OpenJDK 27 · sun.management.MemoryImpl · APIdia, the JavaDoc alternative

Modifier and Type	Field and Description
private final VMManagement	jvm
private static MemoryManagerMXBean[]	mgrs
private static final String[]	notifMsgs
private static final String	notifName
private static final String[]	notifTypes
private static MemoryPoolMXBean[]	pools
private static long	seqNumber

Access	Constructor and Description
pack-priv	MemoryImpl(VMManagement vm) Constructor of MemoryImpl class

Method Summary

Modifier and Type	Method and Description
pack-priv static void	createNotification(String notifType, String poolName, MemoryUsage usage, long count)
public void	gc() Implements java.lang.management.MemoryMXBean.gc. Runs the garbage collector.
public MemoryUsage	getHeapMemoryUsage() Implements java.lang.management.MemoryMXBean.getHeapMemoryUsage. Returns the current memory usage of the heap that is used for object allocation.
pack-priv static synchronized MemoryManagerMXBean[]	getMemoryManagers()
private static native MemoryManagerMXBean[]	getMemoryManagers0()
pack-priv static synchronized MemoryPoolMXBean[]	getMemoryPools()
private static native MemoryPoolMXBean[]	getMemoryPools0()
private native MemoryUsage	getMemoryUsage0(boolean heap)
private static long	getNextSeqNumber()
public MemoryUsage	getNonHeapMemoryUsage() Implements java.lang.management.MemoryMXBean.getNonHeapMemoryUsage. Returns the current memory usage of non-heap memory that is used by the Java virtual machine.
public MBeanNotificationInfo[]	getNotificationInfo() Implements abstract sun.management.NotificationEmitterSupport.getNotificationInfo. Implements javax.management.NotificationBroadcaster.getNotificationInfo. Returns an array indicating, for each notification this MBean may send, the name of the Java class of the notification and the notification type.
private static String	getNotifMsg(String notifType)
public ObjectName	getObjectName() Implements java.lang.management.PlatformManagedObject.getObjectName. Returns an `ObjectName` instance representing the object name of this platform managed object.
public int	getObjectPendingFinalizationCount() Implements java.lang.management.MemoryMXBean.getObjectPendingFinalizationCount. Returns the approximate number of objects for which finalization is pending.
public long	getTotalGcCpuTime() Overrides default java.lang.management.MemoryMXBean.getTotalGcCpuTime. Returns the approximate accumulated time, in nanoseconds, spent in garbage collection (GC).
public boolean	isVerbose() Implements java.lang.management.MemoryMXBean.isVerbose. Tests if verbose output for the memory system is enabled.
public void	setVerbose(boolean value) Implements java.lang.management.MemoryMXBean.setVerbose. Enables or disables verbose output for the memory system.
private native void	setVerboseGC(boolean value)

Inherited from sun.management.NotificationEmitterSupport:: addNotificationListener hasListeners removeNotificationListener removeNotificationListener sendNotification

jvm	back to summary
private final VMManagement jvm

mgrs	back to summary
private static MemoryManagerMXBean[] mgrs

notifMsgs	back to summary
private static final String[] notifMsgs

notifName	back to summary
private static final String notifName

notifTypes	back to summary
private static final String[] notifTypes

pools	back to summary
private static MemoryPoolMXBean[] pools

seqNumber	back to summary
private static long seqNumber

MemoryImpl	back to summary
pack-priv MemoryImpl(VMManagement vm) Constructor of MemoryImpl class

Method Detail

createNotification	back to summary
pack-priv static void createNotification(String notifType, String poolName, MemoryUsage usage, long count)

gc back to summary

gc	back to summary
public void gc() Implements java.lang.management.MemoryMXBean.gc. Doc from java.lang.management.MemoryMXBean.gc. Runs the garbage collector. The call `gc()` is effectively equivalent to the call: System.gc()

public void gc()

Implements java.lang.management.MemoryMXBean.gc.

Doc from java.lang.management.MemoryMXBean.gc.

