org.tools4j.elara.route

Class DefaultEventRouter

java.lang.Object

org.tools4j.elara.route.DefaultEventRouter

All Implemented Interfaces:

EventRouter, EventRouter.Default

public class DefaultEventRouter
extends Object
implements EventRouter.Default

Nested Class Summary

Nested classes/interfaces inherited from interface org.tools4j.elara.route.EventRouter

EventRouter.Default

Constructor Summary

Constructors

Constructor and Description
DefaultEventRouter(MessageLog.Appender appender, EventApplier eventApplier)

Method Summary

Modifier and Type	Method and Description
void	complete()
boolean	isSkipped() If true the current command was skipped without routing any events.
short	nextEventIndex() Returns the zero based index of the next event to be routed.
org.tools4j.elara.route.DefaultEventRouter.RoutingContext	routingEvent(int type) Starts routing of an event of the given type returns the routing context with the buffer for event encoding.
boolean	skipCommand() Skip the current command if possible.
DefaultEventRouter	start(Command command)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.tools4j.elara.route.EventRouter.Default

routeEvent, routeEvent, routeEventWithoutPayload, routingEvent

Constructor Detail

DefaultEventRouter

public DefaultEventRouter(MessageLog.Appender appender,
                          EventApplier eventApplier)

Method Detail

start

public DefaultEventRouter start(Command command)

routingEvent

public org.tools4j.elara.route.DefaultEventRouter.RoutingContext routingEvent(int type)

Description copied from interface: EventRouter

Starts routing of an event of the given type returns the routing context with the buffer for event encoding. Encoding and routing is completed with route(..) and is recommended to be performed inside a try-resource block; see class documentation for an example.

Specified by:

routingEvent in interface EventRouter

Parameters:

type - the event type, typically non-negative for application events (plugins use negative event types)

Returns:

the context for event encoding and routing

complete

public void complete()

skipCommand

public boolean skipCommand()

Description copied from interface: EventRouter

Skip the current command if possible. Skipping is only possible when no events have been routed yet. Routing events after the command was skipped will result in an exception. Calling skip repeatedly has no further effect and returns the same result as for the first invocation.

Specified by:

skipCommand in interface EventRouter

Returns:

true if the command was skipped, and false if events have been routed already

isSkipped

public boolean isSkipped()

Description copied from interface: EventRouter

If true the current command was skipped without routing any events. Routing events after the command was skipped will result in an exception.

The application state after processing the current command will be exactly the same as before the command. Note that the command will not be be marked as processed and is normally also not replayed. Replaying of the command may occur however if the application is restarted or leadership is passed to another node and commands are replayed from the command log. However replaying occurs only if no subsequent command from the same source has yet been marked as processed.

Specified by:

isSkipped in interface EventRouter

Returns:

true if this command is skipped

nextEventIndex

public short nextEventIndex()

Description copied from interface: EventRouter

Returns the zero based index of the next event to be routed. If routing has started via EventRouter.routingEvent() then the index refers to the event currently being encoded.

Specified by:

nextEventIndex in interface EventRouter

Returns:

index of the next event to be routed.