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/**
 * 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.
 * 

* 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; } } }





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