/*
 * Copyright (c) 2000, 2017 Oracle and/or its affiliates. All rights reserved.
 *
 * 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
 */

package com.sun.messaging.jmq.jmsclient;

import java.io.PrintStream;
import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Logger;
import java.util.logging.Level;

import javax.jms.BytesMessage;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.ConnectionMetaData;
import javax.jms.Destination;
import javax.jms.ExceptionListener;
import javax.jms.IllegalStateException;
import javax.jms.IllegalStateRuntimeException;
import javax.jms.InvalidClientIDRuntimeException;
import javax.jms.InvalidDestinationException;
import javax.jms.InvalidSelectorException;
import javax.jms.JMSConsumer;
import javax.jms.JMSContext;
import javax.jms.JMSException;
import javax.jms.JMSProducer;
import javax.jms.JMSRuntimeException;
import javax.jms.JMSSecurityException;
import javax.jms.JMSSecurityRuntimeException;
import javax.jms.MapMessage;
import javax.jms.Message;
import javax.jms.MessageProducer;
import javax.jms.ObjectMessage;
import javax.jms.Queue;
import javax.jms.QueueBrowser;
import javax.jms.Session;
import javax.jms.StreamMessage;
import javax.jms.TemporaryQueue;
import javax.jms.TemporaryTopic;
import javax.jms.TextMessage;
import javax.jms.Topic;
import javax.jms.TransactionInProgressException;
import javax.jms.TransactionRolledBackException;
import javax.jms.XAConnection;
import javax.jms.XAConnectionFactory;

import com.sun.messaging.AdministeredObject;
import com.sun.messaging.jmq.jmsclient.resources.ClientResources;
import com.sun.messaging.jms.MQIllegalStateRuntimeException;
import com.sun.messaging.jms.MQInvalidDestinationRuntimeException;
import com.sun.messaging.jms.MQInvalidSelectorRuntimeException;
import com.sun.messaging.jms.MQRuntimeException;
import com.sun.messaging.jms.MQSecurityRuntimeException;
import com.sun.messaging.jms.MQTransactionInProgressRuntimeException;
import com.sun.messaging.jms.MQTransactionRolledBackRuntimeException;

public class JMSContextImpl implements JMSContext, Traceable {
    private static final String ROOT_LOGGER_NAME = "javax.jms";
    protected static final String JMSCONTEXT_LOGGER_NAME = ROOT_LOGGER_NAME + ".jmscontext";

    protected static final Logger contextLogger = Logger.getLogger(JMSCONTEXT_LOGGER_NAME, ClientResources.CLIENT_RESOURCE_BUNDLE_NAME);

    Connection connection;
    Session session;
    MessageProducer messageProducer;
    boolean autoStart = true;
    boolean closed = false;

    // Set shared by all the JMSContext objects using the same Connection as this JMSContext
    // which contains all the JMSContext objects using the same Connection as this JMSContext
    Set<JMSContext> contextSet;

    Set<JMSConsumer> consumers = new HashSet<JMSConsumer>();

    ContainerType containerType;

    protected ContainerType getContainerType() {
        return containerType;
    }

    /**
     * Flag that determines whether calling setClientID is allowed
     */
    private boolean allowToSetClientID = true;

    public JMSContextImpl(ConnectionFactory connectionFactory, ContainerType containerType, String userName, String password) {
        contextLogger.log(Level.FINE, "JMSContext@" + this.hashCode() + "(cf@" + connectionFactory.hashCode() + ", " + containerType + ", " + userName + ",)");
        this.containerType = containerType;

        // create connection
        try {
            connection = connectionFactory.createConnection(userName, password);
        } catch (SecurityException e) {
            JMSSecurityRuntimeException jsre = new com.sun.messaging.jms.MQSecurityRuntimeException(e.getMessage(), null, e);
            ExceptionHandler.throwJMSRuntimeException(jsre);
        } catch (JMSSecurityException e) {
            throw new MQSecurityRuntimeException(e);
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
        // create session
        try {
            session = connection.createSession();
        } catch (JMSException e) {
            try {
                connection.close();
            } catch (JMSException e1) {
            }
            throw new MQRuntimeException(e);
        }
        initializeForNewConnection();
    }

    public JMSContextImpl(ConnectionFactory connectionFactory, ContainerType containerType) {
        contextLogger.log(Level.FINE, "JMSContext@" + this.hashCode() + "(cf@" + connectionFactory.hashCode() + ", " + containerType + ")");
        this.containerType = containerType;

