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Tomcat example source code file (

This example Tomcat source code file ( is included in the "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 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

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("");
                       pool = (BufferPoolAPI)clazz.newInstance();
                   } catch ( Throwable x ) {
                       try {
                           clazz = Class.forName("");
                           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);
         "Created a buffer pool with max size:"+DEFAULT_POOL_SIZE+" bytes of type:"+(clazz!=null?clazz.getName():"null"));
                   instance = new BufferPool(pool);
                }//end if
        }//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 source code file:

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