You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
94 lines
2.8 KiB
94 lines
2.8 KiB
/*
|
|
* Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
|
|
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*/
|
|
|
|
package java.lang.management;
|
|
|
|
/**
|
|
* The management interface for a buffer pool, for example a pool of
|
|
* {@link java.nio.ByteBuffer#allocateDirect direct} or {@link
|
|
* java.nio.MappedByteBuffer mapped} buffers.
|
|
*
|
|
* <p> A class implementing this interface is an
|
|
* {@link javax.management.MXBean}. A Java
|
|
* virtual machine has one or more implementations of this interface. The {@link
|
|
* java.lang.management.ManagementFactory#getPlatformMXBeans getPlatformMXBeans}
|
|
* method can be used to obtain the list of {@code BufferPoolMXBean} objects
|
|
* representing the management interfaces for pools of buffers as follows:
|
|
* <pre>
|
|
* List<BufferPoolMXBean> pools = ManagementFactory.getPlatformMXBeans(BufferPoolMXBean.class);
|
|
* </pre>
|
|
*
|
|
* <p> The management interfaces are also registered with the platform {@link
|
|
* javax.management.MBeanServer MBeanServer}. The {@link
|
|
* javax.management.ObjectName ObjectName} that uniquely identifies the
|
|
* management interface within the {@code MBeanServer} takes the form:
|
|
* <pre>
|
|
* java.nio:type=BufferPool,name=<i>pool name</i>
|
|
* </pre>
|
|
* where <em>pool name</em> is the {@link #getName name} of the buffer pool.
|
|
*
|
|
* @since 1.7
|
|
*/
|
|
public interface BufferPoolMXBean extends PlatformManagedObject {
|
|
|
|
/**
|
|
* Returns the name representing this buffer pool.
|
|
*
|
|
* @return The name of this buffer pool.
|
|
*/
|
|
String getName();
|
|
|
|
/**
|
|
* Returns an estimate of the number of buffers in the pool.
|
|
*
|
|
* @return An estimate of the number of buffers in this pool
|
|
*/
|
|
long getCount();
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* @return An estimate of the total capacity of the buffers in this pool
|
|
* in bytes
|
|
*/
|
|
long getTotalCapacity();
|
|
|
|
/**
|
|
* 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 {@link #getTotalCapacity capacity} of
|
|
* the buffers in this pool. This difference is explained by alignment,
|
|
* memory allocator, and other implementation specific reasons.
|
|
*
|
|
* @return An estimate of the memory that the Java virtual machine is using
|
|
* for this buffer pool in bytes, or {@code -1L} if an estimate of
|
|
* the memory usage is not available
|
|
*/
|
|
long getMemoryUsed();
|
|
}
|