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Commons Collections example source code file (SynchronizedBag.java)

This example Commons Collections source code file (SynchronizedBag.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 - Commons Collections tags/keywords

bag, bag, object, object, set, synchronizedbag, synchronizedbag, synchronizedbagset, synchronizedbagset, synchronizedcollection, synchronizedset, util

The Commons Collections SynchronizedBag.java source code

/*
 *  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.commons.collections.bag;

import java.util.Set;

import org.apache.commons.collections.Bag;
import org.apache.commons.collections.collection.SynchronizedCollection;
import org.apache.commons.collections.set.SynchronizedSet;

/**
 * Decorates another <code>Bag to synchronize its behaviour
 * for a multi-threaded environment.
 * <p>
 * Methods are synchronized, then forwarded to the decorated bag.
 * Iterators must be separately synchronized around the loop.
 * <p>
 * This class is Serializable from Commons Collections 3.1.
 *
 * @since Commons Collections 3.0
 * @version $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
 * 
 * @author Stephen Colebourne
 */
public class SynchronizedBag
        extends SynchronizedCollection implements Bag {

    /** Serialization version */
    private static final long serialVersionUID = 8084674570753837109L;

    /**
     * Factory method to create a synchronized bag.
     * 
     * @param bag  the bag to decorate, must not be null
     * @return a new synchronized Bag
     * @throws IllegalArgumentException if bag is null
     */
    public static Bag decorate(Bag bag) {
        return new SynchronizedBag(bag);
    }
    
    //-----------------------------------------------------------------------
    /**
     * Constructor that wraps (not copies).
     * 
     * @param bag  the bag to decorate, must not be null
     * @throws IllegalArgumentException if bag is null
     */
    protected SynchronizedBag(Bag bag) {
        super(bag);
    }

    /**
     * Constructor that wraps (not copies).
     * 
     * @param bag  the bag to decorate, must not be null
     * @param lock  the lock to use, must not be null
     * @throws IllegalArgumentException if bag is null
     */
    protected SynchronizedBag(Bag bag, Object lock) {
        super(bag, lock);
    }

    /**
     * Gets the bag being decorated.
     * 
     * @return the decorated bag
     */
    protected Bag getBag() {
        return (Bag) collection;
    }
    
    //-----------------------------------------------------------------------
    public boolean add(Object object, int count) {
        synchronized (lock) {
            return getBag().add(object, count);
        }
    }

    public boolean remove(Object object, int count) {
        synchronized (lock) {
            return getBag().remove(object, count);
        }
    }

    public Set uniqueSet() {
        synchronized (lock) {
            Set set = getBag().uniqueSet();
            return new SynchronizedBagSet(set, lock);
        }
    }

    public int getCount(Object object) {
        synchronized (lock) {
            return getBag().getCount(object);
        }
    }
    
    //-----------------------------------------------------------------------
    /**
     * Synchronized Set for the Bag class.
     */
    class SynchronizedBagSet extends SynchronizedSet {
        /**
         * Constructor.
         * @param set  the set to decorate
         * @param lock  the lock to use, shared with the bag
         */
        SynchronizedBagSet(Set set, Object lock) {
            super(set, lock);
        }
    }

}

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