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   * Copyright (c) 2007-2010 Oracle and/or its affiliates. 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
  * or packager/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 packager/legal/LICENSE.txt.
  * GPL Classpath Exception:
  * Oracle designates this particular file as subject to the "Classpath"
  * exception as provided by Oracle in the GPL Version 2 section of the License
  * file that accompanied this code.
  * Modifications:
  * If applicable, add the following below the License Header, with the fields
  * enclosed by brackets [] replaced by your own identifying information:
  * "Portions Copyright [year] [name of copyright owner]"
  * Contributor(s):
  * If you wish your version of this file to be governed by only the CDDL or
  * only the GPL Version 2, indicate your decision by adding "[Contributor]
  * elects to include this software in this distribution under the [CDDL or GPL
  * Version 2] license."  If you don't indicate a single choice of license, a
  * recipient has the option to distribute your version of this file under
  * either the CDDL, the GPL Version 2 or to extend the choice of license to
  * its licensees as provided above.  However, if you add GPL Version 2 code
  * and therefore, elected the GPL Version 2 license, then the option applies
  * only if the new code is made subject to such option by the copyright
  * holder.
 package com.sun.enterprise.web.connector.grizzly.comet;
Non blocking IO reader. This class can be used from a CometHandler to execute non blocking read. This is usefull when the client is pipelining data. The CometHandler will be notified as soon as bytes are arriving. CometHandler who wants to be notified just need to register themself by calling CometContext.registerAsyncRead()

Jeanfrancois Arcand
 public class CometReader {
The non blocking channel.
     private SocketChannel socketChannel;
The ByteBuffer used to execute the first read in CometTask.
     private ByteBuffer byteBuffer;
How many bytes have we read.
     private int nRead = 0;
Is this CometReader ready
     private boolean ready = true;
     public CometReader() {

Set the underlying SocketChannel.
     protected void setChannel(SocketChannel socketChannel){      
         this. = socketChannel;
Read bytes without blocking.
     public int read(byte[] bufthrows IOException {
         return read(buf,0,buf.length);

Read bytes without blocking.
    public int read(byte[] bufint offint lenthrows IOException {
        if (!){
            throw new IllegalStateException("This CometReader is no longer usable");
        // The CometTask has already read the first bytes for us.
        if ( != null){           
            return  > len ? len : ;
        return .read(ByteBuffer.wrap(buf,off,len));
Recycle this object.
    public void recycle(){
         = 0;
         = null;
         = null;
    public void setByteBuffer(ByteBuffer byteBuffer) {
        this. = byteBuffer;
    public void setNRead(int nRead) {
        this. = nRead;

Return true if this instance is ready to read.
    public boolean isReady() {
        return ;

false if this instance is no longer ready to read.
    public void setReady(boolean ready) {
        this. = ready;
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