Jetty example source code file (LifeCycleCallbackCollection.java)

This example Jetty source code file (LifeCycleCallbackCollection.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Jetty tags/keywords

arraylist, exception, exception, hashmap, hashmap, illegalargumentexception, lifecyclecallback, lifecyclecallbackcollection, list, list, map, object, object, postconstructcallback, util

The Jetty LifeCycleCallbackCollection.java source code

//========================================================================
//$Id: LifeCycleCallbackCollection.java 1540 2007-01-19 12:24:10Z janb $
//Copyright 2006 Mort Bay Consulting Pty. Ltd.
//------------------------------------------------------------------------
//Licensed 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.mortbay.jetty.plus.annotation;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.mortbay.log.Log;


/**
 * LifeCycleCallbackCollection
 *
 *
 */
public class LifeCycleCallbackCollection
{
    private HashMap postConstructCallbacksMap = new HashMap();
    private HashMap preDestroyCallbacksMap = new HashMap();
    
    
 
    
    
    /**
     * Add a Callback to the list of callbacks.
     * 
     * @param callback
     */
    public void add (LifeCycleCallback callback)
    {
        if ((callback==null) || (callback.getTargetClass()==null) || (callback.getTarget()==null))
            return;

        if (Log.isDebugEnabled())
            Log.debug("Adding callback for class="+callback.getTargetClass()+ " on "+callback.getTarget());
        Map map = null;
        if (callback instanceof PreDestroyCallback)
            map = preDestroyCallbacksMap;
        if (callback instanceof PostConstructCallback)
            map = postConstructCallbacksMap;

        if (map == null)
            throw new IllegalArgumentException ("Unsupported lifecycle callback type: "+callback);

     
        List callbacks = (List)map.get(callback.getTargetClass());
        if (callbacks==null)
        {
            callbacks = new ArrayList();
            map.put(callback.getTargetClass(), callbacks);
        }
       
        //don't add another callback for exactly the same method
        if (!callbacks.contains(callback))
            callbacks.add(callback);
    }

    
    /**
     * Call the method, if one exists, that is annotated with PostConstruct
     * or with <post-construct> in web.xml
     * @param o the object on which to attempt the callback
     * @throws Exception
     */
    public void callPostConstructCallback (Object o)
    throws Exception
    {
        if (o == null)
            return;
        
        List callbacks = (List)postConstructCallbacksMap.get(o.getClass());
        
        if (callbacks == null)
            return;
        
        for (int i=0;i<callbacks.size();i++)
            ((LifeCycleCallback)callbacks.get(i)).callback(o);
    }
    
    
    /**
     * Call the method, if one exists, that is annotated with PreDestroy
     * or with <pre-destroy> in web.xml
     * @param o the object on which to attempt the callback
     */
    public void callPreDestroyCallback (Object o)
    throws Exception
    {
        if (o == null)
            return;

        List callbacks = (List)preDestroyCallbacksMap.get(o.getClass());
        if (callbacks == null)
            return;
        
        for (int i=0;i<callbacks.size();i++)
            ((LifeCycleCallback)callbacks.get(i)).callback(o);
    }
}