroadcast() != null)) {
            Globals.getClusterBroadcast().destroyConsumer(this, remotePendings, remoteCleanup);
        }
    }

    protected void destroy() {
        valid = false;
        pause("Consumer.java: destroy()");
        synchronized (consumers) {
            consumers.remove(uid);
        }
        wildcardConsumers.remove(uid);
        selector = null; // easier for weak hashmap
        Reason cleanupReason = RemoveReason.UNLOADED;
        if (ackMsgsOnDestroy) {
            cleanupReason = RemoveReason.ACKNOWLEDGED;
        }
        Set<PacketReference> s = new HashSet<>(msgs);

        try {
            DestinationList DL = Globals.getDestinationList();
            synchronized (s) {
                Iterator<PacketReference> itr = s.iterator();
                while (itr.hasNext()) {
                    PacketReference pr = itr.next();
                    if (ackMsgsOnDestroy && pr.acknowledged(getConsumerUID(), getStoredConsumerUID(), !uid.isUnsafeAck(), true)) {
                        try {

                            Destination[] ds = DL.getDestination(pr.getPartitionedStore(), pr.getDestinationUID());
                            Destination d = ds[0];
                            if (pr.isLocal()) {
                                d.removeMessage(pr.getSysMessageID(), cleanupReason);
                            } else {
                                d.removeRemoteMessage(pr.getSysMessageID(), cleanupReason, pr);
                            }

                        } finally {
                            pr.postAcknowledgedRemoval();
                        }
                    }
                }
            }
            msgs.removeAll(s, cleanupReason);
        } catch (Exception ex) {
            logger.logStack(Logger.WARNING, br.getKString(br.W_EXCEPTION_CLEANUP_CONSUMER, this, ex.getMessage()), ex);
        }
    }

    /**
     * the list (if any) that the consumer can pull messages from
     */
    public void setParentList(PartitionedStore pstore, SubSet set) {
        if (DEBUG) {
            logger.log(Logger.INFO, "Consumer.setParentList(" + pstore + ", " + set + ")");
        }
        ackMsgsOnDestroy = false;
        SubSet pl = parentListMap.get(pstore);
        if (pl != null) {
            Object pll = plistenerMap.get(pstore);
            if (pll != null) {
                pl.removeEventListener(pll);
            }
        }
        plistenerMap.remove(pstore);

        synchronized (parentListMap) {
            if (set != null) {
                parentListMap.put(pstore, set);
                plistenerMap.put(pstore, set.addEventListener(busylistener, EventType.EMPTY, null));
            }
        }
        checkState(null);
    }

    protected void getMoreMessages(int num) {
        Map<PartitionedStore, SubSet> ss = new LinkedHashMap<>();
        synchronized (parentListMap) {
            ss.putAll(parentListMap);
        }
        if (paused || ss.size() == 0 || isParentListEmpty(ss) || (parent != null && parent.isPaused())) {
            // nothing to do
            return;
        } else {
            // pull
            int count = 0;
            if (isParentListEmpty(ss)) {
                return;
            }
            SubSet pl = null;
            while (!isFailover && isActive() && !isPaused() && isValid() && ss != null && (pl = getNonEmptyParentList(ss, pl)) != null && count < num
                    && (parent == null || !parent.isPaused())) {

                PacketReference mm = (PacketReference) pl.removeNext();
                if (mm == null) {
                    continue;
                }
                msgs.add(11 - mm.getPriority(), mm);
                count++;
                busy = true;
            }
        }

    }

    void setIsActiveConsumer(boolean active) {
        isFailover = !active;
        checkState(null);
    }

    public boolean getIsFailoverConsumer() {
        return isFailover;
    }

    public boolean getIsActiveConsumer() {
        return !isFailover;
    }

    /**
     * handles transient data when class is deserialized
     */
    private void readObject(java.io.ObjectInputStream ois) throws IOException, ClassNotFoundException {
        ois.defaultReadObject();
        logger = Globals.getLogger();
        remotePendingResumes = new ArrayList();
        lastDestMetrics = new Hashtable();
        localConsumerCreationReady = false;
        parent = null;
        busy = false;
        paused = false;
        flowPaused = false;
        flowCount = 0;
        active = true;
        valid = true;
        destroyLock = new Object();
        destinationMap = Collections.synchronizedMap(new LinkedHashMap<PartitionedStore, LinkedHashSet<Destination>>());
        parentListMap = Collections.synchronizedMap(new LinkedHashMap<PartitionedStore, SubSet>());
        plistenerMap = Collections.synchronizedMap(new LinkedHashMap<PartitionedStore, Object>());
        mlistener = null;
        prefetch = -1;
        isFailover = false;
        position = 0;
        isSpecialRemote = false;
        useConsumerFlowControl = false;
        stored_uid = null;
        active = true;
        pauseCnt = 0;
        try {
            selector = getSelector(selstr);
        } catch (Exception ex) {
            logger.logStack(Logger.ERROR, "Internal Error: bad stored selector[" + selstr + "], ignoring", ex);
            selector = null;
        }
        initInterest();
    }

    @Override
    public boolean isBusy() {
        return busy;
    }

    @Override
    public DestinationUID getDestinationUID() {
        return dest;
    }

    protected Consumer(ConsumerUID uid) {
        // used for removing a consumer during load problems
        // only
        // XXX - revisit changing protocol to use UID so we
        // dont have to do this
        this.uid = uid;
    }

    public static Consumer newInstance(ConsumerUID uid) {
        return new Consumer(uid);
    }

    public Consumer(DestinationUID d, String selstr, boolean noLocal, ConnectionUID con_uid) throws IOException, SelectorFormatException {
        dest = d;
        this.noLocal = noLocal;
        uid = new ConsumerUID();
        uid.setConnectionUID(con_uid);
        this.selstr = selstr;
        selector = getSelector(selstr);
        initInterest();
        if (DEBUG) {
            logger.log(Logger.INFO, "Consumer: created new consumer " + uid + " on destination " + d + " with selector " + selstr);
        }

