org.axonframework.queryhandling

Interface QueryGateway

All Superinterfaces:

MessageDispatchInterceptorSupport<QueryMessage<?,?>>

All Known Implementing Classes:

DefaultQueryGateway

public interface QueryGateway
extends MessageDispatchInterceptorSupport<QueryMessage<?,?>>

Interface towards the Query Handling components of an application. This interface provides a friendlier API toward the query bus.

Since:

3.1

Author:

Marc Gathier, Allard Buijze, Steven van Beelen, Milan Savic

Method Summary

Modifier and Type	Method and Description
default <R,Q> CompletableFuture<R>	query(Q query, Class<R> responseType) Sends given query over the QueryBus, expecting a response with the given responseType from a single source.
default <R,Q> CompletableFuture<R>	query(Q query, ResponseType<R> responseType) Sends given query over the QueryBus, expecting a response in the form of responseType from a single source.
default <R,Q> CompletableFuture<R>	query(String queryName, Q query, Class<R> responseType) Sends given query over the QueryBus, expecting a response with the given responseType from a single source.
<R,Q> CompletableFuture<R>	query(String queryName, Q query, ResponseType<R> responseType) Sends given query over the QueryBus, expecting a response in the form of responseType from a single source.
default <R,Q> Stream<R>	scatterGather(Q query, ResponseType<R> responseType, long timeout, TimeUnit timeUnit) Sends given query over the QueryBus, expecting a response in the form of responseType from several sources.
<R,Q> Stream<R>	scatterGather(String queryName, Q query, ResponseType<R> responseType, long timeout, TimeUnit timeUnit) Sends given query over the QueryBus, expecting a response in the form of responseType from several sources.
default <Q,I,U> SubscriptionQueryResult<I,U>	subscriptionQuery(Q query, Class<I> initialResponseType, Class<U> updateResponseType) Sends given query over the QueryBus and returns result containing initial response and incremental updates (received at the moment the query is sent, until it is cancelled by the caller or closed by the emitting side).
default <Q,I,U> SubscriptionQueryResult<I,U>	subscriptionQuery(Q query, ResponseType<I> initialResponseType, ResponseType<U> updateResponseType) Sends given query over the QueryBus and returns result containing initial response and incremental updates (received at the moment the query is sent, until it is cancelled by the caller or closed by the emitting side).
default <Q,I,U> SubscriptionQueryResult<I,U>	subscriptionQuery(String queryName, Q query, Class<I> initialResponseType, Class<U> updateResponseType) Sends given query over the QueryBus and returns result containing initial response and incremental updates (received at the moment the query is sent, until it is cancelled by the caller or closed by the emitting side).
default <Q,I,U> SubscriptionQueryResult<I,U>	subscriptionQuery(String queryName, Q query, ResponseType<I> initialResponseType, ResponseType<U> updateResponseType, SubscriptionQueryBackpressure backpressure) Sends given query over the QueryBus and returns result containing initial response and incremental updates (received at the moment the query is sent, until it is cancelled by the caller or closed by the emitting side).
<Q,I,U> SubscriptionQueryResult<I,U>	subscriptionQuery(String queryName, Q query, ResponseType<I> initialResponseType, ResponseType<U> updateResponseType, SubscriptionQueryBackpressure backpressure, int updateBufferSize) Sends given query over the QueryBus and returns result containing initial response and incremental updates (received at the moment the query is sent, until it is cancelled by the caller or closed by the emitting side).

Methods inherited from interface org.axonframework.messaging.MessageDispatchInterceptorSupport

registerDispatchInterceptor

Method Detail

query

default <R,Q> CompletableFuture<R> query(Q query,
                                         Class<R> responseType)

Sends given query over the QueryBus, expecting a response with the given responseType from a single source. The query name will be derived from the provided query. Execution may be asynchronous, depending on the QueryBus implementation.

Type Parameters:

R - The response class contained in the given responseType

Q - The query class

Parameters:

query - The query to be sent

responseType - A Class describing the desired response type

Returns:

A CompletableFuture containing the query result as dictated by the given responseType

query

default <R,Q> CompletableFuture<R> query(String queryName,
                                         Q query,
                                         Class<R> responseType)

Sends given query over the QueryBus, expecting a response with the given responseType from a single source. Execution may be asynchronous, depending on the QueryBus implementation.

