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java.lang.Object org.springframework.instrument.classloading.ReflectiveLoadTimeWeaver
public class ReflectiveLoadTimeWeaver
LoadTimeWeaver which uses reflection to delegate to an underlying ClassLoader
with well-known transformation hooks. The underlying ClassLoader is expected to
support the following weaving methods (as defined in the LoadTimeWeaver
interface):
public void addTransformer(java.lang.instrument.ClassFileTransformer)
:
for registering the given ClassFileTransformer on this ClassLoader
public ClassLoader getThrowawayClassLoader()
:
for obtaining a throwaway class loader for this ClassLoader (optional;
ReflectiveLoadTimeWeaver will fall back to a SimpleThrowawayClassLoader if
that method isn't available)
Please note that the above methods must reside in a class that is publicly accessible, although the class itself does not have to be visible to the application's class loader.
The reflective nature of this LoadTimeWeaver is particularly useful when the underlying class loader implementation is loaded in a different class loader (such as the application server's class loader which is not visible to the web application). There is no direct API dependency between this LoadTimeWeaver adapter and the underlying ClassLoader, just a 'loose' method contract.
This is the LoadTimeWeaver to use in combination with Spring's
TomcatInstrumentableClassLoader
.
addTransformer(java.lang.instrument.ClassFileTransformer)
,
getThrowawayClassLoader()
,
SimpleThrowawayClassLoader
,
TomcatInstrumentableClassLoader
Constructor Summary | |
---|---|
ReflectiveLoadTimeWeaver()
Create a new ReflectiveLoadTimeWeaver for the current context class loader, which needs to support the required weaving methods. |
|
ReflectiveLoadTimeWeaver(ClassLoader classLoader)
Create a new SimpleLoadTimeWeaver for the given class loader. |
Method Summary | |
---|---|
void |
addTransformer(ClassFileTransformer transformer)
Add a class file transformer to be applied by this load-time weaver. |
ClassLoader |
getInstrumentableClassLoader()
Return a class loader that supports instrumentation through AspectJ-style load-time weaving based on user-defined ClassFileTransformers . |
ClassLoader |
getThrowawayClassLoader()
Return a throwaway class loader, enabling classes to be loaded and inspected without affecting the parent class loader. |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public ReflectiveLoadTimeWeaver()
public ReflectiveLoadTimeWeaver(ClassLoader classLoader)
classLoader
- the ClassLoader
to delegate to for
weaving (must support the required weaving methods).
IllegalArgumentException
- if the supplied ClassLoader
is null
IllegalStateException
- if the supplied ClassLoader
does not support the required weaving methodsMethod Detail |
---|
public void addTransformer(ClassFileTransformer transformer)
LoadTimeWeaver
addTransformer
in interface LoadTimeWeaver
transformer
- the class file transformer to addpublic ClassLoader getInstrumentableClassLoader()
LoadTimeWeaver
ClassFileTransformers
.
May be the current class loader, or a class loader created by this
LoadTimeWeaver
instance.
getInstrumentableClassLoader
in interface LoadTimeWeaver
ClassFileTransformers
public ClassLoader getThrowawayClassLoader()
LoadTimeWeaver
Should not return the same instance of the ClassLoader
returned from an invocation of LoadTimeWeaver.getInstrumentableClassLoader()
.
getThrowawayClassLoader
in interface LoadTimeWeaver
|
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