Package org.projectnessie.events.service

Class EventService

java.lang.Object

org.projectnessie.events.service.EventService

All Implemented Interfaces:

AutoCloseable

public class EventService
extends Object
implements AutoCloseable

Base class for event services.

This class takes care of starting and stopping the subscribers, and provides helper methods for handling incoming results from the version store, and for firing events.

This class is meant to be used as a singleton. It provides all the required functionality to process and deliver events. Subclasses may override some of the protected methods to add support for tracing, or to implement more sophisticated delivery logic.

Field Summary

Fields

Modifier and Type	Field	Description
protected final EventConfig	config
static final String	EVENT_ID_MDC_KEY
protected final EventFactory	factory
protected final EventSubscribers	subscribers
static final String	SUBSCRIPTION_ID_MDC_KEY

Constructor Summary

Constructors

Constructor	Description
EventService(EventConfig config, EventFactory factory, EventSubscribers subscribers)

Method Summary

Modifier and Type	Method	Description
void	close()	Closes the event service by deactivating the subscribers.
protected void	deliverEvent(org.projectnessie.events.api.Event event, org.projectnessie.events.spi.EventSubscriber subscriber, org.projectnessie.events.spi.EventSubscription subscription)
protected void	fireEvent(org.projectnessie.events.api.Event event)	Forwards the event to all subscribers.
void	onVersionStoreEvent(VersionStoreEvent event)	Invoked when a result is received from the version store by ResultCollector, then forwarded to this service for delivery.
void	start()	Starts event delivery by activating the subscribers.

Methods inherited from class java.lang.Object

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

Field Details

SUBSCRIPTION_ID_MDC_KEY

public static final String SUBSCRIPTION_ID_MDC_KEY

See Also:

• Constant Field Values

EVENT_ID_MDC_KEY

public static final String EVENT_ID_MDC_KEY

See Also:

• Constant Field Values

config

protected final EventConfig config

factory

protected final EventFactory factory

subscribers

protected final EventSubscribers subscribers

Constructor Details

EventService

public EventService(EventConfig config,
 EventFactory factory,
 EventSubscribers subscribers)

Method Details

start

public void start()

Starts event delivery by activating the subscribers.

close

public void close()

Closes the event service by deactivating the subscribers.

Specified by:

close in interface AutoCloseable

onVersionStoreEvent

public void onVersionStoreEvent(VersionStoreEvent event)

Invoked when a result is received from the version store by ResultCollector, then forwarded to this service for delivery.

See Also:

• ResultCollector.accept(Result)
• ResultCollector.shouldProcess(Result)

fireEvent

protected void fireEvent(org.projectnessie.events.api.Event event)

Forwards the event to all subscribers.

deliverEvent

protected void deliverEvent(org.projectnessie.events.api.Event event,
 org.projectnessie.events.spi.EventSubscriber subscriber,
 org.projectnessie.events.spi.EventSubscription subscription)