com.triactive.jdo.util
Class ProxyFactory

java.lang.Object
  com.triactive.jdo.util.ProxyFactory

public class ProxyFactory

extends java.lang.Object

A high-performance factory for dynamic proxy objects.

A ProxyFactory performs the same function as java.lang.reflect.Proxy.newProxyInstance(), but does so for a single set of interfaces. It holds a (soft) reference to the proxy class constructor and so can create many proxies of the same type with very little overhead.

The generated proxy class is assigned the same class loader as the ProxyFactory class itself.

Author:

Mike Martin

Constructor Summary

ProxyFactory(java.lang.Class intfc)
Creates a factory for proxy objects that implement the specified interface.

ProxyFactory(java.lang.Class[] interfaces)
Creates a factory for proxy objects that implement the specified interface(s).

Method Summary

java.lang.Object

newInstance(java.lang.reflect.InvocationHandler handler) Returns an instance of a proxy class for this factory's interfaces that dispatches method invocations to the specified invocation handler.

Methods inherited from class java.lang.Object

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

Constructor Detail

ProxyFactory

public ProxyFactory(java.lang.Class intfc)

Creates a factory for proxy objects that implement the specified interface.

Parameters:

intfc - the interface for the proxy class to implement

ProxyFactory

public ProxyFactory(java.lang.Class[] interfaces)

Creates a factory for proxy objects that implement the specified interface(s).

Parameters:

interfaces - the list of interfaces for the proxy class to implement

Method Detail

newInstance

public java.lang.Object newInstance(java.lang.reflect.InvocationHandler handler)

Returns an instance of a proxy class for this factory's interfaces that dispatches method invocations to the specified invocation handler. ProxyFactory.newInstance throws IllegalArgumentException for the same reasons that Proxy.getProxyClass does.

Parameters:

handler - the invocation handler to dispatch method invocations to

Returns:

a proxy instance with the specified invocation handler of a proxy class that implements this factory's specified interfaces

Throws:

java.lang.IllegalArgumentException - if any of the restrictions on the parameters that may be passed to getProxyClass are violated

java.lang.NullPointerException - if the invocation handler is null