290 lines
9.1 KiB
Java
290 lines
9.1 KiB
Java
/*
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* Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.management;
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import java.lang.management.MemoryUsage;
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import javax.management.openmbean.CompositeData;
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import javax.management.openmbean.CompositeDataView;
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import javax.management.openmbean.CompositeType;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.List;
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import sun.management.GcInfoCompositeData;
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import sun.management.GcInfoBuilder;
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/**
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* Garbage collection information. It contains the following
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* information for one garbage collection as well as GC-specific
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* attributes:
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* <blockquote>
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* <ul>
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* <li>Start time</li>
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* <li>End time</li>
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* <li>Duration</li>
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* <li>Memory usage before the collection starts</li>
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* <li>Memory usage after the collection ends</li>
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* </ul>
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* </blockquote>
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*
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* <p>
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* <tt>GcInfo</tt> is a {@link CompositeData CompositeData}
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* The GC-specific attributes can be obtained via the CompositeData
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* interface. This is a historical relic, and other classes should
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* not copy this pattern. Use {@link CompositeDataView} instead.
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*
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* <h4>MXBean Mapping</h4>
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* <tt>GcInfo</tt> is mapped to a {@link CompositeData CompositeData}
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* with attributes as specified in the {@link #from from} method.
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*
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* @author Mandy Chung
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* @since 1.5
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*/
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@jdk.Exported
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public class GcInfo implements CompositeData, CompositeDataView {
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private final long index;
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private final long startTime;
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private final long endTime;
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private final Map<String, MemoryUsage> usageBeforeGc;
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private final Map<String, MemoryUsage> usageAfterGc;
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private final Object[] extAttributes;
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private final CompositeData cdata;
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private final GcInfoBuilder builder;
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private GcInfo(GcInfoBuilder builder,
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long index, long startTime, long endTime,
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MemoryUsage[] muBeforeGc,
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MemoryUsage[] muAfterGc,
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Object[] extAttributes) {
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this.builder = builder;
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this.index = index;
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this.startTime = startTime;
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this.endTime = endTime;
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String[] poolNames = builder.getPoolNames();
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this.usageBeforeGc = new HashMap<String, MemoryUsage>(poolNames.length);
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this.usageAfterGc = new HashMap<String, MemoryUsage>(poolNames.length);
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for (int i = 0; i < poolNames.length; i++) {
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this.usageBeforeGc.put(poolNames[i], muBeforeGc[i]);
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this.usageAfterGc.put(poolNames[i], muAfterGc[i]);
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}
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this.extAttributes = extAttributes;
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this.cdata = new GcInfoCompositeData(this, builder, extAttributes);
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}
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private GcInfo(CompositeData cd) {
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GcInfoCompositeData.validateCompositeData(cd);
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this.index = GcInfoCompositeData.getId(cd);
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this.startTime = GcInfoCompositeData.getStartTime(cd);
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this.endTime = GcInfoCompositeData.getEndTime(cd);
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this.usageBeforeGc = GcInfoCompositeData.getMemoryUsageBeforeGc(cd);
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this.usageAfterGc = GcInfoCompositeData.getMemoryUsageAfterGc(cd);
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this.extAttributes = null;
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this.builder = null;
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this.cdata = cd;
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}
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/**
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* Returns the identifier of this garbage collection which is
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* the number of collections that this collector has done.
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*
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* @return the identifier of this garbage collection which is
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* the number of collections that this collector has done.
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*/
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public long getId() {
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return index;
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}
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/**
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* Returns the start time of this GC in milliseconds
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* since the Java virtual machine was started.
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*
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* @return the start time of this GC.
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*/
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public long getStartTime() {
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return startTime;
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}
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/**
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* Returns the end time of this GC in milliseconds
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* since the Java virtual machine was started.
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*
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* @return the end time of this GC.
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*/
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public long getEndTime() {
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return endTime;
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}
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/**
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* Returns the elapsed time of this GC in milliseconds.
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*
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* @return the elapsed time of this GC in milliseconds.
