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package sun.management;

import java.lang.management.MonitorInfo;
import javax.management.openmbean.CompositeType;
import javax.management.openmbean.CompositeData;
import javax.management.openmbean.CompositeDataSupport;
import javax.management.openmbean.OpenDataException;
import java.util.Set;

A CompositeData for MonitorInfo 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 MonitorInfo 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 MonitorInfoCompositeData extends LazyCompositeData { private final MonitorInfo lock; private MonitorInfoCompositeData(MonitorInfo mi) { this.lock = mi; } public MonitorInfo getMonitorInfo() { return lock; } public static CompositeData toCompositeData(MonitorInfo mi) { MonitorInfoCompositeData micd = new MonitorInfoCompositeData(mi); return micd.getCompositeData(); } protected CompositeData getCompositeData() { // CONTENTS OF THIS ARRAY MUST BE SYNCHRONIZED WITH // monitorInfoItemNames! int len = monitorInfoItemNames.length; Object[] values = new Object[len]; CompositeData li = LockInfoCompositeData.toCompositeData(lock); for (int i = 0; i < len; i++) { String item = monitorInfoItemNames[i]; if (item.equals(LOCKED_STACK_FRAME)) { StackTraceElement ste = lock.getLockedStackFrame(); values[i] = (ste != null ? StackTraceElementCompositeData. toCompositeData(ste) : null); } else if (item.equals(LOCKED_STACK_DEPTH)) { values[i] = lock.getLockedStackDepth(); } else { values[i] = li.get(item); } } try { return new CompositeDataSupport(monitorInfoCompositeType, monitorInfoItemNames, values); } catch (OpenDataException e) { // Should never reach here throw new AssertionError(e); } } private static final CompositeType monitorInfoCompositeType; private static final String[] monitorInfoItemNames; static { try { monitorInfoCompositeType = (CompositeType) MappedMXBeanType.toOpenType(MonitorInfo.class); Set<String> s = monitorInfoCompositeType.keySet(); monitorInfoItemNames = s.toArray(new String[0]); } catch (OpenDataException e) { // Should never reach here throw new AssertionError(e); } } static CompositeType getMonitorInfoCompositeType() { return monitorInfoCompositeType; } private static final String CLASS_NAME = "className"; private static final String IDENTITY_HASH_CODE = "identityHashCode"; private static final String LOCKED_STACK_FRAME = "lockedStackFrame"; private static final String LOCKED_STACK_DEPTH = "lockedStackDepth"; public static String getClassName(CompositeData cd) { return getString(cd, CLASS_NAME); } public static int getIdentityHashCode(CompositeData cd) { return getInt(cd, IDENTITY_HASH_CODE); } public static StackTraceElement getLockedStackFrame(CompositeData cd) { CompositeData ste = (CompositeData) cd.get(LOCKED_STACK_FRAME); if (ste != null) { return StackTraceElementCompositeData.from(ste); } else { return null; } } public static int getLockedStackDepth(CompositeData cd) { return getInt(cd, LOCKED_STACK_DEPTH); }
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(monitorInfoCompositeType, cd.getCompositeType())) { throw new IllegalArgumentException( "Unexpected composite type for MonitorInfo"); } } private static final long serialVersionUID = -5825215591822908529L; }