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.
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.
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.
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.
SimpleQueryBus	Implementation of the QueryBus that dispatches queries to the handlers within the JVM.
SubscriptionQueryBackpressure	Backpressure mechanism used for subscription queries.

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.