gnu.java.lang.management
Class MemoryPoolMXBeanImpl
- DynamicMBean, MemoryPoolMXBean
Provides access to information about one of the memory
resources or pools used by the current invocation of the
virtual machine. An instance of this bean for each memory
pool is obtained by calling
ManagementFactory.getMemoryPoolMXBeans().
cacheMBeanInfo, getAttribute, getAttributes, getCachedMBeanInfo, getClassName, getConstructors, getDescription, getDescription, getDescription, getDescription, getDescription, getDescription, getDescription, getImpact, getImplementation, getImplementationClass, getMBeanInfo, getMBeanInterface, getParameterName, getParameterName, invoke, setAttribute, setAttributes, setImplementation |
clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
getCollectionUsage
public MemoryUsage getCollectionUsage()
Returns memory usage statistics after a best-effort attempt
has been made to remove unused objects from the pool. This
method is designed for use by the pools of garbage collectors,
in order to monitor the amount of memory used after collections.
It will return null if such functionality is
unsupported by the memory pool represented by this bean.
- getCollectionUsage in interface MemoryPoolMXBean
- the memory usage of the memory pool after the most
recent garbage collection cycle, or
null
if this operation is not supported.
getPeakUsage
public MemoryUsage getPeakUsage()
Returns memory usage statistics for the peak memory usage
of the pool. The peak is the maximum memory usage occurring
since the virtual machine was started or since the peak
was reset by
MemoryPoolMXBean.resetPeakUsage(). The return value
may be
null if this pool is no longer valid.
- getPeakUsage in interface MemoryPoolMXBean
- the memory usage of the memory pool at its peak,
or
null if this pool is no longer valid.
getUsage
public MemoryUsage getUsage()
Returns memory usage statistics for the current memory usage
of the pool. The return value may be null if
this pool is no longer valid. Obtaining these values is
expected to be a relatively quick operation; if this will
instead be an expensive operation to perform, the documentation
of the implementating bean should specify that this is the
case. The values are intended to be an estimate for monitoring
purposes.
- getUsage in interface MemoryPoolMXBean
- the memory usage of the memory pool at present,
or
null if this pool is no longer valid.
isValid
public boolean isValid()
Returns true if this memory pool is still valid. A memory pool
becomes invalid when it is removed by the virtual machine and
no longer used.
- isValid in interface MemoryPoolMXBean
- true if this memory pool is valid.
MemoryPoolMXBeanImpl.java - Implementation of a memory pool bean
Copyright (C) 2006 Free Software Foundation
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