er.profiling.classloader

Class WeavingClassLoader

java.lang.Object

java.lang.ClassLoader

java.security.SecureClassLoader

java.net.URLClassLoader

er.profiling.classloader.WeavingClassLoader

All Implemented Interfaces:

Closeable, AutoCloseable

public class WeavingClassLoader
extends URLClassLoader

The WeavingClassLoader is a custom URLClassLoader that implements the same functionality as the -javaagent transformation feature, passing all classes through the ClassTransformer prior to definition. When this classloader is enabled as a "root loader" and not a conventional hierarchical classloader it is important to use caution as it may not work as expected in some cases.

Author:

q

Field Summary

Fields

Modifier and Type	Field and Description
static String	GLUE_NAME_KEY
static String	ROOT_LOADER_KEY

Constructor Summary

Constructors

Constructor and Description
WeavingClassLoader(URL[] urls, ClassLoader parent)

Method Summary

Modifier and Type	Method and Description
protected Class<?>	findClass(String name)
protected boolean	isNonTransformable(String className) Determines if a class can be transformed based on the name.
protected boolean	isRootLoader()
protected Class<?>	loadClass(String name, boolean resolve)

Methods inherited from class java.net.URLClassLoader

addURL, close, definePackage, findResource, findResources, getPermissions, getResourceAsStream, getURLs, newInstance, newInstance

Methods inherited from class java.security.SecureClassLoader

defineClass, defineClass

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findLibrary, findLoadedClass, findSystemClass, getClassLoadingLock, getPackage, getPackages, getParent, getResource, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, loadClass, registerAsParallelCapable, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods inherited from class java.lang.Object

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

Field Detail

ROOT_LOADER_KEY

public static final String ROOT_LOADER_KEY

See Also:

Constant Field Values

GLUE_NAME_KEY

public static final String GLUE_NAME_KEY

See Also:

Constant Field Values

Constructor Detail

WeavingClassLoader

public WeavingClassLoader(URL[] urls,
                          ClassLoader parent)

Method Detail

loadClass

protected Class<?> loadClass(String name,
                             boolean resolve)
                      throws ClassNotFoundException

Overrides:

loadClass in class ClassLoader

Throws:

ClassNotFoundException

findClass

protected Class<?> findClass(String name)
                      throws ClassNotFoundException

Overrides:

findClass in class URLClassLoader

Throws:

ClassNotFoundException

isNonTransformable

protected boolean isNonTransformable(String className)

Determines if a class can be transformed based on the name. In most cases as class is non transformable because it is part of the JRE and loaded by bootstrap classloader.

Parameters:

className -

Returns:

whether the class is transformable.

isRootLoader

protected boolean isRootLoader()