1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 package org.apache.giraph.metrics; 20 21 import org.apache.giraph.time.SystemTime; 22 import org.apache.giraph.time.Time; 23 import org.apache.giraph.time.Times; 24 25 import java.util.concurrent.TimeUnit; 26 27 /** 28 * Context to use with GiraphTimer for timing an event. 29 */ 30 public class GiraphTimerContext { 31 /** Object to use for time measurement */ 32 private static Time TIME = SystemTime.get(); 33 34 /** GiraphTimer to callback to with result of timing */ 35 private GiraphTimer giraphTimer; 36 /** Beginning time to compare against */ 37 private long startTime; 38 39 /** 40 * Create with GiraphTimer to callback to. 41 * 42 * @param giraphTimer GiraphTimer to use. 43 */ 44 public GiraphTimerContext(GiraphTimer giraphTimer) { 45 this.giraphTimer = giraphTimer; 46 this.startTime = TIME.getNanoseconds(); 47 } 48 49 /** 50 * End timing. Set time elapsed in GiraphTimer. 51 */ 52 public void stop() { 53 giraphTimer.set(Times.getNanosecondsSince(TIME, startTime), 54 TimeUnit.NANOSECONDS); 55 } 56 }