Tomcat example source code file (BufferPool15Impl.java)

This example Tomcat source code file (BufferPool15Impl.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

atomicinteger, atomicinteger, bufferpool15impl, bufferpool15impl, concurrentlinkedqueue, concurrentlinkedqueue, threading, threads, xbytebuffer, xbytebuffer

The Tomcat BufferPool15Impl.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 java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicInteger;

/**
 *
 * @author Filip Hanik
 * @version 1.0
 */
class BufferPool15Impl implements BufferPool.BufferPoolAPI {
    protected int maxSize;
    protected AtomicInteger size = new AtomicInteger(0);
    protected ConcurrentLinkedQueue queue = new ConcurrentLinkedQueue();

    public void setMaxSize(int bytes) {
        this.maxSize = bytes;
    }


    public XByteBuffer getBuffer(int minSize, boolean discard) {
        XByteBuffer buffer = (XByteBuffer)queue.poll();
        if ( buffer != null ) size.addAndGet(-buffer.getCapacity());
        if ( buffer == null ) buffer = new XByteBuffer(minSize,discard);
        else if ( buffer.getCapacity() <= minSize ) buffer.expand(minSize);
        buffer.setDiscard(discard);
        buffer.reset();
        return buffer;
    }

    public void returnBuffer(XByteBuffer buffer) {
        if ( (size.get() + buffer.getCapacity()) <= maxSize ) {
            size.addAndGet(buffer.getCapacity());
            queue.offer(buffer);
        }
    }

    public void clear() {
        queue.clear();
        size.set(0);
    }

    public int getMaxSize() {
        return maxSize;
    }

}