jdk/src/share/classes/sun/management/MemoryUsageCompositeData.java
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/*
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 * Copyright 2004 Sun Microsystems, Inc.  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.  Sun designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 */
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package sun.management;
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import java.lang.management.MemoryUsage;
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import javax.management.openmbean.CompositeType;
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import javax.management.openmbean.CompositeData;
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import javax.management.openmbean.CompositeDataSupport;
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import javax.management.openmbean.OpenDataException;
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/**
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 * A CompositeData for MemoryUsage for the local management support.
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 * This class avoids the performance penalty paid to the
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 * construction of a CompositeData use in the local case.
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 */
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public class MemoryUsageCompositeData extends LazyCompositeData {
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    private final MemoryUsage usage;
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    private MemoryUsageCompositeData(MemoryUsage u) {
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        this.usage = u;
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    }
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    public MemoryUsage getMemoryUsage() {
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        return usage;
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    }
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    public static CompositeData toCompositeData(MemoryUsage u) {
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        MemoryUsageCompositeData mucd = new MemoryUsageCompositeData(u);
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        return mucd.getCompositeData();
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    }
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    protected CompositeData getCompositeData() {
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        // CONTENTS OF THIS ARRAY MUST BE SYNCHRONIZED WITH
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        // memoryUsageItemNames!
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        final Object[] memoryUsageItemValues = {
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            new Long(usage.getInit()),
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            new Long(usage.getUsed()),
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            new Long(usage.getCommitted()),
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            new Long(usage.getMax()),
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        };
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        try {
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            return new CompositeDataSupport(memoryUsageCompositeType,
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                                            memoryUsageItemNames,
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                                            memoryUsageItemValues);
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        } catch (OpenDataException e) {
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            // Should never reach here
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            throw Util.newInternalError(e);
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        }
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    }
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    private static final CompositeType memoryUsageCompositeType;
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    static {
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        try {
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            memoryUsageCompositeType = (CompositeType)
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                MappedMXBeanType.toOpenType(MemoryUsage.class);
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        } catch (OpenDataException e) {
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            // Should never reach here
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            throw Util.newInternalError(e);
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        }
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    }
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    static CompositeType getMemoryUsageCompositeType() {
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        return memoryUsageCompositeType;
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    }
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    private static final String INIT      = "init";
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    private static final String USED      = "used";
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    private static final String COMMITTED = "committed";
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    private static final String MAX       = "max";
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    private static final String[] memoryUsageItemNames = {
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        INIT,
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        USED,
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        COMMITTED,
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        MAX,
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    };
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    public static long getInit(CompositeData cd) {
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        return getLong(cd, INIT);
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    }
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    public static long getUsed(CompositeData cd) {
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        return getLong(cd, USED);
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    }
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    public static long getCommitted(CompositeData cd) {
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        return getLong(cd, COMMITTED);
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    }
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    public static long getMax(CompositeData cd) {
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        return getLong(cd, MAX);
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    }
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    /** Validate if the input CompositeData has the expected
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     * CompositeType (i.e. contain all attributes with expected
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     * names and types).
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     */
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    public static void validateCompositeData(CompositeData cd) {
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        if (cd == null) {
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            throw new NullPointerException("Null CompositeData");
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        }
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        if (!isTypeMatched(memoryUsageCompositeType, cd.getCompositeType())) {
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            throw new IllegalArgumentException(
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                "Unexpected composite type for MemoryUsage");
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        }
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    }
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}