TemporaryQueueReplyManager.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.camel.component.jms.reply;

import java.util.concurrent.atomic.AtomicBoolean;

import javax.jms.Destination;
import javax.jms.ExceptionListener;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.Session;
import javax.jms.TemporaryQueue;

import org.apache.camel.AsyncCallback;
import org.apache.camel.CamelContext;
import org.apache.camel.Exchange;
import org.apache.camel.component.jms.DefaultJmsMessageListenerContainer;
import org.apache.camel.component.jms.DefaultSpringErrorHandler;
import org.springframework.jms.listener.AbstractMessageListenerContainer;
import org.springframework.jms.listener.DefaultMessageListenerContainer;
import org.springframework.jms.support.destination.DestinationResolver;

/**
 * A {@link ReplyManager} when using temporary queues.
 *
 * @version 
 */
public class TemporaryQueueReplyManager extends ReplyManagerSupport {
    
    final TemporaryReplyQueueDestinationResolver destResolver = new TemporaryReplyQueueDestinationResolver();
    
    public TemporaryQueueReplyManager(CamelContext camelContext) {
        super(camelContext);
    }

    @Override
    public Destination getReplyTo() {
        try {
            destResolver.destinationReady();
        } catch (InterruptedException e) {
            log.warn("Interrupted while waiting for JMSReplyTo destination refresh", e);
        }
        return super.getReplyTo();
    }
    
    public String registerReply(ReplyManager replyManager, Exchange exchange, AsyncCallback callback,
                                String originalCorrelationId, String correlationId, long requestTimeout) {
        // add to correlation map
        TemporaryQueueReplyHandler handler = new TemporaryQueueReplyHandler(this, exchange, callback, originalCorrelationId, correlationId, requestTimeout);
        correlation.put(correlationId, handler, requestTimeout);
        return correlationId;
    }

    public void updateCorrelationId(String correlationId, String newCorrelationId, long requestTimeout) {
        log.trace("Updated provisional correlationId [{}] to expected correlationId [{}]", correlationId, newCorrelationId);

        ReplyHandler handler = correlation.remove(correlationId);
        if (handler != null) {
            correlation.put(newCorrelationId, handler, requestTimeout);
        }
    }

    @Override
    protected void handleReplyMessage(String correlationID, Message message) {
        ReplyHandler handler = correlation.get(correlationID);
        if (handler == null && endpoint.isUseMessageIDAsCorrelationID()) {
            handler = waitForProvisionCorrelationToBeUpdated(correlationID, message);
        }

        if (handler != null) {
            try {
                handler.onReply(correlationID, message);
            } finally {
                correlation.remove(correlationID);
            }
        } else {
            // we could not correlate the received reply message to a matching request and therefore
            // we cannot continue routing the unknown message
            // log a warn and then ignore the message
            log.warn("Reply received for unknown correlationID [{}]. The message will be ignored: {}", correlationID, message);
        }
    }

    public void setReplyToSelectorHeader(org.apache.camel.Message camelMessage, Message jmsMessage) throws JMSException {
        // noop
    }

    @Override
    protected AbstractMessageListenerContainer createListenerContainer() throws Exception {
        // Use DefaultMessageListenerContainer as it supports reconnects (see CAMEL-3193)
        DefaultMessageListenerContainer answer = new DefaultJmsMessageListenerContainer(endpoint);

        answer.setDestinationName("temporary");
        answer.setDestinationResolver(destResolver);
        answer.setAutoStartup(true);
        if (endpoint.getMaxMessagesPerTask() >= 0) {
            answer.setMaxMessagesPerTask(endpoint.getMaxMessagesPerTask());
        }
        answer.setIdleConsumerLimit(endpoint.getIdleConsumerLimit());
        answer.setIdleTaskExecutionLimit(endpoint.getIdleTaskExecutionLimit());
        answer.setMessageListener(this);
        answer.setPubSubDomain(false);
        answer.setSubscriptionDurable(false);
        answer.setConcurrentConsumers(endpoint.getConcurrentConsumers());
        if (endpoint.getMaxConcurrentConsumers() > 0) {
            answer.setMaxConcurrentConsumers(endpoint.getMaxConcurrentConsumers());
        }
        answer.setConnectionFactory(endpoint.getConnectionFactory());
        // we use CACHE_CONSUMER by default to cling to the consumer as long as we can, since we can only consume
        // msgs from the JMS Connection that created the temp destination in the first place
        if (endpoint.getReplyToCacheLevelName() != null) {
            answer.setCacheLevelName(endpoint.getReplyToCacheLevelName());
        } else {
            answer.setCacheLevel(DefaultMessageListenerContainer.CACHE_CONSUMER);
        }
        String clientId = endpoint.getClientId();
        if (clientId != null) {
            clientId += ".CamelReplyManager";
            answer.setClientId(clientId);
        }

