IDEMPIERE-4154 ServerPush Adjustments. Further refinement of the long polling serverpush implmentation. Add back zk-websocket-serverpush.xml

org.adempiere.ui.zk/WEB-INF/src/fi/jawsy/jawwa/zk/atmosphere/AtmosphereServerPush.java

@@ -184,11 +184,27 @@ public class AtmosphereServerPush implements ServerPush {
 	        synchronized (schedules) {
 				schedules.add(new Schedule(task, event, scheduler));
 			}
+	        boolean ok = false;
 	        try {
-	        	commitResponse();
+	        	ok = commitResponse();
 			} catch (IOException e) {
 				log.error(e.getMessage(), e);
 			}
+	        if (!ok) {
+	        	try {
+					Thread.sleep(500);
+				} catch (InterruptedException e1) {}
+	        	if (schedules.size() > 0) {
+		        	try {
+			        	ok = commitResponse();
+					} catch (IOException e) {
+						log.error(e.getMessage(), e);
+					}
+		        	if (!ok) {
+			        	log.warn("Failed to resume long polling resource");
+			        }
+	        	}	        	
+	        }	        
     	} else {
     		//in event listener thread, can schedule immediately
     		scheduler.schedule(task, event);
@@ -204,11 +220,16 @@ public class AtmosphereServerPush implements ServerPush {
             return;
         }
 
-        log.debug("Starting server push for " + desktop);
-        Clients.response("jawwa.atmosphere.serverpush", new AuScript(null, "jawwa.atmosphere.startServerPush('" + desktop.getId() + "', " + timeout
-                + ");"));
+        if (log.isDebugEnabled())
+        	log.debug("Starting server push for " + desktop);
+        startClientPush(desktop);
     }
 
+	private void startClientPush(Desktop desktop) {
+		Clients.response("jawwa.atmosphere.serverpush", new AuScript(null, "jawwa.atmosphere.startServerPush('" + desktop.getId() + "', " + timeout
+                + ");"));
+	}
+
     @Override
     public void stop() {
         Desktop desktop = this.desktop.getAndSet(null);
@@ -217,7 +238,8 @@ public class AtmosphereServerPush implements ServerPush {
             return;
         }
 
-        log.debug("Stopping server push for " + desktop);
+        if (log.isDebugEnabled())
+        	log.debug("Stopping server push for " + desktop);
         Clients.response("jawwa.atmosphere.serverpush", new AuScript(null, "jawwa.atmosphere.stopServerPush('" + desktop.getId() + "');"));
         try {
 			commitResponse();
@@ -263,6 +285,11 @@ public class AtmosphereServerPush implements ServerPush {
 
 	@Override
 	public void resume() {
+		if (desktop == null || desktop.get() == null) {
+			throw new IllegalStateException(
+					"ServerPush cannot be resumed without desktop, or has been stopped!call #start(desktop)} instead");
+		}
+		startClientPush(desktop.get());
 	}
 	
 	private class Schedule<T extends Event> {

org.adempiere.ui.zk/WEB-INF/src/web/js/jawwa/atmosphere/serverpush.js

@@ -64,6 +64,7 @@
 
       var jqxhr = $.ajax(this.ajaxOptions);
       this._req = jqxhr;
+      zAu.cmd0.echo(this.desktop);
     },
     start: function() {
       this.desktop._serverpush = this;

org.adempiere.ui.zk/WEB-INF/zk-websocket-serverpush.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE zk>
+
+	<!--
+		zk.xml Copyright (C) 2006 Potix Corporation. All Rights Reserved.
+	-->
+
+<zk>
+	<device-config>
+ 		<device-type>ajax</device-type>
+      		<server-push-class>org.idempiere.ui.zk.websocket.WebSocketServerPush</server-push-class>
+	</device-config>
+</zk>