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package com.sun.grizzly;
import com.sun.grizzly.async.UDPAsyncQueueReader;
import com.sun.grizzly.async.UDPAsyncQueueWriter;
import com.sun.grizzly.util.CallbackHandlerSelectionKeyAttachment;
import com.sun.grizzly.util.Copyable;
import com.sun.grizzly.util.SelectionKeyOP;
import com.sun.grizzly.util.State;
import java.io.IOException;
import java.net.BindException;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.net.SocketException;
import java.nio.channels.DatagramChannel;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.util.concurrent.Callable;
import java.util.logging.Level;
/**
* A SelectorHandler handles all java.nio.channels.Selector operations.
* One or more instance of a Selector are handled by SelectorHandler.
* The logic for processing of SelectionKey interest (OP_ACCEPT,OP_READ, etc.)
* is usually defined using an instance of SelectorHandler.
*
* This class represent a UDP implementation of a SelectorHandler.
* This class first bind a datagramSocketChannel to a UDP port and then start
* waiting for NIO events.
*
* @author Jeanfrancois Arcand
*/
public class UDPSelectorHandler extends TCPSelectorHandler {
private final static String NOT_SUPPORTED =
"Not supported by this SelectorHandler";
/**
* The datagramSocket instance.
*/
protected DatagramSocket datagramSocket;
/**
* The DatagramChannel.
*/
protected DatagramChannel datagramChannel;
public UDPSelectorHandler() {
this(Role.CLIENT_SERVER);
}
public UDPSelectorHandler(boolean isClient) {
this(boolean2Role(isClient));
}
public UDPSelectorHandler(Role role) {
super(role);
}
@Override
public void copyTo(Copyable copy) {
super.copyTo(copy);
UDPSelectorHandler copyHandler = (UDPSelectorHandler) copy;
copyHandler.datagramSocket = datagramSocket;
copyHandler.datagramChannel= datagramChannel;
}
/**
* Before invoking Selector.select(), make sure the ServerScoketChannel
* has been created. If true, then register all SelectionKey to the Selector.
*/
@Override
public void preSelect(Context ctx) throws IOException {
initOpRegistriesIfRequired();
if (asyncQueueReader == null) {
asyncQueueReader = new UDPAsyncQueueReader(this);
}
if (asyncQueueWriter == null) {
asyncQueueWriter = new UDPAsyncQueueWriter(this);
}
if (selector == null){
try{
isShutDown.set(false);
connectorInstanceHandler = new ConnectorInstanceHandler.
ConcurrentQueueDelegateCIH(
getConnectorInstanceHandlerDelegate());
datagramChannel = DatagramChannel.open();
selector = Selector.open();
if (role != Role.CLIENT){
datagramSocket = datagramChannel.socket();
datagramSocket.setReuseAddress(reuseAddress);
if (inet == null)
datagramSocket.bind(new InetSocketAddress(port));
else
datagramSocket.bind(new InetSocketAddress(inet,port));
datagramChannel.configureBlocking(false);
datagramChannel.register( selector, SelectionKey.OP_READ );
datagramSocket.setSoTimeout(serverTimeout);
}
ctx.getController().notifyReady();
} catch (SocketException ex){
throw new BindException(ex.getMessage() + ": " + port);
}
} else {
processPendingOperations(ctx);
}
}
/**
* Handle new OP_CONNECT ops.
*/
@Override
protected void onConnectOp(Context ctx,
SelectionKeyOP.ConnectSelectionKeyOP selectionKeyOp) throws IOException {
SocketAddress remoteAddress = selectionKeyOp.getRemoteAddress();
SocketAddress localAddress = selectionKeyOp.getLocalAddress();
CallbackHandler callbackHandler = selectionKeyOp.getCallbackHandler();
final DatagramChannel datagramChannel = DatagramChannel.open();
datagramChannel.socket().setReuseAddress(reuseAddress);
if (localAddress != null) {
datagramChannel.socket().bind(localAddress);
}
datagramChannel.configureBlocking(false);
datagramChannel.connect(remoteAddress);
SelectionKey key = datagramChannel.register(selector,
SelectionKey.OP_READ | SelectionKey.OP_WRITE);
key.attach(CallbackHandlerSelectionKeyAttachment.create(key, callbackHandler));
onConnectInterest(key, ctx);
}
/**
* Shuntdown this instance by closing its Selector and associated channels.
*/
@Override
public void shutdown(){
// If shutdown was called for this SelectorHandler
if (isShutDown.getAndSet(true)) return;
stateHolder.setState(State.STOPPED);
try {
if ( datagramSocket != null )
datagramSocket.close();
} catch (Throwable ex){
Controller.logger().log(Level.SEVERE,
"closeSocketException",ex);
}
try{
if ( datagramChannel != null)
datagramChannel.close();
} catch (Throwable ex){
Controller.logger().log(Level.SEVERE,
"closeSocketException",ex);
}
try{
if ( selector != null)
selector.close();
} catch (Throwable ex){
Controller.logger().log(Level.SEVERE,
"closeSocketException",ex);
}
if (asyncQueueReader != null) {
asyncQueueReader.close();
asyncQueueReader = null;
}
if (asyncQueueWriter != null) {
asyncQueueWriter.close();
asyncQueueWriter = null;
}
}
/**
* Handle OP_ACCEPT. Not used for UPD.
*/
@Override
public boolean onAcceptInterest(SelectionKey key, Context ctx) throws IOException{
return false;
}
/**
* {@inheritDoc}
*/
@Override
public Class getPreferredSelectionKeyHandler() {
return BaseSelectionKeyHandler.class;
}
/**
* A token describing the protocol supported by an implementation of this
* interface
*/
@Override
public Controller.Protocol protocol(){
return Controller.Protocol.UDP;
}
@Override
public int getPortLowLevel() {
if (datagramSocket != null) {
return datagramSocket.getLocalPort();
}
return -1;
}
@Override
public int getSsBackLog() {
throw new IllegalStateException(NOT_SUPPORTED);
}
@Override
public void setSsBackLog(int ssBackLog) {
throw new IllegalStateException(NOT_SUPPORTED);
}
@Override
public boolean isTcpNoDelay() {
throw new IllegalStateException(NOT_SUPPORTED);
}
@Override
public void setTcpNoDelay(boolean tcpNoDelay) {
throw new IllegalStateException(NOT_SUPPORTED);
}
@Override
public int getLinger() {
throw new IllegalStateException(NOT_SUPPORTED);
}
@Override
public void setLinger(int linger) {
throw new IllegalStateException(NOT_SUPPORTED);
}
@Override
public int getSocketTimeout() {
throw new IllegalStateException(NOT_SUPPORTED);
}
@Override
public void setSocketTimeout(int socketTimeout) {
throw new IllegalStateException(NOT_SUPPORTED);
}
@Override
public void closeChannel(SelectableChannel channel) {
try{
channel.close();
} catch (IOException ex){
; // LOG ME
}
if (asyncQueueReader != null) {
asyncQueueReader.onClose(channel);
}
if (asyncQueueWriter != null) {
asyncQueueWriter.onClose(channel);
}
}
//--------------- ConnectorInstanceHandler -----------------------------
@Override
protected Callable getConnectorInstanceHandlerDelegate() {
return new Callable() {
public ConnectorHandler call() throws Exception {
return new UDPConnectorHandler();
}
};
}
}