/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.server.webapp;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.InjectionTarget;
import javax.servlet.ServletContextAttributeListener;
import javax.servlet.ServletContextListener;
import javax.servlet.ServletRequestAttributeListener;
import javax.servlet.ServletRequestListener;
import javax.servlet.http.HttpSessionActivationListener;
import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionListener;
import com.caucho.config.Config;
import com.caucho.config.ConfigException;
import com.caucho.config.Configurable;
import com.caucho.config.inject.InjectManager;
import com.caucho.config.program.ContainerProgram;
import com.caucho.config.types.DescriptionGroupConfig;
import com.caucho.util.L10N;
/**
* Configuration for the listener
*/
@Configurable
public class ListenerConfig<T> extends DescriptionGroupConfig {
static L10N L = new L10N(ListenerConfig.class);
// The listener class
private Class<T> _listenerClass;
// The listener object
private T _object;
private InjectionTarget<T> _target;
private ContainerProgram _init;
/**
* Sets the listener class.
*/
public void setListenerClass(Class<T> cl)
throws ConfigException
{
Config.checkCanInstantiate(cl);
if (ServletContextListener.class.isAssignableFrom(cl)) {
}
else if (ServletContextAttributeListener.class.isAssignableFrom(cl)) {
}
else if (ServletRequestListener.class.isAssignableFrom(cl)) {
}
else if (ServletRequestAttributeListener.class.isAssignableFrom(cl)) {
}
else if (HttpSessionListener.class.isAssignableFrom(cl)) {
}
else if (HttpSessionAttributeListener.class.isAssignableFrom(cl)) {
}
else if (HttpSessionActivationListener.class.isAssignableFrom(cl)) {
}
else
throw new ConfigException(L.l("listener-class '{0}' does not implement any web-app listener interface.",
cl.getName()));
_listenerClass = cl;
}
/**
* Gets the listener class.
*/
public Class<?> getListenerClass()
{
return _listenerClass;
}
/**
* Sets the init block
*/
public void setInit(ContainerProgram init)
{
_init = init;
}
/**
* Gets the init block
*/
public ContainerProgram getInit()
{
return _init;
}
/**
* Initialize.
*/
public Object createListenerObject()
throws Exception
{
if (_object != null)
return _object;
InjectManager cdiManager = InjectManager.create();
_target = cdiManager.createInjectionTarget(_listenerClass);
CreationalContext<T> env = cdiManager.createCreationalContext(null);
_object = _target.produce(env);
_target.inject(_object, env);
if (_init != null) {
// jsp/18n2
_init.configure(_object);
_init.init(_object);
}
_target.postConstruct(_object);
return _object;
}
public void destroy()
{
if (_target != null)
_target.preDestroy(_object);
}
public String toString()
{
return getClass().getSimpleName() + "[" + _listenerClass + "]";
}
}