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package com.sun.grizzly.nio.transport;

import com.sun.grizzly.Context;
import com.sun.grizzly.nio.AbstractNIOAsyncQueueWriter;
import com.sun.grizzly.nio.NIOTransport;
import java.io.IOException;
import java.net.SocketAddress;
import java.nio.channels.SelectionKey;
import java.util.concurrent.Future;
import com.sun.grizzly.Buffer;
import com.sun.grizzly.CompletionHandler;
import com.sun.grizzly.Connection;
import com.sun.grizzly.Interceptor;
import com.sun.grizzly.WriteResult;
import com.sun.grizzly.asyncqueue.AsyncQueueWriter;
import com.sun.grizzly.asyncqueue.MessageCloner;
import com.sun.grizzly.nio.NIOConnection;

/**
 * The TCP transport {@link AsyncQueueWriter} implementation, based on
 * the Java NIO
 *
 * @author Alexey Stashok
 */
public class TCPNIOAsyncQueueWriter extends AbstractNIOAsyncQueueWriter {

    public TCPNIOAsyncQueueWriter(NIOTransport transport) {
        super(transport);
    }

    @Override
    public Future> write(
            Connection connection, SocketAddress dstAddress, Buffer buffer,
            CompletionHandler> completionHandler,
            Interceptor interceptor,
            MessageCloner cloner) throws IOException {

        if (dstAddress != null) {
            throw new UnsupportedOperationException(
                    "Destination address should be null for TCP!");
        }
        
        return super.write(connection, null, buffer, completionHandler,
                interceptor, cloner);
    }
    
    protected int write0(Connection connection, SocketAddress dstAddress,
            Buffer buffer,
            WriteResult currentResult)
            throws IOException {
        return ((TCPNIOTransport) transport).write(connection, buffer, currentResult);
    }

    protected void onReadyToWrite(Connection connection) throws IOException {
        NIOConnection nioConnection = (NIOConnection) connection;

        transport.getSelectorHandler().registerKey(
                nioConnection.getSelectorRunner(),
                nioConnection.getSelectionKey(), SelectionKey.OP_WRITE);
    }

    public Context context() {
        return null;
    }

    public void beforeProcess(Context context) throws IOException {
    }

    public void afterProcess(Context context) throws IOException {
    }
}