    }

    public Consumer(DestinationUID d, String selstr, boolean noLocal, ConsumerUID uid) throws IOException, SelectorFormatException {
        dest = d;
        this.noLocal = noLocal;
        this.uid = uid;
        if (uid == null) {
            this.uid = new ConsumerUID();
        }

        this.selstr = selstr;
        selector = getSelector(selstr);
        initInterest();
    }

    public static Consumer newConsumer(DestinationUID destid, String selectorstr, boolean isnolocal, ConsumerUID consumerid)
            throws IOException, SelectorFormatException, ConsumerAlreadyAddedException {
        synchronized (consumers) {
            if (consumers.get(consumerid) != null) {
                throw new ConsumerAlreadyAddedException(Globals.getBrokerResources().getKString(BrokerResources.I_CONSUMER_ALREADY_ADDED, consumerid, destid));
            }
            return new Consumer(destid, selectorstr, isnolocal, consumerid);
        }
    }

    public void localConsumerCreationReady() {
        synchronized (consumers) {
            localConsumerCreationReady = true;
        }
    }

    private boolean isLocalConsumerCreationReady() {
        synchronized (consumers) {
            return localConsumerCreationReady;
        }
    }

    public boolean isValid() {
        return valid;
    }

    protected void initInterest() {
        removeListener = new RemoveListener();
        busylistener = new BusyListener();
        evb = new EventBroadcastHelper();
        msgs = new NFLPriorityFifoSet<>(12, false);
        mlistener = msgs.addEventListener(busylistener, EventType.EMPTY, null);
        synchronized (consumers) {
            consumers.put(uid, this);
        }
        if (dest.isWildcard()) {
            wildcardConsumers.add(uid);
        }

    }

    protected static void attachConsumers(DestinationList dl) throws BrokerException {
        try {

            DestinationList DL = Globals.getDestinationList();
            Consumer c = null;
            DestinationUID did = null;
            synchronized (consumers) {
                Iterator itr = consumers.values().iterator();
                while (itr.hasNext()) {
                    c = (Consumer) itr.next();
                    if (c instanceof Subscription) {
                        continue;
                    }
                    did = c.getDestinationUID();
                    if (did.isWildcard()) {
                        List<DestinationUID> dids = DL.findMatchingIDsByDestinationList(dl, did);
                        Iterator itr1 = dids.iterator();
                        while (itr1.hasNext()) {
                            DestinationUID match_did = (DestinationUID) itr1.next();
                            Destination d = DL.getDestinationByDestinationList(dl, match_did);
                            d.addConsumer(c, false, null, true);
                            Globals.getLogger().log(Logger.INFO, "XXXI18N attached regular consumer " + c + " to partition " + dl);
                        }

                    } else {
                        Destination d = DL.getDestinationByDestinationList(dl, did.getName(),
                                (did.isQueue() ? DestType.DEST_TYPE_QUEUE : DestType.DEST_TYPE_TOPIC), true, true);
                        d.addConsumer(c, false, null, true);
                        Globals.getLogger().log(Logger.INFO, "XXXI18N attached regular consumer " + c + " to partition " + dl);
                    }

                }
            }
        } catch (Exception e) {
            Globals.getLogger().logStack(Logger.ERROR, e.getMessage(), e);
            if (e instanceof BrokerException) {
                throw (BrokerException) e;
            }
            throw new BrokerException(e.getMessage(), e);
        }
    }

    public PacketReference peekNext() {
        // ok first see if there is anything on msgs
        PacketReference ref = msgs.peekNext();
        if (ref == null && parentListMap.size() > 0) {
            synchronized (parentListMap) {
                Iterator<SubSet> itr = parentListMap.values().iterator();
                while (itr.hasNext()) {
                    ref = (PacketReference) itr.next().peekNext();
                    if (ref != null) {
                        break;
                    }
                }
            }
        }
        return ref;
    }

    public void setAckMsgsOnDestroy(boolean ack) {
        ackMsgsOnDestroy = ack;
    }

    @Override
    public ConsumerUID getConsumerUID() {
        return uid;
    }

    public void setStoredConsumerUID(ConsumerUID uid) {
        stored_uid = uid;
    }

    @Override
    public ConsumerUID getStoredConsumerUID() {
        if (stored_uid == null) {
            return uid;
        }
        return stored_uid;
    }

    public void messageCommitted(SysMessageID sysid) {
        if (MSG_MAX_CONSECUTIVE_ROLLBACKS <= 0) {
            return;
        }
        synchronized (messageRollbacks) {
            messageRollbacks.clear();
        }
    }

    public boolean addRollbackCnt(SysMessageID sysid, int maxRollbacks) {
        if (maxRollbacks <= 0 && MSG_MAX_CONSECUTIVE_ROLLBACKS <= 0) {
            return true;
        }
        int maxrb = maxRollbacks;
        if (maxRollbacks <= 0) {
            maxrb = MSG_MAX_CONSECUTIVE_ROLLBACKS;
        }
        synchronized (messageRollbacks) {
            Integer count = (Integer) messageRollbacks.get(sysid);
            if (count == null) {
                messageRollbacks.put(sysid, Integer.valueOf(0));
                return true;
            }
            int cnt = count.intValue();
            if (cnt < maxrb) {
                messageRollbacks.put(sysid, Integer.valueOf(++cnt));
                return true;
            }
            return false;
        }
    }

    public boolean routeMessages(Collection<PacketReference> c, boolean toFront) {
        if (toFront) {
            if (!valid) {
                return false;
            }
            msgs.addAllToFront(c, 0);
            synchronized (destroyLock) {
                msgsToConsumer += c.size();
            }
            checkState(null);
        } else {
            Iterator<PacketReference> itr = c.iterator();
            while (itr.hasNext()) {
                routeMessage(itr.next(), false);
            }
        }
        if (!valid) {
            return false;
        }
        return true;
    }

