    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     *****************************************************************************/
    010    package org.picocontainer.behaviors;
    011
    012
    013    import org.picocontainer.ComponentAdapter;
    014    import org.picocontainer.PicoContainer;
    015    import org.picocontainer.PicoCompositionException;
    016
    017    import java.util.concurrent.locks.Lock;
    018    import java.util.concurrent.locks.ReentrantLock;
    019    import java.lang.reflect.Type;
    020
    021    /**
    022     * @author Paul Hammant
    023     */
    024    @SuppressWarnings("serial")
    025    public 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    }