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Tomcat example source code file (BufferPool.java)

This example Tomcat source code file (BufferPool.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 - Tomcat tags/keywords

bufferpool, bufferpool, bufferpoolapi, bufferpoolapi, class, created, default_pool_size, default_pool_size, log, throwable, unable, xbytebuffer, xbytebuffer

The Tomcat BufferPool.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.catalina.tribes.io;


import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;

/**
 *
 * @author Filip Hanik
 * 
 * @version 1.0
 */
public class BufferPool {
    protected static Log log = LogFactory.getLog(BufferPool.class);

    public static int DEFAULT_POOL_SIZE = 100*1024*1024; //100MB



    protected static volatile BufferPool instance = null;
    protected BufferPoolAPI pool = null;

    private BufferPool(BufferPoolAPI pool) {
        this.pool = pool;
    }

    public XByteBuffer getBuffer(int minSize, boolean discard) {
        if ( pool != null ) return pool.getBuffer(minSize, discard);
        else return new XByteBuffer(minSize,discard);
    }

    public void returnBuffer(XByteBuffer buffer) {
        if ( pool != null ) pool.returnBuffer(buffer);
    }

    public void clear() {
        if ( pool != null ) pool.clear();
    }


    public static BufferPool getBufferPool() {
        if (  (instance == null) ) {
            synchronized (BufferPool.class) {
                if ( instance == null ) {
                   BufferPoolAPI pool = null;
                   Class clazz = null;
                   try {
                       clazz = Class.forName("org.apache.catalina.tribes.io.BufferPool15Impl");
                       pool = (BufferPoolAPI)clazz.newInstance();
                   } catch ( Throwable x ) {
                       try {
                           clazz = Class.forName("org.apache.catalina.tribes.io.BufferPool14Impl");
                           pool = (BufferPoolAPI)clazz.newInstance();
                       } catch ( Throwable e ) {
                           log.warn("Unable to initilize BufferPool, not pooling XByteBuffer objects:"+x.getMessage());
                           if ( log.isDebugEnabled() ) log.debug("Unable to initilize BufferPool, not pooling XByteBuffer objects:",x);
                       }
                   }
                   pool.setMaxSize(DEFAULT_POOL_SIZE);
                   log.info("Created a buffer pool with max size:"+DEFAULT_POOL_SIZE+" bytes of type:"+(clazz!=null?clazz.getName():"null"));
                   instance = new BufferPool(pool);
                }//end if
            }//sync
        }//end if
        return instance;
    }


    public static interface BufferPoolAPI {
        public void setMaxSize(int bytes);

        public XByteBuffer getBuffer(int minSize, boolean discard);

        public void returnBuffer(XByteBuffer buffer);

        public void clear();
    }    
}

Other Tomcat examples (source code examples)

Here is a short list of links related to this Tomcat BufferPool.java source code file:

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