Package org.springframework.cloud.client.discovery.event

Class HeartbeatEvent

java.lang.Object

java.util.EventObject

org.springframework.context.ApplicationEvent

org.springframework.cloud.client.discovery.event.HeartbeatEvent

All Implemented Interfaces:

Serializable

public class HeartbeatEvent
extends org.springframework.context.ApplicationEvent

An event that a DiscoveryClient implementation can broadcast if it supports heartbeats from the discovery server. Provides listeners with a basic indication of a state change in the service catalog.

Author:

Spencer Gibb, Dave Syer

See Also:

Serialized Form

Field Summary

Fields inherited from class java.util.EventObject

source

Constructor Summary

Constructors

Constructor	Description
HeartbeatEvent(Object source, Object state)	Creates a new event with a source (for example, a discovery client) and a value.

Method Summary

Modifier and Type	Method	Description
Object	getValue()	A value representing the state of the service catalog.

Methods inherited from class org.springframework.context.ApplicationEvent

getTimestamp

Methods inherited from class java.util.EventObject

getSource, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

HeartbeatEvent

public HeartbeatEvent(Object source,
                      Object state)

Creates a new event with a source (for example, a discovery client) and a value. Neither parameter should be relied on to have specific content or format.

Parameters:

source - The source of the event.

state - The value indicating state of the catalog.

Method Detail

getValue

public Object getValue()

A value representing the state of the service catalog. The only requirement is that it changes when the catalog is updated; it can be as simple as a version counter or a hash. Implementations can provide information to help users visualize what is going on in the catalog, but users should not rely on the content (since the implementation of the underlying discovery might change).

Returns:

A value representing state of the service catalog.