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ActiveMQ example source code file (KahaDBTest.java)

This example ActiveMQ source code file (KahaDBTest.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

activemqconnectionfactory, activemqqueue, brokerservice, brokerservice, connection, detected, exception, exception, io, ioexception, ioexception, jmsexception, kahadbstore, kahadbstore, randomaccessfile

The ActiveMQ KahaDBTest.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.kahadb;

import junit.framework.TestCase;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.command.ActiveMQQueue;

import javax.jms.*;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.io.FileNotFoundException;

/**
 * @author chirino
 */
public class KahaDBTest extends TestCase {

    protected BrokerService createBroker(KahaDBStore kaha) throws Exception {

        BrokerService broker = new BrokerService();
        broker.setUseJmx(false);
        broker.setPersistenceAdapter(kaha);
        broker.start();
        return broker;

    }

    private KahaDBStore createStore(boolean delete) throws IOException {
        KahaDBStore kaha = new KahaDBStore();
        kaha.setDirectory(new File("target/activemq-data/kahadb"));
        if( delete ) {
            kaha.deleteAllMessages();
        }
        return kaha;
    }

    public void testIgnoreMissingJournalfilesOptionSetFalse() throws Exception {
        KahaDBStore kaha = createStore(true);
        kaha.setJournalMaxFileLength(1024*100);
        assertFalse(kaha.isIgnoreMissingJournalfiles());
        BrokerService broker = createBroker(kaha);
        sendMessages(1000);
        broker.stop();

        // Delete some journal files..
        assertExistsAndDelete(new File(kaha.getDirectory(), "db-4.log"));
        assertExistsAndDelete(new File(kaha.getDirectory(), "db-8.log"));

        kaha = createStore(false);
        kaha.setJournalMaxFileLength(1024*100);
        assertFalse(kaha.isIgnoreMissingJournalfiles());
        try {
            broker = createBroker(kaha);
            fail("expected IOException");
        } catch (IOException e) {
            assertTrue( e.getMessage().startsWith("Detected missing/corrupt journal files") );
        }

    }


    public void testIgnoreMissingJournalfilesOptionSetTrue() throws Exception {
        KahaDBStore kaha = createStore(true);
        kaha.setJournalMaxFileLength(1024*100);
        assertFalse(kaha.isIgnoreMissingJournalfiles());
        BrokerService broker = createBroker(kaha);
        sendMessages(1000);
        broker.stop();

        // Delete some journal files..
        assertExistsAndDelete(new File(kaha.getDirectory(), "db-4.log"));
        assertExistsAndDelete(new File(kaha.getDirectory(), "db-8.log"));

        kaha = createStore(false);
        kaha.setIgnoreMissingJournalfiles(true);
        kaha.setJournalMaxFileLength(1024*100);
        broker = createBroker(kaha);

        // We know we won't get all the messages but we should get most of them.
        int count = receiveMessages();
        assertTrue( count > 800 ); 
        assertTrue( count < 1000 );

        broker.stop();
    }


    public void testCheckCorruptionNotIgnored() throws Exception {
        KahaDBStore kaha = createStore(true);
        assertFalse(kaha.isChecksumJournalFiles());
        assertFalse(kaha.isCheckForCorruptJournalFiles());

        kaha.setJournalMaxFileLength(1024*100);
        kaha.setChecksumJournalFiles(true);
        BrokerService broker = createBroker(kaha);
        sendMessages(1000);
        broker.stop();

        // Modify/Corrupt some journal files..
        assertExistsAndCorrupt(new File(kaha.getDirectory(), "db-4.log"));
        assertExistsAndCorrupt(new File(kaha.getDirectory(), "db-8.log"));

        kaha = createStore(false);
        kaha.setJournalMaxFileLength(1024*100);
        kaha.setChecksumJournalFiles(true);
        kaha.setCheckForCorruptJournalFiles(true);
        assertFalse(kaha.isIgnoreMissingJournalfiles());
        try {
            broker = createBroker(kaha);
            fail("expected IOException");
        } catch (IOException e) {
            assertTrue( e.getMessage().startsWith("Detected missing/corrupt journal files") );
        }

    }

    private void assertExistsAndCorrupt(File file) throws IOException {
        assertTrue(file.exists());
        RandomAccessFile f = new RandomAccessFile(file, "rw");
        try {
            f.seek(1024*5+134);
            f.write("... corruption string ...".getBytes());
        } finally {
            f.close();
        }
    }


    public void testCheckCorruptionIgnored() throws Exception {
        KahaDBStore kaha = createStore(true);
        kaha.setJournalMaxFileLength(1024*100);
        kaha.setChecksumJournalFiles(true);
        BrokerService broker = createBroker(kaha);
        sendMessages(1000);
        broker.stop();

        // Delete some journal files..
        assertExistsAndCorrupt(new File(kaha.getDirectory(), "db-4.log"));
        assertExistsAndCorrupt(new File(kaha.getDirectory(), "db-8.log"));

        kaha = createStore(false);
        kaha.setIgnoreMissingJournalfiles(true);
        kaha.setJournalMaxFileLength(1024*100);
        kaha.setChecksumJournalFiles(true);
        kaha.setCheckForCorruptJournalFiles(true);
        broker = createBroker(kaha);

        // We know we won't get all the messages but we should get most of them.
        int count = receiveMessages();
        assertTrue("Expected to received a min # of messages.. Got: "+count,  count > 990 );
        assertTrue( count < 1000 );

        broker.stop();
    }

    private void assertExistsAndDelete(File file) {
        assertTrue(file.exists());
        file.delete();
        assertFalse(file.exists());
    }

    private void sendMessages(int count) throws JMSException {
        ActiveMQConnectionFactory cf = new ActiveMQConnectionFactory("vm://localhost");
        Connection connection = cf.createConnection();
        try {
            Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
            MessageProducer producer = session.createProducer(new ActiveMQQueue("TEST"));
            for (int i = 0; i < count; i++) {
                producer.send(session.createTextMessage(createContent(i)));
            }
        } finally {
            connection.close();
        }
    }

    private int receiveMessages() throws JMSException {
        int rc=0;
        ActiveMQConnectionFactory cf = new ActiveMQConnectionFactory("vm://localhost");
        Connection connection = cf.createConnection();
        try {
            connection.start();
            Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
            MessageConsumer messageConsumer = session.createConsumer(new ActiveMQQueue("TEST"));
            while ( messageConsumer.receive(1000) !=null ) {
                rc++;
            }
            return rc;
        } finally {
            connection.close();
        }
    }

    private String createContent(int i) {
        StringBuilder sb = new StringBuilder(i+":");
        while( sb.length() < 1024 ) {
            sb.append("*");
        }
        return sb.toString();
    }

}

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