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      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 
     39     public SimpleTimer() {
     40         this(false);
     41     }
     42 
     43     public SimpleTimer(boolean enabled) {
     44         mEnabled = enabled;
     45     }
     46 
     47     public final boolean isEnabled() {
     48         return ENABLE_SIMPLE_TIMER && LogUtils.isLoggable(getTag(), LogUtils.DEBUG)
     49                 && mEnabled;
     50     }
     51 
     52     public SimpleTimer withSessionName(String sessionName) {
     53         mSessionName = sessionName;
     54         return this;
     55     }
     56 
     57     public void start() {
     58         mStartTime = mLastMarkTime = SystemClock.uptimeMillis();
     59         LogUtils.d(getTag(), "timer START");
     60     }
     61 
     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 
     71     private String getTag() {
     72         return TextUtils.isEmpty(mSessionName) ? DEFAULT_LOG_TAG : mSessionName;
     73     }
     74 
     75 }
     76