org.hotswap.agent.plugin.jvm

Class AnonymousClassInfos

java.lang.Object

org.hotswap.agent.plugin.jvm.AnonymousClassInfos

public class AnonymousClassInfos
extends Object

Info about anonymous classes.

This class will on construction search for all anonymous classes of the main class and calculate superclass, interfaces, all methods signature and all fields signature. Depending on used constructor this is done via reflection from ClassLoader (current loaded state) or from ClassPool via javaassist. Note that ClassPool uses LoadClassPath on the ClassLoader and hence are resources resolved via the ClassLoader. Javaasist resolves the resource and returns bytcode as is in the resource file.

Use mapPreviousState() to create compatible transition mapping between old state and new state. This mapping is then used by plugin to swap class bytecoded to retain hotswap changes compatible

Author:

Jiri Bubnik

Field Summary

Fields

Modifier and Type	Field and Description
static int	UNIQUE_CLASS_START_INDEX

Constructor Summary

Constructors

Constructor and Description
AnonymousClassInfos(ClassLoader classLoader, String className) Create info of the current state from the classloader via reflection.
AnonymousClassInfos(ClassPool classPool, String className) Create info of the new state from the classPool via javassist.

Method Summary

Modifier and Type	Method and Description
AnonymousClassInfo	getAnonymousClassInfo(String className) Returns stored info of an anonymous class
String	getCompatibleTransition(String className) Find compatible transition class name.
Map<AnonymousClassInfo,AnonymousClassInfo>	getCompatibleTransitions() Returns calculated compatible transitions.
boolean	isCurrent(ClassPool classPool) Return true, if last modification timestamp is same as current timestamp of className.
void	mapPreviousState(AnonymousClassInfos previousAnonymousClassInfos) Set previous class info state and calculate compatible transitions.

Methods inherited from class java.lang.Object

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

Field Detail

UNIQUE_CLASS_START_INDEX

public static final int UNIQUE_CLASS_START_INDEX

See Also:

Constant Field Values

Constructor Detail

AnonymousClassInfos

public AnonymousClassInfos(ClassLoader classLoader,
                           String className)

Create info of the current state from the classloader via reflection.

Parameters:

classLoader - classloader to use

className - main class

AnonymousClassInfos

public AnonymousClassInfos(ClassPool classPool,
                           String className)

Create info of the new state from the classPool via javassist.

Parameters:

classPool - classPool to resolve class files

className - main class

Method Detail

getAnonymousClassInfo

public AnonymousClassInfo getAnonymousClassInfo(String className)

Returns stored info of an anonymous class

Parameters:

className - class name of the anonymous class (Should be in the form of MyClass$3)

Returns:

class info x null

mapPreviousState

public void mapPreviousState(AnonymousClassInfos previousAnonymousClassInfos)

Set previous class info state and calculate compatible transitions. Usually new state is created from classpool, while old state from classloader.

Parameters:

previousAnonymousClassInfos - previous state

isCurrent

public boolean isCurrent(ClassPool classPool)

Return true, if last modification timestamp is same as current timestamp of className.

Parameters:

classPool - classPool to check className file

Returns:

true if is current

getCompatibleTransitions

public Map<AnonymousClassInfo,AnonymousClassInfo> getCompatibleTransitions()

Returns calculated compatible transitions.

Returns:

calculated compatible transitions.

getCompatibleTransition

public String getCompatibleTransition(String className)

Find compatible transition class name.

Parameters:

className - name of existing class (old)

Returns:

name of compatible new class that should replace old class. Can be null if no compatible class found.