/* | |
* Licensed to the Apache Software Foundation (ASF) under one | |
* or more contributor license agreements. See the NOTICE file | |
* distributed with this work for additional information | |
* regarding copyright ownership. The ASF licenses this file | |
* to you under the Apache License, Version 2.0 (the | |
* "License"); you may not use this file except in compliance | |
* with the License. You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, | |
* software distributed under the License is distributed on an | |
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
* KIND, either express or implied. See the License for the | |
* specific language governing permissions and limitations | |
* under the License. | |
*/ | |
package org.apache.myfaces.extensions.validator.core.startup; | |
import org.apache.myfaces.extensions.validator.util.JsfUtils; | |
import org.apache.myfaces.extensions.validator.internal.UsageInformation; | |
import org.apache.myfaces.extensions.validator.internal.UsageCategory; | |
import org.apache.commons.logging.LogFactory; | |
import org.apache.commons.logging.Log; | |
import javax.faces.event.PhaseEvent; | |
import javax.faces.event.PhaseId; | |
import javax.faces.event.PhaseListener; | |
import java.util.ArrayList; | |
import java.util.List; | |
/** | |
* In order to execute logic just once. | |
* e.g. register artifacts via api | |
* | |
* @author Gerhard Petracek | |
* @since 1.x.1 | |
*/ | |
@UsageInformation(UsageCategory.REUSE) | |
public abstract class AbstractStartupListener implements PhaseListener | |
{ | |
protected final Log logger = LogFactory.getLog(getClass()); | |
//don't remove - it's a fallback if there is a problem with deregistration | |
//target: don't process init logic more than once | |
private static List<Class> initializedListeners = new ArrayList<Class>(); | |
protected AbstractStartupListener() | |
{ | |
if(logger.isDebugEnabled()) | |
{ | |
logger.debug(getClass().getName() + " instantiated"); | |
} | |
} | |
public void afterPhase(PhaseEvent event) | |
{ | |
} | |
public void beforePhase(PhaseEvent event) | |
{ | |
synchronized (AbstractStartupListener.class) | |
{ | |
if (!initializedListeners.contains(getClass())) | |
{ | |
try | |
{ | |
if(logger.isInfoEnabled()) | |
{ | |
logger.info("start init of " + getClass().getName()); | |
} | |
try | |
{ | |
init(); | |
if(logger.isInfoEnabled()) | |
{ | |
logger.info("init of " + getClass().getName() + " finished"); | |
} | |
} | |
finally | |
{ | |
JsfUtils.deregisterPhaseListener(this); | |
} | |
} | |
catch (Throwable t) | |
{ | |
if(logger.isWarnEnabled()) | |
{ | |
logger.warn("an exception occurred while deregistering the phase-listener" | |
+ getClass().getName() | |
+ " -> there is just a little overhead," | |
+ " but everything else works correctly." | |
+ " however, please inform the community about your configuration", t); | |
} | |
} | |
finally | |
{ | |
initializedListeners.add(getClass()); | |
} | |
} | |
} | |
} | |
public PhaseId getPhaseId() | |
{ | |
return PhaseId.RESTORE_VIEW; | |
} | |
protected abstract void init(); | |
} |