/*
* JBoss, Home of Professional Open Source.
* Copyright (c) 2011, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.demos.ejb3.rar;
import javax.resource.ResourceException;
import javax.resource.spi.ActivationSpec;
import javax.resource.spi.BootstrapContext;
import javax.resource.spi.Connector;
import javax.resource.spi.ResourceAdapter;
import javax.resource.spi.ResourceAdapterInternalException;
import javax.resource.spi.TransactionSupport;
import javax.resource.spi.UnavailableException;
import javax.resource.spi.endpoint.MessageEndpoint;
import javax.resource.spi.endpoint.MessageEndpointFactory;
import javax.resource.spi.work.Work;
import javax.resource.spi.work.WorkException;
import javax.resource.spi.work.WorkManager;
import javax.transaction.xa.XAResource;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingDeque;
import static java.util.concurrent.TimeUnit.SECONDS;
/**
* @author <a href="mailto:cdewolf@redhat.com">Carlo de Wolf</a>
*/
@Connector(
reauthenticationSupport = false,
transactionSupport = TransactionSupport.TransactionSupportLevel.NoTransaction)
public class SimpleQueueResourceAdapter implements ResourceAdapter {
private static final BlockingQueue<String> queue = new LinkedBlockingDeque<String>();
private static WorkManager workManager;
private static List<MessageEndpointFactory> endpointFactories = new LinkedList<MessageEndpointFactory>();
@Override
public void start(BootstrapContext ctx) throws ResourceAdapterInternalException {
if (workManager != null)
throw new ResourceAdapterInternalException("Can only start once");
workManager = ctx.getWorkManager();
}
@Override
public void stop() {
workManager = null;
}
public static void deliver(String message) throws WorkException {
queue.add(message);
workManager.doWork(new Work() {
@Override
public void release() {
Thread.currentThread().interrupt();
}
@Override
public void run() {
try {
process();
} catch (UnavailableException e) {
throw new RuntimeException(e);
}
}
});
}
@Override
public void endpointActivation(MessageEndpointFactory endpointFactory, ActivationSpec spec) throws ResourceException {
endpointFactories.add(endpointFactory);
}
@Override
public void endpointDeactivation(MessageEndpointFactory endpointFactory, ActivationSpec spec) {
endpointFactories.remove(endpointFactory);
}
@Override
public XAResource[] getXAResources(ActivationSpec[] specs) throws ResourceException {
// no crash recovery
return null;
}
private static void process() throws UnavailableException {
if (endpointFactories.size() == 0)
return;
MessageEndpoint endpoint = endpointFactories.get(0).createEndpoint(null);
try {
while (!queue.isEmpty()) {
try {
String message = queue.poll(30, SECONDS);
try {
((PostmanPat) endpoint).deliver(message);
} catch (Throwable t) {
t.printStackTrace();
// ignore
}
} catch (InterruptedException e) {
return;
}
}
} finally {
endpoint.release();
}
}
}