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ActiveMQ example source code file (SchedulerBroker.java)

This example ActiveMQ source code file (SchedulerBroker.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, file, io, job, jobscheduler, long, long, message, object, object, override, producerbrokerexchange, string, string

The ActiveMQ SchedulerBroker.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.scheduler;

import java.io.File;
import java.util.concurrent.atomic.AtomicBoolean;

import org.apache.activemq.ScheduledMessage;
import org.apache.activemq.advisory.AdvisorySupport;
import org.apache.activemq.broker.Broker;
import org.apache.activemq.broker.BrokerFilter;
import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.broker.ProducerBrokerExchange;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.Message;
import org.apache.activemq.command.MessageId;
import org.apache.activemq.command.ProducerId;
import org.apache.activemq.command.ProducerInfo;
import org.apache.activemq.openwire.OpenWireFormat;
import org.apache.activemq.security.SecurityContext;
import org.apache.activemq.state.ProducerState;
import org.apache.activemq.util.IdGenerator;
import org.apache.activemq.util.LongSequenceGenerator;
import org.apache.activemq.util.TypeConversionSupport;
import org.apache.activemq.wireformat.WireFormat;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.kahadb.util.ByteSequence;

public class SchedulerBroker extends BrokerFilter implements JobListener {
    private static final Logger LOG = LoggerFactory.getLogger(SchedulerBroker.class);
    private static final IdGenerator ID_GENERATOR = new IdGenerator();
    private final LongSequenceGenerator messageIdGenerator = new LongSequenceGenerator();
    private final AtomicBoolean started = new AtomicBoolean();
    private final WireFormat wireFormat = new OpenWireFormat();
    private final ConnectionContext context = new ConnectionContext();
    private final ProducerId producerId = new ProducerId();
    private File directory;

    private JobSchedulerStore store;
    private JobScheduler scheduler;

    public SchedulerBroker(Broker next, File directory) throws Exception {
        super(next);
        this.directory = directory;
        this.producerId.setConnectionId(ID_GENERATOR.generateId());
        this.context.setSecurityContext(SecurityContext.BROKER_SECURITY_CONTEXT);
        context.setBroker(next);
        LOG.info("Scheduler using directory: " + directory);

    }

    public synchronized JobScheduler getJobScheduler() throws Exception {
        return new JobSchedulerFacade(this);
    }

    /**
     * @return the directory
     */
    public File getDirectory() {
        return this.directory;
    }
    /**
     * @param directory
     *            the directory to set
     */
    public void setDirectory(File directory) {
        this.directory = directory;
    }

    @Override
    public void start() throws Exception {
        this.started.set(true);
        getInternalScheduler();
        super.start();
    }

    @Override
    public void stop() throws Exception {
        if (this.started.compareAndSet(true, false)) {

            if (this.store != null) {
                this.store.stop();
            }
            if (this.scheduler != null) {
                this.scheduler.removeListener(this);
                this.scheduler = null;
            }
        }
        super.stop();
    }

    @Override
    public void send(ProducerBrokerExchange producerExchange, Message messageSend) throws Exception {
        long delay = 0;
        long period = 0;
        int repeat = 0;
        String cronEntry = "";
        String jobId = (String) messageSend.getProperty(ScheduledMessage.AMQ_SCHEDULED_ID);
        Object cronValue = messageSend.getProperty(ScheduledMessage.AMQ_SCHEDULED_CRON);
        Object periodValue = messageSend.getProperty(ScheduledMessage.AMQ_SCHEDULED_PERIOD);
        Object delayValue = messageSend.getProperty(ScheduledMessage.AMQ_SCHEDULED_DELAY);

        String physicalName = messageSend.getDestination().getPhysicalName();
        boolean schedularManage = physicalName.regionMatches(true, 0,
        		ScheduledMessage.AMQ_SCHEDULER_MANAGEMENT_DESTINATION, 0,
        		ScheduledMessage.AMQ_SCHEDULER_MANAGEMENT_DESTINATION.length());

        if (schedularManage == true) {

        	JobScheduler scheduler = getInternalScheduler();
	        ActiveMQDestination replyTo = messageSend.getReplyTo();

	        String action = (String) messageSend.getProperty(ScheduledMessage.AMQ_SCHEDULER_ACTION);

	        if (action != null ) {

	        	Object startTime = messageSend.getProperty(ScheduledMessage.AMQ_SCHEDULER_ACTION_START_TIME);
	        	Object endTime = messageSend.getProperty(ScheduledMessage.AMQ_SCHEDULER_ACTION_END_TIME);

		        if (replyTo != null && action.equals(ScheduledMessage.AMQ_SCHEDULER_ACTION_BROWSE)) {

		        	if( startTime != null && endTime != null ) {

		                long start = (Long) TypeConversionSupport.convert(startTime, Long.class);
		                long finish = (Long) TypeConversionSupport.convert(endTime, Long.class);

			        	for (Job job : scheduler.getAllJobs(start, finish)) {
			        		sendScheduledJob(producerExchange.getConnectionContext(), job, replyTo);
			        	}
		        	} else {
			        	for (Job job : scheduler.getAllJobs()) {
			        		sendScheduledJob(producerExchange.getConnectionContext(), job, replyTo);
			        	}
		        	}
		        }
		        if (jobId != null && action.equals(ScheduledMessage.AMQ_SCHEDULER_ACTION_REMOVE)) {
		        	scheduler.remove(jobId);
		        } else if (action.equals(ScheduledMessage.AMQ_SCHEDULER_ACTION_REMOVEALL)) {

		        	if( startTime != null && endTime != null ) {

		                long start = (Long) TypeConversionSupport.convert(startTime, Long.class);
		                long finish = (Long) TypeConversionSupport.convert(endTime, Long.class);

		                scheduler.removeAllJobs(start, finish);
		        	} else {
			        	scheduler.removeAllJobs();
		        	}
		        }
	        }

