ActiveMQ example source code file (NoSpaceIOTest.java)

This example ActiveMQ source code file (NoSpaceIOTest.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, atomiclong, atomiclong, brokerservice, connection, exception, exception, file, file, io, jmsexception, randomaccessfile, randomaccessfile, session

The ActiveMQ NoSpaceIOTest.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 java.io.File;
import java.io.RandomAccessFile;
import java.util.concurrent.atomic.AtomicLong;
import javax.jms.Connection;
import javax.jms.JMSException;
import javax.jms.MessageConsumer;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.broker.BrokerService;
import org.apache.activemq.command.ActiveMQQueue;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.junit.Ignore;
import org.junit.Test;

public class NoSpaceIOTest {
    private static final Logger LOG = LoggerFactory.getLogger(NoSpaceIOTest.class);

    // need an app to input to console in intellij idea
    public static void main(String[] args) throws Exception {
       new NoSpaceIOTest().testRunOutOfSpace();
    }

    // handy way to validate some out of space related errors with a usb key
    // allow it to run out of space, delete toDelete and see it recover
    @Ignore("needs small volume, like usb key")
    @Test
    public void testRunOutOfSpace() throws Exception {
        BrokerService broker = new BrokerService();
        File dataDir = new File("/Volumes/NO NAME/");
        File useUpSpace = new File(dataDir, "bigFile");
        if (!useUpSpace.exists()) {
            LOG.info("using up some space...");
            RandomAccessFile filler = new RandomAccessFile(useUpSpace, "rw");
            filler.setLength(1024*1024*1212); // use ~1.xG of 2G (usb) volume
            filler.close();
            File toDelete = new File(dataDir, "toDelete");
            filler = new RandomAccessFile(toDelete, "rw");
            filler.setLength(1024*1024*32*10); // 10 data files
            filler.close();
        }
        broker.setDataDirectoryFile(dataDir);
        broker.start();
        AtomicLong consumed = new AtomicLong(0);
        consume(consumed);
        LOG.info("consumed: " + consumed);

        broker.getPersistenceAdapter().checkpoint(true);

        AtomicLong sent = new AtomicLong(0);
        try {
            produce(sent, 200);
        } catch (Exception expected) {
            LOG.info("got ex, sent: " + sent);
        }
        LOG.info("sent: " + sent);
        System.out.println("Remove toDelete file and press any key to continue");
        int read = System.in.read();
        System.err.println("read:" + read);

        LOG.info("Trying to send again: " + sent);
        try {
            produce(sent, 200);
        } catch (Exception expected) {
            LOG.info("got ex, sent: " + sent);
        }
        LOG.info("sent: " + sent);
    }

    private void consume(AtomicLong consumed) throws JMSException {
        Connection c = new ActiveMQConnectionFactory("vm://localhost").createConnection();
        try {
            c.start();
            Session s = c.createSession(false, Session.AUTO_ACKNOWLEDGE);
            MessageConsumer consumer = s.createConsumer(new ActiveMQQueue("t"));
            while (consumer.receive(2000) != null) {
                consumed.incrementAndGet();
            }
        } finally {
            c.close();
        }
    }

    private void produce(AtomicLong sent, long toSend) throws JMSException {
        Connection c = new ActiveMQConnectionFactory("vm://localhost").createConnection();
        try {
            c.start();
            Session s = c.createSession(false, Session.AUTO_ACKNOWLEDGE);
            MessageProducer producer = s.createProducer(new ActiveMQQueue("t"));
            TextMessage m = s.createTextMessage();
            m.setText(String.valueOf(new char[1024*1024]));
            for (int i=0; i<toSend; i++) {
                producer.send(m);
                sent.incrementAndGet();
            }
        } finally {
            c.close();
        }
    }
}