Class StatefulHandler.StatefulHandlerInvoker

java.lang.Object

io.fluxzero.common.handling.HandlerInvoker.DelegatingHandlerInvoker

io.fluxzero.sdk.tracking.handling.StatefulHandler.StatefulHandlerInvoker

All Implemented Interfaces:

HandlerInvoker

Enclosing class:

StatefulHandler

protected class StatefulHandler.StatefulHandlerInvoker
extends HandlerInvoker.DelegatingHandlerInvoker

Nested Class Summary

Nested classes/interfaces inherited from interface HandlerInvoker

HandlerInvoker.DelegatingHandlerInvoker, HandlerInvoker.SimpleInvoker

Field Summary

Fields inherited from class HandlerInvoker.DelegatingHandlerInvoker

delegate

Constructor Summary

Constructors

Constructor	Description
StatefulHandlerInvoker(HandlerInvoker delegate, Entry<?> currentEntry, DeserializingMessage message)

Method Summary

Modifier and Type	Method	Description
protected Object	computeId(Object handler)
protected void	handleResult(Object result)	Applies stateful persistence semantics to a handler invocation result.
Object	invoke(BiFunction<Object,Object,Object> combiner)	Invokes the handler and combines results using the given combiner function.
protected Object	tryStoreResult(Object result)	Stores a result object if it is assignable to the stateful handler type.

Methods inherited from class HandlerInvoker.DelegatingHandlerInvoker

expectResult, getMethod, getMethodAnnotation, getTargetClass, isPassive, toString

Methods inherited from class Object

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

Methods inherited from interface HandlerInvoker

andFinally, invoke

Constructor Details

StatefulHandlerInvoker

public StatefulHandlerInvoker(HandlerInvoker delegate,
 Entry<?> currentEntry,
 DeserializingMessage message)

Method Details

invoke

public Object invoke(BiFunction<Object,Object,Object> combiner)

Description copied from interface: HandlerInvoker

Invokes the handler and combines results using the given combiner function. Used when aggregating results from multiple invokers (e.g. HandlerInvoker.join(List)).

Parameters:

combiner - function to combine multiple results

Returns:

the combined result

handleResult

protected void handleResult(Object result)

Applies stateful persistence semantics to a handler invocation result.

Supported result forms:

• Collection<?>: stores every same-type instance in the collection. If the collection is empty, the current entry is deleted. If the current entry ID is not part of returned IDs, the current entry is deleted.
• null: deletes the current entry only when the invoked method is expected to return handler state (same/assignable handler type).
• Single object: stores it only if it is assignable to the handler type. If the stored ID differs from the current ID, the current entry is deleted (replacement behavior).

tryStoreResult

protected Object tryStoreResult(Object result)

Stores a result object if it is assignable to the stateful handler type.

Parameters:

result - object returned from a handler method

Returns:

the computed/stored handler ID, or null if the result is not a stateful handler instance

computeId

protected Object computeId(Object handler)