com.thoughtworks.proxy.toys.failover
Class FailoverInvoker<T>

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

All Implemented Interfaces:

Invoker, Serializable

public class FailoverInvoker<T>
extends HotSwappingInvoker<T>

Invoker that implements a failover strategy by using different delegates in case of an exception. The implemented strategy is a simple round-robin algorithm to change the delegate in case of a relevant exception.

Since:

0.1

Author:

Dan North, Aslak Hellesøy, Jörg Schaible

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.thoughtworks.proxy.toys.hotswap.HotSwappingInvoker

HotSwappingInvoker.CycleCheck

Constructor Summary

FailoverInvoker(Class<?>[] types, ProxyFactory proxyFactory, T[] delegates, Class<? extends Throwable> exceptionClass)
Construct a FailoverInvoker.

Method Summary

protected Object

invokeOnDelegate(Method method, Object[] args) Invoke the given method on the delegate.

Methods inherited from class com.thoughtworks.proxy.toys.hotswap.HotSwappingInvoker

delegate, hotswap, invoke, proxy

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

equals, getDelegateReference, getMethodToInvoke, getProxyFactory, hashCode

Methods inherited from class java.lang.Object

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

Constructor Detail

FailoverInvoker

public FailoverInvoker(Class<?>[] types,
                       ProxyFactory proxyFactory,
                       T[] delegates,
                       Class<? extends Throwable> exceptionClass)

Construct a FailoverInvoker.

Parameters:

types - the types of the proxy

proxyFactory - the ProxyFactory to use

delegates - the delegates to use

exceptionClass - the type of the exception

Since:

0.1

Method Detail

invokeOnDelegate

protected Object invokeOnDelegate(Method method,
                                  Object[] args)
                           throws InvocationTargetException

Description copied from class: DelegatingInvoker

Invoke the given method on the delegate.

Overrides:

invokeOnDelegate in class DelegatingInvoker<Object>

Parameters:

method - the method to invoke

args - the arguments for the invocation

Returns:

the method's result

Throws:

InvocationTargetException - if the invoked method throws any exception