com.screenscraper.profiling

Class JavaAgent

java.lang.Object

com.screenscraper.profiling.JavaAgent

public class JavaAgent
extends java.lang.Object

This class is run when the VM is initialized, and gets the instrumentation required to get object memory use and other details User: Mike Date: 1/5/12 Time: 4:47 PM

Method Summary

Modifier and Type	Method and Description
static long	getDeepObjectSize(java.lang.Object object) The size of the object, without any filtering, including all the children objects
static java.lang.instrument.Instrumentation	getInstrumentation() Returns the instrumentation given by the JVM.
static long	getObjectSize(java.lang.Object object) Returns the shallow size of the object, including only the size of the object on the heap, not any of the objects it references
static void	premain(java.lang.String args, java.lang.instrument.Instrumentation instrumentation) Method run before the main method and before any other classes are loaded

Methods inherited from class java.lang.Object

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

Method Detail

premain

public static void premain(java.lang.String args,
                           @NotNull
                           java.lang.instrument.Instrumentation instrumentation)

Method run before the main method and before any other classes are loaded

Parameters:

args - The full command line, including program name. No parsing is done

instrumentation - The java instrumentation given by the JVM

getInstrumentation

public static java.lang.instrument.Instrumentation getInstrumentation()

Returns the instrumentation given by the JVM. Use with care...

Returns:

The instrumentation from the JVM

getObjectSize

public static long getObjectSize(@NotNull
                                 java.lang.Object object)

Returns the shallow size of the object, including only the size of the object on the heap, not any of the objects it references

Parameters:

object - The object to get the size of

Returns:

The shallow size of the object

getDeepObjectSize

public static long getDeepObjectSize(@NotNull
                                     java.lang.Object object)

The size of the object, without any filtering, including all the children objects

Parameters:

object - The object to get the size of

Returns:

The total number of bytes used by the object