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      1 /*
      2  * Copyright (C) 2012 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 com.android.contacts.common.util;
     18 
     19 import com.android.dialer.common.LogUtil;
     20 import java.util.ArrayList;
     21 
     22 /** A {@link StopWatch} records start, laps and stop, and print them to logcat. */
     23 public class StopWatch {
     24 
     25   private final String mLabel;
     26 
     27   private final ArrayList<Long> mTimes = new ArrayList<>();
     28   private final ArrayList<String> mLapLabels = new ArrayList<>();
     29 
     30   private StopWatch(String label) {
     31     mLabel = label;
     32     lap("");
     33   }
     34 
     35   /** Create a new instance and start it. */
     36   public static StopWatch start(String label) {
     37     return new StopWatch(label);
     38   }
     39 
     40   /** Record a lap. */
     41   public void lap(String lapLabel) {
     42     mTimes.add(System.currentTimeMillis());
     43     mLapLabels.add(lapLabel);
     44   }
     45 
     46   /** Stop it and log the result, if the total time >= {@code timeThresholdToLog}. */
     47   public void stopAndLog(String TAG, int timeThresholdToLog) {
     48 
     49     lap("");
     50 
     51     final long start = mTimes.get(0);
     52     final long stop = mTimes.get(mTimes.size() - 1);
     53 
     54     final long total = stop - start;
     55     if (total < timeThresholdToLog) {
     56       return;
     57     }
     58 
     59     final StringBuilder sb = new StringBuilder();
     60     sb.append(mLabel);
     61     sb.append(",");
     62     sb.append(total);
     63     sb.append(": ");
     64 
     65     long last = start;
     66     for (int i = 1; i < mTimes.size(); i++) {
     67       final long current = mTimes.get(i);
     68       sb.append(mLapLabels.get(i));
     69       sb.append(",");
     70       sb.append((current - last));
     71       sb.append(" ");
     72       last = current;
     73     }
     74     LogUtil.v(TAG, sb.toString());
     75   }
     76 }
     77