001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.commons.monitoring.stopwatches; 018 019 import org.apache.commons.monitoring.counters.Counter; 020 021 import java.util.concurrent.atomic.AtomicInteger; 022 023 import static org.apache.commons.monitoring.counters.Unit.Time.NANOSECOND; 024 025 public class CounterStopWatch implements StopWatch { 026 protected final Counter counter; 027 protected final long startedAt; 028 protected final AtomicInteger concurrencyCounter; 029 protected long stopedAt; 030 protected boolean stoped; 031 032 public CounterStopWatch(final Counter counter) { 033 this.counter = counter; 034 startedAt = nanotime(); 035 036 concurrencyCounter = counter.currentConcurrency(); 037 final int concurrency = concurrencyCounter.incrementAndGet(); 038 counter.updateConcurrency(concurrency); 039 } 040 041 protected long nanotime() { 042 return System.nanoTime(); 043 } 044 045 @Override 046 public long getElapsedTime() { 047 if (!stoped) { 048 return nanotime() - startedAt; 049 } 050 return stopedAt - startedAt; 051 } 052 053 @Override 054 public StopWatch stop() { 055 if (!stoped) { 056 stopedAt = nanotime(); 057 stoped = true; 058 doStop(); 059 } 060 return this; 061 } 062 063 protected void doStop() { 064 counter.add(getElapsedTime(), NANOSECOND); 065 concurrencyCounter.decrementAndGet(); 066 } 067 068 @Override 069 public String toString() { 070 final StringBuilder stb = new StringBuilder(); 071 if (counter != null) { 072 stb.append("Execution for ").append(counter.getKey().toString()).append(" "); 073 } 074 if (stoped) { 075 stb.append("stoped after ").append(getElapsedTime()).append("ns"); 076 } else { 077 stb.append("running for ").append(getElapsedTime()).append("ns"); 078 } 079 return stb.toString(); 080 081 } 082 }