        // create connection
        try {
            connection = connectionFactory.createConnection();
        } catch (SecurityException e) {
            JMSSecurityRuntimeException jsre = new com.sun.messaging.jms.MQSecurityRuntimeException(e.getMessage(), null, e);
            ExceptionHandler.throwJMSRuntimeException(jsre);
        } catch (JMSSecurityException e) {
            throw new MQSecurityRuntimeException(e);
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
        // create session
        try {
            session = connection.createSession();
        } catch (JMSException e) {
            try {
                connection.close();
            } catch (JMSException e1) {
            }
            throw new MQRuntimeException(e);
        }
        initializeForNewConnection();
    }

    public JMSContextImpl(ConnectionFactory connectionFactory, ContainerType containerType, String userName, String password, int sessionMode) {
        contextLogger.log(Level.FINE,
                "JMSContext@" + this.hashCode() + "(cf@" + connectionFactory.hashCode() + ", " + containerType + ", " + userName + ",, " + sessionMode + ")");
        validateSessionMode(sessionMode);
        this.containerType = containerType;

        // create connection
        try {
            connection = connectionFactory.createConnection(userName, password);
        } catch (SecurityException e) {
            JMSSecurityRuntimeException jmssre = new JMSSecurityRuntimeException(e.getMessage(), null, e);
            throw jmssre;
        } catch (JMSSecurityException e) {
            throw new MQSecurityRuntimeException(e);
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
        // create session
        try {
            session = connection.createSession(sessionMode);
        } catch (JMSException e) {
            try {
                connection.close();
            } catch (JMSException e1) {
            }
            throw new MQRuntimeException(e);
        }
        initializeForNewConnection();
    }

    public JMSContextImpl(ConnectionFactory connectionFactory, ContainerType containerType, int sessionMode) {
        contextLogger.log(Level.FINE,
                "JMSContext@" + this.hashCode() + "(cf@" + connectionFactory.hashCode() + ", " + containerType + ", " + sessionMode + ")");
        validateSessionMode(sessionMode);
        this.containerType = containerType;

        // create connection
        try {
            connection = connectionFactory.createConnection();
        } catch (SecurityException e) {
            throw new JMSSecurityRuntimeException(e.getMessage(), null, e);
        } catch (JMSSecurityException e) {
            throw new MQSecurityRuntimeException(e);
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
        // create session
        try {
            session = connection.createSession(sessionMode);
        } catch (JMSException e) {
            try {
                connection.close();
            } catch (JMSException e1) {
            }
            throw new MQRuntimeException(e);
        }
        initializeForNewConnection();
    }

    /**
     * Create a new JMSContextImpl using an existing Connection
     *
     * @param containerType
     * @param connection
     * @param sessionMode
     */
    public JMSContextImpl(ContainerType containerType, Set<JMSContext> contextSet, Connection connection, int sessionMode) {
        contextLogger.log(Level.FINE, "JMSContext@" + this.hashCode() + "(" + containerType + ", contextSet@" + contextSet.hashCode() + ", connection@"
                + connection.hashCode() + ", " + sessionMode + ")");
        validateSessionMode(sessionMode);
        this.containerType = containerType;

