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package sun.management;

import java.lang.management.MemoryUsage;
import javax.management.openmbean.CompositeType;
import javax.management.openmbean.CompositeData;
import javax.management.openmbean.CompositeDataSupport;
import javax.management.openmbean.OpenDataException;

A CompositeData for MemoryUsage for the local management support. This class avoids the performance penalty paid to the construction of a CompositeData use in the local case.
/** * A CompositeData for MemoryUsage for the local management support. * This class avoids the performance penalty paid to the * construction of a CompositeData use in the local case. */
public class MemoryUsageCompositeData extends LazyCompositeData { private final MemoryUsage usage; private MemoryUsageCompositeData(MemoryUsage u) { this.usage = u; } public MemoryUsage getMemoryUsage() { return usage; } public static CompositeData toCompositeData(MemoryUsage u) { MemoryUsageCompositeData mucd = new MemoryUsageCompositeData(u); return mucd.getCompositeData(); } protected CompositeData getCompositeData() { // CONTENTS OF THIS ARRAY MUST BE SYNCHRONIZED WITH // memoryUsageItemNames! final Object[] memoryUsageItemValues = { new Long(usage.getInit()), new Long(usage.getUsed()), new Long(usage.getCommitted()), new Long(usage.getMax()), }; try { return new CompositeDataSupport(memoryUsageCompositeType, memoryUsageItemNames, memoryUsageItemValues); } catch (OpenDataException e) { // Should never reach here throw new AssertionError(e); } } private static final CompositeType memoryUsageCompositeType; static { try { memoryUsageCompositeType = (CompositeType) MappedMXBeanType.toOpenType(MemoryUsage.class); } catch (OpenDataException e) { // Should never reach here throw new AssertionError(e); } } static CompositeType getMemoryUsageCompositeType() { return memoryUsageCompositeType; } private static final String INIT = "init"; private static final String USED = "used"; private static final String COMMITTED = "committed"; private static final String MAX = "max"; private static final String[] memoryUsageItemNames = { INIT, USED, COMMITTED, MAX, }; public static long getInit(CompositeData cd) { return getLong(cd, INIT); } public static long getUsed(CompositeData cd) { return getLong(cd, USED); } public static long getCommitted(CompositeData cd) { return getLong(cd, COMMITTED); } public static long getMax(CompositeData cd) { return getLong(cd, MAX); }
Validate if the input CompositeData has the expected CompositeType (i.e. contain all attributes with expected names and types).
/** Validate if the input CompositeData has the expected * CompositeType (i.e. contain all attributes with expected * names and types). */
public static void validateCompositeData(CompositeData cd) { if (cd == null) { throw new NullPointerException("Null CompositeData"); } if (!isTypeMatched(memoryUsageCompositeType, cd.getCompositeType())) { throw new IllegalArgumentException( "Unexpected composite type for MemoryUsage"); } } private static final long serialVersionUID = -8504291541083874143L; }