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

package com.sun.messaging.jmq.jmsserver;

import java.util.Iterator;
import java.util.List;

import com.sun.messaging.jmq.jmsserver.service.Service;
import com.sun.messaging.jmq.jmsserver.service.ServiceManager;
import com.sun.messaging.jmq.jmsserver.service.imq.IMQDirectService;
import com.sun.messaging.jmq.jmsserver.service.imq.IMQService;
import com.sun.messaging.jmq.jmsservice.JMSRABroker;
import com.sun.messaging.jmq.jmsservice.JMSService;

/**
 * Wrapper used to start the broker. It wraps a singleton class (only one broker can be running in any process).
 * <P>
 *
 * <u>Example</u>
 * <P>
 * <code><PRE>
 *      BrokerProcess bp = BrokerProcess.getBrokerProcess();
 *      try {
 *
 *          Properties ht = BrokerProcess.convertArgs(args);
 *          int exitcode = bp.start(true, ht, null);
 *          System.out.println("Broker exited with " + exitcode);
 *
 *      } catch (IllegalArgumentException ex) {
 *          System.err.println("Bad Argument " + ex.getMessage());
 *          System.out.println(BrokerProcess.usage());
 *      }
 * </PRE></code>
 */
public class JMSRA_BrokerProcess extends BrokerProcess implements JMSRABroker {
    private static final String DEFAULT_DIRECTMODE_SERVICE_NAME = "jmsdirect";

    /**
     * Return the default JMS Service that supports 'DIRECT' in-JVM Java EE JMS clients.
     *
     * @throws IllegalStateException if the broker is already stopped
     *
     */
    @Override
    public JMSService getJMSService() throws IllegalStateException {
        ServiceManager sm = Globals.getServiceManager();
        JMSService jmsService = getJMSService(DEFAULT_DIRECTMODE_SERVICE_NAME);

        if (jmsService != null) {
            return (jmsService);
        }

        /*
         * If "jmsdirect" is not available, loop through all services
         */
        List serviceNames = sm.getAllServiceNames();
        Iterator iter = serviceNames.iterator();

        while (iter.hasNext()) {
            jmsService = getJMSService((String) iter.next());

            if (jmsService != null) {
                return (jmsService);
            }
        }

        return (null);
    }

    /**
     * Return the named JMS Service that supports 'DIRECT' in-JVM Java EEJMS clients.
     *
     * @param serviceName The name of the service to return
     *
     * @throws IllegalStateException if the broker is already stopped
     */
    @Override
    public JMSService getJMSService(String serviceName) throws IllegalStateException {
        ServiceManager sm = Globals.getServiceManager();
        Service svc;
        IMQService imqSvc;
        IMQDirectService imqDirectSvc;

        if (sm == null) {
            return (null);
        }

        svc = sm.getService(serviceName);

        if (svc == null) {
            return (null);
        }

        if (!(svc instanceof IMQService)) {
            return (null);
        }

        imqSvc = (IMQService) svc;

        if (!imqSvc.isDirect()) {
            return (null);
        }

        if (!(imqSvc instanceof IMQDirectService)) {
            return (null);
        }

        imqDirectSvc = (IMQDirectService) imqSvc;

        return imqDirectSvc.getJMSService();
    }

}
