<announcementEndpoint>
This configuration element defines a standard endpoint with a fixed announcement contract. A service can optionally announce its availability by sending an online and offline announcement message when it is opened or closed respectively. A Windows Communication Foundation (WCF) service specifies the announcement endpoints in the <serviceDiscovery> element and uses the AnnouncementClient to perform the announcements. A client wishing to listen for the announcement from other service is actually acting as a WCF service; thus you have to configure the announcement endpoints for that client in the <services> section.
<configuration>
<system.serviceModel>
<standardEndpoints>
<announcementEndpoint>
Syntax
<system.serviceModel>
<standardEndpoints>
<announcementEndpoint>
<standardEndpoint discoveryVersion="WSDiscovery11/WSDiscoveryApril2005"
maxAnnouncementDelay="Timespan"
name="String" />
</announcementEndpoint>
</standardEndpoints>
</system.serviceModel>
Attributes and Elements
The following sections describe attributes, child elements, and parent elements.
Attributes
| Attribute | Description |
|---|---|
| discoveryVersion | A string that specifies one of the two versions of WS-Discovery protocol. Valid values are WSDiscovery11 and WSDiscoveryApril2005. This value is of type DiscoveryVersion. |
| maxAnnouncementDelay | A Timespan value that specifies the maximum value for the delay the Discovery protocol will wait before sending a Hello message. The messages will wait for a random time value between 0 and the value of this attribute before being sent. This attribute is used to set a small, random delay to prevent network storms when a network goes out and all services come back online at the same time. |
| name | A String that specifies the name of the configuration of the standard endpoint. The name is used in the endpointConfiguration attribute of the service endpoint to link a standard endpoint to its configuration. |
Child Elements
None.
Parent Elements
| Element | Description |
|---|---|
| <standardEndpoints> | A collection of standard endpoints that are pre-defined endpoints with one or more of their properties (address, binding, contract) fixed. |
Example
The following example demonstrates a client listening for announcements messages over http and peernet.
<services>
<service name="ServiceAnnouncementListener">
<endpoint name="httpAnnouncementEndpoint"
kind="announcementEndpoint"
binding="basicHttpBinding"
address="announcements" />
<endpoint name="peerNetAnnouncementEndpoint"
kind="announcementEndpoint"
binding="peerTcpBinding"
address="net.p2p://discoveryMesh/multicast"
bindingConfiguration="discoveryPeerTcpBindingConfig" />
...
</service>
</services>
<standardEndpoints>
<announcementEndpoint>
<standardEndpoint name="httpAnnouncementEndpoint"
version="WSDiscoveryApril2005" />
<standardEndpoint name="peerNetAnnouncementEndpoint"
version="WSDiscoveryApril2005" />
</announcementEndpoint>
</standardEndpoints>
