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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.lang.management

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang.management .MemoryPoolMXBean

MemoryPoolMXBean

public interface MemoryPoolMXBean (Code)

MemoryPoolMXBean is an interface used by the management system to access memory pool properties.

ObjectName pattern: java.lang:type=MemoryPool,name=pool_name

since:
1.5

Method Summary
MemoryUsage	getCollectionUsage() The memory usage of the JVM's most recent attempt to recycle unused objects in this pool.
long	getCollectionUsageThreshold() The collection usage threshold (in bytes) of this pool; the default is zero.
long	getCollectionUsageThresholdCount() The number of times the collection usage threshold has been reached or exceeded.
String[]	getMemoryManagerNames() The names of the memory managers that manage this pool; there will be at least one memory manager for each pool.
String	getName() The name of this memory pool.
MemoryUsage	getPeakUsage() The peak memory usage of this pool since JVM startup or since the last reset of the peak.
MemoryType	getType() The memory type of this pool.
MemoryUsage	getUsage() The approximate, current memory usage of this pool.
long	getUsageThreshold() The current usage threshold (in bytes) of this pool.
long	getUsageThresholdCount() The number of times the usage threshold has been met or exceeded.
boolean	isCollectionUsageThresholdExceeded() Indicates whether or not the collection usage threshold has been met or exceeded after the most recent collection.
boolean	isCollectionUsageThresholdSupported() Indicates whether or not this pool supports collection threshold monitoring.
boolean	isUsageThresholdExceeded() Indicates whether or not the usage threshold is currently met or exceeded.
boolean	isUsageThresholdSupported() Indicates whether or not usage threshold monitoring is supported.
boolean	isValid() Indicates whether or not the pool is currently valid.
void	resetPeakUsage() Resets the peak memory usage to the current value.
void	setCollectionUsageThreshold(long threshold) Sets the collection usage threshold (in bytes) for this memory pool.
void	setUsageThreshold(long threshold) Sets the usage threshold (in bytes) for this memory pool.

Method Detail

getCollectionUsage
MemoryUsage getCollectionUsage()(Code)
	The memory usage of the JVM's most recent attempt to recycle unused objects in this pool. If this feature is not supported, then `null` will be returned. A MemoryUsage instance representing the most recentattempt to recycle unused objects; `null` may bereturned to indicated this method is not supported.

getCollectionUsageThreshold
long getCollectionUsageThreshold()(Code)
	The collection usage threshold (in bytes) of this pool; the default is zero. The collection usage threshold value. throws: UnsupportedOperationException - if this is not supported. See Also: MemoryPoolMXBean.isCollectionUsageThresholdSupported()

getCollectionUsageThresholdCount
long getCollectionUsageThresholdCount()(Code)
	The number of times the collection usage threshold has been reached or exceeded. The number of times the collection usage threshold has beenreached or exceeded. throws: UnsupportedOperationException - if this is not supported. See Also: MemoryPoolMXBean.isCollectionUsageThresholdSupported()

getMemoryManagerNames
String[] getMemoryManagerNames()(Code)
	The names of the memory managers that manage this pool; there will be at least one memory manager for each pool. A `String[]` of memory manager names.

getName
String getName()(Code)
	The name of this memory pool. The name of this memory pool.

getPeakUsage
MemoryUsage getPeakUsage()(Code)
	The peak memory usage of this pool since JVM startup or since the last reset of the peak. A MemoryUsage instance representing the peak usage. See Also: MemoryPoolMXBean.resetPeakUsage()

getType
MemoryType getType()(Code)
	The memory type of this pool. The pool's memory type.

getUsage
MemoryUsage getUsage()(Code)
	The approximate, current memory usage of this pool. This method will return `null` if the pool is invalid. A MemoryUsage instance representing the current usage or`null` if the pool is invalid.

getUsageThreshold
long getUsageThreshold()(Code)
	The current usage threshold (in bytes) of this pool. The current usage threshold. throws: UnsupportedOperationException - if this is not supported. See Also: MemoryPoolMXBean.isUsageThresholdSupported()

getUsageThresholdCount
long getUsageThresholdCount()(Code)
	The number of times the usage threshold has been met or exceeded. The number of times the usage threshold has been met or exceeded. throws: UnsupportedOperationException - if this is not supported. See Also: MemoryPoolMXBean.isUsageThresholdSupported()

isCollectionUsageThresholdExceeded
boolean isCollectionUsageThresholdExceeded()(Code)
	Indicates whether or not the collection usage threshold has been met or exceeded after the most recent collection. `true` if the collection usage threshold was met orexceeded, otherwise `false`. throws: UnsupportedOperationException - if this is not supported. See Also: MemoryPoolMXBean.isCollectionUsageThresholdSupported()

isCollectionUsageThresholdSupported
boolean isCollectionUsageThresholdSupported()(Code)
	Indicates whether or not this pool supports collection threshold monitoring. `true` if supported, `false` otherwise.

isUsageThresholdExceeded
boolean isUsageThresholdExceeded()(Code)
	Indicates whether or not the usage threshold is currently met or exceeded. `true` if the usage threshold is met or exceeded,otherwise `false`. throws: UnsupportedOperationException - if this is not supported. See Also: MemoryPoolMXBean.isUsageThresholdSupported()

isUsageThresholdSupported
boolean isUsageThresholdSupported()(Code)
	Indicates whether or not usage threshold monitoring is supported. `true` if supported, otherwise `false`.

isValid
boolean isValid()(Code)
	Indicates whether or not the pool is currently valid. A memory pool may be removed by a JVM and become invalid. `true` if the pool is valid, `false`otherwise.

resetPeakUsage
void resetPeakUsage()(Code)
	Resets the peak memory usage to the current value. throws: SecurityException - if caller doesn't have`ManagementPermission("control")`.

setCollectionUsageThreshold
void setCollectionUsageThreshold(long threshold)(Code)
	Sets the collection usage threshold (in bytes) for this memory pool. Parameters: threshold - The new, non-negative threshold. throws: IllegalArgumentException - if the new `threshold` is either negativeor greater than the maximum memory allowed. throws: UnsupportedOperationException - if this is not supported. throws: SecurityException - if caller doesn't have`ManagementPermission("control")`.

setUsageThreshold
void setUsageThreshold(long threshold)(Code)
	Sets the usage threshold (in bytes) for this memory pool. Parameters: threshold - The new, non-negative threshold. throws: IllegalArgumentException - if the new `threshold` is either negativeor greater than the maximum memory allowed. throws: UnsupportedOperationException - if this is not supported. throws: SecurityException - if caller doesn't have`ManagementPermission("control")`.

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