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Apache CXF example source code file (PooledFactory.java)

This example Apache CXF source code file (PooledFactory.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 - Apache CXF tags/keywords

arrayblockingqueue, blockingqueue, class, factory, factory, object, object, perrequestfactory, pooledfactory, pooledfactory, threading, threads, throwable, throwable, util

The Apache CXF PooledFactory.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.cxf.service.invoker;

import java.util.Collection;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;

import org.apache.cxf.message.Exchange;

/**
 * Factory the maintains a pool of instances that are used.
 * 
 * Can optionally create more instances than the size of the queue
 */
public class PooledFactory implements Factory {
    BlockingQueue<Object> pool;
    Factory factory;
    int count;
    int max;
    boolean createMore;

    /**
     * Pool of instances of the svcClass
     * @param svcClass the class to create
     * @param max the absolute maximum number to create and pool
     */
    public PooledFactory(final Class svcClass, int max) {
        this(new PerRequestFactory(svcClass), max, false);
    }
    /**
     * Pool of instances contructed from the given factory
     * @param factory
     * @param max the absolute maximum number to create and pool
     */
    public PooledFactory(final Factory factory, int max) {
        this(factory, max, false);
    }

    /**
     * Pool of instances contructed from the given factory
     * @param factory
     * @param max the absolute maximum number to create and pool
     * @param createMore If the pool is empty, but max objects have already 
     * been constructed, should more be constructed on a per-request basis (and 
     * then discarded when done) or should requests block until instances are 
     * released back into the pool. 
     */
    public PooledFactory(final Factory factory, int max, boolean createMore) {
        this.factory = factory;
        if (max < 1) {
            max = 16;
        }
        pool = new ArrayBlockingQueue<Object>(max, true);
        this.max = max;
        this.count = 0;
        this.createMore = createMore;
    }
    
    /**
     * Pool constructed from the give Collection of objects. 
     * @param objs The collection of objects to pre-polulate the pool
     */
    public PooledFactory(Collection<Object> objs) {
        pool = new ArrayBlockingQueue<Object>(objs.size(), true);
        pool.addAll(objs);
    }

    /** {@inheritDoc}*/
    public Object create(Exchange ex) throws Throwable {
        if (factory == null 
            || ((count >= max) && !createMore)) {
            return pool.take();
        }
        Object o = pool.poll();
        if (o == null) {
            return createObject(ex);
        }
        return o;
    }
    protected synchronized Object createObject(Exchange e) throws Throwable {
        //recheck the count/max stuff now that we're in a sync block
        if (factory == null 
            || ((count >= max) && !createMore)) {
            return pool.take();
        }
        
        count++;
        return factory.create(e);        
    }

    /** {@inheritDoc}*/
    public void release(Exchange ex, Object o) {
        pool.offer(o);
    }

}

Other Apache CXF examples (source code examples)

Here is a short list of links related to this Apache CXF PooledFactory.java source code file:

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