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

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package org.glassfish.grizzly.nio.transport;

import org.glassfish.grizzly.IOEvent;
import java.io.IOException;
import java.net.DatagramSocket;
import java.net.SocketAddress;
import java.nio.channels.DatagramChannel;
import java.nio.channels.SelectionKey;
import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.glassfish.grizzly.Connection;
import org.glassfish.grizzly.AbstractSocketConnectorHandler;
import org.glassfish.grizzly.impl.ReadyFutureImpl;
import org.glassfish.grizzly.nio.RegisterChannelResult;

/**
 * UDP NIO transport client side ConnectorHandler implementation
 * 
 * @author Alexey Stashok
 */
public class UDPNIOConnectorHandler extends AbstractSocketConnectorHandler {
    
    protected static final int DEFAULT_CONNECTION_TIMEOUT = 30000;
    
    protected boolean isReuseAddress;
    protected int connectionTimeout = DEFAULT_CONNECTION_TIMEOUT;

    public UDPNIOConnectorHandler(UDPNIOTransport transport) {
        super(transport);
        UDPNIOTransport nioTransport = (UDPNIOTransport) transport;
        connectionTimeout = nioTransport.getConnectionTimeout();
        isReuseAddress = nioTransport.isReuseAddress();
    }

    /**
     * Creates non-connected UDP {@link Connection}.
     *
     * @return non-connected UDP {@link Connection}.
     * @throws java.io.IOException
     */
    public Future connect() throws IOException {
        return connect(null, null);
    }

    @Override
    public Future connect(SocketAddress remoteAddress,
            SocketAddress localAddress) throws IOException {
        
        if (!transport.isBlocking()) {
            return connectAsync(remoteAddress, localAddress);
        } else {
            return connectSync(remoteAddress, localAddress);
        }
    }

    protected Future connectSync(SocketAddress remoteAddress,
            SocketAddress localAddress) throws IOException {
        Future future = connectAsync(remoteAddress, localAddress);
        waitNIOFuture(future);

        return future;
    }

    protected Future connectAsync(SocketAddress remoteAddress,
            SocketAddress localAddress) throws IOException {
        DatagramChannel datagramChannel = DatagramChannel.open();
        DatagramSocket socket = datagramChannel.socket();
        socket.setReuseAddress(isReuseAddress);
        
        if (localAddress != null) {
            socket.bind(localAddress);
        }

        datagramChannel.configureBlocking(false);

        UDPNIOTransport nioTransport = (UDPNIOTransport) transport;
        
        UDPNIOConnection newConnection = (UDPNIOConnection)
                nioTransport.obtainNIOConnection(datagramChannel);
        
        if (remoteAddress != null) {
            datagramChannel.connect(remoteAddress);
        }
        
        newConnection.setProcessor(defaultProcessor);
        newConnection.setProcessorSelector(defaultProcessorSelector);

        // if connected immediately - register channel on selector with OP_READ
        // interest
        Future registerChannelFuture =
                nioTransport.getNioChannelDistributor().
                registerChannelAsync(datagramChannel, SelectionKey.OP_READ,
                newConnection, null);

        // Wait until the SelectableChannel will be registered on the Selector
        RegisterChannelResult result = waitNIOFuture(registerChannelFuture);

        // make sure completion handler is called
        nioTransport.registerChannelCompletionHandler.completed(null, result);
        
        transport.fireIOEvent(IOEvent.CONNECTED, newConnection);
        
        return new ReadyFutureImpl(newConnection);
    }

    public boolean isReuseAddress() {
        return isReuseAddress;
    }

    public void setReuseAddress(boolean isReuseAddress) {
        this.isReuseAddress = isReuseAddress;
    }

    public int getConnectionTimeout() {
        return connectionTimeout;
    }

    public void setConnectionTimeout(int connectionTimeout) {
        this.connectionTimeout = connectionTimeout;
    }

    protected  E waitNIOFuture(Future future) throws IOException {
        try {
            return future.get(connectionTimeout, TimeUnit.MILLISECONDS);
        } catch (InterruptedException e) {
            throw new IOException("Connection was interrupted!");
        } catch (TimeoutException e) {
            throw new IOException("Channel registration on Selector timeout!");
        } catch (ExecutionException e) {
            Throwable internalException = e.getCause();
            if (internalException instanceof IOException) {
                throw (IOException) internalException;
            } else {
                throw new IOException("Unexpected exception connection exception. " +
                        internalException.getClass().getName() + ": " +
                        internalException.getMessage());
            }
        } catch (CancellationException e) {
            throw new IOException("Connection was cancelled!");
        }
    }
}