Package io.fluxcapacitor.javaclient.tracking.handling

Class MessageParameterResolver

java.lang.Object

io.fluxcapacitor.common.handling.TypedParameterResolver<Object>

io.fluxcapacitor.javaclient.tracking.handling.MessageParameterResolver

All Implemented Interfaces:

ParameterResolver<Object>

public class MessageParameterResolver
extends TypedParameterResolver<Object>

Resolves handler method parameters of type Message.

This resolver is useful when a handler method needs access to the raw Message object associated with the invocation context.

Resolution is attempted via the message context itself (if it implements HasMessage), or from the current thread-local DeserializingMessage as a fallback.

Example:

 @HandleCommand
 public void handle(MyCommand command, Message message) {
     Instant timestamp = message.getTimestamp();
 }
 

Constructor Summary

Constructors

Constructor	Description
MessageParameterResolver()

Method Summary

Modifier and Type	Method	Description
Function<Object,Object>	resolve(Parameter p, Annotation methodAnnotation)	Resolves a Parameter of a handler method into a value function based on the given message.

Methods inherited from class io.fluxcapacitor.common.handling.TypedParameterResolver

matches

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.fluxcapacitor.common.handling.ParameterResolver

determinesSpecificity, filterMessage

Constructor Details

MessageParameterResolver

public MessageParameterResolver()

Method Details

resolve

public Function<Object,Object> resolve(Parameter p,
 Annotation methodAnnotation)

Description copied from interface: ParameterResolver

Resolves a Parameter of a handler method into a value function based on the given message.

If the parameter cannot be resolved by this resolver and ParameterResolver.matches(java.lang.reflect.Parameter, java.lang.annotation.Annotation, M) is not implemented, this method must return null.

Parameters:

p - the parameter to resolve

methodAnnotation - the annotation present on the handler method (e.g., @HandleEvent)

Returns:

a function that takes a message and returns a value to be injected into the method parameter, or null if the parameter cannot be resolved and ParameterResolver.matches(java.lang.reflect.Parameter, java.lang.annotation.Annotation, M) is not implemented.