com.thoughtworks.proxy.toys.hotswap
Class HotSwappingInvoker<T>

java.lang.Object
  com.thoughtworks.proxy.toys.delegate.DelegatingInvoker<Object>
      com.thoughtworks.proxy.toys.hotswap.HotSwappingInvoker<T>

All Implemented Interfaces:

Invoker, Serializable

Direct Known Subclasses:

FailoverInvoker

public class HotSwappingInvoker<T>
extends DelegatingInvoker<Object>

A DelegatingInvoker implementation that allows the exchange of the delegate.

Since:

0.1

Author:

Aslak Hellesøy, Dan North, Paul Hammant, Jörg Schaible

See Also:

Serialized Form

Nested Class Summary

protected static interface

HotSwappingInvoker.CycleCheck Internal interface used to detect cyclic swapping activity.

Constructor Summary

HotSwappingInvoker(Class<?>[] types, ProxyFactory proxyFactory, ObjectReference<Object> delegateReference, DelegationMode delegationMode)
Construct a HotSwappingInvoker.

Method Summary

protected Object	delegate() Retrieve the delegated object in derived classes.
protected Object	hotswap(Object newDelegate) Exchange the current delegate.
Object	invoke(Object proxy, Method method, Object[] args) Invocation of a method of the proxied object.
T	proxy() Create a proxy for this Invoker.

Methods inherited from class com.thoughtworks.proxy.toys.delegate.DelegatingInvoker

equals, getDelegateReference, getMethodToInvoke, getProxyFactory, hashCode, invokeOnDelegate

Methods inherited from class java.lang.Object

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

Constructor Detail

HotSwappingInvoker

public HotSwappingInvoker(Class<?>[] types,
                          ProxyFactory proxyFactory,
                          ObjectReference<Object> delegateReference,
                          DelegationMode delegationMode)

Construct a HotSwappingInvoker.

Parameters:

types - the types of the proxy

proxyFactory - the ProxyFactory to use

delegateReference - the ObjectReference with the delegate

delegationMode - DelegationMode.DIRECT or DelegationMode.SIGNATURE

Since:

1.0

Method Detail

invoke

public Object invoke(Object proxy,
                     Method method,
                     Object[] args)
              throws Throwable

Description copied from interface: Invoker

Invocation of a method of the proxied object.

Specified by:

invoke in interface Invoker

Overrides:

invoke in class DelegatingInvoker<Object>

Parameters:

proxy - the proxy instance.

method - the method to invoke.

args - the arguments of the method.

Returns:

the result of the invoked method.

Throws:

Throwable - if the invoked method has thrown.

delegate

protected Object delegate()

Description copied from class: DelegatingInvoker

Retrieve the delegated object in derived classes.

Overrides:

delegate in class DelegatingInvoker<Object>

Returns:

the delegated object

hotswap

protected Object hotswap(Object newDelegate)

Exchange the current delegate.

Parameters:

newDelegate - the new delegate

Returns:

the old delegate

Throws:

IllegalStateException - if cyclic swapping action is detected

Since:

0.1

proxy

public T proxy()

Create a proxy for this Invoker. The proxy implements all the types given as parameter to the constructor and implements additionally the Swappable interface.

Returns:

the new proxy

Since:

0.1