java.lang.management

Interface BufferPoolMXBean

Contents
  • All Superinterfaces:
    PlatformManagedObject

    public interface BufferPoolMXBean
extends 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

    • 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

Document created the 11/06/2005, last modified the 04/03/2020
Source of the printed document:https://www.gaudry.be/en/java-api-rf-java/lang/management/bufferpoolmxbean.html

The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.

References

  1. View the html document Language of the document:fr Manuel PHP : https://docs.oracle.com

These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.

Contents Haut