com.atlassian.crowd.event
Class EventStoreGeneric

java.lang.Object
  com.atlassian.crowd.event.EventStoreGeneric

All Implemented Interfaces:

EventStore

public final class EventStoreGeneric
extends Object
implements EventStore

Thread-safe EventStore implementation that uses main memory as a backing store. The amount of events stored is fixed, and after reaching the limit, the oldest events will start to get dropped.

Constructor Summary

EventStoreGeneric(long maxStoredEvents)
Creates a new EventStoreGeneric instance.

Method Summary

String	getCurrentEventToken() Returns a token that can be used for querying events that have happened after the token was generated.
Events	getNewEvents(String eventToken) Returns an events object which contains a new eventToken and events that happened after the given eventToken was generated.
void	invalidateEvents() Removes all events from the EventStore.
void	storeEvent(OperationEvent event) Stores the given event.

Methods inherited from class java.lang.Object

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

Constructor Detail

EventStoreGeneric

public EventStoreGeneric(long maxStoredEvents)

Creates a new EventStoreGeneric instance.

Parameters:

maxStoredEvents - maximum amount of events to keep in the memory

Method Detail

getCurrentEventToken

public String getCurrentEventToken()

Description copied from interface: EventStore

Returns a token that can be used for querying events that have happened after the token was generated.

If the event token has not changed since the last call to this method, it is guaranteed that no new events have been received.

The format of event token is implementation specific and can change without a warning.

Specified by:

getCurrentEventToken in interface EventStore

Returns:

token that can be used for querying events that have happened after the token was generated.

getNewEvents

public Events getNewEvents(String eventToken)
                    throws EventTokenExpiredException

Description copied from interface: EventStore

Returns an events object which contains a new eventToken and events that happened after the given eventToken was generated.

If for any reason event store is unable to retrieve events that happened after the event token was generated, an EventTokenExpiredException will be thrown. The caller is then expected to call EventStore.getCurrentEventToken() again before asking for new events.

Specified by:

getNewEvents in interface EventStore

Parameters:

eventToken - event token that was retrieved by a call to EventStore.getCurrentEventToken() or EventStore.getNewEvents(String)

Returns:

events object which contains a new eventToken and events that happened after the given eventToken was generated.

Throws:

EventTokenExpiredException - if events that happened after the event token was generated can not be retrieved

storeEvent

public void storeEvent(OperationEvent event)

Description copied from interface: EventStore

Stores the given event. Implementations are free to limit the amount of events stored.

Specified by:

storeEvent in interface EventStore

Parameters:

event - event to be stored

invalidateEvents

public void invalidateEvents()

Description copied from interface: EventStore

Removes all events from the EventStore.

Specified by:

invalidateEvents in interface EventStore