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