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java.nio
Interface BufferPoolMXBean

All Superinterfaces:

PlatformManagedObject

public interface BufferPoolMXBean
extends PlatformManagedObject

The management interface for a buffer pool.

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

Method Summary

Modifier and Type	Method and Description
long	getCount() Returns an estimate of the number of buffers in the pool.
long	getMemoryUsed() Returns an estimate of the memory that the Java virtual machine is using for this buffer pool.
String	getName() Returns the name representing this buffer pool.
long	getTotalCapacity() Returns an estimate of the total capacity of the buffers in this pool.

Methods inherited from interface java.lang.management.PlatformManagedObject

getObjectName

Method Detail

getName

String getName()

Returns the name representing this buffer pool.

Returns:

The name of this buffer pool.

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

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

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 total capacity of 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 -1L if an estimate of the memory usage is not available