| // Copyright 2022 The Bazel Authors. 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.platform; |
| |
| import com.google.common.flogger.GoogleLogger; |
| import com.google.devtools.build.lib.events.Reporter; |
| import com.google.devtools.build.lib.jni.JniLoader; |
| import com.google.devtools.build.lib.runtime.BlazeModule; |
| import com.google.devtools.build.lib.runtime.CommandEnvironment; |
| import javax.annotation.Nullable; |
| import javax.annotation.concurrent.GuardedBy; |
| |
| /** Detects cpu speed events. */ |
| public final class SystemCPUSpeedModule extends BlazeModule { |
| private static final GoogleLogger logger = GoogleLogger.forEnclosingClass(); |
| |
| static { |
| JniLoader.loadJni(); |
| } |
| |
| @GuardedBy("this") |
| @Nullable |
| private Reporter reporter; |
| |
| private native void registerJNI(); |
| |
| private static native int cpuSpeed(); |
| |
| public SystemCPUSpeedModule() { |
| if (JniLoader.isJniAvailable()) { |
| registerJNI(); |
| } |
| } |
| |
| @Override |
| public synchronized void beforeCommand(CommandEnvironment env) { |
| this.reporter = env.getReporter(); |
| int startingSpeed = cpuSpeed(); |
| if (startingSpeed < 100) { |
| cpuSpeedCallback(startingSpeed); |
| } |
| } |
| |
| @Override |
| public synchronized void afterCommand() { |
| this.reporter = null; |
| } |
| |
| private synchronized void cpuSpeedCallback(int speed) { |
| if (speed == -1) { |
| // Speeds of -1 imply an error occurred in our speed gathering code. |
| // It is expected that lower level code has logged the error, so we are just going to ignore. |
| return; |
| } |
| SystemCPUSpeedEvent event = new SystemCPUSpeedEvent(speed); |
| if (reporter != null) { |
| reporter.post(event); |
| } |
| logger.atInfo().log("%s", event.logString()); |
| } |
| } |