| MemoryPoolMXBean | java.lang.management |
This MXBean interface allows monitoring of
the current and peak memory usage for a single memory pool. Typical
Java VM implementations segregate garbage-collected heap memory into
two or more memory pools based on the age of the objects. Obtain a
List of MemoryPoolMXBean
instances with ManagementFactory.getMemoryPoolMXBeans(
). getName(
)
and
getType( ) return the name and type of each pool.
getUsage( ) and getPeakUsage( ) return
the current and peak memory usage for the pool in the form of a
MemoryUsage object.If isUsageThresholdSupported(
) returns TRue, you can use
setUsageThreshold(
) to define a memory usage threshold. The
MemoryPoolMXBean then keeps track of threshold
crossings and issues notifications through the
javax.management.NotificationEmitter API. You can
register a javax.management.NotificationListener
to receive these notifications. (Note that the
javax.management package is not covered in this
book.) Use setCollectionUsageThreshold( ) instead
to receive notifications when memory usage exceeds a specified
threshold after a garbage collection pass.public interface MemoryPoolMXBean {
// Public Instance Methods
MemoryUsage getCollectionUsage ( );
long getCollectionUsageThreshold ( );
long getCollectionUsageThresholdCount ( );
String[ ] getMemoryManagerNames ( );
String getName ( );
MemoryUsage getPeakUsage ( );
MemoryType getType ( );
MemoryUsage getUsage ( );
long getUsageThreshold ( );
long getUsageThresholdCount ( );
boolean isCollectionUsageThresholdExceeded ( );
boolean isCollectionUsageThresholdSupported ( );
boolean isUsageThresholdExceeded ( );
boolean isUsageThresholdSupported ( );
boolean isValid ( );
void resetPeakUsage ( );
void setCollectionUsageThreshold (long threhsold );
void setUsageThreshold (long threshold );
}
|
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