    /**
     * called from load transactions, when we need to unroute a message that has been consumed in a prepared transaction
     */
    public boolean unrouteMessage(PacketReference p) {
        boolean b = msgs.remove(p);
        if (b) {
            msgsToConsumer--;
        }
        return b;
    }

    /**
     * can be called from cluster dispatch thread for remote messages on return false, must ensure message not routed
     */
    public boolean routeMessage(PacketReference p, boolean toFront) {
        return routeMessage(p, toFront, false);
    }

    /**
     * @param toFront ignored if ordered true
     */
    public boolean routeMessage(PacketReference p, boolean toFront, boolean ordered) {
        int position = 0;
        if (!toFront && !ordered) {
            position = 11 - p.getPriority();
        }

        ArrayList<PacketReference> a = null;
        if (ordered) {
            a = new ArrayList<>();
            a.add(p);
        }

        synchronized (destroyLock) {
            if (!valid) {
                return false;
            }
            if (ordered) {
                msgs.addAllOrdered(a);
            } else {
                msgs.add(position, p);
            }
            msgsToConsumer++;
        }

        checkState(null);

        if (a != null) {
            a.clear();
            a = null;
        }
        return true;
    }

    public int size() {
        return msgs.size();
    }

    // messages in this list may be in:
    // - in msgs;
    // - in session list
    public int numInProcessMsgs() {
        int cnt = size();
        cnt += numPendingAcks();
        return cnt;
    }

    public void unloadMessages() {
        msgs.clear();
        synchronized (destroyLock) {
            msgsToConsumer = 0;
        }
    }

    @Override
    public void attachToConnection(ConnectionUID uid) {
        this.conuid = uid;
        this.uid.setConnectionUID(uid);
    }

    @Override
    public void attachToSession(SessionUID uid) {
        this.sessionuid = uid;
    }

    public void attachToDestination(Destination d, PartitionedStore pstore) {
        synchronized (destinationMap) {
            LinkedHashSet<Destination> ds = destinationMap.get(pstore);
            if (ds == null) {
                ds = new LinkedHashSet<>();
                destinationMap.put(pstore, ds);
                ds.add(d);
            }
        }
    }

    public Set getUniqueDestinations() {
        LinkedHashSet<Destination> snapshot = new LinkedHashSet<>();
        snapshot.addAll(getDestinations());
        return snapshot;
    }

    protected List<Destination> getDestinations() {
        List<Destination> snapshot = new ArrayList<>();

        synchronized (destinationMap) {
            if (destinationMap.size() == 0) {
                DestinationList DL = Globals.getDestinationList();
                if (!dest.isWildcard()) {
                    Map<PartitionedStore, Destination> mp = DL.getDestinationMap(null, dest);
                    LinkedHashSet set = null;
                    for (Map.Entry<PartitionedStore, Destination> pair : mp.entrySet()) {
                        set = destinationMap.get(pair.getKey());
                        if (set == null) {
                            set = new LinkedHashSet<>();
                            destinationMap.put(pair.getKey(), set);
                        }
                        set.add(pair.getValue());
                    }
                } else {
                    Map<PartitionedStore, LinkedHashSet<Destination>> mp = DL.findMatchingDestinationMap(null, dest);
                    destinationMap.putAll(mp);
                }
            }
            Iterator<LinkedHashSet<Destination>> itr = destinationMap.values().iterator();
            while (itr.hasNext()) {
                snapshot.addAll(itr.next());
            }
        }
        return snapshot;
    }

    @Override
    public Destination getFirstDestination() {
        Iterator itr = getDestinations().iterator();
        Destination d = (Destination) (itr.hasNext() ? itr.next() : null);
        return d;
    }

    public SessionUID getSessionUID() {
        return sessionuid;
    }

    @Override
    public ConnectionUID getConnectionUID() {
        return conuid;
    }

    @Override
    public Object getAndFillNextPacket(Packet p) {
        PacketReference ref = null;

        if (flowPaused || paused) {
            checkState(null);
            return null;
        }
        if (!valid) {
            return null;
        }
        if (!paused && msgs.isEmpty()) {
            getMoreMessages(prefetch <= 0 ? 1000 : prefetch);
        }

        Packet newpkt = null;

