1 /* 2 * Copyright (C) 2013 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 package com.android.mail.perf; 17 18 import android.os.SystemClock; 19 import android.text.TextUtils; 20 21 import com.android.mail.utils.LogUtils; 22 23 /** 24 * A simple perf timer class that supports lap-time-style measurements. Once a 25 * timer is started, any number of laps can be marked, but they are all relative 26 * to the original start time. 27 */ 28 public class SimpleTimer { 29 30 private static final String DEFAULT_LOG_TAG = "SimpleTimer"; 31 32 private static final boolean ENABLE_SIMPLE_TIMER = false; 33 34 private final boolean mEnabled; 35 private long mStartTime; 36 private long mLastMarkTime; 37 private String mSessionName; 38 SimpleTimer()39 public SimpleTimer() { 40 this(false); 41 } 42 SimpleTimer(boolean enabled)43 public SimpleTimer(boolean enabled) { 44 mEnabled = enabled; 45 } 46 isEnabled()47 public final boolean isEnabled() { 48 return ENABLE_SIMPLE_TIMER && LogUtils.isLoggable(getTag(), LogUtils.DEBUG) 49 && mEnabled; 50 } 51 withSessionName(String sessionName)52 public SimpleTimer withSessionName(String sessionName) { 53 mSessionName = sessionName; 54 return this; 55 } 56 start()57 public void start() { 58 mStartTime = mLastMarkTime = SystemClock.uptimeMillis(); 59 LogUtils.d(getTag(), "timer START"); 60 } 61 mark(String msg)62 public void mark(String msg) { 63 if (isEnabled()) { 64 long now = SystemClock.uptimeMillis(); 65 LogUtils.d(getTag(), "[%s] %sms elapsed (%sms since last mark)", msg, now - mStartTime, 66 now - mLastMarkTime); 67 mLastMarkTime = now; 68 } 69 } 70 getTag()71 private String getTag() { 72 return TextUtils.isEmpty(mSessionName) ? DEFAULT_LOG_TAG : mSessionName; 73 } 74 75 } 76