/*
* JBoss, Home of Professional Open Source.
* Copyright 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.test.integration.ejb.singleton.reentrant;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import javax.annotation.Resource;
import javax.ejb.Lock;
import javax.ejb.LockType;
import javax.ejb.SessionContext;
import javax.ejb.Singleton;
import org.jboss.logging.Logger;
@Singleton
public class SingletonBean {
private static final Logger log = Logger.getLogger(SingletonBean.class);
private static final int METHOD_WAIT_MS = 2000;
private static final int AWAIT_TIME_S = 2;
private Integer called = 0;
@Resource
SessionContext ctx;
@Lock(LockType.WRITE)
public Integer methodWithWriteLock(CountDownLatch downMe, CountDownLatch waitingForOther) throws Exception {
log.trace("methodwith write lock is here!");
downMe.countDown();
if (waitingForOther != null) {
waitingForOther.await(AWAIT_TIME_S, TimeUnit.SECONDS);
SingletonBean bean = (SingletonBean) ctx.lookup("java:module/" + SingletonBean.class.getSimpleName());
bean.reentrantRead();
bean.reentrantWrite();
}
log.trace("methodWithWriteLock [" + called + "]");
return new Integer(++called);
}
@Lock(LockType.READ)
public Integer methodWithReadLock(CountDownLatch waitingForOther) throws Exception {
waitingForOther.await(AWAIT_TIME_S, TimeUnit.SECONDS);
SingletonBean bean = (SingletonBean) ctx.lookup("java:module/" + SingletonBean.class.getSimpleName());
bean.reentrantRead();
log.trace("methodWithReadLock [" + called + "]");
return new Integer(++called);
}
@Lock(LockType.READ)
public Integer methodWithReadLockException() throws Exception {
SingletonBean bean = (SingletonBean) ctx.lookup("java:module/" + SingletonBean.class.getSimpleName());
bean.reentrantWrite();
log.trace("This should not occur [" + called + "]");
return new Integer(++called);
}
@Lock(LockType.READ)
public void reentrantRead() throws InterruptedException {
// sleeping to other thread would have change for action
Thread.sleep(METHOD_WAIT_MS);
}
@Lock(LockType.WRITE)
public void reentrantWrite() throws InterruptedException {
// sleeping to other thread would have change for action
Thread.sleep(METHOD_WAIT_MS);
}
public void resetCalled() {
called = 0;
}
public Integer getCalled() {
return called;
}
}