        // we cannot do request-reply over JMS with transaction
        answer.setSessionTransacted(false);
        
        // other optional properties
        answer.setExceptionListener(new TemporaryReplyQueueExceptionListener(destResolver, endpoint.getExceptionListener()));

        if (endpoint.getErrorHandler() != null) {
            answer.setErrorHandler(endpoint.getErrorHandler());
        } else {
            answer.setErrorHandler(new DefaultSpringErrorHandler(TemporaryQueueReplyManager.class, endpoint.getErrorHandlerLoggingLevel(), endpoint.isErrorHandlerLogStackTrace()));
        }
        if (endpoint.getReceiveTimeout() >= 0) {
            answer.setReceiveTimeout(endpoint.getReceiveTimeout());
        }
        if (endpoint.getRecoveryInterval() >= 0) {
            answer.setRecoveryInterval(endpoint.getRecoveryInterval());
        }
        if (endpoint.getTaskExecutor() != null) {
            if (log.isDebugEnabled()) {
                log.debug("Using custom TaskExecutor: {} on listener container: {}", endpoint.getTaskExecutor(), answer);
            }
            answer.setTaskExecutor(endpoint.getTaskExecutor());
        }

        // setup a bean name which is used by Spring JMS as the thread name
        // use the name of the request destination
        String name = "TemporaryQueueReplyManager[" + endpoint.getDestinationName() + "]";
        answer.setBeanName(name);

        if (answer.getConcurrentConsumers() > 1) {
            // log that we are using concurrent consumers
            log.info("Using {}-{} concurrent consumers on {}",
                    new Object[]{answer.getConcurrentConsumers(), answer.getMaxConcurrentConsumers(), name});
        }
        return answer;
    }

    private final class TemporaryReplyQueueExceptionListener implements ExceptionListener {
        private final TemporaryReplyQueueDestinationResolver destResolver;
        private final ExceptionListener delegate;

        private TemporaryReplyQueueExceptionListener(TemporaryReplyQueueDestinationResolver destResolver, 
                ExceptionListener delegate) {
            this.destResolver = destResolver;
            this.delegate = delegate;
        }

        @Override
        public void onException(JMSException exception) {
            // capture exceptions, and schedule a refresh of the ReplyTo destination
            log.warn("Exception inside the DMLC for Temporary ReplyTo Queue for destination " + endpoint.getDestinationName() +
            		", refreshing ReplyTo destination", exception);
            destResolver.scheduleRefresh();
            // serve as a proxy for any exception listener the user may have set explicitly
            if (delegate != null) {
                delegate.onException(exception);
            }
        }

    }

    private final class TemporaryReplyQueueDestinationResolver implements DestinationResolver {
        private TemporaryQueue queue;
        private AtomicBoolean refreshWanted = new AtomicBoolean(false);

        public Destination resolveDestinationName(Session session, String destinationName, boolean pubSubDomain) 
                throws JMSException {
            // use a temporary queue to gather the reply message
            synchronized (refreshWanted) {
                if (queue == null || refreshWanted.compareAndSet(true, false)) {
                    queue = session.createTemporaryQueue();
                    setReplyTo(queue);
                    log.debug("Refreshed Temporary ReplyTo Queue. New queue: " + queue.getQueueName());
                    refreshWanted.notifyAll();
                }
            }
            return queue;
        }
        
        public void scheduleRefresh() {
            refreshWanted.set(true);
        }
        
        public void destinationReady() throws InterruptedException {
            if (refreshWanted.get()) {
                synchronized (refreshWanted) {
                    log.debug("Waiting for new Temp ReplyTo destination to be assigned to continue");
                    refreshWanted.wait();
                }
            }
        }
    }

}