1 /* 2 * Copyright (C) 2015 The Dagger Authors. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package dagger.producers.monitoring; 18 19 import static java.util.concurrent.TimeUnit.NANOSECONDS; 20 21 import com.google.common.base.Stopwatch; 22 import com.google.common.base.Ticker; 23 24 /** 25 * A monitor that measures the timing of the execution of a producer method, and logs those timings 26 * with the given recorder. 27 */ 28 @SuppressWarnings("GoodTime") // should use java.time.Duration 29 final class TimingProducerMonitor extends ProducerMonitor { 30 private final ProducerTimingRecorder recorder; 31 private final Stopwatch stopwatch; 32 private final Stopwatch componentStopwatch; 33 private long startNanos = -1; 34 TimingProducerMonitor( ProducerTimingRecorder recorder, Ticker ticker, Stopwatch componentStopwatch)35 TimingProducerMonitor( 36 ProducerTimingRecorder recorder, Ticker ticker, Stopwatch componentStopwatch) { 37 this.recorder = recorder; 38 this.stopwatch = Stopwatch.createUnstarted(ticker); 39 this.componentStopwatch = componentStopwatch; 40 } 41 42 @Override methodStarting()43 public void methodStarting() { 44 startNanos = componentStopwatch.elapsed(NANOSECONDS); 45 stopwatch.start(); 46 } 47 48 @Override methodFinished()49 public void methodFinished() { 50 // TODO(beder): Is a system ticker the appropriate way to track CPU time? Should we use 51 // ThreadCpuTicker instead? 52 long durationNanos = stopwatch.elapsed(NANOSECONDS); 53 recorder.recordMethod(startNanos, durationNanos); 54 } 55 56 @Override succeeded(Object o)57 public void succeeded(Object o) { 58 long latencyNanos = stopwatch.elapsed(NANOSECONDS); 59 recorder.recordSuccess(latencyNanos); 60 } 61 62 @Override failed(Throwable t)63 public void failed(Throwable t) { 64 if (stopwatch.isRunning()) { 65 long latencyNanos = stopwatch.elapsed(NANOSECONDS); 66 recorder.recordFailure(t, latencyNanos); 67 } else { 68 recorder.recordSkip(t); 69 } 70 } 71 } 72