        } else if ((cronValue != null || periodValue != null || delayValue != null) && jobId == null) {
            //clear transaction context
            Message msg = messageSend.copy();
            msg.setTransactionId(null);
            org.apache.activemq.util.ByteSequence packet = wireFormat.marshal(msg);
            if (cronValue != null) {
                cronEntry = cronValue.toString();
            }
            if (periodValue != null) {
              period = (Long) TypeConversionSupport.convert(periodValue, Long.class);
            }
            if (delayValue != null) {
                delay = (Long) TypeConversionSupport.convert(delayValue, Long.class);
            }
            Object repeatValue = msg.getProperty(ScheduledMessage.AMQ_SCHEDULED_REPEAT);
            if (repeatValue != null) {
                repeat = (Integer) TypeConversionSupport.convert(repeatValue, Integer.class);
            }
            getInternalScheduler().schedule(msg.getMessageId().toString(),
                    new ByteSequence(packet.data, packet.offset, packet.length),cronEntry, delay, period, repeat);

        } else {
            super.send(producerExchange, messageSend);
        }
    }

    public void scheduledJob(String id, ByteSequence job) {
        org.apache.activemq.util.ByteSequence packet = new org.apache.activemq.util.ByteSequence(job.getData(), job
                .getOffset(), job.getLength());
        try {
            Message messageSend = (Message) this.wireFormat.unmarshal(packet);
            messageSend.setOriginalTransactionId(null);
            Object repeatValue = messageSend.getProperty(ScheduledMessage.AMQ_SCHEDULED_REPEAT);
            Object cronValue = messageSend.getProperty(ScheduledMessage.AMQ_SCHEDULED_REPEAT);
            String cronStr = cronValue != null ? cronValue.toString() : null;
            int repeat = 0;
            if (repeatValue != null) {
                repeat = (Integer) TypeConversionSupport.convert(repeatValue, Integer.class);
            }

            if (repeat != 0 || cronStr != null && cronStr.length() > 0) {
                // create a unique id - the original message could be sent
                // lots of times
                messageSend.setMessageId(
                		new MessageId(this.producerId, this.messageIdGenerator.getNextSequenceId()));
            }

            // Add the jobId as a property
            messageSend.setProperty("scheduledJobId", id);

            // if this goes across a network - we don't want it rescheduled
            messageSend.removeProperty(ScheduledMessage.AMQ_SCHEDULED_PERIOD);
            messageSend.removeProperty(ScheduledMessage.AMQ_SCHEDULED_DELAY);
            messageSend.removeProperty(ScheduledMessage.AMQ_SCHEDULED_REPEAT);
            messageSend.removeProperty(ScheduledMessage.AMQ_SCHEDULED_CRON);

            final ProducerBrokerExchange producerExchange = new ProducerBrokerExchange();
            producerExchange.setConnectionContext(context);
            producerExchange.setMutable(true);
            producerExchange.setProducerState(new ProducerState(new ProducerInfo()));
            super.send(producerExchange, messageSend);
        } catch (Exception e) {
            LOG.error("Failed to send scheduled message " + id, e);
        }
    }

    protected synchronized JobScheduler getInternalScheduler() throws Exception {
        if (this.started.get()) {
            if (this.scheduler == null) {
                this.scheduler = getStore().getJobScheduler("JMS");
                this.scheduler.addListener(this);
            }
            return this.scheduler;
        }
        return null;
    }

    private JobSchedulerStore getStore() throws Exception {
        if (started.get()) {
            if (this.store == null) {
                this.store = new JobSchedulerStore();
                this.store.setDirectory(directory);
                this.store.start();
            }
            return this.store;
        }
        return null;
    }

	protected void sendScheduledJob(ConnectionContext context, Job job, ActiveMQDestination replyTo)
			throws Exception {

        org.apache.activemq.util.ByteSequence packet = new org.apache.activemq.util.ByteSequence(job.getPayload());
        try {
            Message msg = (Message) this.wireFormat.unmarshal(packet);
            msg.setOriginalTransactionId(null);
    		msg.setPersistent(false);
    		msg.setType(AdvisorySupport.ADIVSORY_MESSAGE_TYPE);
    		msg.setMessageId(new MessageId(this.producerId, this.messageIdGenerator.getNextSequenceId()));
    		msg.setDestination(replyTo);
    		msg.setResponseRequired(false);
    		msg.setProducerId(this.producerId);

            // Add the jobId as a property
    		msg.setProperty("scheduledJobId", job.getJobId());

    		final boolean originalFlowControl = context.isProducerFlowControl();
    		final ProducerBrokerExchange producerExchange = new ProducerBrokerExchange();
    		producerExchange.setConnectionContext(context);
    		producerExchange.setMutable(true);
    		producerExchange.setProducerState(new ProducerState(new ProducerInfo()));
    		try {
    			context.setProducerFlowControl(false);
    			this.next.send(producerExchange, msg);
    		} finally {
    			context.setProducerFlowControl(originalFlowControl);
    		}
        } catch (Exception e) {
            LOG.error("Failed to send scheduled message " + job.getJobId(), e);
        }

	}
}

Other ActiveMQ examples (source code examples)

Here is a short list of links related to this ActiveMQ SchedulerBroker.java source code file:

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