org.axonframework.eventhandling
Interface EventSequencingPolicy

All Known Implementing Classes:

FullConcurrencyPolicy, SequentialPerAggregatePolicy, SequentialPolicy

public interface EventSequencingPolicy

Interface to a policy definition for concurrent event handling.

Some implementations are provided by default:

• SequentialPolicy: Default policy. Requires that all events are handled in the order they arrive at the event handler. This also means that at most 1 thread is processing events for this handler at any time.
• FullConcurrencyPolicy: Allows each event to be handled independently of any other events. Event processing will typically start in the same order the events were dispatched in.
• SequentialPerAggregatePolicy: Will force events generated by the same aggregate to be handled sequentially. At most one thread will be processing events of a single aggregate at any time

Since:

0.3

Author:

Allard Buijze

Method Summary

Object

getSequenceIdentifierFor(Event event) Returns the sequence identifier for the given event.

Method Detail

getSequenceIdentifierFor

Object getSequenceIdentifierFor(Event event)

Returns the sequence identifier for the given event. When two events have the same identifier (as defined by their equals method), they will be executed sequentially. A null value indicates that there are no sequencing requirements for the handling of this event.

Parameters:

event - the event for which to get the sequencing identifier

Returns:

a sequence identifier for the given event