        while (valid && !paused && !msgs.isEmpty()) {
            if (FI.FAULT_INJECTION) {
                HashMap fips = new HashMap();
                fips.put(FaultInjection.DST_NAME_PROP, getDestinationUID().getName());
                if (FI.checkFaultAndSleep(FI.FAULT_CONSUMER_SLEEP_BEFORE_MSGS_REMOVE_NEXT, fips)) {
                    FI.unsetFault(FI.FAULT_CONSUMER_SLEEP_BEFORE_MSGS_REMOVE_NEXT);
                }
            }
            ref = msgs.removeNext();
            if (ref == null || ref.isOverrided()) {
                int loglevel = (DEBUG_CLUSTER_MSG) ? Logger.INFO : Logger.DEBUG;
                logger.log(loglevel, (ref == null) ? "Consumer [" + getConsumerUID() + "] get message null reference"
                        : "Consumer [" + getConsumerUID() + "] message requened: " + ref);
                continue;
            }
            newpkt = ref.getPacket();
            boolean expired = ref.isExpired();
            if (FI.FAULT_INJECTION) {
                HashMap fips = new HashMap();
                fips.put(FaultInjection.DST_NAME_PROP, ref.getDestinationUID().getName());
                if (FI.checkFault(FI.FAULT_MSG_EXPIRE_AT_DELIVERY, fips)) {
                    expired = true;
                    FI.unsetFault(FI.FAULT_MSG_EXPIRE_AT_DELIVERY);
                }
            }
            boolean islocal = ref.isLocal();
            boolean remoteDeliveredAck = (!islocal && ref.getMessageDeliveredAck(uid));
            if (expired || !ref.checkRemovalAndSetInDelivery(getStoredConsumerUID())) {
                if (!expired) {
                    expired = ref.isExpired();
                }
                try {
                    if (expired) {

                        String cmt = br.getKString(br.I_RM_EXPIRED_MSG_BEFORE_DELIVER_TO_CONSUMER, ref.getSysMessageID(),
                                "[" + uid + ", " + uid.getAckMode() + "]" + dest);
                        String cmtr = br.getKString(br.I_RM_EXPIRED_REMOTE_MSG_BEFORE_DELIVER_TO_CONSUMER, ref.getSysMessageID(),
                                "[" + uid + ", " + uid.getAckMode() + "]" + dest);

                        if (ref.markDead(uid, getStoredConsumerUID(), (islocal ? cmt : cmtr), null, RemoveReason.EXPIRED_ON_DELIVERY, -1, null,
                                remoteDeliveredAck)) {
                            try {

                                boolean removed = false;
                                DestinationList DL = Globals.getDestinationList();
                                Destination[] ds = DL.getDestination(ref.getPartitionedStore(), ref.getDestinationUID());
                                Destination d = ds[0];
                                if (d != null) {
                                    if (ref.isDead()) {
                                        removed = d.removeDeadMessage(ref);
                                    } else {
                                        removed = d.removeMessage(ref.getSysMessageID(), RemoveReason.REMOVED_OTHER, !expired);
                                    }
                                    if (removed && expired && DL.getVerbose()) {
                                        logger.log(logger.INFO, (islocal ? cmt : cmtr));
                                    }
                                }

                            } finally {
                                ref.postAcknowledgedRemoval();
                            }
                        }

                    } else {
                        if (DEBUG) {
                            logger.log(Logger.INFO, "Message " + ref + (newpkt == null ? "[null]" : "") + " in removal,  not deliver to consumer " + this);
                        }
                        if (remoteDeliveredAck) {
                            try {
                                Map props = new HashMap();
                                props.put(Consumer.PREFETCH, Integer.valueOf(1));
                                Globals.getClusterBroadcast().acknowledgeMessage(ref.getBrokerAddress(), ref.getSysMessageID(), uid,
                                        ClusterBroadcast.MSG_DELIVERED, props, false);
                            } catch (Exception e) {
                                if (DEBUG) {
                                    logger.logStack(Logger.INFO, "Cannot send DELIVERED ack for message " + ref + " for consumer " + uid, e);
                                }
                            }
                        }
                    }

                } catch (Exception ex) {
                    if (newpkt != null && DEBUG) {
                        logger.logStack(Logger.INFO, "Unable to cleanup expired message " + ref + " for consumer " + this, ex);
                    }
                }
                ref = null;
                newpkt = null;
                continue;
            }

            break;
        }
        if (!valid) {
            if (DEBUG_CLUSTER_MSG) {
                logger.log(Logger.INFO, "getAndFillNextPacket(): consumer " + this + " closed, discard ref " + ref);
            }
            return null;
        }
        if (ref == null) {
            checkState(null);
            return null;
        }

        newpkt = ref.getPacket();
        if (newpkt == null) {
            assert false;
            return null;
        }

        if (p != null) {
            try {
                p.fill(newpkt);
            } catch (IOException ex) {
                logger.logStack(Logger.INFO, "Internal Exception processing packet ", ex);
                return null;
            }
            p.setConsumerID(uid.longValue());
            ConsumerUID suid = getStoredConsumerUID();
            boolean rflag = ref.getRedeliverFlag(suid);
            p.setRedelivered(rflag);
            int rcnt = ref.getRedeliverCount(suid) + 1;
            if (rflag) {
                if (rcnt < 2) {
                    rcnt = 2;
                }
            }
            if (DEBUG) {
                logger.log(Logger.INFO, "Consumer.getAndFillNextPacket: Set DeliveryCount to " + rcnt + " for message " + ref + " for consumer " + this);
            }
            p.setDeliveryCount(rcnt);
            if (ref.isLast(uid)) {
                ref.removeIsLast(uid);
                p.setIsLast(true);
            }
            msgRetrieved();
            if (parent != null) {
                // hey, we pulled one from the durable too
                parent.msgRetrieved();
            }
        } else {
            newpkt.setRedelivered(ref.getRedeliverFlag(getStoredConsumerUID()));
        }

