| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package com.alibaba.jstorm.common.metric.old; |
| |
| import java.io.Closeable; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * Use com.codahale.metrics's interface |
| * |
| * @author zhongyan.feng |
| * |
| */ |
| public class Timer extends Histogram { |
| private static final long serialVersionUID = 5915881891513771108L; |
| |
| /** |
| * A timing context. |
| * |
| * @see Timer#time() |
| */ |
| public static class Context implements Closeable { |
| private final Timer timer; |
| private final long startTime; |
| |
| private Context(Timer timer) { |
| this.timer = timer; |
| this.startTime = System.currentTimeMillis(); |
| } |
| |
| /** |
| * Stops recording the elapsed time, updates the timer and returns the elapsed time in nanoseconds. |
| */ |
| public long stop() { |
| final long elapsed = System.currentTimeMillis() - startTime; |
| timer.update(elapsed, TimeUnit.MILLISECONDS); |
| return elapsed; |
| } |
| |
| @Override |
| public void close() { |
| stop(); |
| } |
| } |
| |
| public Timer() { |
| init(); |
| } |
| |
| /** |
| * Adds a recorded duration. |
| * |
| * @param duration the length of the duration |
| * @param unit the scale unit of {@code duration} |
| */ |
| public void update(long duration, TimeUnit unit) { |
| update(unit.toMillis(duration)); |
| } |
| |
| /** |
| * Times and records the duration of event. |
| * |
| * @param event a {@link Callable} whose {@link Callable#call()} method implements a process whose duration should be timed |
| * @param <T> the type of the value returned by {@code event} |
| * @return the value returned by {@code event} |
| * @throws Exception if {@code event} throws an {@link Exception} |
| */ |
| public <T> T time(Callable<T> event) throws Exception { |
| final long startTime = System.currentTimeMillis(); |
| try { |
| return event.call(); |
| } finally { |
| update(System.currentTimeMillis() - startTime); |
| } |
| } |
| |
| /** |
| * Returns a new {@link Context}. |
| * |
| * @return a new {@link Context} |
| * @see Context |
| */ |
| public Context time() { |
| return new Context(this); |
| } |
| |
| public long getCount() { |
| return allWindow.getSnapshot().getTimes(); |
| } |
| } |