Module jdk.management

Package com.ibm.lang.management

Class MemoryUsage

java.lang.Object

com.ibm.lang.management.MemoryUsage

public class MemoryUsage
extends Object

This represents a snapshot of the Operating System level Memory usage statistics. This is available on AIX, Linux, Windows and z/OS.

Since:

1.7.1

Constructor Summary

Constructors

Constructor	Description
MemoryUsage()	Creates a new MemoryUsage instance.

Method Summary

Modifier and Type	Method	Description
static MemoryUsage	from(CompositeData cd)	Receives a CompositeData representing a MemoryUsage
long	getBuffered()	The amount of buffered memory in bytes.
long	getCached()	The amount of cached memory in bytes.
long	getFree()	The total amount of free physical memory in bytes.
long	getSwapFree()	The amount of free swap space in bytes.
long	getSwapTotal()	The amount of total swap space in bytes.
long	getTimestamp()	The timestamp when the usage statistics were last sampled in microseconds.
long	getTotal()	The total amount of usable physical memory in bytes.
String	toString()	Text description of this MemoryUsage object.

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

MemoryUsage

public MemoryUsage()

Creates a new MemoryUsage instance.

Method Detail

getTotal

public long getTotal()

The total amount of usable physical memory in bytes.

Returns:

Total physical memory in bytes or -1 if info not available.

getFree

public long getFree()

The total amount of free physical memory in bytes.

Returns:

Free physical memory in bytes or -1 if info not available.

getSwapTotal

public long getSwapTotal()

The amount of total swap space in bytes.

Returns:

Total swap space in bytes or -1 if info not available.

getSwapFree

public long getSwapFree()

The amount of free swap space in bytes.

Returns:

Free swap space in bytes or -1 if info not available.

getCached

public long getCached()

The amount of cached memory in bytes. Cached memory usually consists of contents of files and block devices.

Returns:

Cached memory in bytes or -1 if info not available.

getBuffered

public long getBuffered()

The amount of buffered memory in bytes. Buffered memory usually consists of file metadata.

• Buffered memory is not available on AIX and Windows.

Returns:

Buffered memory in bytes or -1 if info not available.

getTimestamp

public long getTimestamp()

The timestamp when the usage statistics were last sampled in microseconds.

Returns:

Timestamp in microseconds.

from

public static MemoryUsage from(CompositeData cd)

Receives a CompositeData representing a MemoryUsage

Parameters:

cd - A CompositeData that represents a MemoryUsage

Returns:

If cd is non- null, returns a new instance of MemoryUsage, If cd is null, returns null.

Throws:

IllegalArgumentException - if argument cd does not correspond to a MemoryUsage with the following attributes:

• total(java.lang.Long)
• free(java.lang.Long)
• swapTotal(java.lang.Long)
• swapFree(java.lang.Long)
• cached(java.lang.Long)
• buffered(java.lang.Long)
• timestamp(java.lang.Long)

toString

public String toString()

Text description of this MemoryUsage object.

Overrides:

toString in class Object

Returns:

a text description of this MemoryUsage object.