com.sun.grizzly.async.UDPAsyncQueueReader Maven / Gradle / Ivy

Go to download
/*
 * 
 * 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
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [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.grizzly.async;

import com.sun.grizzly.SelectorHandler;
import java.io.IOException;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.DatagramChannel;
import java.nio.channels.ReadableByteChannel;

/**
 *
 * @author Alexey Stashok
 */
public class UDPAsyncQueueReader extends AbstractAsyncQueueReader {

    public UDPAsyncQueueReader(SelectorHandler selectorHandler) {
        super(selectorHandler);
    }

    protected OperationResult doRead(ReadableByteChannel channel,
            ByteBuffer byteBuffer, AsyncQueueDataProcessor readPostProcessor,
            OperationResult dstResult) throws IOException {
        
        if (readPostProcessor != null) {
            ByteBuffer inputByteBuffer = readPostProcessor.getInternalByteBuffer();
            doRead(channel, inputByteBuffer, dstResult);
            if (dstResult.address != null) {
                readPostProcessor.process(byteBuffer);
            }
            
            return dstResult;
        } else {
            return doRead(channel, byteBuffer, dstResult);
        }
    }
    
    private OperationResult doRead(ReadableByteChannel channel,
            ByteBuffer byteBuffer, OperationResult dstResult)
            throws IOException {

        int pos = byteBuffer.position();
        SocketAddress address = ((DatagramChannel) channel).receive(byteBuffer);

        dstResult.address = address;
        dstResult.bytesProcessed = byteBuffer.position() - pos;
        return dstResult;
    }
}