        if (useConsumerFlowControl) {
            if (prefetch != -1) {
                flowCount++;
            }
            if (!flowPaused && ref.getMessageDeliveredAck(uid)) {
                BrokerAddress addr = ref.getBrokerAddress();
                if (addr != null) { // do we have a remove
                    synchronized (remotePendingResumes) {
                        remotePendingResumes.add(ref);
                    }
                } else {
                }
                if (p != null) {
                    p.setConsumerFlow(true);
                }
            }
            if (prefetch > 0 && flowCount >= prefetch) {
                if (p != null) {
                    p.setConsumerFlow(true);
                }
                ref.addMessageDeliveredAck(uid);
                BrokerAddress addr = ref.getBrokerAddress();
                if (addr != null) { // do we have a remove
                    synchronized (remotePendingResumes) {
                        remotePendingResumes.add(ref);
                    }
                }
                pauseFlowCnt++;
                flowPaused = true;
            }
        } else if (ref.getMessageDeliveredAck(uid)) {
            HashMap props = null;
            ConnectionUID cuid = getConnectionUID();
            if (cuid != null) {
                IMQConnection con = (IMQConnection) Globals.getConnectionManager().getConnection(cuid);
                if (con != null) {
                    props = new HashMap();
                    props.put(Consumer.PREFETCH, Integer.valueOf(con.getFlowCount()));
                }
            }
            try {
                Globals.getClusterBroadcast().acknowledgeMessage(ref.getBrokerAddress(), ref.getSysMessageID(), uid, ClusterBroadcast.MSG_DELIVERED, props,
                        false);
            } catch (BrokerException ex) {
                logger.log(Logger.DEBUG, "Can not send DELIVERED ack " + " received ", ex);
            }
            ref.removeMessageDeliveredAck(uid);
        }
        return ref;

    }

    public void purgeConsumer() throws BrokerException {
        Reason cleanupReason = RemoveReason.ACKNOWLEDGED;
        Set<PacketReference> set = new HashSet<>(msgs);
        if (set.isEmpty()) {
            return;
        }
        msgs.removeAll(set, cleanupReason);
        Iterator<PacketReference> itr = set.iterator();
        while (itr.hasNext()) {
            try {
                PacketReference pr = itr.next();
                if (pr.acknowledged(getConsumerUID(), getStoredConsumerUID(), !uid.isUnsafeAck(), true)) {
                    try {

                        DestinationList DL = Globals.getDestinationList();
                        Destination[] ds = DL.getDestination(pr.getPartitionedStore(), pr.getDestinationUID());
                        Destination d = ds[0];
                        d.removeMessage(pr.getSysMessageID(), cleanupReason);

                    } finally {
                        pr.postAcknowledgedRemoval();
                    }
                }
            } catch (IOException ex) {
                logger.logStack(Logger.WARNING, "Purging consumer " + this, ex);
            }
        }

    }

    public boolean isWildcard() {
        return dest.isWildcard();
    }

    public void purgeConsumer(Filter f) throws BrokerException {
        Reason cleanupReason = RemoveReason.ACKNOWLEDGED;
        Set<PacketReference> set = msgs.getAll(f);
        msgs.removeAll(set, cleanupReason);
        Iterator<PacketReference> itr = set.iterator();
        while (itr.hasNext()) {
            try {
                PacketReference pr = itr.next();
                if (pr.acknowledged(getConsumerUID(), getStoredConsumerUID(), !uid.isUnsafeAck(), true)) {
                    try {

                        DestinationList DL = Globals.getDestinationList();
                        Destination[] ds = DL.getDestination(pr.getPartitionedStore(), pr.getDestinationUID());
                        Destination d = ds[0];
                        d.removeMessage(pr.getSysMessageID(), cleanupReason);

                    } finally {
                        pr.postAcknowledgedRemoval();
                    }
                }
            } catch (IOException ex) {
                logger.logStack(Logger.WARNING, "Problem purging consumer " + this, ex);
            }
        }

    }

    public void activate() {
        active = true;
        checkState(null);
    }

    public void deactive() {
        active = false;
        checkState(null);
    }

    @Override
    public void pause(String reason) {
        synchronized (msgs) {
            paused = true;
            pauseCnt++;
            if (DEBUG) {
                logger.log(logger.DEBUG, "Pausing consumer " + this + "[" + pauseCnt + "] " + reason);
            }
        }
        checkState(null);
    }

    @Override
    public void resume(String reason) {
        synchronized (msgs) {
            pauseCnt--;
            if (pauseCnt <= 0) {
                paused = false;
            }
            if (DEBUG) {
                logger.log(logger.DEBUG, "Resuming consumer " + this + "[" + pauseCnt + "] " + reason);
            }
        }
        checkState(null);
    }

    public void setFalconRemote(boolean notlocal) {
        isSpecialRemote = notlocal;
    }

    public boolean isFalconRemote() {
        return isSpecialRemote;
    }

    // not used
    HashSet remotePendingDelivered = new HashSet();

    transient private ArrayList remotePendingResumes = new ArrayList();
    transient private Hashtable lastDestMetrics = new Hashtable();

    // return 0, yes; 1 no previous sampling, else no
    public int checkIfMsgsInRateGTOutRate(Destination d) {

        Subscription sub = getSubscription();
        if (!DestinationList.CHECK_MSGS_RATE_FOR_ALL && !(sub != null && sub.getShared() && !sub.isDurable())) {
            return 2;
        }
        if (DestinationList.CHECK_MSGS_RATE_AT_DEST_CAPACITY_RATIO < 0) {
            return 2;
        }
        float pc = Math.max(Globals.getDestinationList().totalCountPercent(), d.destMessagesSizePercent());
        if (pc < DestinationList.CHECK_MSGS_RATE_AT_DEST_CAPACITY_RATIO) {
            return 2;
        }
        synchronized (lastDestMetrics) {
            DestinationUID did = d.getDestinationUID();
            long[] holder = (long[]) lastDestMetrics.get(did);
            if (holder == null) {
                holder = new long[6];
                d.checkIfMsgsInRateGTOutRate(holder, true);
                lastDestMetrics.put(did, holder);
                return 1;
            }
            return d.checkIfMsgsInRateGTOutRate(holder, false);
        }
    }

    public long getMsgOutTimeMillis(Destination d) {
        synchronized (lastDestMetrics) {
            DestinationUID did = d.getDestinationUID();
            long[] holder = (long[]) lastDestMetrics.get(did);
            if (holder == null) {
                holder = new long[6];
                d.checkIfMsgsInRateGTOutRate(holder, true);
                lastDestMetrics.put(did, holder);
                return -1;
            }
            d.checkIfMsgsInRateGTOutRate(holder, false);
            return holder[5];
        }
    }

