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ActiveMQ example source code file (AMQTopicMessageStore.java)

This example ActiveMQ source code file (AMQTopicMessageStore.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

exception, exception, io, ioexception, ioexception, messageack, messagecounter, messageevaluationcontext, messageid, messagerecoverylistener, string, string, subscriptioninfo, subscriptioninfo, topicmessagestore

The ActiveMQ AMQTopicMessageStore.java source code

/**
 * 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.activemq.store.amq;

import java.io.IOException;

import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.command.ActiveMQTopic;
import org.apache.activemq.command.JournalTopicAck;
import org.apache.activemq.command.Message;
import org.apache.activemq.command.MessageAck;
import org.apache.activemq.command.MessageId;
import org.apache.activemq.command.SubscriptionInfo;
import org.apache.activemq.filter.BooleanExpression;
import org.apache.activemq.filter.MessageEvaluationContext;
import org.apache.activemq.kaha.impl.async.Location;
import org.apache.activemq.selector.SelectorParser;
import org.apache.activemq.store.MessageRecoveryListener;
import org.apache.activemq.store.TopicMessageStore;
import org.apache.activemq.store.TopicReferenceStore;
import org.apache.activemq.transaction.Synchronization;
import org.apache.activemq.util.IOExceptionSupport;
import org.apache.activemq.util.SubscriptionKey;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A MessageStore that uses a Journal to store it's messages.
 * 
 * 
 */
public class AMQTopicMessageStore extends AMQMessageStore implements TopicMessageStore {

    private static final Logger LOG = LoggerFactory.getLogger(AMQTopicMessageStore.class);
    private TopicReferenceStore topicReferenceStore;
    public AMQTopicMessageStore(AMQPersistenceAdapter adapter,TopicReferenceStore topicReferenceStore, ActiveMQTopic destinationName) {
        super(adapter, topicReferenceStore, destinationName);
        this.topicReferenceStore = topicReferenceStore;
    }

    public void recoverSubscription(String clientId, String subscriptionName, MessageRecoveryListener listener) throws Exception {
        flush();
        topicReferenceStore.recoverSubscription(clientId, subscriptionName, new RecoveryListenerAdapter(this, listener));
    }

    public void recoverNextMessages(String clientId, String subscriptionName,
            int maxReturned, final MessageRecoveryListener listener)
            throws Exception {
        RecoveryListenerAdapter recoveryListener = new RecoveryListenerAdapter(this, listener);
            topicReferenceStore.recoverNextMessages(clientId, subscriptionName,maxReturned, recoveryListener);
            if (recoveryListener.size() == 0) {
                flush();
                topicReferenceStore.recoverNextMessages(clientId,subscriptionName, maxReturned, recoveryListener);
            }
    }

    public SubscriptionInfo lookupSubscription(String clientId, String subscriptionName) throws IOException {
        return topicReferenceStore.lookupSubscription(clientId, subscriptionName);
    }

    public void addSubsciption(SubscriptionInfo subscriptionInfo, boolean retroactive) throws IOException {
        peristenceAdapter.writeCommand(subscriptionInfo, false);
        topicReferenceStore.addSubsciption(subscriptionInfo, retroactive);
    }

    /**
     */
    public void acknowledge(final ConnectionContext context, final String clientId, final String subscriptionName,
                            final MessageId messageId, final MessageAck originalAck) throws IOException {
        final boolean debug = LOG.isDebugEnabled();
        JournalTopicAck ack = new JournalTopicAck();
        ack.setDestination(destination);
        ack.setMessageId(messageId);
        ack.setMessageSequenceId(messageId.getBrokerSequenceId());
        ack.setSubscritionName(subscriptionName);
        ack.setClientId(clientId);
        ack.setTransactionId(context.getTransaction() != null ? context.getTransaction().getTransactionId() : null);
        final Location location = peristenceAdapter.writeCommand(ack, false);
        final SubscriptionKey key = new SubscriptionKey(clientId, subscriptionName);
        if (!context.isInTransaction()) {
            if (debug) {
                LOG.debug("Journalled acknowledge for: " + messageId + ", at: " + location);
            }
            acknowledge(context,messageId, location, clientId,subscriptionName);
        } else {
            if (debug) {
                LOG.debug("Journalled transacted acknowledge for: " + messageId + ", at: " + location);
            }
            lock.lock();
            try {
                inFlightTxLocations.add(location);
            }finally {
                lock.unlock();
            }
            transactionStore.acknowledge(this, ack, location);
            context.getTransaction().addSynchronization(new Synchronization() {