        // use the specified connection
        this.connection = connection;
        // create session
        try {
            session = connection.createSession(sessionMode);
        } catch (JMSException e) {
            try {
                connection.close();
            } catch (JMSException e1) {
            }
            throw new MQRuntimeException(e);
        }
        initializeForExistingConnection(contextSet);
    }

    public JMSContextImpl(XAConnectionFactory xaConnectionFactory, ContainerType containerType, String userName, String password) {
        contextLogger.log(Level.FINE,
                "JMSContext@" + this.hashCode() + "(xacf@" + xaConnectionFactory.hashCode() + ", " + containerType + ", " + userName + ",)");
        this.containerType = containerType;
        // create XA connection
        try {
            connection = xaConnectionFactory.createXAConnection(userName, password);
        } catch (SecurityException e) {
            JMSSecurityRuntimeException jsre = new com.sun.messaging.jms.MQSecurityRuntimeException(e.getMessage(), null, e);
            ExceptionHandler.throwJMSRuntimeException(jsre);
        } catch (JMSSecurityException e) {
            throw new MQSecurityRuntimeException(e);
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
        // create XA session
        try {
            session = ((XAConnection) connection).createXASession();
        } catch (JMSException e) {
            try {
                connection.close();
            } catch (JMSException e1) {
            }
            throw new MQRuntimeException(e);
        }
        initializeForNewConnection();
    }

    public JMSContextImpl(XAConnectionFactory xaConnectionFactory, ContainerType containerType) {
        contextLogger.log(Level.FINE, "JMSContext@" + this.hashCode() + "(xacf@" + xaConnectionFactory.hashCode() + ", " + containerType + ")");
        this.containerType = containerType;
        // create XA connection
        try {
            connection = xaConnectionFactory.createXAConnection();
        } catch (SecurityException e) {
            JMSSecurityRuntimeException jsre = new com.sun.messaging.jms.MQSecurityRuntimeException(e.getMessage(), null, e);
            ExceptionHandler.throwJMSRuntimeException(jsre);
        } catch (JMSSecurityException e) {
            throw new MQSecurityRuntimeException(e);
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
        // create XA session
        try {
            session = ((XAConnection) connection).createXASession();
        } catch (JMSException e) {
            try {
                connection.close();
            } catch (JMSException e1) {
            }
            throw new MQRuntimeException(e);
        }
        initializeForNewConnection();
    }

    public JMSContextImpl() {
        contextLogger.fine("JMSContext@" + this.hashCode() + "()");
    }

    private void validateSessionMode(int sessionMode) {
        if (sessionMode != JMSContext.AUTO_ACKNOWLEDGE && sessionMode != JMSContext.CLIENT_ACKNOWLEDGE && sessionMode != JMSContext.DUPS_OK_ACKNOWLEDGE
                && sessionMode != JMSContext.SESSION_TRANSACTED) {
            // "Invalid session mode {0}"
            String errorString = AdministeredObject.cr.getKString(ClientResources.X_INVALID_SESSION_MODE, sessionMode);
            JMSRuntimeException jmsre = new com.sun.messaging.jms.MQRuntimeException(errorString, ClientResources.X_INVALID_SESSION_MODE);
            ExceptionHandler.throwJMSRuntimeException(jmsre);
        }
    }

    /**
     * Initialize a newly-created JMSContext that has created a new Connection
     */
    protected void initializeForNewConnection() {
        contextSet = new HashSet<JMSContext>();
        contextSet.add(this);
        contextLogger.log(Level.FINE, "JMSContext@" + this.hashCode() + ".initializeForNewConnection(): connection@" + connection.hashCode() + ", session@"
                + session.hashCode() + ", contextSet@" + contextSet.hashCode() + "(" + contextSet.size() + ")");
    }

    /**
     * Initialize a newly-created JMSContext that we have created from an existing JMSContext
     */
    private void initializeForExistingConnection(Set<JMSContext> existingContextSet) {
        int size = 0;
        int hashcode = 0;
        synchronized (existingContextSet) {
            size = existingContextSet.size();
            hashcode = existingContextSet.hashCode();
            contextSet = existingContextSet;
            contextSet.add(this);
        }
        contextLogger.log(Level.FINE, "JMSContext@" + this.hashCode() + ".initializeForExistingConnection(): connection@" + connection.hashCode() + ", session@"
                + session.hashCode() + ", contextSet@" + hashcode + "(" + size + ")");
    }