Runs the garbage collector. The call gc() is effectively equivalent to the call:

System.gc()

getHeapMemoryUsage back to summary

getHeapMemoryUsage	back to summary
public MemoryUsage getHeapMemoryUsage() Implements java.lang.management.MemoryMXBean.getHeapMemoryUsage. Doc from java.lang.management.MemoryMXBean.getHeapMemoryUsage. Returns the current memory usage of the heap that is used for object allocation. The heap consists of one or more memory pools. The `used` and `committed` size of the returned memory usage is the sum of those values of all heap memory pools whereas the `init` and `max` size of the returned memory usage represents the setting of the heap memory which may not be the sum of those of all heap memory pools. The amount of used memory in the returned memory usage is the amount of memory occupied by both live objects and garbage objects that have not been collected, if any. MBeanServer access: The mapped type of `MemoryUsage` is `CompositeData` with attributes as specified in `MemoryUsage`.

public MemoryUsage getHeapMemoryUsage()

Implements java.lang.management.MemoryMXBean.getHeapMemoryUsage.

Doc from java.lang.management.MemoryMXBean.getHeapMemoryUsage.

Returns the current memory usage of the heap that is used for object allocation. The heap consists of one or more memory pools. The used and committed size of the returned memory usage is the sum of those values of all heap memory pools whereas the init and max size of the returned memory usage represents the setting of the heap memory which may not be the sum of those of all heap memory pools.

The amount of used memory in the returned memory usage is the amount of memory occupied by both live objects and garbage objects that have not been collected, if any.

MBeanServer access:
The mapped type of MemoryUsage is CompositeData with attributes as specified in MemoryUsage.

getMemoryManagers	back to summary
pack-priv static synchronized MemoryManagerMXBean[] getMemoryManagers()

getMemoryManagers0	back to summary
private static native MemoryManagerMXBean[] getMemoryManagers0()

getMemoryPools	back to summary
pack-priv static synchronized MemoryPoolMXBean[] getMemoryPools()

getMemoryPools0	back to summary
private static native MemoryPoolMXBean[] getMemoryPools0()

getMemoryUsage0	back to summary
private native MemoryUsage getMemoryUsage0(boolean heap)

getNextSeqNumber	back to summary
private static long getNextSeqNumber()

getNonHeapMemoryUsage back to summary

getNonHeapMemoryUsage	back to summary
public MemoryUsage getNonHeapMemoryUsage() Implements java.lang.management.MemoryMXBean.getNonHeapMemoryUsage. Doc from java.lang.management.MemoryMXBean.getNonHeapMemoryUsage. Returns the current memory usage of non-heap memory that is used by the Java virtual machine. The non-heap memory consists of one or more memory pools. The `used` and `committed` size of the returned memory usage is the sum of those values of all non-heap memory pools whereas the `init` and `max` size of the returned memory usage represents the setting of the non-heap memory which may not be the sum of those of all non-heap memory pools. MBeanServer access: The mapped type of `MemoryUsage` is `CompositeData` with attributes as specified in `MemoryUsage`.

public MemoryUsage getNonHeapMemoryUsage()

Implements java.lang.management.MemoryMXBean.getNonHeapMemoryUsage.

Doc from java.lang.management.MemoryMXBean.getNonHeapMemoryUsage.

Returns the current memory usage of non-heap memory that is used by the Java virtual machine. The non-heap memory consists of one or more memory pools. The used and committed size of the returned memory usage is the sum of those values of all non-heap memory pools whereas the init and max size of the returned memory usage represents the setting of the non-heap memory which may not be the sum of those of all non-heap memory pools.

MBeanServer access:
The mapped type of MemoryUsage is CompositeData with attributes as specified in MemoryUsage.

getNotificationInfo	back to summary
public MBeanNotificationInfo[] getNotificationInfo() Implements abstract sun.management.NotificationEmitterSupport.getNotificationInfo. Implements javax.management.NotificationBroadcaster.getNotificationInfo. Doc from javax.management.NotificationBroadcaster.getNotificationInfo. Returns an array indicating, for each notification this MBean may send, the name of the Java class of the notification and the notification type. It is not illegal for the MBean to send notifications not described in this array. However, some clients of the MBean server may depend on the array being complete for their correct functioning.

getNotificationInfo

back to summary

public MBeanNotificationInfo[] getNotificationInfo()

Implements abstract sun.management.NotificationEmitterSupport.getNotificationInfo.