                public void afterCommit() throws Exception {
                    if (debug) {
                        LOG.debug("Transacted acknowledge commit for: " + messageId + ", at: " + location);
                    }
                    lock.lock();
                    try {
                        inFlightTxLocations.remove(location);
                        acknowledge(context,messageId, location, clientId,subscriptionName);
                    }finally {
                        lock.unlock();
                    }
                }

                public void afterRollback() throws Exception {
                    if (debug) {
                        LOG.debug("Transacted acknowledge rollback for: " + messageId + ", at: " + location);
                    }
                    lock.lock();
                    try{
                        inFlightTxLocations.remove(location);
                    }finally {
                        lock.unlock();
                    }
                }
            });
        }
    }

    public boolean replayAcknowledge(ConnectionContext context, String clientId, String subscritionName, MessageId messageId) {
        try {
            SubscriptionInfo sub = topicReferenceStore.lookupSubscription(clientId, subscritionName);
            if (sub != null) {
                topicReferenceStore.acknowledge(context, clientId, subscritionName, messageId, null);
                return true;
            }
        } catch (Throwable e) {
            LOG.debug("Could not replay acknowledge for message '" + messageId + "'.  Message may have already been acknowledged. reason: " + e);
        }
        return false;
    }

    /**
     * @param messageId
     * @param location
     * @param key
     * @throws IOException 
     */
    protected void acknowledge(final ConnectionContext context, MessageId messageId,
            Location location, String clientId, String subscriptionName)
            throws IOException {
        MessageAck ack = null;
        lock.lock();
        try {
            lastLocation = location;
        }finally {
            lock.unlock();
        }
        
            if (topicReferenceStore.acknowledgeReference(context, clientId,
                    subscriptionName, messageId)) {
                ack = new MessageAck();
                ack.setLastMessageId(messageId);
               
            }
        
        if (ack != null) {
            removeMessage(context, ack);
        }
    }

    /**
     * @return Returns the longTermStore.
     */
    public TopicReferenceStore getTopicReferenceStore() {
        return topicReferenceStore;
    }

    public void deleteSubscription(String clientId, String subscriptionName) throws IOException {
        topicReferenceStore.deleteSubscription(clientId, subscriptionName);
    }

    public SubscriptionInfo[] getAllSubscriptions() throws IOException {
        return topicReferenceStore.getAllSubscriptions();
    }

    public int getMessageCount(String clientId, String subscriberName) throws IOException {
        flush();
        SubscriptionInfo info = lookupSubscription(clientId, subscriberName);
        try {
            MessageCounter counter = new MessageCounter(info, this);
            topicReferenceStore.recoverSubscription(clientId, subscriberName, counter);
            return counter.count;
        } catch (Exception e) {
            throw IOExceptionSupport.create(e);
        }
    }
    
    private class MessageCounter implements MessageRecoveryListener {
        
        int count = 0;
        SubscriptionInfo info;
        BooleanExpression selectorExpression;
        TopicMessageStore store;
        
        public MessageCounter(SubscriptionInfo info, TopicMessageStore store) throws Exception {
            this.info = info;
            if (info != null) {
                String selector = info.getSelector();
                if (selector != null) {
                    this.selectorExpression = SelectorParser.parse(selector);
                }
            }
            this.store = store;
        }

        public boolean recoverMessageReference(MessageId ref) throws Exception {
            if (selectorExpression != null) {
                MessageEvaluationContext ctx = new MessageEvaluationContext();
                ctx.setMessageReference(store.getMessage(ref));
                if (selectorExpression.matches(ctx)) {
                    count++;
                }
            } else {
                count ++;
            }
            return true;
        }

        public boolean recoverMessage(Message message) throws Exception {
            if (selectorExpression != null) {
                MessageEvaluationContext ctx = new MessageEvaluationContext();
                ctx.setMessageReference(store.getMessage(message.getMessageId()));
                if (selectorExpression.matches(ctx)) {
                    count++;
                }
            } else {
                count++;
            }
            return true;
        }

        public boolean isDuplicate(MessageId ref) {
            return false;
        }

        public boolean hasSpace() {
            return true;
        }
    }

    public void resetBatching(String clientId, String subscriptionName) {
        topicReferenceStore.resetBatching(clientId, subscriptionName);
    }
}

Other ActiveMQ examples (source code examples)

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