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package com.sun.enterprise.web.connector.grizzly.comet;
import com.sun.enterprise.web.connector.grizzly.Pipeline;
import com.sun.enterprise.web.connector.grizzly.TaskBase;
import java.io.IOException;
import java.nio.channels.SelectionKey;
import java.util.Iterator;
import java.util.ArrayList;
/**
* Default Notificationhandler that uses the same a Grizzly Pipeline
* to execute the notification process.
*
* @author Jeanfrancois Arcand
*/
public class DefaultNotificationHandler implements NotificationHandler{
/**
* The <code>Pipeline</code> used to execute threaded notification.
*/
protected Pipeline pipeline;
/**
* <tt>true</tt> if the caller of CometContext.notify should block when
* notifying other CometHandler.
*/
protected boolean blockingNotification = false;
/**
* Set the <code>Pipeline</code> used for notifying the CometHandler.
*/
protected void setPipeline(Pipeline pipeline){
this.pipeline = pipeline;
}
/**
* Return <tt>true</tt> if the invoker of notify() should block when
* notifying Comet Handlers.
*/
public boolean isBlockingNotification() {
return blockingNotification;
}
/**
* Set to <tt>true</tt> if the invoker of notify() should block when
* notifying Comet Handlers.
*/
public void setBlockingNotification(boolean blockingNotification) {
this.blockingNotification = blockingNotification;
}
/**
* Notify all <code>CometHandler</code>.
* @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<CometHandler>
iteratorHandlers) throws IOException{
if (blockingNotification || pipeline == null){
notify0(cometEvent,iteratorHandlers);
} else {
pipeline.addTask(new TaskBase(){
public void doTask() throws IOException{
notify0(cometEvent,iteratorHandlers);
}
});
}
}
protected void notify0(CometEvent cometEvent,Iterator<CometHandler> iteratorHandlers)
throws IOException{
ArrayList<Throwable> exceptions = null;
while(iteratorHandlers.hasNext()){
try{
notify0(cometEvent,iteratorHandlers.next());
} catch (Throwable ex){
if (exceptions == null){
exceptions = new ArrayList<Throwable>();
}
exceptions.add(ex);
}
}
if (exceptions != null){
StringBuffer errorMsg = new StringBuffer();
for(Throwable t: exceptions){
errorMsg.append(t.getMessage());
}
throw new IOException(errorMsg.toString());
}
}
/**
* Notify a single <code>CometHandler</code>.
* @param cometEvent the CometEvent used to notify CometHandler
* @param cometHandler a CometHandler
*/
public void notify(final CometEvent cometEvent,final CometHandler cometHandler)
throws IOException{
if (blockingNotification || pipeline == null){
notify0(cometEvent,cometHandler);
} else {
final ArrayList<Throwable> exceptions
= new ArrayList<Throwable>();
pipeline.addTask(new TaskBase(){
public void doTask() throws IOException{
try{
notify0(cometEvent,cometHandler);
} catch (Throwable ex){
exceptions.add(ex);
}
if (exceptions.size() > 0){
StringBuffer errorMsg = new StringBuffer();
for(Throwable t: exceptions){
errorMsg.append(t.getMessage());
}
throw new IOException(errorMsg.toString());
}
}
});
}
}
/**
* Notify a <code>CometHandler</code>.
*
* CometEvent.INTERRUPT -> <code>CometHandler.onInterrupt</code>
* CometEvent.NOTIFY -> <code>CometHandler.onEvent</code>
* CometEvent.INITIALIZE -> <code>CometHandler.onInitialize</code>
* CometEvent.TERMINATE -> <code>CometHandler.onTerminate</code>
* CometEvent.READ -> <code>CometHandler.onEvent</code>
* CometEvent.WRITE -> <code>CometHandler.onEvent</code>
*
* @param attachment An object shared amongst <code>CometHandler</code>.
* @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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