    @Override
    public void dump(PrintStream ps) {
        ps.println("------ JMSContextImpl dump start ------");
        ps.println("autoStart=" + autoStart);
        ps.println("closed=" + closed);
        ps.println("containerType=" + containerType);
        ps.println("contextSet contains " + contextSet.size() + " JMSContexts");
        ps.println("Here is the Connection:");
        if (connection instanceof Traceable) {
            ((Traceable) connection).dump(ps);
        }
        ps.println("Here is the Session:");
        if (session instanceof Traceable) {
            ((Traceable) session).dump(ps);
        }
        ps.println("Here is the MessageProducer:");
        if (messageProducer instanceof Traceable) {
            ((Traceable) messageProducer).dump(ps);
        }
        ps.println("------ JMSContextImpl dump end ------");
    }

    @Override
    public JMSContext createContext(int sessionMode) {
        // this method is not permitted in the Java EE web or EJB containers
        if (containerType == ContainerType.JavaEE_Web_or_EJB) {
            // "This method may not be called in a Java EE web or EJB container"
            String errorString = AdministeredObject.cr.getKString(ClientResources.X_FORBIDDEN_IN_JAVAEE_WEB_EJB);
            throw new MQRuntimeException(errorString);
        }
        checkNotClosed();
        disallowSetClientID();
        return new JMSContextImpl(containerType, contextSet, connection, sessionMode);
    }

    @Override
    public JMSProducer createProducer() {
        checkNotClosed();
        disallowSetClientID();
        return new JMSProducerImpl(this);
    }

    @Override
    public String getClientID() {
        checkNotClosed();
        try {
            return connection.getClientID();
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public void setClientID(String clientID) {
        // this method is not permitted in the Java EE web or EJB containers
        if (containerType == ContainerType.JavaEE_Web_or_EJB) {
            // "This method may not be called in a Java EE web or EJB container"
            String errorString = AdministeredObject.cr.getKString(ClientResources.X_FORBIDDEN_IN_JAVAEE_WEB_EJB);
            JMSRuntimeException jmsre = new com.sun.messaging.jms.MQRuntimeException(errorString, ClientResources.X_FORBIDDEN_IN_JAVAEE_WEB_EJB);
            ExceptionHandler.throwJMSRuntimeException(jmsre);
        }

        // may throw JMSRuntimeException
        checkNotClosed();
        // may throw IllegalStateRuntimeException
        checkSetClientIDAllowed();
        // may throw InvalidClientIDRuntimeException
        checkClientID(clientID);
        if (connection instanceof ContextableConnection) {
            ((ContextableConnection) connection)._setClientIDForContext(clientID);
        } else {
            // for debugging
            throw new RuntimeException("Not yet implemented for " + connection.getClass());
        }

        disallowSetClientID();
    }

    @Override
    public ConnectionMetaData getMetaData() {
        checkNotClosed();

        try {
            return connection.getMetaData();
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public ExceptionListener getExceptionListener() {
        checkNotClosed();

        try {
            return connection.getExceptionListener();
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public void setExceptionListener(ExceptionListener listener) {
        checkNotClosed();
        try {
            connection.setExceptionListener(listener);
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
        disallowSetClientID();
    }

    @Override
    public void start() {
        checkNotClosed();
        disallowSetClientID();
        try {
            connection.start();
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public void stop() {
        checkNotClosed();
        disallowSetClientID();

        try {
            connection.stop();
        } catch (IllegalStateException e) {
            throw new MQIllegalStateRuntimeException(e);
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public void setAutoStart(boolean autoStart) {
        checkNotClosed();
        disallowSetClientID();

        this.autoStart = autoStart;
    }

    @Override
    public boolean getAutoStart() {
        checkNotClosed();

        return autoStart;
    }

    @Override
    public void close() {
        contextLogger.log(Level.FINE, "JMSContext@" + this.hashCode() + ".close(): connection@" + (connection == null ? "null" : connection.hashCode()));
        if (closed) {
            return;
        }
        closed = true;

        // close all JMSConsumer objects associated with this JMSContext
        for (JMSConsumer consumer : consumers) {
            consumer.close();
        }
        if (!consumers.isEmpty()) {
            throw new RuntimeException("Debug: consumers not empty");
        }

