1 /* 2 * Copyright (C) 2011 The Android Open Source Project 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 android.filterfw.core; 18 19 import android.os.SystemClock; 20 import android.util.Log; 21 import java.util.HashMap; 22 23 /** 24 * @hide 25 */ 26 class StopWatch { 27 28 private int STOP_WATCH_LOGGING_PERIOD = 200; 29 private String TAG = "MFF"; 30 31 private String mName; 32 private long mStartTime; 33 private long mTotalTime; 34 private int mNumCalls; 35 36 public StopWatch(String name) { 37 mName = name; 38 mStartTime = -1; 39 mTotalTime = 0; 40 mNumCalls = 0; 41 } 42 43 public void start() { 44 if (mStartTime != -1) { 45 throw new RuntimeException( 46 "Calling start with StopWatch already running"); 47 } 48 mStartTime = SystemClock.elapsedRealtime(); 49 } 50 51 public void stop() { 52 if (mStartTime == -1) { 53 throw new RuntimeException( 54 "Calling stop with StopWatch already stopped"); 55 } 56 long stopTime = SystemClock.elapsedRealtime(); 57 mTotalTime += stopTime - mStartTime; 58 ++mNumCalls; 59 mStartTime = -1; 60 if (mNumCalls % STOP_WATCH_LOGGING_PERIOD == 0) { 61 Log.i(TAG, "AVG ms/call " + mName + ": " + 62 String.format("%.1f", mTotalTime * 1.0f / mNumCalls)); 63 mTotalTime = 0; 64 mNumCalls = 0; 65 } 66 } 67 68 } 69 70 public class StopWatchMap { 71 72 public boolean LOG_MFF_RUNNING_TIMES = false; 73 74 private HashMap<String, StopWatch> mStopWatches = null; 75 76 public StopWatchMap() { 77 mStopWatches = new HashMap<String, StopWatch>(); 78 } 79 80 public void start(String stopWatchName) { 81 if (!LOG_MFF_RUNNING_TIMES) { 82 return; 83 } 84 if (!mStopWatches.containsKey(stopWatchName)) { 85 mStopWatches.put(stopWatchName, new StopWatch(stopWatchName)); 86 } 87 mStopWatches.get(stopWatchName).start(); 88 } 89 90 public void stop(String stopWatchName) { 91 if (!LOG_MFF_RUNNING_TIMES) { 92 return; 93 } 94 if (!mStopWatches.containsKey(stopWatchName)) { 95 throw new RuntimeException( 96 "Calling stop with unknown stopWatchName: " + stopWatchName); 97 } 98 mStopWatches.get(stopWatchName).stop(); 99 } 100 101 } 102