001/*****************************************************************************
002 * Copyright (C) PicoContainer Organization. All rights reserved.            *
003 * ------------------------------------------------------------------------- *
004 * The software in this package is published under the terms of the BSD      *
005 * style license a copy of which has been included with this distribution in *
006 * the LICENSE.txt file.                                                     *
007 *                                                                           *
008 * Original code by                                                          *
009 *****************************************************************************/
010package org.picocontainer.behaviors;
011
012
013import org.picocontainer.ComponentAdapter;
014import org.picocontainer.PicoContainer;
015import org.picocontainer.PicoCompositionException;
016
017import java.util.concurrent.locks.Lock;
018import java.util.concurrent.locks.ReentrantLock;
019import java.lang.reflect.Type;
020
021/**
022 * @author Paul Hammant
023 */
024@SuppressWarnings("serial")
025public class Locked<T> extends AbstractBehavior<T> {
026        
027        /**
028         * Reentrant lock.
029         */
030        private Lock lock = new ReentrantLock();
031
032    public Locked(ComponentAdapter<T> delegate) {
033        super(delegate);
034    }
035
036    public T getComponentInstance(PicoContainer container, Type into) throws PicoCompositionException {
037        T retVal = null;
038        lock.lock();
039        try {
040          retVal = super.getComponentInstance(container, into);
041        }
042        finally {
043          lock.unlock();
044        }
045        return retVal;
046    }
047
048    public String getDescriptor() {
049        return "Locked";
050    }
051
052}