1 /* 2 * Copyright (C) 2015 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.messaging.util; 18 19 import android.os.SystemClock; 20 21 /** 22 * A utility timer that logs the execution time of operations 23 */ 24 public class LoggingTimer { 25 private static final int NO_WARN_LIMIT = -1; 26 27 private final String mTag; 28 private final String mName; 29 private final long mWarnLimitMillis; 30 private long mStartMillis; 31 LoggingTimer(final String tag, final String name)32 public LoggingTimer(final String tag, final String name) { 33 this(tag, name, NO_WARN_LIMIT); 34 } 35 LoggingTimer(final String tag, final String name, final long warnLimitMillis)36 public LoggingTimer(final String tag, final String name, final long warnLimitMillis) { 37 mTag = tag; 38 mName = name; 39 mWarnLimitMillis = warnLimitMillis; 40 } 41 42 /** 43 * This method should be called at the start of the operation to be timed. 44 */ start()45 public void start() { 46 mStartMillis = SystemClock.elapsedRealtime(); 47 48 if (LogUtil.isLoggable(mTag, LogUtil.VERBOSE)) { 49 LogUtil.v(mTag, "Timer start for " + mName); 50 } 51 } 52 53 /** 54 * This method should be called at the end of the operation to be timed. It logs the time since 55 * the last call to {@link #start} 56 */ stopAndLog()57 public void stopAndLog() { 58 final long elapsedMs = SystemClock.elapsedRealtime() - mStartMillis; 59 60 final String logMessage = String.format("Used %dms for %s", elapsedMs, mName); 61 62 LogUtil.save(LogUtil.DEBUG, mTag, logMessage); 63 64 if (mWarnLimitMillis != NO_WARN_LIMIT && elapsedMs > mWarnLimitMillis) { 65 LogUtil.w(mTag, logMessage); 66 } else if (LogUtil.isLoggable(mTag, LogUtil.VERBOSE)) { 67 LogUtil.v(mTag, logMessage); 68 } 69 } 70 } 71