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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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package com.sun.management.internal;
import java.lang.management.GarbageCollectorMXBean;
import java.lang.management.MemoryUsage;
import javax.management.openmbean.OpenType;
import javax.management.openmbean.SimpleType;
import javax.management.openmbean.CompositeType;
import javax.management.openmbean.OpenDataException;
import com.sun.management.GcInfo;
import sun.management.Util;
/**
* Helper class to build composite data.
*/
public class GcInfoBuilder {
private final GarbageCollectorMXBean gc;
private final String[] poolNames;
private String[] allItemNames;
// GC-specific composite type:
// Each GarbageCollectorMXBean may have different GC-specific attributes
// the CompositeType for the GcInfo could be different.
private CompositeType gcInfoCompositeType;
// GC-specific items
private final int gcExtItemCount;
private final String[] gcExtItemNames;
private final String[] gcExtItemDescs;
private final char[] gcExtItemTypes;
GcInfoBuilder(GarbageCollectorMXBean gc, String[] poolNames) {
this.gc = gc;
this.poolNames = poolNames;
this.gcExtItemCount = getNumGcExtAttributes(gc);
this.gcExtItemNames = new String[gcExtItemCount];
this.gcExtItemDescs = new String[gcExtItemCount];
this.gcExtItemTypes = new char[gcExtItemCount];
// Fill the information about extension attributes
fillGcAttributeInfo(gc, gcExtItemCount, gcExtItemNames,
gcExtItemTypes, gcExtItemDescs);
// lazily build the CompositeType for the GcInfo
// including the GC-specific extension attributes
this.gcInfoCompositeType = null;
}
GcInfo getLastGcInfo() {
MemoryUsage[] usageBeforeGC = new MemoryUsage[poolNames.length];
MemoryUsage[] usageAfterGC = new MemoryUsage[poolNames.length];
Object[] values = new Object[gcExtItemCount];
return getLastGcInfo0(gc, gcExtItemCount, values, gcExtItemTypes,
usageBeforeGC, usageAfterGC);
}
public String[] getPoolNames() {
return poolNames.clone();
}
int getGcExtItemCount() {
return gcExtItemCount;
}
// Returns the CompositeType for the GcInfo including
// the extension attributes
synchronized CompositeType getGcInfoCompositeType() {
if (gcInfoCompositeType != null)
return gcInfoCompositeType;
// First, fill with the attributes in the GcInfo
String[] gcInfoItemNames = GcInfoCompositeData.getBaseGcInfoItemNames();
OpenType<?>[] gcInfoItemTypes = GcInfoCompositeData.getBaseGcInfoItemTypes();
int numGcInfoItems = gcInfoItemNames.length;
int itemCount = numGcInfoItems + gcExtItemCount;
allItemNames = new String[itemCount];
String[] allItemDescs = new String[itemCount];
OpenType<?>[] allItemTypes = new OpenType<?>[itemCount];
System.arraycopy(gcInfoItemNames, 0, allItemNames, 0, numGcInfoItems);
System.arraycopy(gcInfoItemNames, 0, allItemDescs, 0, numGcInfoItems);
System.arraycopy(gcInfoItemTypes, 0, allItemTypes, 0, numGcInfoItems);
// Then fill with the extension GC-specific attributes, if any.
if (gcExtItemCount > 0) {
fillGcAttributeInfo(gc, gcExtItemCount, gcExtItemNames,
gcExtItemTypes, gcExtItemDescs);
System.arraycopy(gcExtItemNames, 0, allItemNames,
numGcInfoItems, gcExtItemCount);
System.arraycopy(gcExtItemDescs, 0, allItemDescs,
numGcInfoItems, gcExtItemCount);
for (int i = numGcInfoItems, j = 0; j < gcExtItemCount; i++, j++) {
switch (gcExtItemTypes[j]) {
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 new RuntimeException(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);
}