Type Parameters:

R - The response class contained in the given responseType

Q - The query class

Parameters:

queryName - A String describing the query to be executed

query - The query to be sent

responseType - The ResponseType used for this query

Returns:

A CompletableFuture containing the query result as dictated by the given responseType

query

default <R,Q> CompletableFuture<R> query(Q query,
                                         ResponseType<R> responseType)

Sends given query over the QueryBus, expecting a response in the form of responseType from a single source. The query name will be derived from the provided query. Execution may be asynchronous, depending on the QueryBus implementation.

Type Parameters:

R - The response class contained in the given responseType

Q - The query class

Parameters:

query - The query to be sent

responseType - The ResponseType used for this query

Returns:

A CompletableFuture containing the query result as dictated by the given responseType

query

<R,Q> CompletableFuture<R> query(String queryName,
                                 Q query,
                                 ResponseType<R> responseType)

Sends given query over the QueryBus, expecting a response in the form of responseType from a single source. Execution may be asynchronous, depending on the QueryBus implementation.

Type Parameters:

R - The response class contained in the given responseType

Q - The query class

Parameters:

queryName - A String describing the query to be executed

query - The query to be sent

responseType - The ResponseType used for this query

Returns:

A CompletableFuture containing the query result as dictated by the given responseType

scatterGather

default <R,Q> Stream<R> scatterGather(Q query,
                                      ResponseType<R> responseType,
                                      long timeout,
                                      TimeUnit timeUnit)

Sends given query over the QueryBus, expecting a response in the form of responseType from several sources. The stream is completed when a timeout occurs or when all results are received. The query name will be derived from the provided query. Execution may be asynchronous, depending on the QueryBus implementation.

Type Parameters:

R - The response class contained in the given responseType

Q - The query class

Parameters:

query - The query to be sent

responseType - The ResponseType used for this query

timeout - A timeout of long for the query

timeUnit - The selected TimeUnit for the given timeout

Returns:

A stream of results.

scatterGather

<R,Q> Stream<R> scatterGather(String queryName,
                              Q query,
                              ResponseType<R> responseType,
                              long timeout,
                              TimeUnit timeUnit)

Sends given query over the QueryBus, expecting a response in the form of responseType from several sources. The stream is completed when a timeout occurs or when all results are received. Execution may be asynchronous, depending on the QueryBus implementation.

Type Parameters:

R - The response class contained in the given responseType

Q - The query class

Parameters:

queryName - A String describing the query to be executed

query - The query to be sent

responseType - The ResponseType used for this query

timeout - A timeout of long for the query

timeUnit - The selected TimeUnit for the given timeout

Returns:

A stream of results.

subscriptionQuery

default <Q,I,U> SubscriptionQueryResult<I,U> subscriptionQuery(Q query,
                                                               Class<I> initialResponseType,
                                                               Class<U> updateResponseType)

Sends given query over the QueryBus and returns result containing initial response and incremental updates (received at the moment the query is sent, until it is cancelled by the caller or closed by the emitting side).

Note: Any null results, on the initial result or the updates, wil lbe filtered out by the QueryGateway. If you require the null to be returned for the initial and update results, we suggest using the QueryBus instead.

Type Parameters:

Q - The type of the query

I - The type of the initial response

U - The type of the incremental update

Parameters:

query - The query to be sent

initialResponseType - The initial response type used for this query

updateResponseType - The update response type used for this query

Returns:

registration which can be used to cancel receiving updates

See Also:

QueryBus.subscriptionQuery(SubscriptionQueryMessage), QueryBus.subscriptionQuery(SubscriptionQueryMessage, SubscriptionQueryBackpressure, int)

subscriptionQuery

default <Q,I,U> SubscriptionQueryResult<I,U> subscriptionQuery(String queryName,
                                                               Q query,
                                                               Class<I> initialResponseType,
                                                               Class<U> updateResponseType)

Sends given query over the QueryBus and returns result containing initial response and incremental updates (received at the moment the query is sent, until it is cancelled by the caller or closed by the emitting side).

