sun/management/GcInfoBuilder.java

	GcInfoBuilder.java revision 178
0N/A/*
3909N/A * Copyright 2003-2004 Sun Microsystems, Inc.  All Rights Reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
2362N/A * published by the Free Software Foundation.  Sun designates this
0N/A * particular file as subject to the "Classpath" exception as provided
2362N/A * by Sun in the LICENSE file that accompanied this code.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0N/A *
2362N/A * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
2362N/A * CA 95054 USA or visit www.sun.com if you need additional information or
2362N/A * have any questions.
0N/A */
0N/Apackage sun.management;
0N/A
0N/Aimport java.lang.management.GarbageCollectorMXBean;
0N/Aimport java.lang.management.MemoryUsage;
0N/Aimport javax.management.openmbean.OpenType;
0N/Aimport javax.management.openmbean.SimpleType;
0N/Aimport javax.management.openmbean.TabularType;
0N/Aimport javax.management.openmbean.TabularData;
0N/Aimport javax.management.openmbean.TabularDataSupport;
0N/Aimport javax.management.openmbean.CompositeType;
0N/Aimport javax.management.openmbean.CompositeData;
0N/Aimport javax.management.openmbean.CompositeDataSupport;
0N/Aimport javax.management.openmbean.OpenDataException;
0N/Aimport com.sun.management.GcInfo;
0N/A
0N/A/**
0N/A * Helper class to build composite data.
0N/A */
0N/Apublic class GcInfoBuilder {
0N/A    private final GarbageCollectorMXBean gc;
0N/A    private final String[] poolNames;
0N/A    private String[] allItemNames;
0N/A
0N/A    // GC-specific composite type:
0N/A    // Each GarbageCollectorMXBean may have different GC-specific attributes
0N/A    // the CompositeType for the GcInfo could be different.
0N/A    private CompositeType gcInfoCompositeType;
0N/A
0N/A    // GC-specific items
0N/A    private final int gcExtItemCount;
0N/A    private final String[] gcExtItemNames;
0N/A    private final String[] gcExtItemDescs;
0N/A    private final char[] gcExtItemTypes;
0N/A
0N/A    GcInfoBuilder(GarbageCollectorMXBean gc, String[] poolNames) {
0N/A        this.gc = gc;
0N/A        this.poolNames = poolNames;
0N/A        this.gcExtItemCount = getNumGcExtAttributes(gc);
0N/A        this.gcExtItemNames = new String[gcExtItemCount];
0N/A        this.gcExtItemDescs = new String[gcExtItemCount];
0N/A        this.gcExtItemTypes = new char[gcExtItemCount];
0N/A
0N/A        // Fill the information about extension attributes
0N/A        fillGcAttributeInfo(gc, gcExtItemCount, gcExtItemNames,
0N/A                            gcExtItemTypes, gcExtItemDescs);
0N/A
0N/A        // lazily build the CompositeType for the GcInfo
0N/A        // including the GC-specific extension attributes
0N/A        this.gcInfoCompositeType = null;
0N/A    }
0N/A
0N/A    GcInfo getLastGcInfo() {
0N/A        MemoryUsage[] usageBeforeGC = new MemoryUsage[poolNames.length];
0N/A        MemoryUsage[] usageAfterGC = new MemoryUsage[poolNames.length];
0N/A        Object[] values = new Object[gcExtItemCount];
0N/A
0N/A        return getLastGcInfo0(gc, gcExtItemCount, values, gcExtItemTypes,
0N/A                              usageBeforeGC, usageAfterGC);
0N/A    }
0N/A
0N/A    public String[] getPoolNames() {
0N/A        return poolNames;
0N/A    }
0N/A
0N/A    int getGcExtItemCount() {
0N/A        return gcExtItemCount;
0N/A    }
0N/A
0N/A    // Returns the CompositeType for the GcInfo including
0N/A    // the extension attributes
0N/A    synchronized CompositeType getGcInfoCompositeType() {
0N/A        if (gcInfoCompositeType != null)
0N/A            return gcInfoCompositeType;
0N/A
0N/A        // First, fill with the attributes in the GcInfo
0N/A        String[] gcInfoItemNames = GcInfoCompositeData.getBaseGcInfoItemNames();
0N/A        OpenType[] gcInfoItemTypes = GcInfoCompositeData.getBaseGcInfoItemTypes();
0N/A        int numGcInfoItems = gcInfoItemNames.length;
0N/A
0N/A        int itemCount = numGcInfoItems + gcExtItemCount;
0N/A        allItemNames = new String[itemCount];
0N/A        String[] allItemDescs = new String[itemCount];
0N/A        OpenType[] allItemTypes = new OpenType[itemCount];
0N/A
0N/A        System.arraycopy(gcInfoItemNames, 0, allItemNames, 0, numGcInfoItems);
0N/A        System.arraycopy(gcInfoItemNames, 0, allItemDescs, 0, numGcInfoItems);
0N/A        System.arraycopy(gcInfoItemTypes, 0, allItemTypes, 0, numGcInfoItems);
0N/A
0N/A        // Then fill with the extension GC-specific attributes, if any.
0N/A        if (gcExtItemCount > 0) {
459N/A            fillGcAttributeInfo(gc, gcExtItemCount, gcExtItemNames,
0N/A                                gcExtItemTypes, gcExtItemDescs);
0N/A            System.arraycopy(gcExtItemNames, 0, allItemNames,
0N/A                             numGcInfoItems, gcExtItemCount);
0N/A            System.arraycopy(gcExtItemDescs, 0, allItemDescs,
0N/A                             numGcInfoItems, gcExtItemCount);
0N/A            for (int i = numGcInfoItems, j = 0; j < gcExtItemCount; i++, j++) {
0N/A                switch (gcExtItemTypes[j]) {
0N/A                    case 'Z':
                        allItemTypes[i] = SimpleType.BOOLEAN;
                        break;
                    case 'B':
                        allItemTypes[i] = SimpleType.BYTE;
                        break;
                    case 'C':
                        allItemTypes[i] = SimpleType.CHARACTER;
                        break;
                    case 'S':
                        allItemTypes[i] = SimpleType.SHORT;
                        break;
                    case 'I':
                        allItemTypes[i] = SimpleType.INTEGER;
                        break;
                    case 'J':
                        allItemTypes[i] = SimpleType.LONG;
                        break;
                    case 'F':
                        allItemTypes[i] = SimpleType.FLOAT;
                        break;
                    case 'D':
                        allItemTypes[i] = SimpleType.DOUBLE;
                        break;
                    default:
                        throw new AssertionError(
                            "Unsupported type [" + gcExtItemTypes[i] + "]");
                }
            }
        }

