de.otto.synapse.subscription

Class StateRepositorySnapshotProvider<E>

java.lang.Object

de.otto.synapse.subscription.StateRepositorySnapshotProvider<E>

Type Parameters:

E -

All Implemented Interfaces:

SnapshotProvider

public class StateRepositorySnapshotProvider<E>
extends java.lang.Object
implements SnapshotProvider

A SnapshotProvider that is relying on a StateRepository to generate the snapshot messages for a given entity-id.

Using an EntityToMessageListTransformer, the entities stored in the StateRepository can be transformed into a sequence of messages. This is especially required, if the representation of the entity does not match the payload of the snapshot messages.

Constructor Summary

Constructors

Constructor and Description
StateRepositorySnapshotProvider(java.lang.String channelName, StateRepository<E> stateRepository)
StateRepositorySnapshotProvider(java.lang.String channelName, StateRepository<E> stateRepository, EntityToMessageListTransformer<E> entityToMessagesTransformer)

Method Summary

Modifier and Type	Method and Description
java.lang.String	channelName() The name of the subscribable messaging channel.
java.util.stream.Stream<? extends Message<?>>	snapshot(java.lang.String entityId) Returns a stream containing all Messages required to get the most current snapshot for the entity that is identified by the given entityId

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

StateRepositorySnapshotProvider

public StateRepositorySnapshotProvider(java.lang.String channelName,
                                       StateRepository<E> stateRepository)

StateRepositorySnapshotProvider

public StateRepositorySnapshotProvider(java.lang.String channelName,
                                       StateRepository<E> stateRepository,
                                       EntityToMessageListTransformer<E> entityToMessagesTransformer)

Method Detail

channelName

public java.lang.String channelName()

Description copied from interface: SnapshotProvider

The name of the subscribable messaging channel.

Specified by:

channelName in interface SnapshotProvider

Returns:

channel name

snapshot

public java.util.stream.Stream<? extends Message<?>> snapshot(java.lang.String entityId)

Description copied from interface: SnapshotProvider

Returns a stream containing all Messages required to get the most current snapshot for the entity that is identified by the given entityId

Specified by:

snapshot in interface SnapshotProvider

Parameters:

entityId - the identifier used to select a single entity.

Returns:

Stream of messages