ActiveMQ example source code file (StoreQueueCursorNoDuplicateTest.java)

This example ActiveMQ source code file (StoreQueueCursorNoDuplicateTest.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

activemqqueue, activemqtextmessage, activemqtextmessage, brokerservice, brokerservice, connectioncontext, destinationstatistics, exception, exception, messageid, queue, string, string, systemusage

The ActiveMQ StoreQueueCursorNoDuplicateTest.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.broker.region.cursors;

import junit.framework.TestCase;

import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.broker.region.DestinationStatistics;
import org.apache.activemq.broker.region.MessageReference;
import org.apache.activemq.broker.region.Queue;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.command.ActiveMQTextMessage;
import org.apache.activemq.command.ConsumerInfo;
import org.apache.activemq.command.MessageId;
import org.apache.activemq.store.MessageStore;
import org.apache.activemq.store.PersistenceAdapter;
import org.apache.activemq.usage.SystemUsage;

/**
 * @author gtully
 * https://issues.apache.org/activemq/browse/AMQ-2020
 **/
public class StoreQueueCursorNoDuplicateTest extends TestCase {
    ActiveMQQueue destination = new ActiveMQQueue("queue-"
            + StoreQueueCursorNoDuplicateTest.class.getSimpleName());
    BrokerService brokerService;

    final static String mesageIdRoot = "11111:22222:";
    final int messageBytesSize = 1024;
    final String text = new String(new byte[messageBytesSize]);

    protected int count = 6;

    public void setUp() throws Exception {
        brokerService = createBroker();
        brokerService.setUseJmx(false);
        brokerService.deleteAllMessages();
        brokerService.start();
    }

    protected BrokerService createBroker() throws Exception {
        return new BrokerService();
    }

    public void tearDown() throws Exception {
        brokerService.stop();
    }

    public void testNoDuplicateAfterCacheFullAndReadPast() throws Exception {
        final PersistenceAdapter persistenceAdapter = brokerService
                .getPersistenceAdapter();
        final MessageStore queueMessageStore = persistenceAdapter
                .createQueueMessageStore(destination);
        final ConsumerInfo consumerInfo = new ConsumerInfo();
        final DestinationStatistics destinationStatistics = new DestinationStatistics();
        consumerInfo.setExclusive(true);

        final Queue queue = new Queue(brokerService, destination,
                queueMessageStore, destinationStatistics, null);

        queueMessageStore.start();

        QueueStorePrefetch underTest = new QueueStorePrefetch(queue);
        SystemUsage systemUsage = new SystemUsage();
        // ensure memory limit is reached
        systemUsage.getMemoryUsage().setLimit(messageBytesSize * (count + 2));
        underTest.setSystemUsage(systemUsage);
        underTest.setEnableAudit(false);
        underTest.start();
        assertTrue("cache enabled", underTest.isUseCache() && underTest.isCacheEnabled());

        final ConnectionContext contextNotInTx = new ConnectionContext();
        for (int i = 0; i < count; i++) {
            ActiveMQTextMessage msg = getMessage(i);
            msg.setMemoryUsage(systemUsage.getMemoryUsage());

            queueMessageStore.addMessage(contextNotInTx, msg);
            underTest.addMessageLast(msg);
        }

        assertTrue("cache is disabled as limit reached", !underTest.isCacheEnabled());
        int dequeueCount = 0;

        underTest.setMaxBatchSize(2);
        underTest.reset();
        while (underTest.hasNext() && dequeueCount < count) {
            MessageReference ref = underTest.next();
            ref.decrementReferenceCount();
            underTest.remove();
            assertEquals(dequeueCount++, ref.getMessageId()
                    .getProducerSequenceId());
        }
        underTest.release();
        assertEquals(count, dequeueCount);
    }

    private ActiveMQTextMessage getMessage(int i) throws Exception {
        ActiveMQTextMessage message = new ActiveMQTextMessage();
        MessageId id = new MessageId(mesageIdRoot + i);
        id.setBrokerSequenceId(i);
        id.setProducerSequenceId(i);
        message.setMessageId(id);
        message.setDestination(destination);
        message.setPersistent(true);
        message.setResponseRequired(true);
        message.setText("Msg:" + i + " " + text);
        assertEquals(message.getMessageId().getProducerSequenceId(), i);
        return message;
    }
}