Update from Google.
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MOE_MIGRATED_REVID=85702957
diff --git a/src/main/java/com/google/devtools/build/lib/runtime/BuildSummaryStatsModule.java b/src/main/java/com/google/devtools/build/lib/runtime/BuildSummaryStatsModule.java
new file mode 100644
index 0000000..8b072c7
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/runtime/BuildSummaryStatsModule.java
@@ -0,0 +1,88 @@
+// Copyright 2014 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package com.google.devtools.build.lib.runtime;
+
+import com.google.common.base.Joiner;
+import com.google.common.eventbus.EventBus;
+import com.google.common.eventbus.Subscribe;
+import com.google.devtools.build.lib.buildtool.buildevent.BuildCompleteEvent;
+import com.google.devtools.build.lib.buildtool.buildevent.ExecutionStartingEvent;
+import com.google.devtools.build.lib.events.Event;
+import com.google.devtools.build.lib.events.Reporter;
+import com.google.devtools.build.lib.profiler.Profiler;
+import com.google.devtools.build.lib.profiler.ProfilerTask;
+import com.google.devtools.build.lib.util.BlazeClock;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+import java.util.logging.Logger;
+
+/**
+ * Blaze module for the build summary message that reports various stats to the user.
+ */
+public class BuildSummaryStatsModule extends BlazeModule {
+
+ private static final Logger LOG = Logger.getLogger(BuildSummaryStatsModule.class.getName());
+
+ private SimpleCriticalPathComputer criticalPathComputer;
+ private EventBus eventBus;
+ private Reporter reporter;
+
+ @Override
+ public void beforeCommand(BlazeRuntime runtime, Command command) {
+ this.reporter = runtime.getReporter();
+ this.eventBus = runtime.getEventBus();
+ eventBus.register(this);
+ }
+
+ @Subscribe
+ public void executionPhaseStarting(ExecutionStartingEvent event) {
+ criticalPathComputer = new SimpleCriticalPathComputer(BlazeClock.instance());
+ eventBus.register(criticalPathComputer);
+ }
+
+ @Subscribe
+ public void buildComplete(BuildCompleteEvent event) {
+ try {
+ // We might want to make this conditional on a flag; it can sometimes be a bit of a nuisance.
+ List<String> items = new ArrayList<>();
+ items.add(String.format("Elapsed time: %.3fs", event.getResult().getElapsedSeconds()));
+
+ if (criticalPathComputer != null) {
+ Profiler.instance().startTask(ProfilerTask.CRITICAL_PATH, "Critical path");
+ AggregatedCriticalPath<SimpleCriticalPathComponent> criticalPath =
+ criticalPathComputer.aggregate();
+ items.add(criticalPath.toStringSummary());
+ LOG.info(criticalPath.toString());
+ LOG.info("Slowest actions:\n " + Joiner.on("\n ")
+ .join(criticalPathComputer.getSlowestComponents()));
+ // We reverse the critical path because the profiler expect events ordered by the time
+ // when the actions were executed while critical path computation is stored in the reverse
+ // way.
+ for (SimpleCriticalPathComponent stat : criticalPath.components().reverse()) {
+ Profiler.instance().logSimpleTaskDuration(
+ TimeUnit.MILLISECONDS.toNanos(stat.getStartTime()),
+ TimeUnit.MILLISECONDS.toNanos(stat.getActionWallTime()),
+ ProfilerTask.CRITICAL_PATH_COMPONENT, stat.getAction());
+ }
+ Profiler.instance().completeTask(ProfilerTask.CRITICAL_PATH);
+ }
+
+ reporter.handle(Event.info(Joiner.on(", ").join(items)));
+ } finally {
+ criticalPathComputer = null;
+ }
+ }
+}
