org.glassfish.grizzly.nio.transport.UDPNIOAsyncQueueWriter Maven / Gradle / Ivy

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package org.glassfish.grizzly.nio.transport;

import org.glassfish.grizzly.asyncqueue.AsyncWriteQueueRecord;
import org.glassfish.grizzly.asyncqueue.WritableMessage;
import org.glassfish.grizzly.nio.NIOTransport;
import java.io.IOException;
import java.net.SocketAddress;
import org.glassfish.grizzly.IOEvent;
import org.glassfish.grizzly.asyncqueue.AsyncQueueWriter;
import org.glassfish.grizzly.asyncqueue.RecordWriteResult;
import org.glassfish.grizzly.nio.AbstractNIOAsyncQueueWriter;
import org.glassfish.grizzly.nio.NIOConnection;

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

    public UDPNIOAsyncQueueWriter(final NIOTransport transport) {
        super(transport);
    }

    @Override
    @SuppressWarnings("unchecked")
    protected RecordWriteResult write0(final NIOConnection connection,
            final AsyncWriteQueueRecord queueRecord) throws IOException {
        
        final RecordWriteResult writeResult =
                queueRecord.getCurrentResult();
        
        if (queueRecord.remaining() == 0) {
            return writeResult.lastWriteResult(0,
                    queueRecord.isUncountable()
                            ? AsyncWriteQueueRecord.UNCOUNTABLE_RECORD_SPACE_VALUE
                            : 0);
            
        }
        
        final WritableMessage outputMessage = queueRecord.getMessage();
        final SocketAddress dstAddress = (SocketAddress) queueRecord.getDstAddress();
        final long written = ((UDPNIOTransport) transport).write((UDPNIOConnection) connection,
                dstAddress, outputMessage, writeResult);
        
        return writeResult.lastWriteResult(written, written);
    }

    @Override
    protected final void onReadyToWrite(final NIOConnection connection) throws IOException {
        connection.enableIOEvent(IOEvent.WRITE);
    }
}