    /**
     * resume flow not changing flow control from remote broker
     */
    public void resumeFlow() {

        // deal w/ remote flow control
        synchronized (remotePendingResumes) {
            if (!remotePendingResumes.isEmpty()) {
                Iterator itr = remotePendingResumes.iterator();
                while (itr.hasNext()) {
                    PacketReference ref = (PacketReference) itr.next();
                    // DELIVERED translated to resume flow on remote client
                    try {
                        Globals.getClusterBroadcast().acknowledgeMessage(ref.getBrokerAddress(), ref.getSysMessageID(), uid, ClusterBroadcast.MSG_DELIVERED,
                                null, false);
                    } catch (BrokerException ex) {
                        logger.log(Logger.DEBUG, "Can not send DELIVERED ack " + " received ", ex);
                    }
                    itr.remove();
                }
            }
        }
        if (flowPaused) {
            resumeFlowCnt++;
            flowCount = 0;
            flowPaused = false;
            checkState(null);
        }
    }

    private void resumeRemoteFlow(int id) {
        synchronized (remotePendingResumes) {
            if (!remotePendingResumes.isEmpty()) {
                boolean emptyp = (parentListMap.size() == 0 || isParentListEmpty(parentListMap));
                int remoteSize = remotePendingResumes.size();

                // estimate remote prefetch
                int prefetchVal = id;
                if (id > 0) {
                    if (prefetchVal != 1) {
                        prefetchVal = id / (remoteSize + (emptyp ? 0 : 1));
                        if (prefetchVal == 0) {
                            prefetchVal = 1;
                        }
                    }
                }
                int myprefetch = prefetchVal;
                int totalPrefetched = 0;
                BrokerAddress addr = null;
                ArrayList addrs = new ArrayList();
                Destination[] ds = null;
                Destination d = null;
                PacketReference ref = null;
                HashMap props = null;
                long systemrm, destrm, room;
                DestinationList DL = Globals.getDestinationList();
                Iterator itr = remotePendingResumes.iterator();
                while (itr.hasNext()) {
                    ref = (PacketReference) itr.next();
                    addr = ref.getBrokerAddress();
                    if (addrs.contains(addr)) {
                        itr.remove();
                        continue;
                    }
                    myprefetch = prefetchVal;
                    destrm = room = -1L;
                    props = new HashMap();
                    ds = DL.findDestination(ref.getPartitionedStore(), ref.getDestinationUID());
                    d = ds[0];
                    try {
                        systemrm = DL.checkSystemLimit(ref);
                    } catch (Throwable t) {
                        systemrm = 0;
                    }
                    if (d != null) {
                        destrm = d.checkDestinationCapacity(ref);
                    }
                    if (systemrm >= 0 && destrm >= 0) {
                        room = Math.min(systemrm, destrm);
                    } else if (systemrm >= 0) {
                        room = systemrm;
                    } else {
                        room = destrm;
                    }
                    if (room == 0) {
                        room = 1;
                    }
                    myprefetch = prefetchVal;
                    if (room > 0) {
                        myprefetch = (int) (room - totalPrefetched);
                        if (myprefetch <= 0) {
                            myprefetch = 1;
                        } else {
                            int ret = checkIfMsgsInRateGTOutRate(d);
                            if (ret == 0) {
                                myprefetch = 1;
                            } else if (ret == 1) {
                                myprefetch = 1;
                            }
                        }
                        if (prefetchVal > 0) {
                            myprefetch = Math.min(prefetchVal, myprefetch);
                            if (myprefetch <= 0) {
                                myprefetch = 1;
                            }
                        }
                    }
                    // DELIVERED translated to resume flow on remote client
                    try {
                        props.put(Consumer.PREFETCH, Integer.valueOf(myprefetch));
                        Globals.getClusterBroadcast().acknowledgeMessage(addr, ref.getSysMessageID(), uid, ClusterBroadcast.MSG_DELIVERED, props, false);
                        if (addr != null) {
                            addrs.add(addr);
                        }
                        totalPrefetched += myprefetch;
                        itr.remove();
                    } catch (BrokerException ex) {
                        logger.log(Logger.DEBUG, "Can not send DELIVERED ack " + " received ", ex);
                    }
                }
            }
        }
    }

    @Override
    public void resumeFlow(int id) {
        resumeRemoteFlow(id);
        setPrefetch(id);
        if (flowPaused) {
            resumeFlowCnt++;
            flowCount = 0;
            flowPaused = false;
            checkState(null);
        }
    }

    public boolean isActive() {
        return active;
    }

    public boolean isPaused() {
        return paused;
    }

    public String getSelectorStr() {
        return selstr;
    }

    public Selector getSelector() {
        return selector;
    }

    public boolean getNoLocal() {
        return noLocal;
    }

    /**
     * Request notification when the specific event occurs.
     *
     * @param listener object to notify when the event occurs
     * @param type event which must occur for notification
     * @param userData optional data queued with the notification
     * @return an id associated with this notification
     * @throws UnsupportedOperationException if the broadcaster does not publish the event type passed in
     */
    @Override
    public Object addEventListener(EventListener listener, EventType type, Object userData) throws UnsupportedOperationException {

        if (type != EventType.BUSY_STATE_CHANGED) {
            throw new UnsupportedOperationException("Only " + "Busy State Changed notifications supported on this class");
        }
        return evb.addEventListener(listener, type, userData);
    }

