From 6c7ccde06d232365ffa628d3097e49dad7640483 Mon Sep 17 00:00:00 2001
From: Niclas Finne <nfi@sics.se>
Date: Fri, 13 Apr 2012 18:28:55 +0200
Subject: [PATCH] Added proxy for EventListener to support multiple listeners

---
 se/sics/mspsim/cli/ProfilerCommands.java |  7 ++++---
 se/sics/mspsim/core/Chip.java            | 25 ++++++++++++-----------
 se/sics/mspsim/core/EventListener.java   | 26 +++++++++++++++++++-----
 se/sics/mspsim/util/SimpleProfiler.java  |  4 ++--
 4 files changed, 40 insertions(+), 22 deletions(-)

diff --git a/se/sics/mspsim/cli/ProfilerCommands.java b/se/sics/mspsim/cli/ProfilerCommands.java
index 110b4b4..edd6f25 100644
--- a/se/sics/mspsim/cli/ProfilerCommands.java
+++ b/se/sics/mspsim/cli/ProfilerCommands.java
@@ -164,6 +164,7 @@ public class ProfilerCommands implements CommandBundle {
       
       ch.registerCommand("logevents", new BasicAsyncCommand("log events", "[chips...]") {
         Chip[] chips;
+        EventListener eventListener;
         public int executeCommand(final CommandContext context) {
             if (context.getArgumentCount() == 0) {
                 context.out.println("Available chips:");
@@ -187,19 +188,19 @@ public class ProfilerCommands implements CommandBundle {
                     return 1;
                 }
             }
-            EventListener listener = new EventListener() {
+            eventListener = new EventListener() {
                 public void event(EventSource source, String event, Object data) {
                     context.out.println("Event:" + source.getName() + ":" + event);
                 }
             };
             for (Chip chip : chips) {
-                chip.setEventListener(listener);
+                chip.addEventListener(eventListener);
             }
             return 0;
         }
         public void stopCommand(CommandContext context) {
             for (Chip chip : chips) {
-                chip.setEventListener(null);
+                chip.removeEventListener(eventListener);
             }
         }
       });
diff --git a/se/sics/mspsim/core/Chip.java b/se/sics/mspsim/core/Chip.java
index 250e78d..b22c7c9 100644
--- a/se/sics/mspsim/core/Chip.java
+++ b/se/sics/mspsim/core/Chip.java
@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2007, Swedish Institute of Computer Science.
+ * Copyright (c) 2007-2012, Swedish Institute of Computer Science.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -27,16 +27,12 @@
  *
  * This file is part of MSPSim.
  *
- * $Id$
- *
  * -----------------------------------------------------------------
  *
  * Chip
  *
  * Author  : Joakim Eriksson
  * Created : 17 jan 2008
- * Updated : $Date$
- *           $Revision$
  */
 package se.sics.mspsim.core;
 import java.io.PrintStream;
@@ -130,15 +126,20 @@ public abstract class Chip implements Loggable, EventSource {
     modeNames = names;
   }
 
-  
-  public void setEventListener(EventListener e) {
-    eventListener = e;
-    sendEvents = eventListener != null;
+  public synchronized void addEventListener(EventListener listener) {
+      eventListener = EventListener.Proxy.INSTANCE.add(eventListener, listener);
+      sendEvents = eventListener != null;
   }
-  
+
+  public synchronized void removeEventListener(EventListener listener) {
+      eventListener = EventListener.Proxy.INSTANCE.add(eventListener, listener);
+      sendEvents = eventListener != null;
+  }
+
   protected void sendEvent(String event, Object data) {
-    if (eventListener != null) {
-      eventListener.event(this, event, data);
+    EventListener listener = this.eventListener;
+    if (listener != null) {
+        listener.event(this, event, data);
     }
   }
   
diff --git a/se/sics/mspsim/core/EventListener.java b/se/sics/mspsim/core/EventListener.java
index a6950a8..848bbc2 100644
--- a/se/sics/mspsim/core/EventListener.java
+++ b/se/sics/mspsim/core/EventListener.java
@@ -1,5 +1,21 @@
-package se.sics.mspsim.core;
-
-public interface EventListener {
-  public void event(EventSource source, String event, Object data);
-}
+package se.sics.mspsim.core;
+import se.sics.mspsim.util.ProxySupport;
+
+public interface EventListener {
+
+    public void event(EventSource source, String event, Object data);
+
+    public static class Proxy extends ProxySupport<EventListener> implements EventListener {
+        public static final Proxy INSTANCE = new Proxy();
+
+        @Override
+        public void event(EventSource source, String event, Object data) {
+            EventListener[] listeners = this.listeners;
+            for(EventListener listener : listeners) {
+                listener.event(source, event, data);
+            }
+        }
+
+    }
+
+}
diff --git a/se/sics/mspsim/util/SimpleProfiler.java b/se/sics/mspsim/util/SimpleProfiler.java
index 07e513b..e800913 100644
--- a/se/sics/mspsim/util/SimpleProfiler.java
+++ b/se/sics/mspsim/util/SimpleProfiler.java
@@ -520,8 +520,8 @@ public class SimpleProfiler implements Profiler, EventListener {
     startTags.put(start, tagEntry);
     endTags.put(end, tagEntry);
     tagProfiles.put(tag, tagEntry);
-    chip.setEventListener(this);
-    chip2.setEventListener(this);
+    chip.addEventListener(this);
+    chip2.addEventListener(this);
   }
 
   public void event(EventSource source, String event, Object data) {