aoqi@0: /*
aoqi@0:  * Copyright (c) 2009, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.  Oracle designates this
aoqi@0:  * particular file as subject to the "Classpath" exception as provided
aoqi@0:  * by Oracle in the LICENSE file that accompanied this code.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: 
aoqi@0: 
aoqi@0: package com.sun.org.glassfish.external.statistics.impl;
aoqi@0: import com.sun.org.glassfish.external.statistics.RangeStatistic;
aoqi@0: import java.util.Map;
aoqi@0: import java.lang.reflect.*;
aoqi@0: 
aoqi@0: /**
aoqi@0:  * @author Sreenivas Munnangi
aoqi@0:  */
aoqi@0: public final class RangeStatisticImpl extends StatisticImpl
aoqi@0:     implements RangeStatistic, InvocationHandler {
aoqi@0: 
aoqi@0:     private long currentVal = 0L;
aoqi@0:     private long highWaterMark = Long.MIN_VALUE;
aoqi@0:     private long lowWaterMark = Long.MAX_VALUE;
aoqi@0:     private final long initCurrentVal;
aoqi@0:     private final long initHighWaterMark;
aoqi@0:     private final long initLowWaterMark;
aoqi@0: 
aoqi@0:     private final RangeStatistic rs =
aoqi@0:             (RangeStatistic) Proxy.newProxyInstance(
aoqi@0:             RangeStatistic.class.getClassLoader(),
aoqi@0:             new Class[] { RangeStatistic.class },
aoqi@0:             this);
aoqi@0: 
aoqi@0:     public RangeStatisticImpl(long curVal, long highMark, long lowMark,
aoqi@0:                               String name, String unit, String desc,
aoqi@0:                               long startTime, long sampleTime) {
aoqi@0:         super(name, unit, desc, startTime, sampleTime);
aoqi@0:         currentVal = curVal;
aoqi@0:         initCurrentVal = curVal;
aoqi@0:         highWaterMark = highMark;
aoqi@0:         initHighWaterMark = highMark;
aoqi@0:         lowWaterMark = lowMark;
aoqi@0:         initLowWaterMark = lowMark;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public synchronized RangeStatistic getStatistic() {
aoqi@0:         return rs;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public synchronized Map getStaticAsMap() {
aoqi@0:         Map m = super.getStaticAsMap();
aoqi@0:         m.put("current", getCurrent());
aoqi@0:         m.put("lowwatermark", getLowWaterMark());
aoqi@0:         m.put("highwatermark", getHighWaterMark());
aoqi@0:         return m;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public synchronized long getCurrent() {
aoqi@0:         return currentVal;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public synchronized void setCurrent(long curVal) {
aoqi@0:         currentVal = curVal;
aoqi@0:         lowWaterMark = (curVal >= lowWaterMark ? lowWaterMark : curVal);
aoqi@0:         highWaterMark = (curVal >= highWaterMark ? curVal : highWaterMark);
aoqi@0:         sampleTime = System.currentTimeMillis();
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Returns the highest value of this statistic, since measurement started.
aoqi@0:      */
aoqi@0:     public synchronized long getHighWaterMark() {
aoqi@0:         return highWaterMark;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public synchronized void setHighWaterMark(long hwm) {
aoqi@0:         highWaterMark = hwm;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Returns the lowest value of this statistic, since measurement started.
aoqi@0:      */
aoqi@0:     public synchronized long getLowWaterMark() {
aoqi@0:         return lowWaterMark;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public synchronized void setLowWaterMark(long lwm) {
aoqi@0:         lowWaterMark = lwm;
aoqi@0:     }
aoqi@0: 
aoqi@0:     @Override
aoqi@0:     public synchronized void reset() {
aoqi@0:         super.reset();
aoqi@0:         currentVal = initCurrentVal;
aoqi@0:         highWaterMark = initHighWaterMark;
aoqi@0:         lowWaterMark = initLowWaterMark;
aoqi@0:         sampleTime = -1L;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public synchronized String toString() {
aoqi@0:         return super.toString() + NEWLINE +
aoqi@0:             "Current: " + getCurrent() + NEWLINE +
aoqi@0:             "LowWaterMark: " + getLowWaterMark() + NEWLINE +
aoqi@0:             "HighWaterMark: " + getHighWaterMark();
aoqi@0:     }
aoqi@0: 
aoqi@0:     // todo: equals implementation
aoqi@0:     public Object invoke(Object proxy, Method m, Object[] args) throws Throwable {
aoqi@0:         checkMethod(m);
aoqi@0: 
aoqi@0:         Object result;
aoqi@0:         try {
aoqi@0:             result = m.invoke(this, args);
aoqi@0:         } catch (InvocationTargetException e) {
aoqi@0:             throw e.getTargetException();
aoqi@0:         } catch (Exception e) {
aoqi@0:             throw new RuntimeException("unexpected invocation exception: " +
aoqi@0:                        e.getMessage());
aoqi@0:         }
aoqi@0:         return result;
aoqi@0:     }
aoqi@0: }