    /**
     * Request notification when the specific event occurs AND the reason matched the passed in reason.
     *
     * @param listener object to notify when the event occurs
     * @param type event which must occur for notification
     * @param userData optional data queued with the notification
     * @param reason reason which must be associated with the event (or null for all events)
     * @return an id associated with this notification
     * @throws UnsupportedOperationException if the broadcaster does not support the event type or reason passed in
     */
    @Override
    public Object addEventListener(EventListener listener, EventType type, Reason reason, Object userData) throws UnsupportedOperationException {
        if (type != EventType.BUSY_STATE_CHANGED) {
            throw new UnsupportedOperationException("Only " + "Busy State Changed notifications supported on this class");
        }
        return evb.addEventListener(listener, type, reason, userData);
    }

    /**
     * remove the listener registered with the passed in id.
     *
     * @return the listener callback which was removed
     */
    @Override
    public Object removeEventListener(Object id) {
        return evb.removeEventListener(id);
    }

    private void notifyChange(EventType type, Reason r, Object target, Object oldval, Object newval) {
        evb.notifyChange(type, r, target, oldval, newval);
    }

    @Override
    public void dump(String prefix) {
        if (prefix == null) {
            prefix = "";
        }
        logger.log(Logger.INFO, prefix + "Consumer: " + uid + " [paused, active," + "flowPaused, parentBusy, hasMessages, parentSize ] = [" + paused + ","
                + active + "," + flowPaused + "," + getParentBusy() + "," + (msgs == null || !msgs.isEmpty()) + "," + parentListMap + "]");
        logger.log(Logger.INFO, prefix + "Busy state [" + uid + "] is " + busy);
        if (msgs == null) {
            logger.log(Logger.INFO, "msgs is null");
        } else {
            logger.log(Logger.INFO, msgs.toDebugString());
        }
    }

    public static Hashtable getAllDebugState() {
        Hashtable ht = new Hashtable();
        ht.put("FlowControlAllowed", String.valueOf(C_FLOW_CONTROL_ALLOWED));
        ht.put("ConsumerCnt", String.valueOf(consumers.size()));
        Iterator itr = getAllConsumers();
        while (itr.hasNext()) {
            Consumer c = (Consumer) itr.next();
            ht.put("Consumer[" + c.getConsumerUID().longValue() + "]", c.getDebugState());
        }
        return ht;
    }

    public Hashtable getDebugState() {
        Hashtable ht = new Hashtable();
        ht.put("ConsumerUID", String.valueOf(uid.longValue()));
        ht.put("Broker", (uid.getBrokerAddress() == null ? "NONE" : uid.getBrokerAddress().toString()));
        ht.put("msgsToConsumer", String.valueOf(msgsToConsumer));
        ht.put("StoredConsumerUID", String.valueOf(getStoredConsumerUID().longValue()));
        ht.put("ConnectionUID", (conuid == null ? "none" : String.valueOf(conuid.longValue())));
        ht.put("type", "CONSUMER");
        ht.put("valid", String.valueOf(valid));
        ht.put("paused", String.valueOf(paused));
        ht.put("pauseCnt", String.valueOf(pauseCnt));
        ht.put("noLocal", String.valueOf(noLocal));
        ht.put("destinationUID", dest.toString());
        ht.put("busy", String.valueOf(busy));
        if (parent != null) {
            ht.put("Subscription", String.valueOf(parent.getConsumerUID().longValue()));
        }
        ht.put("isSpecialRemote", String.valueOf(isSpecialRemote));
        ht.put("ackMsgsOnDestroy", String.valueOf(ackMsgsOnDestroy));
        ht.put("position", String.valueOf(position));
        ht.put("active", String.valueOf(active));
        ht.put("flowCount", String.valueOf(flowCount));
        ht.put("flowPaused", String.valueOf(flowPaused));
        ht.put("pauseFlowCnt", String.valueOf(pauseFlowCnt));
        ht.put("resumeFlowCnt", String.valueOf(resumeFlowCnt));
        ht.put("useConsumerFlowControl", String.valueOf(useConsumerFlowControl));
        ht.put("selstr", (selstr == null ? "none" : selstr));
        ht.put("parentListMap", parentListMap.toString());
        ht.put("plistenerMap", plistenerMap.toString());
        ht.put("isParentListEmpty", Boolean.valueOf(isParentListEmpty(parentListMap)));
        if (DestinationList.DEBUG_LISTS) {
            Hashtable h = new Hashtable();
            synchronized (parentListMap) {
                for (Map.Entry<PartitionedStore, SubSet> pair : parentListMap.entrySet()) {
                    h.put(pair.getKey().toString(), pair.getValue().toDebugString());
                }
            }
            ht.put("ParentListMap(detail)", h);
        }
        ht.put("prefetch", String.valueOf(prefetch));
        ht.put("remotePrefetch", String.valueOf(remotePrefetch));
        ht.put("parentBusy", String.valueOf(getParentBusy()));
        ht.put("hasMessages", String.valueOf(!msgs.isEmpty()));
        ht.put("msgsSize", String.valueOf(msgs.size()));
        if (DestinationList.DEBUG_LISTS) {
            ht.put("msgs", msgs.toDebugString());
        }
        ht.put("isFailover", String.valueOf(isFailover));
        ht.put("localConsumerCreationReady", String.valueOf(localConsumerCreationReady));
        Vector v1 = new Vector();
        ArrayList vals = null;
        synchronized (remotePendingResumes) {
            vals = new ArrayList(remotePendingResumes);
        }
        Iterator itr = vals.iterator();
        while (itr.hasNext()) {
            PacketReference ref = (PacketReference) itr.next();
            String val = ref.getBrokerAddress() + ": " + ref;
            v1.add(val);
        }
        ht.put("remotePendingResumes", v1);
        Vector v2 = new Vector();
        synchronized (lastDestMetrics) {
            itr = lastDestMetrics.keySet().iterator();
            while (itr.hasNext()) {
                DestinationUID did = (DestinationUID) itr.next();
                long[] holder = (long[]) lastDestMetrics.get(did);
                String val = did + ": " + "ins=" + holder[0] + "|outs=" + holder[1] + "|time=" + holder[2] + "|inr=" + holder[3] + "|outr=" + holder[4]
                        + "|outt=" + holder[5];
                v2.add(val);
            }
        }
        ht.put("lastDestMetrics", v2);
        return ht;
    }