        // close the anonymous MessageProducer associated with this JMSContext
        if (messageProducer != null) {
            try {
                messageProducer.close();
                messageProducer = null;
            } catch (IllegalStateException e) {
                throw new MQIllegalStateRuntimeException(e);
            } catch (JMSException e) {
                throw new MQRuntimeException(e);
            }
        }

        // close the Session
        try {
            session.close();
        } catch (IllegalStateException e) {
            throw new MQIllegalStateRuntimeException(e);
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }

        // if this is the only JMSContext using the connection, close it
        synchronized (contextSet) {
            // debug
            if (!contextSet.contains(this)) {
                throw new RuntimeException("I am not in the context set");
            }
            contextSet.remove(this);
            if (contextSet.contains(this)) {
                throw new RuntimeException("I am not in the context set");
            }

            if (contextSet.isEmpty()) {
                try {
                    connection.close();
                } catch (IllegalStateException e) {
                    throw new MQIllegalStateRuntimeException(e);
                } catch (JMSException e) {
                    throw new MQRuntimeException(e);
                }
            }
        }

        closed = true;
    }

    @Override
    public BytesMessage createBytesMessage() {
        checkNotClosed();
        disallowSetClientID();

        try {
            return session.createBytesMessage();
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public MapMessage createMapMessage() {
        checkNotClosed();
        disallowSetClientID();

        try {
            return session.createMapMessage();
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public Message createMessage() {
        checkNotClosed();
        disallowSetClientID();

        try {
            return session.createMessage();
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public ObjectMessage createObjectMessage() {
        checkNotClosed();
        disallowSetClientID();

        try {
            return session.createObjectMessage();
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public ObjectMessage createObjectMessage(Serializable object) {
        checkNotClosed();
        disallowSetClientID();

        try {
            return session.createObjectMessage(object);
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public StreamMessage createStreamMessage() {
        checkNotClosed();
        disallowSetClientID();

        try {
            return session.createStreamMessage();
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public TextMessage createTextMessage() {
        checkNotClosed();
        disallowSetClientID();

        try {
            return session.createTextMessage();
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public TextMessage createTextMessage(String text) {
        checkNotClosed();
        disallowSetClientID();

        try {
            return session.createTextMessage(text);
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public boolean getTransacted() {
        checkNotClosed();

        try {
            return session.getTransacted();
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public int getSessionMode() {
        checkNotClosed();

        try {
            return session.getAcknowledgeMode();
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public void commit() {
        checkNotClosed();

        disallowSetClientID();

        try {
            session.commit();
        } catch (TransactionRolledBackException e) {
            throw new MQTransactionRolledBackRuntimeException(e);
        } catch (TransactionInProgressException e) {
            throw new MQTransactionInProgressRuntimeException(e);
        } catch (IllegalStateException e) {
            throw new MQIllegalStateRuntimeException(e);
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }

    }

    @Override
    public void rollback() {
        checkNotClosed();
        disallowSetClientID();

        try {
            session.rollback();
        } catch (IllegalStateException e) {
            throw new MQIllegalStateRuntimeException(e);
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public void recover() {
        checkNotClosed();
        disallowSetClientID();

        try {
            session.recover();
        } catch (IllegalStateException e) {
            throw new MQIllegalStateRuntimeException(e);
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public JMSConsumer createConsumer(Destination destination) {
        checkNotClosed();
        disallowSetClientID();
        JMSConsumerImpl consumer = new JMSConsumerImpl();
        consumer.initialiseConsumer(this, destination);
        addConsumer(consumer);
        return consumer;
    }

    @Override
    public JMSConsumer createConsumer(Destination destination, String messageSelector) {
        checkNotClosed();
        disallowSetClientID();
        JMSConsumerImpl consumer = new JMSConsumerImpl();
        consumer.initialiseConsumer(this, destination, messageSelector);
        addConsumer(consumer);
        return consumer;
    }

