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/*
 * 
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 2007-2008 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
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 * Header, with the fields enclosed by brackets [] replaced by your own
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package com.sun.grizzly.arp;

import com.sun.grizzly.http.SocketChannelOutputBuffer;
import java.io.IOException;
import com.sun.grizzly.tcp.Response;
import java.util.concurrent.locks.ReentrantLock;
import java.util.logging.Level;
import com.sun.grizzly.Buffer;
import com.sun.grizzly.Grizzly;

/**
 * Thread-Safe {@link SocketChannelOutputBuffer} used when Comet is used.
 */
public class AsynchronousOutputBuffer extends SocketChannelOutputBuffer{    

    private ReentrantLock byteBufferWriteLock;
    
    /**
     * Alternate constructor.
     */
    public AsynchronousOutputBuffer(Response response, 
            int headerBufferSize, boolean useSocketBuffer) {
        super(response,headerBufferSize, useSocketBuffer); 
        byteBufferWriteLock = new ReentrantLock();
    }

    
    @Override
    public void realWriteBytes(byte cbuf[], int off, int len) throws IOException {
        try{
            byteBufferWriteLock.lock();
            super.realWriteBytes(cbuf, off, len);
        } finally {
            byteBufferWriteLock.unlock();
        }
    }
    
     
    @Override
    public void flushChannel(Buffer bb) throws IOException{
        try{
            byteBufferWriteLock.lock();
            super.flushChannel(bb);
        } catch (IOException ex){
            // Swallow that exception as it just means the Response
            // object has been recycled and another asynchronous
            // operations was still occuring.
            String msg = ex.getMessage();
            if (msg!= null && !msg.startsWith("Illegal")){
                throw ex;
            } else {
                if (Grizzly.logger.isLoggable(Level.FINEST)){
                    Grizzly.logger.log(Level.FINEST,"",ex);
                }
            }
            
        } finally {
            byteBufferWriteLock.unlock();
        }            
    }

    @Override
    public void flush() throws IOException{
        try{
            byteBufferWriteLock.lock();        
            super.flush();
        } finally {
            byteBufferWriteLock.unlock();
        }        
    }

    @Override
    public void flushBuffer() throws IOException{
        try{
            byteBufferWriteLock.lock();
            super.flushBuffer();
        } finally {
            byteBufferWriteLock.unlock();
        }        
    }

 
}