com.sun.grizzly.comet.DefaultNotificationHandler Maven / Gradle / Ivy
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package com.sun.grizzly.comet;
import com.sun.grizzly.Controller;
import com.sun.grizzly.comet.concurrent.DefaultConcurrentCometHandler;
import java.io.IOException;
import java.util.Iterator;
import java.util.concurrent.ExecutorService;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Default Notificationhandler that uses a thread pool dedicated to the CometEngine
* to execute the notification process.
*
* @author Jeanfrancois Arcand
* @author Gustav Trede
*/
public class DefaultNotificationHandler implements NotificationHandler{
private final static Logger logger = Controller.logger();
private static final IllegalStateException ISEempty = new IllegalStateException();
/**
* The {@link ExecutorService} used to execute threaded notification.
*/
protected ExecutorService threadPool;
/**
* true if the caller of CometContext.notify should block when
* notifying other CometHandler.
* false is default
*/
protected boolean blockingNotification;
/**
* only used if blockingnotification == false and threadpool != null
*/
private boolean spreadNotifyToManyToThreads = true;
public DefaultNotificationHandler() {
}
/**
* Set the {@link ExecutorService} used for notifying the CometHandler.
*/
protected void setThreadPool(ExecutorService threadPool){
this.threadPool = threadPool;
}
/**
* Return true if the invoker of notify() should block when
* notifying Comet Handlers.
*/
public boolean isBlockingNotification() {
return blockingNotification;
}
/**
* Set to true if the invoker of notify() should block when
* notifying Comet Handlers.
*/
public void setBlockingNotification(boolean blockingNotification) {
this.blockingNotification = blockingNotification;
}
/**
* Notify all {@link CometHandler}.
* @param cometEvent the CometEvent used to notify CometHandler
* @param iteratorHandlers An iterator over a list of CometHandler
*/
public void notify(final CometEvent cometEvent,final Iterator iteratorHandlers)
throws IOException {
if (!spreadNotifyToManyToThreads && !blockingNotification && threadPool != null ){
threadPool.execute(new Runnable() {
public void run() {
while(iteratorHandlers.hasNext()){
notify0(cometEvent, iteratorHandlers.next());
}
}});
}else {
while(iteratorHandlers.hasNext()){
notify(cometEvent,iteratorHandlers.next());
}
}
}
/**
* Notify the {@link CometHandler}.
* @param cometEvent cometEvent the CometEvent used to notify CometHandler
* @param cometHandler
*/
public void notify(final CometEvent cometEvent,final CometHandler cometHandler)
throws IOException{
if (blockingNotification || threadPool == null ){
notify0(cometEvent,cometHandler);
} else {
threadPool.execute(new Runnable() {
public void run() {
notify0(cometEvent, cometHandler);
}
});
}
}
/**
* Notify a {@link CometHandler}.
*
* CometEvent.INTERRUPT -> CometHandler.onInterrupt
* CometEvent.NOTIFY -> CometHandler.onEvent
* CometEvent.INITIALIZE -> CometHandler.onInitialize
* CometEvent.TERMINATE -> CometHandler.onTerminate
* CometEvent.READ -> CometHandler.onEvent
* CometEvent.WRITE -> CometHandler.onEvent
*
* @param attachment An object shared amongst {@link CometHandler}.
* @param cometHandler The CometHandler to invoke.
*/
protected void notify0(CometEvent cometEvent,CometHandler cometHandler) {
try{
switch (cometEvent.getType()) {
case CometEvent.INTERRUPT:
if (cometHandler instanceof DefaultConcurrentCometHandler){
((DefaultConcurrentCometHandler)cometHandler).shutdownQueue();
//todo how do we synchronize ?, the defaultConcurrentcomethandler can do that, but we dont know if other implementations do
cometHandler.onInterrupt(cometEvent);
}else
synchronized(cometHandler){
cometHandler.onInterrupt(cometEvent);
}
break;
case CometEvent.NOTIFY:
case CometEvent.READ:
case CometEvent.WRITE:
if (cometHandler instanceof DefaultConcurrentCometHandler)
((DefaultConcurrentCometHandler)cometHandler).EnQueueEvent(cometEvent);
else
if (cometEvent.getCometContext().isActive(cometHandler))
synchronized(cometHandler){
cometHandler.onEvent(cometEvent);
}
break;
case CometEvent.INITIALIZE:
cometHandler.onInitialize(cometEvent);
break;
case CometEvent.TERMINATE:
if (cometHandler instanceof DefaultConcurrentCometHandler){
((DefaultConcurrentCometHandler)cometHandler).shutdownQueue();
cometHandler.onTerminate(cometEvent); //todo how do we synchronize ?, the defaultConcurrentcomethandler can do that, but we dont know if other implementations do
}else
synchronized(cometHandler){
cometHandler.onTerminate(cometEvent);
}
break;
default:
throw ISEempty;
}
} catch (Throwable ex) {
try {
cometEvent.getCometContext().resumeCometHandler(cometHandler, true);
} catch (Throwable t) {
logger.log(Level.FINE, "Resume phase failed: ", t);
}
//todo cant log this at WARNING level.. its normal to have alot of failed notifications. imagine several K users in the real world..
logger.log(Level.FINE, "Notification failed: ", ex);
}
}
}
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