    @Override
    public JMSConsumer createConsumer(Destination destination, String messageSelector, boolean noLocal) {
        checkNotClosed();
        disallowSetClientID();
        JMSConsumerImpl consumer = new JMSConsumerImpl();
        consumer.initialiseConsumer(this, destination, messageSelector, noLocal);
        addConsumer(consumer);
        return consumer;
    }

    @Override
    public Queue createQueue(String queueName) {
        checkNotClosed();
        disallowSetClientID();

        try {
            return session.createQueue(queueName);
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public Topic createTopic(String topicName) {
        checkNotClosed();
        disallowSetClientID();

        try {
            return session.createTopic(topicName);
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public JMSConsumer createDurableConsumer(Topic topic, String name) {
        checkNotClosed();
        disallowSetClientID();
        JMSConsumerImpl consumer = new JMSConsumerImpl();
        consumer.initialiseDurableConsumer(this, topic, name);
        addConsumer(consumer);
        return consumer;
    }

    @Override
    public JMSConsumer createDurableConsumer(Topic topic, String name, String messageSelector, boolean noLocal) {
        checkNotClosed();
        disallowSetClientID();
        JMSConsumerImpl consumer = new JMSConsumerImpl();
        consumer.initialiseDurableConsumer(this, topic, name, messageSelector, noLocal);
        addConsumer(consumer);
        return consumer;
    }

    @Override
    public JMSConsumer createSharedDurableConsumer(Topic topic, String name) {
        checkNotClosed();
        disallowSetClientID();
        JMSConsumerImpl consumer = new JMSConsumerImpl();
        consumer.initialiseSharedDurableConsumer(this, topic, name);
        addConsumer(consumer);
        return consumer;
    }

    @Override
    public JMSConsumer createSharedDurableConsumer(Topic topic, String name, String messageSelector) {
        checkNotClosed();
        disallowSetClientID();
        JMSConsumerImpl consumer = new JMSConsumerImpl();
        consumer.initialiseSharedDurableConsumer(this, topic, name, messageSelector);
        addConsumer(consumer);
        return consumer;
    }

    @Override
    public JMSConsumer createSharedConsumer(Topic topic, String sharedSubscriptionName) {
        checkNotClosed();
        disallowSetClientID();
        JMSConsumerImpl consumer = new JMSConsumerImpl();
        consumer.initialiseSharedConsumer(this, topic, sharedSubscriptionName);
        addConsumer(consumer);
        return consumer;
    }

    @Override
    public JMSConsumer createSharedConsumer(Topic topic, String sharedSubscriptionName, String messageSelector) {
        checkNotClosed();
        disallowSetClientID();
        JMSConsumerImpl consumer = new JMSConsumerImpl();
        consumer.initialiseSharedConsumer(this, topic, sharedSubscriptionName, messageSelector);
        addConsumer(consumer);
        return consumer;
    }

    @Override
    public QueueBrowser createBrowser(Queue queue) {
        checkNotClosed();
        disallowSetClientID();

        try {
            return session.createBrowser(queue);
        } catch (InvalidDestinationException e) {
            throw new MQInvalidDestinationRuntimeException(e);
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public QueueBrowser createBrowser(Queue queue, String messageSelector) {
        checkNotClosed();
        disallowSetClientID();

        try {
            return session.createBrowser(queue, messageSelector);
        } catch (InvalidDestinationException e) {
            throw new MQInvalidDestinationRuntimeException(e);
        } catch (InvalidSelectorException e) {
            throw new MQInvalidSelectorRuntimeException(e);
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public TemporaryQueue createTemporaryQueue() {
        checkNotClosed();
        disallowSetClientID();

        try {
            return session.createTemporaryQueue();
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public TemporaryTopic createTemporaryTopic() {
        try {
            return session.createTemporaryTopic();
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public void unsubscribe(String name) {
        checkNotClosed();

        try {
            session.unsubscribe(name);
        } catch (InvalidDestinationException e) {
            throw new MQInvalidDestinationRuntimeException(e);
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }
    }

