/*
* ============================================================================
* GNU Lesser General Public License
* ============================================================================
*
* Beanlet - JSE Application Container.
* Copyright (C) 2006 Leon van Zantvoort
*
* This library 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 library 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 library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*
* Leon van Zantvoort
* 243 Acalanes Drive #11
* Sunnyvale, CA 94086
* USA
*
* zantvoort@users.sourceforge.net
* http://beanlet.org
*/
package org.beanlet.impl;
import static org.beanlet.RetentionPolicy.*;
import org.beanlet.RetentionPolicy;
import org.jargo.ComponentEventException;
import org.jargo.ComponentExecutionException;
import org.jargo.Event;
import org.jargo.EventExecutor;
import org.jargo.ComponentObject;
import org.jargo.ComponentObjectFactory;
import org.jargo.ComponentObjectPool;
/**
*
* @author Leon van Zantvoort
*/
public final class BeanletEventExecutorImpl<T> implements EventExecutor<T> {
private final String componentName;
private final RetentionPolicy retentionPolicy;
private final Class<? extends Throwable>[] exceptionType;
public BeanletEventExecutorImpl(String componentName,
RetentionPolicy retentionPolicy,
Class<? extends Throwable>[] exceptionType) {
this.componentName = componentName;
this.retentionPolicy = retentionPolicy;
this.exceptionType = exceptionType.clone();
}
@SuppressWarnings("unchecked") // b/c of bug in the compiler.
public Object execute(Event event, ComponentObjectFactory<T> factory)
throws ComponentEventException {
ComponentObject<T> componentObject = factory.getComponentObject();
if (componentObject == null) {
throw new ComponentEventException(componentName, event,
"No instance available.");
}
Throwable t = null;
try {
return componentObject.execute(event);
} catch (ComponentExecutionException e) {
t = e.getCause();
assert t != null;
throw e;
} finally {
if (factory instanceof ComponentObjectPool) {
ComponentObjectPool<T> pool = (ComponentObjectPool<T>) factory;
boolean discard = false;
if (retentionPolicy != RETAIN && t != null) {
for (Class c : exceptionType) {
if (c.isAssignableFrom(t.getClass())) {
discard = true;
break;
}
}
}
if (discard) {
pool.discardComponentObject(componentObject);
} else {
pool.freeComponentObject(componentObject);
}
}
}
}
}