com.thoughtworks.proxy.toys.failover

Class FailoverInvoker<T>

java.lang.Object

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

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

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

All Implemented Interfaces:

Invoker, java.io.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

See Also:

Serialized Form

Nested Class Summary

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

HotSwappingInvoker.CycleCheck

Field Summary

Fields

Modifier and Type	Field and Description
private int	current
private T[]	delegates
private java.lang.Class<? extends java.lang.Throwable>	exceptionClass
private static long	serialVersionUID

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
protected java.lang.Object	invokeOnDelegate(java.lang.reflect.Method method, java.lang.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

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

delegates

private T[] delegates

exceptionClass

private java.lang.Class<? extends java.lang.Throwable> exceptionClass

current

private int current

Constructor Detail

FailoverInvoker

public FailoverInvoker(java.lang.Class<?>[] types,
                       ProxyFactory proxyFactory,
                       T[] delegates,
                       java.lang.Class<? extends java.lang.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 java.lang.Object invokeOnDelegate(java.lang.reflect.Method method,
                                            java.lang.Object[] args)
                                     throws java.lang.reflect.InvocationTargetException

Description copied from class: DelegatingInvoker

Invoke the given method on the delegate.

Overrides:

invokeOnDelegate in class DelegatingInvoker<java.lang.Object>

Parameters:

method - the method to invoke

args - the arguments for the invocation

Returns:

the method's result

Throws:

java.lang.reflect.InvocationTargetException - if the invoked method throws any exception