Keep direct link to trigger in EventListener

It would speed up event processing a lot. As scanning all jobs and
looking for trigger needs significant amount of time.

src/main/java/com/sonyericsson/hudson/plugins/gerrit/trigger/hudsontrigger/EventListener.java

@@ -73,23 +73,27 @@ public final class EventListener implements GerritEventListener {
     private static final Logger logger = LoggerFactory.getLogger(EventListener.class);
 
     private final String job;
+    private final transient GerritTrigger trigger;
 
     /**
      * Standard constructor.
      *
      * @param job the job to handle.
+     * @param trigger the trigger
      */
-    EventListener(@Nonnull Job job) {
-        this(job.getFullName());
+    EventListener(@Nonnull Job job, GerritTrigger trigger) {
+        this(job.getFullName(), trigger);
     }
 
     /**
      * Standard constructor.
      *
      * @param fullName the job to handle full name.
+     * @param trigger the trigger
      */
-    EventListener(@Nonnull String fullName) {
+    EventListener(@Nonnull String fullName, GerritTrigger trigger) {
         this.job = fullName;
+        this.trigger = trigger;
     }
 
     /**
@@ -104,7 +108,7 @@ public String getJob() {
     @Override
     public void gerritEvent(GerritEvent event) {
         logger.trace("event: {}", event);
-        GerritTrigger t = getTrigger();
+        GerritTrigger t = trigger;
         if (t == null) {
             logger.warn("Couldn't find a configured trigger for {}", job);
             return;
@@ -126,7 +130,7 @@ public void gerritEvent(GerritEvent event) {
      */
     public void gerritEvent(ManualPatchsetCreated event) {
         logger.trace("event: {}", event);
-        GerritTrigger t = getTrigger();
+        GerritTrigger t = trigger;
         if (t == null) {
             logger.warn("Couldn't find a configured trigger for {}", job);
             return;
@@ -145,7 +149,7 @@ public void gerritEvent(ManualPatchsetCreated event) {
      */
     public void gerritEvent(CommentAdded event) {
         logger.trace("event: {}", event);
-        GerritTrigger t = getTrigger();
+        GerritTrigger t = trigger;
         if (t == null) {
             logger.warn("Couldn't find a configured trigger for {}", job);
             return;
@@ -370,11 +374,7 @@ private void notifyOnTriggered(GerritTrigger t, GerritTriggeredEvent event) {
     @CheckForNull
     @Restricted(NoExternalUse.class)
     public GerritTrigger getTrigger() {
-        Job p = findJob();
-        if (p == null) {
-            return null;
-        }
-        return GerritTrigger.getTrigger(p);
+        return trigger;
     }
 
     /**

src/main/java/com/sonyericsson/hudson/plugins/gerrit/trigger/hudsontrigger/GerritTrigger.java

@@ -516,7 +516,7 @@ void onJobRenamed(String oldFullName, String newFullName) {
         if (plugin != null) {
             GerritHandler handler = plugin.getHandler();
             if (handler != null) {
-                handler.removeListener(new EventListener(oldFullName));
+                handler.removeListener(new EventListener(oldFullName, this));
                 handler.addListener(createListener());
             }
         }
@@ -572,7 +572,7 @@ private void addThisTriggerAsListener(Job project) {
         if (plugin != null) {
             GerritHandler handler = plugin.getHandler();
             if (handler != null) {
-                handler.addListener(createListener(project));
+                handler.addListener(createListener(project, this));
             } else {
                 logger.warn("The plugin has no handler instance (BUG)! Project {} will not be triggered!",
                         project.getFullDisplayName());
@@ -586,19 +586,20 @@ private void addThisTriggerAsListener(Job project) {
     /**
      * Creates an {@link EventListener} for the provided project.
      * @param project the project
+     * @param trigger the trigger
      * @return a new listener instance
      */
-    /*package*/ static EventListener createListener(Job project) {
-        return new EventListener(project);
+    /*package*/ static EventListener createListener(Job project, GerritTrigger trigger) {
+        return new EventListener(project, trigger);
     }
 
     /**
      * Creates an {@link EventListener} for this trigger's job.
      * @return a new listener instance.
-     * @see #createListener(hudson.model.Job)
+     * @see #createListener(hudson.model.Job, GerritTrigger)
      */
     /*package*/ EventListener createListener() {
-        return createListener(job);
+        return createListener(job, this);
     }
 
     @Override