Package org.perfectable.introspection.proxy

Class JavassistProxyService

java.lang.Object

org.perfectable.introspection.proxy.JavassistProxyService

All Implemented Interfaces:

ProxyService

@Immutable
@AutoService(ProxyService.class)
public final class JavassistProxyService
extends Object
implements ProxyService

Nested Class Summary

Nested classes/interfaces inherited from interface org.perfectable.introspection.proxy.ProxyService

ProxyService.Container, ProxyService.Feature, ProxyService.UnsupportedFeatureException

Field Summary

Fields inherited from interface org.perfectable.introspection.proxy.ProxyService

INSTANCES

Constructor Summary

Constructors

Constructor	Description
JavassistProxyService()

Method Summary

Modifier and Type	Method	Description
<I> I	instantiate(ClassLoader classLoader, Class<?> baseClass, List<? extends Class<?>> interfaces, InvocationHandler<? super MethodInvocation<I>> handler)	Creates proxy instance.
boolean	supportsFeature(ProxyService.Feature feature)	If the concrete service supports specified feature.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.perfectable.introspection.proxy.ProxyService

supportsAllFeatures

Constructor Detail

JavassistProxyService

public JavassistProxyService()

Method Detail

supportsFeature

public boolean supportsFeature(ProxyService.Feature feature)

Description copied from interface: ProxyService

If the concrete service supports specified feature.

Specified by:

supportsFeature in interface ProxyService

Parameters:

feature - feature to test

Returns:

if service supports feature

instantiate

public <I> I instantiate(ClassLoader classLoader,
                         Class<?> baseClass,
                         List<? extends Class<?>> interfaces,
                         InvocationHandler<? super MethodInvocation<I>> handler)
                  throws ProxyService.UnsupportedFeatureException

Description copied from interface: ProxyService

Creates proxy instance.

This method either creates new proxy class, or reuses one that matches. This proxy class extends baseClass and implements interfaces, and is created in classLoader. After creating this class, its object is instantiated. The object will delegate every call that it receives to specified InvocationHandler. The only exception is Object.finalize(), which must be ignored.

This method assumes that the arguments were correctly prepared:

• baseClass is not final
• baseClass is actually a class (not an interface)
• baseClass and each element of interfaces has classloader exactly classLoader
• Each element in interfaces is an interface (not a class)

Specified by:

instantiate in interface ProxyService

Type Parameters:

I - type of proxy

Parameters:

classLoader - classloader used to create proxy class

baseClass - proxy superclass, cannot be final, must be a class

interfaces - additional interfaces that proxy class should implement

handler - invocation handler to pass method execution for this proxy instance

Returns:

proxy instance

Throws:

ProxyService.UnsupportedFeatureException - when this service cannot create proxy with requested parameters, because it doesn't support some feature required to do so