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package com.sun.grizzly.nio.transport;

import com.sun.grizzly.Context;
import com.sun.grizzly.asyncqueue.*;
import com.sun.grizzly.nio.AbstractNIOAsyncQueueReader;
import com.sun.grizzly.nio.NIOTransport;
import java.io.IOException;
import java.net.SocketAddress;
import java.nio.channels.SelectionKey;
import com.sun.grizzly.Buffer;
import com.sun.grizzly.CompletionHandler;
import com.sun.grizzly.Connection;
import com.sun.grizzly.Interceptor;
import com.sun.grizzly.ReadResult;
import com.sun.grizzly.impl.FutureImpl;
import com.sun.grizzly.nio.NIOConnection;

/**
 * The UDP transport {@link AsyncQueueReader} implementation, based on
 * the Java NIO
 *
 * @author Alexey Stashok
 */
public class UDPNIOAsyncQueueReader extends AbstractNIOAsyncQueueReader {
    public UDPNIOAsyncQueueReader(NIOTransport transport) {
        super(transport);
    }

    @Override
    protected int read0(Connection connection, Buffer buffer,
            ReadResult currentResult) throws IOException {
        return ((UDPNIOTransport) transport).read(connection, buffer,
                currentResult);
    }

    protected void addRecord(Connection connection,
            Buffer buffer,
            CompletionHandler completionHandler,
            Interceptor interceptor) {
        AsyncReadQueueRecord record = new AsyncReadQueueRecord();
        record.set(buffer, new FutureImpl(),
                new ReadResult(connection),
                completionHandler, interceptor);
        ((TCPNIOConnection) connection).getAsyncReadQueue().getQueue().add(record);
    }

    @Override
    protected void onReadyToRead(Connection connection) throws IOException {
        NIOConnection nioConnection = (NIOConnection) connection;

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

    public Context context() {
        return null;
    }

    public void beforeProcess(Context context) throws IOException {
    }

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