- All Superinterfaces:
PlatformManagedObject
The management interface for a buffer pool, for example a pool of
direct or mapped buffers.
A class implementing this interface is an
MXBean. A Java
virtual machine has one or more implementations of this interface. The getPlatformMXBeans
method can be used to obtain the list of BufferPoolMXBean objects
representing the management interfaces for pools of buffers as follows:
List<BufferPoolMXBean> pools = ManagementFactory.getPlatformMXBeans(BufferPoolMXBean.class);
The management interfaces are also registered with the platform MBeanServer. The ObjectName that uniquely identifies the
management interface within the MBeanServer takes the form:
java.nio:type=BufferPool,name=pool name
where pool name is the name of the buffer pool.- Since:
- 1.7
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Method Summary
Modifier and TypeMethodDescriptionlonggetCount()Returns an estimate of the number of buffers in the pool.longReturns an estimate of the memory that the Java virtual machine is using for this buffer pool.getName()Returns the name representing this buffer pool.longReturns an estimate of the total capacity of the buffers in this pool.Methods declared in interface java.lang.management.PlatformManagedObject
getObjectName
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Method Details
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getName
String getName()Returns the name representing this buffer pool.- Returns:
- The name of this buffer pool.
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getCount
long getCount()Returns an estimate of the number of buffers in the pool.- Returns:
- An estimate of the number of buffers in this pool
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getTotalCapacity
long getTotalCapacity()Returns an estimate of the total capacity of the buffers in this pool. A buffer's capacity is the number of elements it contains and the value returned by this method is an estimate of the total capacity of buffers in the pool in bytes.- Returns:
- An estimate of the total capacity of the buffers in this pool in bytes
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getMemoryUsed
long getMemoryUsed()Returns an estimate of the memory that the Java virtual machine is using for this buffer pool. The value returned by this method may differ from the estimate of the totalcapacityof the buffers in this pool. This difference is explained by alignment, memory allocator, and other implementation specific reasons.- Returns:
- An estimate of the memory that the Java virtual machine is using
for this buffer pool in bytes, or
-1Lif an estimate of the memory usage is not available
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