        CompositeType gict = null;
        try {
            final String typeName =
                "sun.management." + gc.getName() + ".GcInfoCompositeType";

            gict = new CompositeType(typeName,
                                     "CompositeType for GC info for " +
                                         gc.getName(),
                                     allItemNames,
                                     allItemDescs,
                                     allItemTypes);
        } catch (OpenDataException e) {
            // shouldn't reach here
            throw Util.newException(e);
        }
        gcInfoCompositeType = gict;

        return gcInfoCompositeType;
    }

    synchronized String[] getItemNames() {
        if (allItemNames == null) {
            // initialize when forming the composite type
            getGcInfoCompositeType();
        }
        return allItemNames;
    }

    // Retrieve information about extension attributes
    private native int getNumGcExtAttributes(GarbageCollectorMXBean gc);
    private native void fillGcAttributeInfo(GarbageCollectorMXBean gc,
                                            int numAttributes,
                                            String[] attributeNames,
                                            char[] types,
                                            String[] descriptions);

    /**
     * Returns the last GcInfo
     *
     * @param gc GarbageCollectorMXBean that the gc info is associated with.
     * @param numExtAtts number of extension attributes
     * @param extAttValues Values of extension attributes to be filled.
     * @param before Memory usage before GC to be filled.
     * @param after Memory usage after GC to be filled.
     */
    private native GcInfo getLastGcInfo0(GarbageCollectorMXBean gc,
                                         int numExtAtts,
                                         Object[] extAttValues,
                                         char[] extAttTypes,
                                         MemoryUsage[] before,
                                         MemoryUsage[] after);
}