From 0eb87e5140207d452f9103ffd25ea0a397bd3d97 Mon Sep 17 00:00:00 2001
From: Eugene Zhuravlev <jeka@intellij.com>
Date: Wed, 18 Jan 2017 12:15:43 +0100
Subject: [PATCH] make sure scheduled or running automake builds are canceled
 before a process starts

---
 .../compiler/server/BuildManager.java         | 22 +++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/java/compiler/impl/src/com/intellij/compiler/server/BuildManager.java b/java/compiler/impl/src/com/intellij/compiler/server/BuildManager.java
index a5b5b7a9dc1e..bdd840acdb3a 100644
--- a/java/compiler/impl/src/com/intellij/compiler/server/BuildManager.java
+++ b/java/compiler/impl/src/com/intellij/compiler/server/BuildManager.java
@@ -1520,10 +1520,24 @@ public class BuildManager implements Disposable {
       });
       conn.subscribe(ExecutionManager.EXECUTION_TOPIC, new ExecutionListener() {
         @Override
-        public void processTerminated(@NotNull String executorId,
-                                      @NotNull ExecutionEnvironment env,
-                                      @NotNull ProcessHandler handler,
-                                      int exitCode) {
+        public void processStarting(@NotNull String executorId, @NotNull ExecutionEnvironment env) {
+          cancelAutoMakeTasks(env.getProject()); // make sure to cancel all automakes waiting in the build queue
+        }
+
+        @Override
+        public void processStarted(@NotNull String executorId, @NotNull ExecutionEnvironment env, @NotNull ProcessHandler handler) {
+          // make sure to cancel all automakes added to the build queue after processStaring and before this event
+          cancelAutoMakeTasks(env.getProject());
+        }
+
+        @Override
+        public void processNotStarted(@NotNull String executorId, @NotNull ExecutionEnvironment env) {
+          // augmenting reaction to processTerminated(): in case any automakes were canceled before process start
+          scheduleAutoMake();
+        }
+
+        @Override
+        public void processTerminated(@NotNull String executorId, @NotNull ExecutionEnvironment env, @NotNull ProcessHandler handler, int exitCode) {
           scheduleAutoMake();
         }
       });