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package com.sun.grizzly.async;

import com.sun.grizzly.BaseSelectionKeyHandler;
import com.sun.grizzly.SelectionKeyHandler;
import com.sun.grizzly.SelectorHandler;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.WritableByteChannel;
import java.net.SocketAddress;
import java.nio.channels.DatagramChannel;
import java.nio.channels.SelectableChannel;

/**
 * UDP implementation of {@link AsyncQueueWriter}
 *
 * @author Alexey Stashok
 */
public class UDPAsyncQueueWriter extends AbstractAsyncQueueWriter {

    public UDPAsyncQueueWriter(SelectorHandler selectorHandler) {
        super(selectorHandler);
    }
    
    protected OperationResult doWrite(WritableByteChannel channel,
            SocketAddress dstAddress, ByteBuffer byteBuffer,
            OperationResult dstResult) throws IOException {

        int written = 0;
        int lastWriteBytes = -1;
        try{
            do {
                if (dstAddress != null) {
                    lastWriteBytes = ((DatagramChannel) channel).send(byteBuffer, dstAddress);
                } else {
                    lastWriteBytes = channel.write(byteBuffer);
                }

                if (lastWriteBytes > 0) {
                    written += lastWriteBytes;
                }

            } while(lastWriteBytes > 0 && byteBuffer.hasRemaining());
        } catch (IOException ex){
            lastWriteBytes = -1;
            throw ex;
        } finally {
             if (lastWriteBytes == -1){
                SelectionKeyHandler skh = selectorHandler.getSelectionKeyHandler();
                if (skh instanceof BaseSelectionKeyHandler){                  
                    ((BaseSelectionKeyHandler)skh).notifyRemotlyClose(
                            selectorHandler.keyFor((SelectableChannel)channel));
                }               
            }           
        }

        dstResult.bytesProcessed = written;
        return dstResult;
    }    
}