Note: Any null results, on the initial result or the updates, wil lbe filtered out by the QueryGateway. If you require the null to be returned for the initial and update results, we suggest using the QueryBus instead.

Type Parameters:

Q - The type of the query

I - The type of the initial response

U - The type of the incremental update

Parameters:

queryName - A String describing query to be executed

query - The query to be sent

initialResponseType - The initial response type used for this query

updateResponseType - The update response type used for this query

Returns:

registration which can be used to cancel receiving updates

See Also:

QueryBus.subscriptionQuery(SubscriptionQueryMessage), QueryBus.subscriptionQuery(SubscriptionQueryMessage, SubscriptionQueryBackpressure, int)

subscriptionQuery

default <Q,I,U> SubscriptionQueryResult<I,U> subscriptionQuery(Q query,
                                                               ResponseType<I> initialResponseType,
                                                               ResponseType<U> updateResponseType)

Sends given query over the QueryBus and returns result containing initial response and incremental updates (received at the moment the query is sent, until it is cancelled by the caller or closed by the emitting side).

Note: Any null results, on the initial result or the updates, wil lbe filtered out by the QueryGateway. If you require the null to be returned for the initial and update results, we suggest using the QueryBus instead.

Type Parameters:

Q - The type of the query

I - The type of the initial response

U - The type of the incremental update

Parameters:

query - The query to be sent

initialResponseType - The initial response type used for this query

updateResponseType - The update response type used for this query

Returns:

registration which can be used to cancel receiving updates

See Also:

QueryBus.subscriptionQuery(SubscriptionQueryMessage), QueryBus.subscriptionQuery(SubscriptionQueryMessage, SubscriptionQueryBackpressure, int)

subscriptionQuery

default <Q,I,U> SubscriptionQueryResult<I,U> subscriptionQuery(String queryName,
                                                               Q query,
                                                               ResponseType<I> initialResponseType,
                                                               ResponseType<U> updateResponseType,
                                                               SubscriptionQueryBackpressure backpressure)

Sends given query over the QueryBus and returns result containing initial response and incremental updates (received at the moment the query is sent, until it is cancelled by the caller or closed by the emitting side).

Note: Any null results, on the initial result or the updates, wil lbe filtered out by the QueryGateway. If you require the null to be returned for the initial and update results, we suggest using the QueryBus instead.

Type Parameters:

Q - The type of the query

I - The type of the initial response

U - The type of the incremental update

Parameters:

queryName - A String describing query to be executed

query - The query to be sent

initialResponseType - The initial response type used for this query

updateResponseType - The update response type used for this query

backpressure - The backpressure mechanism to deal with producing of incremental updates

Returns:

registration which can be used to cancel receiving updates

See Also:

QueryBus.subscriptionQuery(SubscriptionQueryMessage), QueryBus.subscriptionQuery(SubscriptionQueryMessage, SubscriptionQueryBackpressure, int)

subscriptionQuery

<Q,I,U> SubscriptionQueryResult<I,U> subscriptionQuery(String queryName,
                                                       Q query,
                                                       ResponseType<I> initialResponseType,
                                                       ResponseType<U> updateResponseType,
                                                       SubscriptionQueryBackpressure backpressure,
                                                       int updateBufferSize)

Sends given query over the QueryBus and returns result containing initial response and incremental updates (received at the moment the query is sent, until it is cancelled by the caller or closed by the emitting side).

Note: Any null results, on the initial result or the updates, wil lbe filtered out by the QueryGateway. If you require the null to be returned for the initial and update results, we suggest using the QueryBus instead.

Type Parameters:

Q - The type of the query

I - The type of the initial response

U - The type of the incremental update

Parameters:

queryName - A String describing query to be executed

query - The query to be sent

initialResponseType - The initial response type used for this query

updateResponseType - The update response type used for this query

backpressure - The backpressure mechanism to deal with producing of incremental updates

updateBufferSize - The size of buffer which accumulates updates before subscription to the flux is made

Returns:

registration which can be used to cancel receiving updates

See Also:

QueryBus.subscriptionQuery(SubscriptionQueryMessage), QueryBus.subscriptionQuery(SubscriptionQueryMessage, SubscriptionQueryBackpressure, int)