From 0420d5cbb59363c5cdda10c4e042d6bb2f990139 Mon Sep 17 00:00:00 2001
From: peter <peter@jetbrains.com>
Date: Wed, 22 Nov 2017 22:51:53 +0100
Subject: [PATCH] speedup MessageBus.hasUndeliveredEvents (inspired by
 IDEA-182529)

---
 .../util/messages/impl/MessageBusConnectionImpl.java         | 5 ++++-
 .../src/com/intellij/util/messages/impl/MessageBusImpl.java  | 3 ++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/platform/util/src/com/intellij/util/messages/impl/MessageBusConnectionImpl.java b/platform/util/src/com/intellij/util/messages/impl/MessageBusConnectionImpl.java
index 4f2fe46b7dc9..bac709b9a1e1 100644
--- a/platform/util/src/com/intellij/util/messages/impl/MessageBusConnectionImpl.java
+++ b/platform/util/src/com/intellij/util/messages/impl/MessageBusConnectionImpl.java
@@ -139,7 +139,10 @@ public class MessageBusConnectionImpl implements MessageBusConnection {
   }
 
   boolean containsMessage(@NotNull Topic topic) {
-    for (Message message : myPendingMessages.get()) {
+    Queue<Message> pendingMessages = myPendingMessages.get();
+    if (pendingMessages.isEmpty()) return false;
+    
+    for (Message message : pendingMessages) {
       if (message.getTopic() == topic) {
         return true;
       }
diff --git a/platform/util/src/com/intellij/util/messages/impl/MessageBusImpl.java b/platform/util/src/com/intellij/util/messages/impl/MessageBusImpl.java
index 87d12d493727..11e760a4c70f 100644
--- a/platform/util/src/com/intellij/util/messages/impl/MessageBusImpl.java
+++ b/platform/util/src/com/intellij/util/messages/impl/MessageBusImpl.java
@@ -301,7 +301,8 @@ public class MessageBusImpl implements MessageBus {
   }
 
   private boolean isDispatchingAnything() {
-    return getRootBus().myWaitingBuses.get() != null;
+    SortedMap<MessageBusImpl, Integer> waitingBuses = getRootBus().myWaitingBuses.get();
+    return waitingBuses != null && !waitingBuses.isEmpty();
   }
 
   private void checkNotDisposed() {