Class MetadataParameterResolver

java.lang.Object

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

io.fluxzero.sdk.tracking.handling.MetadataParameterResolver

All Implemented Interfaces:

ParameterResolver<Object>

public class MetadataParameterResolver
extends TypedParameterResolver<Object>

Resolves handler method parameters of type Metadata.

This resolver can inject metadata into handler methods in two ways:

• If the message being handled implements HasMetadata, its metadata is directly returned.
• Otherwise, the metadata is extracted from the current DeserializingMessage (if available).

Example handler:

@HandleCommand
public void handle(MyCommand command, Metadata metadata) {
    String user = metadata.get("userId");
}

Constructor Summary

Constructors

Constructor	Description
MetadataParameterResolver()

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 TypedParameterResolver

matches, mayApply

Methods inherited from class Object

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

Methods inherited from interface ParameterResolver

determinesSpecificity, test

Constructor Details

MetadataParameterResolver

public MetadataParameterResolver()

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(Parameter, 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(Parameter, Annotation, M) is not implemented.