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.Pipeline;
import com.sun.grizzly.PipelineFullException;
import com.sun.grizzly.http.TaskBase;
import java.io.IOException;
import java.util.Iterator;
import java.util.ArrayList;
import java.util.logging.Level;
/**
* Default Notificationhandler that uses the same a Grizzly Pipeline
* to execute the notification process.
*
* @author Jeanfrancois Arcand
*/
public class DefaultNotificationHandler implements NotificationHandler{
/**
* The {@link Pipeline} used to execute threaded notification.
*/
protected Pipeline pipeline;
/**
* true if the caller of CometContext.notify should block when
* notifying other CometHandler.
*/
protected boolean blockingNotification = false;
/**
* Set the {@link Pipeline} used for notifying the CometHandler.
*/
protected void setPipeline(Pipeline pipeline){
this.pipeline = pipeline;
}
/**
* 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
*/
@SuppressWarnings("unchecked")
public void notify(final CometEvent cometEvent,final Iterator
iteratorHandlers) throws IOException{
if (blockingNotification || pipeline == null){
notify0(cometEvent,iteratorHandlers);
} else {
try{
pipeline.execute(new TaskBase(){
public void doTask() throws IOException{
notify0(cometEvent,iteratorHandlers);
}
});
} catch (PipelineFullException ex){
throw new IOException(ex.getMessage());
}
}
}
protected void notify0(CometEvent cometEvent,Iterator iteratorHandlers)
throws IOException{
ArrayList exceptions = null;
while(iteratorHandlers.hasNext()){
try{
notify0(cometEvent,iteratorHandlers.next());
} catch (Throwable ex){
if (exceptions == null){
exceptions = new ArrayList();
}
exceptions.add(ex);
Controller.logger().log(Level.SEVERE,"Notification failed: ", ex);
}
}
if (exceptions != null){
StringBuffer errorMsg = new StringBuffer();
for(Throwable t: exceptions){
if (t.getMessage() != null) {
errorMsg.append(t.getMessage());
}
}
throw new IOException(errorMsg.toString());
}
}
/**
* Notify a single {@link CometHandler}.
* @param cometEvent the CometEvent used to notify CometHandler
* @param cometHandler a CometHandler
*/
@SuppressWarnings("unchecked")
public void notify(final CometEvent cometEvent,final CometHandler cometHandler)
throws IOException{
if (blockingNotification || pipeline == null){
notify0(cometEvent,cometHandler);
} else {
final ArrayList exceptions
= new ArrayList();
try{
pipeline.execute(new TaskBase(){
public void doTask() throws IOException{
try{
notify0(cometEvent,cometHandler);
} catch (Throwable ex){
exceptions.add(ex);
Controller.logger().log(Level.SEVERE,"Notification failed: ", ex);
}
if (exceptions.size() > 0){
StringBuffer errorMsg = new StringBuffer();
for(Throwable t: exceptions){
if (t.getMessage() != null){
errorMsg.append(t.getMessage());
}
}
throw new IOException(errorMsg.toString());
}
}
});
} catch (PipelineFullException ex){
throw new IOException(ex.getMessage());
}
}
}
/**
* 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)
throws IOException{
switch (cometEvent.getType()) {
case CometEvent.INTERRUPT:
cometHandler.onInterrupt(cometEvent);
break;
case CometEvent.NOTIFY:
cometHandler.onEvent(cometEvent);
break;
case CometEvent.READ:
cometHandler.onEvent(cometEvent);
break;
case CometEvent.WRITE:
cometHandler.onEvent(cometEvent);
break;
case CometEvent.INITIALIZE:
cometHandler.onInitialize(cometEvent);
break;
case CometEvent.TERMINATE:
cometHandler.onTerminate(cometEvent);
break;
default:
throw new IllegalStateException();
}
}
}
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