org.axonframework.saga.annotation
Class SagaMethodMessageHandlerInspector<T extends AbstractAnnotatedSaga>

java.lang.Object
  org.axonframework.saga.annotation.SagaMethodMessageHandlerInspector<T>

Type Parameters:

T - The type of saga targeted by this inspector

public class SagaMethodMessageHandlerInspector<T extends AbstractAnnotatedSaga>
extends Object

Utility class that inspects annotation on a Saga instance and returns the relevant configuration for its Event Handlers.

Since:

0.7

Author:

Allard Buijze

Constructor Summary

protected

SagaMethodMessageHandlerInspector(Class<T> sagaType, ParameterResolverFactory parameterResolverFactory) Initialize the inspector to handle events for the given sagaType.

Method Summary

SagaMethodMessageHandler	findHandlerMethod(AbstractAnnotatedSaga target, EventMessage event) Finds the handler method on given target for the given event.
static <T extends AbstractAnnotatedSaga> SagaMethodMessageHandlerInspector<T>	getInstance(Class<T> sagaType, ParameterResolverFactory parameterResolverFactory) Returns a SagaMethodMessageHandlerInspector for the given sagaType.
List<SagaMethodMessageHandler>	getMessageHandlers(EventMessage event) Find the configuration for the handlers for the given event.
ParameterResolverFactory	getParameterResolverFactory() Returns the ParameterResolverFactory used by this inspector to resolve values for handler parameters
Class<T>	getSagaType() Returns the type of saga this inspector handles.

Methods inherited from class java.lang.Object

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

Constructor Detail

SagaMethodMessageHandlerInspector

protected SagaMethodMessageHandlerInspector(Class<T> sagaType,
                                            ParameterResolverFactory parameterResolverFactory)

Initialize the inspector to handle events for the given sagaType.

Parameters:

sagaType - The type of saga this inspector handles

parameterResolverFactory - The factory for parameter resolvers that resolve parameters for the annotated methods

Method Detail

getInstance

public static <T extends AbstractAnnotatedSaga> SagaMethodMessageHandlerInspector<T> getInstance(Class<T> sagaType,
                                                                                                 ParameterResolverFactory parameterResolverFactory)

Returns a SagaMethodMessageHandlerInspector for the given sagaType. The inspector provides information about @SagaEventHandler annotated handler methods.

Type Parameters:

T - The type of Saga to get the inspector for

Parameters:

sagaType - The type of Saga to get the inspector for

parameterResolverFactory - The factory for parameter resolvers that resolve parameters for the annotated methods

Returns:

The inspector for the given saga type

getMessageHandlers

public List<SagaMethodMessageHandler> getMessageHandlers(EventMessage event)

Find the configuration for the handlers for the given event. If no suitable handler is found, an empty list is returned. The handlers are returned in the order they should be inspected to match against the association value. The first handler in the list to match an association value of the Saga instance should be used to invoke that saga.

Parameters:

event - The Event to investigate the handler for

Returns:

the configuration of the handlers, as defined by the annotations.

findHandlerMethod

public SagaMethodMessageHandler findHandlerMethod(AbstractAnnotatedSaga target,
                                                  EventMessage event)

Finds the handler method on given target for the given event.

Parameters:

target - The instance to find a handler method on

event - The event to find a handler for

Returns:

the most suitable handler for the event on the target, or an instance describing no such handler exists

getSagaType

public Class<T> getSagaType()

Returns the type of saga this inspector handles.

Returns:

the type of saga (Class) this inspector handles

getParameterResolverFactory

public ParameterResolverFactory getParameterResolverFactory()

Returns the ParameterResolverFactory used by this inspector to resolve values for handler parameters

Returns:

the ParameterResolverFactory used by this inspector