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*/
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public long getDuration() {
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return endTime - startTime;
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}
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/**
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* Returns the memory usage of all memory pools
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* at the beginning of this GC.
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* This method returns
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* a <tt>Map</tt> of the name of a memory pool
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* to the memory usage of the corresponding
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* memory pool before GC starts.
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*
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* @return a <tt>Map</tt> of memory pool names to the memory
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* usage of a memory pool before GC starts.
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*/
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public Map<String, MemoryUsage> getMemoryUsageBeforeGc() {
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return Collections.unmodifiableMap(usageBeforeGc);
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}
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/**
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* Returns the memory usage of all memory pools
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* at the end of this GC.
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* This method returns
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* a <tt>Map</tt> of the name of a memory pool
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* to the memory usage of the corresponding
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* memory pool when GC finishes.
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*
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* @return a <tt>Map</tt> of memory pool names to the memory
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* usage of a memory pool when GC finishes.
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*/
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public Map<String, MemoryUsage> getMemoryUsageAfterGc() {
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return Collections.unmodifiableMap(usageAfterGc);
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}
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/**
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* Returns a <tt>GcInfo</tt> object represented by the
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* given <tt>CompositeData</tt>. The given
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* <tt>CompositeData</tt> must contain
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* all the following attributes:
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*
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* <p>
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* <blockquote>
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* <table border>
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* <tr>
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* <th align=left>Attribute Name</th>
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* <th align=left>Type</th>
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* </tr>
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* <tr>
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* <td>index</td>
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* <td><tt>java.lang.Long</tt></td>
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* </tr>
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* <tr>
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* <td>startTime</td>
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* <td><tt>java.lang.Long</tt></td>
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* </tr>
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* <tr>
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* <td>endTime</td>
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* <td><tt>java.lang.Long</tt></td>
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* </tr>
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* <tr>
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* <td>memoryUsageBeforeGc</td>
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* <td><tt>javax.management.openmbean.TabularData</tt></td>
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* </tr>
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* <tr>
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* <td>memoryUsageAfterGc</td>
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* <td><tt>javax.management.openmbean.TabularData</tt></td>
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* </tr>
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* </table>
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* </blockquote>
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*
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* @throws IllegalArgumentException if <tt>cd</tt> does not
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* represent a <tt>GcInfo</tt> object with the attributes
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* described above.
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*
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* @return a <tt>GcInfo</tt> object represented by <tt>cd</tt>
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* if <tt>cd</tt> is not <tt>null</tt>; <tt>null</tt> otherwise.
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*/
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public static GcInfo from(CompositeData cd) {
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if (cd == null) {
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return null;
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}
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if (cd instanceof GcInfoCompositeData) {
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return ((GcInfoCompositeData) cd).getGcInfo();
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} else {
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return new GcInfo(cd);
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}
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}
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// Implementation of the CompositeData interface
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public boolean containsKey(String key) {
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return cdata.containsKey(key);
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}
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public boolean containsValue(Object value) {
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return cdata.containsValue(value);
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}
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public boolean equals(Object obj) {
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return cdata.equals(obj);
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}
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public Object get(String key) {
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return cdata.get(key);
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}
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public Object[] getAll(String[] keys) {
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return cdata.getAll(keys);
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}
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public CompositeType getCompositeType() {
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return cdata.getCompositeType();
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}
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public int hashCode() {
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return cdata.hashCode();
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}
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public String toString() {
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return cdata.toString();
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}
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public Collection values() {
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return cdata.values();
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}
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/**
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* <p>Return the {@code CompositeData} representation of this
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* {@code GcInfo}, including any GC-specific attributes. The
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* returned value will have at least all the attributes described
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* in the {@link #from(CompositeData) from} method, plus optionally
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* other attributes.
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*
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* @param ct the {@code CompositeType} that the caller expects.
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* This parameter is ignored and can be null.
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*
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* @return the {@code CompositeData} representation.
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*/
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public CompositeData toCompositeData(CompositeType ct) {
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return cdata;
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}
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}
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