Package com.caplin.datasource

Interface StatusEvent

All Known Subinterfaces:

SubjectStatusEvent

public interface StatusEvent

Represents an event that is raised when there is a change in the status of the backend.

Usage in DataSource source applications

A StatusEvent can be raised by a source application (that is, a DataSource application sending data to its DataSource peers). A DataProvider in the application creates the SubjectStatusEvent to indicate to peers the status of their subscription to all subjects. For example, if the back end system that feeds data to a DataProvider goes down, the DataProvider should raise a StatusEvent with a with a SubjectStatus of SubjectStatus.Stale to indicate to the peer that the data it has is not completely up-to-date. When an update is subsequently received from the backend data feed, then the DataProvider should raise a SubjectStatusEvent with a SubjectStatus of SubjectStatus.Ok to indicate to the peer that the data it has is now up to date.

Usage in DataSource sink applications

A SubjectStatusEvent can be received by a sink application (that is, a DataSource application receiving data from its DataSource peers). Such events are received through the SubscriptionListener.subjectStatusReceived(com.caplin.datasource.subscription.Subscription, Peer, SubjectStatusEvent) callback on SubscriptionListener.

You do not have to implement this interface yourself. Instances can be created by calling the MessageFactory.createSubjectStatusEvent(String, SubjectStatus, String) method on the MessageFactory that is available on the Publisher interface.

Method Summary

Modifier and Type	Method	Description
String	getMessage()	Gets the subject status message.
SubjectStatus	getStatus()	Gets the status of the subject.

Method Details

getStatus

SubjectStatus getStatus()

Gets the status of the subject.

Returns:

The status.

getMessage

String getMessage()

Gets the subject status message.

Returns:

A string representing the subject status.