    public Vector<String> getDebugMessages(boolean full) {
        Vector<String> ht = new Vector<>();
        synchronized (msgs) {
            Iterator<PacketReference> itr = msgs.iterator();
            while (itr.hasNext()) {
                PacketReference pr = itr.next();
                ht.add((full ? pr.getPacket().dumpPacketString() : pr.getPacket().toString()));
            }
        }
        return ht;

    }

    private void checkState(Reason r) {
        // XXX - LKS look into adding an assert that a lock
        // must be held when this is called
        boolean isbusy = false;
        boolean notify = false;
        synchronized (msgs) {
            isbusy = !paused && active && !flowPaused && ((getParentBusy() && !isFailover) || !msgs.isEmpty());
            notify = isbusy != busy;
            busy = isbusy;
        }
        if (notify) {
            notifyChange(EventType.BUSY_STATE_CHANGED, r, this, Boolean.valueOf(!isbusy), Boolean.valueOf(isbusy));
        }
    }

    /**
     * Return a concises string representation of the object.
     *
     * @return a string representation of the object.
     */
    @Override
    public String toString() {
        String str = "Consumer - " + dest + ":" + "[" + getConsumerUID() + ", " + getStoredConsumerUID() + "]";
        return str;
    }

    @Override
    public void debug(String prefix) {
        if (prefix == null) {
            prefix = "";
        }
        logger.log(Logger.INFO, prefix + toString());
        String follow = prefix + "\t";
        logger.log(Logger.INFO, follow + "Selector = " + selector);
        logger.log(Logger.INFO, follow + "msgs = " + msgs.size());
        logger.log(Logger.INFO, follow + "parentListMap = " + parentListMap);
        logger.log(Logger.INFO, follow + "parent = " + parent);
        logger.log(Logger.INFO, follow + "valid = " + valid);
        logger.log(Logger.INFO, follow + "active = " + active);
        logger.log(Logger.INFO, follow + "paused = " + paused);
        logger.log(Logger.INFO, follow + "pauseCnt = " + pauseCnt);
        logger.log(Logger.INFO, follow + "noLocal = " + noLocal);
        logger.log(Logger.INFO, follow + "busy = " + busy);
        logger.log(Logger.INFO, follow + "flowPaused = " + flowPaused);
        logger.log(Logger.INFO, follow + "prefetch = " + prefetch);
        logger.log(Logger.INFO, follow + msgs.toDebugString());
    }

    public void setCapacity(int size) {
        msgs.setCapacity(size);
    }

    public void setByteCapacity(long size) {
        msgs.setByteCapacity(size);
    }

    public int capacity() {
        return msgs.capacity();
    }

    public long byteCapacity() {
        return msgs.byteCapacity();
    }

    private static Map consumers = Collections.synchronizedMap(new HashMap());

    protected static final Set wildcardConsumers = Collections.synchronizedSet(new HashSet());

    public static void clearAllConsumers() {
        consumers.clear();
        wildcardConsumers.clear();
    }

    public static Iterator getAllConsumers() {
        return getAllConsumers(true);
    }

    public static Iterator getAllConsumers(boolean all) {
        synchronized (consumers) {
            HashSet cs = new HashSet(consumers.values());
            if (all) {
                return cs.iterator();
            }
            Consumer co = null;
            Iterator itr = cs.iterator();
            while (itr.hasNext()) {
                co = (Consumer) itr.next();
                if (co instanceof Subscription) {
                    continue;
                }
                if (!co.isLocalConsumerCreationReady()) {
                    itr.remove();
                }
            }
            return cs.iterator();
        }
    }

    public static Iterator getWildcardConsumers() {
        synchronized (consumers) {
            return (new HashSet(wildcardConsumers)).iterator();
        }
    }

    public static int getNumConsumers() {
        return (consumers.size());
    }

    public static int getNumWildcardConsumers() {
        return wildcardConsumers.size();
    }

    public static Consumer getConsumer(ConsumerUID uid) {
        synchronized (consumers) {
            Consumer c = (Consumer) consumers.get(uid);
            return c;
        }
    }

    public static Consumer getConsumer(String creator) {
        if (creator == null) {
            return null;
        }

        synchronized (consumers) {
            Iterator itr = consumers.values().iterator();
            while (itr.hasNext()) {
                Consumer c = (Consumer) itr.next();
                if (creator.equals(c.getCreator())) {
                    return c;
                }
            }
        }
        return null;
    }

    public void setLockPosition(int position) {
        lockPosition = position;
    }

    public int getLockPosition() {
        return lockPosition;
    }

    public void recreationRequested() {
        requestedRecreation = true;
    }

    protected boolean tobeRecreated() {
        return requestedRecreation;
    }
}
