de.uni_hildesheim.sse.monitoring.runtime.recording

Class ObjectSizeProvider

java.lang.Object

de.uni_hildesheim.sse.monitoring.runtime.recording.ObjectSizeProvider

All Implemented Interfaces:

IObjectSizeProvider

public class ObjectSizeProvider
extends java.lang.Object
implements IObjectSizeProvider

Allows to access the size of an object as allocated by the JVM. This class was introduced to allow native access in case that no agent is running (static instrumentation).

Since:

1.00

Version:

1.00

Author:

Holger Eichelberger

Field Summary

Fields

Modifier and Type	Field and Description
private static IObjectSizeProvider	instance Stores the singleton instance.

Constructor Summary

Constructors

Constructor and Description
ObjectSizeProvider()

Method Summary

Modifier and Type	Method and Description
private static IObjectSizeProvider	createDefaultProvider() Creates the default provider.
static IObjectSizeProvider	getInstance() Returns the singleton instance allowing access to object sizes.
long	getObjectSize(java.lang.Object object) Returns the size of the given object as allocated by the JVM.
static void	setInstance(IObjectSizeProvider newInstance) Changes the singleton instance (may be done by the instrumentation Agent).

Methods inherited from class java.lang.Object

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

Field Detail

instance

private static IObjectSizeProvider instance

Stores the singleton instance.

Constructor Detail

ObjectSizeProvider

public ObjectSizeProvider()

Method Detail

createDefaultProvider

private static IObjectSizeProvider createDefaultProvider()

Creates the default provider. Do not delete or rename this method. It might be overridden by instrumentation in case of static instrumentation.

Returns:

the default provider

Since:

1.00

setInstance

public static final void setInstance(IObjectSizeProvider newInstance)

Changes the singleton instance (may be done by the instrumentation Agent).

Parameters:

newInstance - the new singleton instance (must not be null).

Throws:

java.lang.IllegalArgumentException - in case that newInstance==null

Since:

1.00

getInstance

public static final IObjectSizeProvider getInstance()

Returns the singleton instance allowing access to object sizes.

Returns:

the singleton instance

Since:

1.00

getObjectSize

public long getObjectSize(java.lang.Object object)

Returns the size of the given object as allocated by the JVM. This method is a dummy implementation.

Specified by:

getObjectSize in interface IObjectSizeProvider

Parameters:

object - the object the size should be queried for

Returns:

the size of the physical memory allocated for object (in bytes, negative or zero if invalid or not available, always 0)

Since:

1.00