    @Override
    public void acknowledge() {
        // check context is not closed
        // don't call checkNotClosed() as that throws the wrong exception
        if (closed) {
            // "JMSContext is closed"
            String errorString = AdministeredObject.cr.getKString(ClientResources.X_JMSCONTEXT_CLOSED);
            throw new IllegalStateRuntimeException(errorString, ClientResources.X_JMSCONTEXT_CLOSED);
        }

        // If the session is transacted or has an acknowledgement mode of
        // AUTO_ACKNOWLEDGE or DUPS_OK_ACKNOWLEDGE calling this method has no
        // effect.
        try {
            if (session.getAcknowledgeMode() != Session.CLIENT_ACKNOWLEDGE) {
                return;
            }
        } catch (JMSException e) {
            throw new MQRuntimeException(e);
        }

        // Note that if a DirectSession is created with Session.CLIENT_ACKNOWLEDGE
        // then the sessionMode will have been overridden to Session.AUTO_ACKNOWLEDGE,
        // so the preceding code should have caused this method to exit

        disallowSetClientID();

        if (session instanceof ContextableSession) {
            try {
                ((ContextableSession) session).clientAcknowledge();
            } catch (IllegalStateException e) {
                throw new MQIllegalStateRuntimeException(e);
            } catch (JMSException e) {
                throw new MQRuntimeException(e);
            }
        } else {
            // shouldn't happen
            throw new IllegalStateRuntimeException("Session implementation " + session.getClass() + " not yet supported");
        }
    }

    private void addConsumer(JMSConsumer consumer) {
        consumers.add(consumer);
    }

    protected void removeConsumer(JMSConsumer consumer) {
        consumers.remove(consumer);
    }

    /**
     * Check that setClientID is allowed to be called. If it isn't, log and throw a IllegalStateRuntimeException.
     */
    private void checkSetClientIDAllowed() {
        boolean throwex = false;
        JMSException ex = null;
        try {
            if (allowToSetClientID == false || connection.getClientID() != null) {
                throwex = true;
            }
        } catch (JMSException e) {
            ex = e;
        }
        if (throwex || ex != null) {
            String errorString = AdministeredObject.cr.getKString(ClientResources.X_SET_CLIENT_ID);
            IllegalStateRuntimeException isre = new javax.jms.IllegalStateRuntimeException(errorString, ClientResources.X_SET_CLIENT_ID, ex);
            ExceptionHandler.throwJMSRuntimeException(isre);
        }
    }

    /**
     * Check that the specified clientID is not null or an empty string. If it is, log and throw a
     * InvalidClientIDRuntimeException.
     */
    protected void checkClientID(String clientID) {
        if (clientID == null || (clientID.trim().length() == 0)) {
            String errorString = AdministeredObject.cr.getKString(ClientResources.X_INVALID_CLIENT_ID, "\"\"");
            InvalidClientIDRuntimeException jmse = new javax.jms.InvalidClientIDRuntimeException(errorString, ClientResources.X_INVALID_CLIENT_ID);
            ExceptionHandler.throwJMSRuntimeException(jmse);
        }
    }

    /**
     * Disallow the use of setClientID by applications
     */
    protected void disallowSetClientID() {
        allowToSetClientID = false;
    }

    /**
     * return the anonymous MessageProducer associated with this JMSContext
     *
     * @return the anonymous MessageProducer associated with this JMSContext
     */
    protected MessageProducer getMessageProducer() {
        if (messageProducer == null) {
            try {
                messageProducer = session.createProducer(null);
            } catch (JMSException e) {
                throw new MQRuntimeException(e);
            }
        }
        return messageProducer;
    }

    /**
     * If the context is closed, throw a JMSRuntimeException
     */
    protected void checkNotClosed() {

        if (closed) {
            // "JMSContext is closed"
            String errorString = AdministeredObject.cr.getKString(ClientResources.X_JMSCONTEXT_CLOSED);
            throw new MQRuntimeException(errorString, ClientResources.X_JMSCONTEXT_CLOSED);
        }
    }

    protected Session _getSession() {
        return session;
    }

    public Connection _getConnection() {
        return connection;
    }

}
