Package de.quantummaid.eventmaid.qcec.queryresolving

Interface QueryResolver

All Known Implementing Classes:

QueryResolverImpl

public interface QueryResolver

A QueryResolver allows sending Query on an synchronous MessageBus.

See Also:

EventMaid Documentation

Method Summary

Modifier and Type	Method	Description
<T extends Query<?>> SubscriptionId	answer(Class<T> queryClass, Consumer<T> responder)	Adds a new Consumer as Subscriber forthe given Query class.
<R> Optional<R>	query(Query<R> query)	Sends the Query to all interested Subscribers.
<R> R	queryRequired(Query<R> query)	Sends the Query to all interested Subscribers.
void	unsubscribe(SubscriptionId subscriptionId)	Method to remove all Consumer matching the SubscriptionId.

Method Detail

query

<R> Optional<R> query(Query<R> query)

Sends the Query to all interested Subscribers. This method does not need to return an result.

Type Parameters:

R - the type of the result

Parameters:

query - the Query to be sent

Returns:

an Optional for the Query result

queryRequired

<R> R queryRequired(Query<R> query)

Sends the Query to all interested Subscribers. This method expects a valid result.

Type Parameters:

R - the type of the result

Parameters:

query - the Query to be sent

Returns:

the Query result

Throws:

UnsupportedOperationException - if not result was received

answer

<T extends Query<?>> SubscriptionId answer(Class<T> queryClass,
                                           Consumer<T> responder)

Adds a new Consumer as Subscriber forthe given Query class.

Type Parameters:

T - the type of the query

Parameters:

queryClass - the class of the Query

responder - the Consumer to answer the query

Returns:

a SubscriptionId of the Subscriber

unsubscribe

void unsubscribe(SubscriptionId subscriptionId)

Method to remove all Consumer matching the SubscriptionId.

Parameters:

subscriptionId - the SubscriptionId to remove