| /** |
| * 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 org.apache.activemq.util; |
| |
| /** |
| * A very simple stop watch. |
| * <p/> |
| * This implementation is not thread safe and can only time one task at any given time. |
| */ |
| public final class StopWatch { |
| |
| private long start; |
| private long stop; |
| |
| /** |
| * Starts the stop watch |
| */ |
| public StopWatch() { |
| this(true); |
| } |
| |
| /** |
| * Creates the stop watch |
| * |
| * @param started whether it should start immediately |
| */ |
| public StopWatch(boolean started) { |
| if (started) { |
| restart(); |
| } |
| } |
| |
| /** |
| * Starts or restarts the stop watch |
| */ |
| public void restart() { |
| start = System.currentTimeMillis(); |
| stop = 0; |
| } |
| |
| /** |
| * Stops the stop watch |
| * |
| * @return the time taken in milliseconds. |
| */ |
| public long stop() { |
| stop = System.currentTimeMillis(); |
| return taken(); |
| } |
| |
| /** |
| * Returns the time taken in milliseconds. |
| * |
| * @return time in milliseconds |
| */ |
| public long taken() { |
| if (start > 0 && stop > 0) { |
| return stop - start; |
| } else if (start > 0) { |
| return System.currentTimeMillis() - start; |
| } else { |
| return 0; |
| } |
| } |
| } |