Package org.axonframework.messaging.queryhandling

@NullMarked package org.axonframework.messaging.queryhandling

Package for query handling components in Axon Framework. Queries describe a request for information or state.

Related Packages

Package	Description
org.axonframework.messaging.queryhandling.annotation	Part of the Axon Messaging module.
org.axonframework.messaging.queryhandling.configuration	Part of the Axon Messaging module.
org.axonframework.messaging.queryhandling.distributed	Part of the Axon Messaging module.
org.axonframework.messaging.queryhandling.gateway	Part of the Axon Messaging module.
org.axonframework.messaging.queryhandling.interception	Part of the Axon Messaging module.
org.axonframework.messaging.queryhandling.tracing	Part of the Axon Messaging module.

Class	Description
CompletedEmitterException	Exception indicating that QueryUpdateEmitter is completed, thus cannot be used to emit messages and report errors.
DuplicateQueryHandlerSubscriptionException	Exception indicating a duplicate QueryHandler was subscribed.
GenericQueryMessage	Generic implementation of the QueryMessage interface.
GenericQueryResponseMessage	Generic implementation of the QueryResponseMessage interface.
GenericSubscriptionQueryUpdateMessage	Generic implementation of the SubscriptionQueryUpdateMessage interface holding incremental update of a subscription query.
NoHandlerForQueryException	Exception indicating this instance has no QueryHandler for a given QueryMessage.
QueryBus	The mechanism that dispatches queries to their appropriate query handler.
QueryExecutionException	Exception indicating that the execution of a Query Handler has resulted in an exception.
QueryHandler	Interface describing a handler of queries.
QueryHandlerRegistry<S extends QueryHandlerRegistry<S>>	Interface describing a registry of query handlers.
QueryHandlingComponent	Interface describing a group of QueryHandlers belonging to a single component.
QueryMessage	A Message type that carries a Query: a request for information.
QueryPriorityCalculator	Calculate the priority of QueryMessage based on its content.
QueryResponseMessage	A ResultMessage implementation that contains the result of query handling.
QueryUpdateEmitter	Query-specific component that interacts with subscription queries about update, errors, and when there are no more update.
QueryUpdateEmitterParameterResolverFactory	ParameterResolverFactory that ensures the QueryUpdateEmitter is resolved in the context of the current ProcessingContext.
SimpleQueryBus	Implementation of the QueryBus that dispatches queries (through SimpleQueryBus.query(QueryMessage, ProcessingContext) or SimpleQueryBus.subscriptionQuery(QueryMessage, ProcessingContext, int)) to the QueryHandlers subscribed to that specific query's name and response type combination.
SimpleQueryHandlingComponent	A simple implementation of the QueryHandlingComponent interface, allowing for easy registration of QueryHandlers and other QueryHandlingComponents.
SimpleQueryUpdateEmitter	Simple implementation of the QueryUpdateEmitter, delegating operations to a QueryBus for emitting update, completing subscription queries, and completing subscription queries exceptionally.
SinkWrapper<T>	Abstraction interface to bridge old FluxSink and Sinks.Many API with a common API.
SubscriptionQueryAlreadyRegisteredException	Exception thrown whenever QueryBus.subscriptionQuery(SubscriptionQueryMessage, ProcessingContext, int) is invoked multiple times for the same invalid reference SubscriptionQueryMessage .
SubscriptionQueryUpdateMessage	A ResultMessage implementation that holds incremental update of a subscription query.