Janitor.java example

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/*
 * Copyright 2003-2007 the original author or authors.
 *
 * 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.codehaus.groovy.control;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

/**
 *  An agent that can be used to defer cleanup operations to 
 *  a later time.  Users much implement the HasCleanup interface.  
 *
 *  @author <a href="mailto:cpoirier@dreaming.org">Chris Poirier</a>
 *
 *  @version $Id$
 */

public class Janitor implements HasCleanup
{
    private final Set pending = new HashSet();   // All objects pending cleanup
    
    public void register( HasCleanup object )
    {
        pending.add( object );
    }
    
    public void cleanup()
    {
        Iterator iterator = pending.iterator();
        while( iterator.hasNext() )
        {
            HasCleanup object = (HasCleanup)iterator.next();
            
            try { object.cleanup(); } catch( Exception e ) {
                // Ignore
            }
        }
        
        pending.clear();
    }
}