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view src/org/eclipse/jetty/util/statistic/CounterStatistic.java @ 804:9f5ba30722bb
remove org.eclipse.jetty.util.ajax
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Wed, 07 Sep 2016 21:28:02 -0600 |
parents | 3428c60d7cfc |
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// // ======================================================================== // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd. // ------------------------------------------------------------------------ // All rights reserved. This program and the accompanying materials // are made available under the terms of the Eclipse Public License v1.0 // and Apache License v2.0 which accompanies this distribution. // // The Eclipse Public License is available at // http://www.eclipse.org/legal/epl-v10.html // // The Apache License v2.0 is available at // http://www.opensource.org/licenses/apache2.0.php // // You may elect to redistribute this code under either of these licenses. // ======================================================================== // package org.eclipse.jetty.util.statistic; import java.util.concurrent.atomic.AtomicLong; import org.eclipse.jetty.util.Atomics; /* ------------------------------------------------------------ */ /** Statistics on a counter value. * <p> * Keep total, current and maximum values of a counter that * can be incremented and decremented. The total refers only * to increments. * */ public class CounterStatistic { protected final AtomicLong _max = new AtomicLong(); protected final AtomicLong _curr = new AtomicLong(); protected final AtomicLong _total = new AtomicLong(); /* ------------------------------------------------------------ */ public void reset() { reset(0); } /* ------------------------------------------------------------ */ public void reset(final long value) { _max.set(value); _curr.set(value); _total.set(0); // total always set to 0 to properly calculate cumulative total } /* ------------------------------------------------------------ */ /** * @param delta the amount to add to the count */ public void add(final long delta) { long value=_curr.addAndGet(delta); if (delta > 0) _total.addAndGet(delta); Atomics.updateMax(_max,value); } /* ------------------------------------------------------------ */ /** * @param delta the amount to subtract the count by. */ public void subtract(final long delta) { add(-delta); } /* ------------------------------------------------------------ */ /** */ public void increment() { add(1); } /* ------------------------------------------------------------ */ /** */ public void decrement() { add(-1); } /* ------------------------------------------------------------ */ /** * @return max value */ public long getMax() { return _max.get(); } /* ------------------------------------------------------------ */ /** * @return current value */ public long getCurrent() { return _curr.get(); } /* ------------------------------------------------------------ */ /** * @return total value */ public long getTotal() { return _total.get(); } }