Package org.axonframework.queryhandling

Interface Summary

Interface	Description
QueryBus	The mechanism that dispatches Query objects to their appropriate QueryHandlers.
QueryGateway	Interface towards the Query Handling components of an application.
QueryHandlerAdapter	Describes a class capable of subscribing to the query bus.
QueryInvocationErrorHandler	Interface describing a mechanism for the QueryMessage components to report errors.
QueryMessage<T,R>	Message type that carries a Query: a request for information.
QueryResponseMessage<T>	Message that contains the results of a Query.
QueryUpdateEmitter	Component which informs subscription queries about updates, errors and when there are no more updates.
SinkWrapper<T>	Abstraction interface to bridge old FluxSink and Sinks.Many API with a common API.
StreamingQueryMessage<Q,R>	A special type of QueryMessage used for initiating streaming queries.
SubscriptionQueryMessage<Q,I,U>	Message type that carries a Subscription Query: a request for information.
SubscriptionQueryResult<I,U>	Result of the subscription query.
SubscriptionQueryUpdateMessage<U>	Message which holds incremental update of an subscription query.

Class Summary

Class	Description
DefaultQueryGateway	Implementation of the QueryGateway interface that allows the registration of dispatchInterceptors.
DefaultQueryGateway.Builder	Builder class to instantiate a DefaultQueryGateway.
DefaultSubscriptionQueryResult<I,U>	Default implementation of SubscriptionQueryResult.
GenericQueryMessage<T,R>	Generic implementation of the QueryMessage.
GenericQueryResponseMessage<R>	QueryResponseMessage implementation that takes all properties as constructor parameters.
GenericStreamingQueryMessage<Q,R>	Generic implementation of the StreamingQueryMessage.
GenericSubscriptionQueryMessage<Q,I,U>	Generic implementation of the SubscriptionQueryMessage.
GenericSubscriptionQueryUpdateMessage<U>	Generic SubscriptionQueryUpdateMessage which holds incremental update of an subscription query.
LoggingQueryInvocationErrorHandler	Implementation of the QueryInvocationErrorHandler that logs all errors to a given Logger.
LoggingQueryInvocationErrorHandler.Builder	Builder class to instantiate a LoggingQueryInvocationErrorHandler.
QuerySubscription<R>	Encapsulates the identifying fields of a Query Handler when one is subscribed to the QueryBus.
SimpleQueryBus	Implementation of the QueryBus that dispatches queries to the handlers within the JVM.
SimpleQueryBus.Builder	Builder class to instantiate a SimpleQueryBus.
SimpleQueryUpdateEmitter	Implementation of QueryUpdateEmitter that uses Project Reactor to implement Update Handlers.
SimpleQueryUpdateEmitter.Builder	Builder class to instantiate a SimpleQueryUpdateEmitter.
SubscriptionQueryBackpressure	Deprecated since 3.4.0 Reactor version, Sinks API does not use FluxSink.OverflowStrategy
UpdateHandlerRegistration<U>	Result of registering an Update Handler.

Exception Summary

Exception	Description
CompletedEmitterException	Exception indicating that QueryUpdateEmitter is completed, thus cannot be used to emit messages and report errors.
NoHandlerForQueryException	Exception indicating a query for a single result was executed, but no handlers were found that could provide an answer.
QueryExecutionException	Exception indicating that the execution of a Query Handler has resulted in an exception.

Annotation Types Summary

Annotation Type	Description
QueryHandler	Marker annotation to mark any method on an object as being a QueryHandler.