Implements javax.management.NotificationBroadcaster.getNotificationInfo.

Doc from javax.management.NotificationBroadcaster.getNotificationInfo.

Returns an array indicating, for each notification this MBean may send, the name of the Java class of the notification and the notification type.

It is not illegal for the MBean to send notifications not described in this array. However, some clients of the MBean server may depend on the array being complete for their correct functioning.

getNotifMsg	back to summary
private static String getNotifMsg(String notifType)

getObjectName back to summary

getObjectName	back to summary
public ObjectName getObjectName() Implements java.lang.management.PlatformManagedObject.getObjectName. Doc from java.lang.management.PlatformManagedObject.getObjectName. Returns an `ObjectName` instance representing the object name of this platform managed object.

public ObjectName getObjectName()

Implements java.lang.management.PlatformManagedObject.getObjectName.

Doc from java.lang.management.PlatformManagedObject.getObjectName.

Returns an ObjectName instance representing the object name of this platform managed object.

getObjectPendingFinalizationCount	back to summary
public int getObjectPendingFinalizationCount() Implements java.lang.management.MemoryMXBean.getObjectPendingFinalizationCount. Doc from java.lang.management.MemoryMXBean.getObjectPendingFinalizationCount. Returns the approximate number of objects for which finalization is pending. Annotations @SuppressWarnings:deprecation

getObjectPendingFinalizationCount

back to summary

public int getObjectPendingFinalizationCount()

Implements java.lang.management.MemoryMXBean.getObjectPendingFinalizationCount.

Doc from java.lang.management.MemoryMXBean.getObjectPendingFinalizationCount.

Returns the approximate number of objects for which finalization is pending.

Annotations

@SuppressWarnings:deprecation

getTotalGcCpuTime back to summary

getTotalGcCpuTime	back to summary
public long getTotalGcCpuTime() Overrides default java.lang.management.MemoryMXBean.getTotalGcCpuTime. Doc from java.lang.management.MemoryMXBean.getTotalGcCpuTime. Returns the approximate accumulated time, in nanoseconds, spent in garbage collection (GC). The time spent in spent in GC is the CPU time used by all GC activity, including any overhead, which means the result may be non-zero even if no GC has occurred. This method returns `-1` if the platform does not support this operation or the information is not available.

public long getTotalGcCpuTime()

Overrides default java.lang.management.MemoryMXBean.getTotalGcCpuTime.

Doc from java.lang.management.MemoryMXBean.getTotalGcCpuTime.

Returns the approximate accumulated time, in nanoseconds, spent in garbage collection (GC).

The time spent in spent in GC is the CPU time used by all GC activity, including any overhead, which means the result may be non-zero even if no GC has occurred. This method returns -1 if the platform does not support this operation or the information is not available.

isVerbose	back to summary
public boolean isVerbose() Implements java.lang.management.MemoryMXBean.isVerbose. Doc from java.lang.management.MemoryMXBean.isVerbose. Tests if verbose output for the memory system is enabled.

isVerbose

back to summary

public boolean isVerbose()

Implements java.lang.management.MemoryMXBean.isVerbose.

Doc from java.lang.management.MemoryMXBean.isVerbose.

Tests if verbose output for the memory system is enabled.

setVerbose	back to summary
public void setVerbose(boolean value) Implements java.lang.management.MemoryMXBean.setVerbose. Doc from java.lang.management.MemoryMXBean.setVerbose. Enables or disables verbose output for the memory system. The verbose output information and the output stream to which the verbose information is emitted are implementation dependent. Typically, a Java virtual machine implementation prints a message whenever it frees memory at garbage collection. Each invocation of this method enables or disables verbose output globally.

setVerbose

back to summary

public void setVerbose(boolean value)

Implements java.lang.management.MemoryMXBean.setVerbose.

Doc from java.lang.management.MemoryMXBean.setVerbose.

Enables or disables verbose output for the memory system. The verbose output information and the output stream to which the verbose information is emitted are implementation dependent. Typically, a Java virtual machine implementation prints a message whenever it frees memory at garbage collection.

Each invocation of this method enables or disables verbose output globally.

setVerboseGC	back to summary
private native void setVerboseGC(boolean value)

pack-priv Class MemoryImpl

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