org.apache.skywalking.apm.agent.core.plugin.loader

Class InterceptorInstanceLoader

java.lang.Object

org.apache.skywalking.apm.agent.core.plugin.loader.InterceptorInstanceLoader

public class InterceptorInstanceLoader
extends Object

The InterceptorInstanceLoader is a classes finder and container.

This is a very important class in sky-walking's auto-instrumentation mechanism. If you want to fully understand why need this, and how it works, you need have knowledge about Classloader appointment mechanism.

Created by wusheng on 16/8/2.

Constructor Summary

Constructors

Constructor and Description
InterceptorInstanceLoader()

Method Summary

Modifier and Type	Method and Description
static <T> T	load(String className, ClassLoader targetClassLoader) Load an instance of interceptor, and keep it singleton.

Methods inherited from class java.lang.Object

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

Constructor Detail

InterceptorInstanceLoader

public InterceptorInstanceLoader()

Method Detail

load

public static <T> T load(String className,
                         ClassLoader targetClassLoader)
                  throws IllegalAccessException,
                         InstantiationException,
                         ClassNotFoundException,
                         AgentPackageNotFoundException

Load an instance of interceptor, and keep it singleton. Create AgentClassLoader for each targetClassLoader, as an extend classloader. It can load interceptor classes from plugins, activations folders.

Type Parameters:

T - expected type

Parameters:

className - the interceptor class, which is expected to be found

targetClassLoader - the class loader for current application context

Returns:

the type reference.

Throws:

IllegalAccessException

InstantiationException

ClassNotFoundException

AgentPackageNotFoundException