/******************************************************************************
* JBoss, a division of Red Hat *
* Copyright 2008, Red Hat Middleware, LLC, and individual *
* contributors as indicated by the @authors tag. See the *
* copyright.txt 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.gatein.pc.portlet.impl.container;
import org.gatein.common.logging.LoggerFactory;
import org.gatein.pc.portlet.container.managed.ManagedObject;
import org.gatein.pc.portlet.container.managed.LifeCycleStatus;
import org.gatein.pc.portlet.container.managed.ManagedObjectRegistryEventListener;
import org.gatein.pc.portlet.container.managed.ManagedObjectLifeCycleEvent;
import org.gatein.common.logging.Logger;
import java.util.Set;
import java.util.HashSet;
/**
* @author <a href="mailto:julien@jboss.org">Julien Viet</a>
* @version $Revision: 630 $
*/
public abstract class LifeCycle implements ManagedObject
{
/** . */
private Logger log = LoggerFactory.getLogger(LifeCycle.class);
/** . */
private LifeCycleStatus status = LifeCycleStatus.STOPPED;
/** Cheap reentrancy detection. */
private boolean active = false;
public final LifeCycleStatus getStatus()
{
return status;
}
private static final ThreadLocal<Set<Object>> faileds = new ThreadLocal<Set<Object>>();
public synchronized final void managedStart() throws IllegalStateException
{
if (active)
{
throw new IllegalStateException("Reentrancy detected");
}
//
active = true;
//
boolean clearFaileds = false;
//
try
{
if (faileds.get() == null)
{
clearFaileds = true;
faileds.set(new HashSet<Object>());
}
else if (faileds.get().contains(this))
{
return;
}
//
LifeCycleStatus previousStatus = status;
//
if (status != LifeCycleStatus.STARTED)
{
LifeCycleStatus status = LifeCycleStatus.FAILED;
try
{
invokeStart();
status = LifeCycleStatus.STARTED;
}
catch (DependencyNotResolvedException ignore)
{
status = LifeCycleStatus.STOPPED;
}
catch (Exception e)
{
log.error("Cannot start object", e);
}
catch (Error e)
{
log.error("Cannot start object", e);
}
finally
{
this.status = status;
//
if (status == LifeCycleStatus.FAILED)
{
faileds.get().add(this);
}
}
}
//
if (status != previousStatus)
{
getListener().onEvent(new ManagedObjectLifeCycleEvent(this, status));
}
//
if (status == LifeCycleStatus.STARTED)
{
startDependents();
}
}
finally
{
if (clearFaileds)
{
faileds.set(null);
}
//
active = false;
}
}
public synchronized final void managedStop()
{
if (active)
{
throw new IllegalStateException("Reentrancy detected");
}
//
active = true;
//
try
{
stopDependents();
//
if (status == LifeCycleStatus.STARTED)
{
try
{
invokeStop();
}
catch (Exception e)
{
log.error("Error during object stop", e);
}
catch (Error e)
{
log.error("Error during object stop", e);
}
finally
{
status = LifeCycleStatus.STOPPED;
}
//
getListener().onEvent(new ManagedObjectLifeCycleEvent(this, LifeCycleStatus.STOPPED));
}
}
finally
{
active = false;
}
}
protected void startDependents()
{
}
protected void stopDependents()
{
}
protected abstract void invokeStart() throws Exception;
protected abstract void invokeStop();
protected abstract ManagedObjectRegistryEventListener getListener();
}