| /* |
| * Copyright (c) 2003, 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.corba.se.spi.monitoring; |
| |
| import java.util.*; |
| |
| /** |
| * <p> |
| * |
| * @author Hemanth Puttaswamy |
| * </p> |
| * <p> |
| * StatisticsMonitoredAttribute is provided as a convenience to collect the |
| * Statistics of any entity. The getValue() call will be delegated to the |
| * StatisticsAccumulator set by the user. |
| * </p> |
| */ |
| public class StatisticMonitoredAttribute extends MonitoredAttributeBase { |
| |
| |
| // Every StatisticMonitoredAttribute will have a StatisticAccumulator. User |
| // will use Statisticsaccumulator to accumulate the samples associated with |
| // this Monitored Attribute |
| private StatisticsAccumulator statisticsAccumulator; |
| |
| // Mutex is passed from the user class which is providing the sample values. |
| // getValue() and clearState() is synchronized on this user provided mutex |
| private Object mutex; |
| |
| |
| /////////////////////////////////////// |
| // operations |
| |
| |
| /** |
| * <p> |
| * Constructs the StaisticMonitoredAttribute, builds the required |
| * MonitoredAttributeInfo with Long as the class type and is always |
| * readonly attribute. |
| * </p> |
| * <p> |
| * |
| * @param name Of this attribute |
| * </p> |
| * <p> |
| * @return a StatisticMonitoredAttribute |
| * </p> |
| * <p> |
| * @param desc should provide a good description on the kind of statistics |
| * collected, a good example is "Connection Response Time Stats will Provide the |
| * detailed stats based on the samples provided from every request completion |
| * time" |
| * </p> |
| * <p> |
| * @param s is the StatisticsAcumulator that user will use to accumulate the |
| * samples and this Attribute Object will get the computed statistics values |
| * from. |
| * </p> |
| * <p> |
| * @param mutex using which clearState() and getValue() calls need to be locked. |
| * </p> |
| */ |
| public StatisticMonitoredAttribute(String name, String desc, |
| StatisticsAccumulator s, Object mutex) |
| { |
| super( name ); |
| MonitoredAttributeInfoFactory f = |
| MonitoringFactories.getMonitoredAttributeInfoFactory(); |
| MonitoredAttributeInfo maInfo = f.createMonitoredAttributeInfo( |
| desc, String.class, false, true ); |
| |
| this.setMonitoredAttributeInfo( maInfo ); |
| this.statisticsAccumulator = s; |
| this.mutex = mutex; |
| } // end StatisticMonitoredAttribute |
| |
| |
| |
| /** |
| * Gets the value from the StatisticsAccumulator, the value will be a formatted |
| * String with the computed statistics based on the samples accumulated in the |
| * Statistics Accumulator. |
| */ |
| public Object getValue( ) { |
| synchronized( mutex ) { |
| return statisticsAccumulator.getValue( ); |
| } |
| } |
| |
| /** |
| * Clears the state on Statistics Accumulator, After this call all samples are |
| * treated fresh and the old sample computations are disregarded. |
| */ |
| public void clearState( ) { |
| synchronized( mutex ) { |
| statisticsAccumulator.clearState( ); |
| } |
| } |
| |
| /** |
| * Gets the statistics accumulator associated with StatisticMonitoredAttribute. |
| * Usually, the user don't need to use this method as they can keep the handle |
| * to Accumulator to collect the samples. |
| */ |
| public StatisticsAccumulator getStatisticsAccumulator( ) { |
| return statisticsAccumulator; |
| } |
| } // end StatisticMonitoredAttribute |