双工服务的实例、会话和并发 [英] Instance, Session and Concurrency for duplex service
问题描述
我有一个要求，即服务应该每秒向客户端发送一条消息.服务只能有一个客户端.
I have a requirement where a service should be sending a message to client every second. There can be only one client to the service.
我创建了一个双工服务，现在对服务的实例、并发和会话感到困惑.
I have a created a duplex service and now confused on instance, concurrency and session for the service.
双工服务是否总是需要会话?SessionMode.Required
Is session always required for a duplex service? SessionMode.Required
InstanceContextMode 是否应该始终为 PerSession.InstanceContextMode = InstanceContextMode.PerSession?
Does the InstanceContextMode should always be PerSession. InstanceContextMode = InstanceContextMode.PerSession?
ConcurrencyMode 应该是什么?
What should be the ConcurrencyMode?
如何防止额外的客户端连接到服务.客户端中的回调引用是否应该是静态的，并在最初收到客户端请求时检查空引用.
How can I prevent additional client connection to the service. Should the callback reference in teh client be static and check for null reference when client request is initially received.
我将实施心跳操作来检查服务的可用性.这应该是单向调用还是请求回复调用，并且这个调用会在同一个会话中吗?
I’ll be implementing a heartbeat operation to check the availablity of the service. Should this be a one-way or request reply call and would this call be in same session?
谢谢.
推荐答案
可能是我迟到了几个月...如果你只有一个客户端并且以后不会有更多客户端，你可以使用最简单的设置: InstanceContextMode.Singleton, SessionMode.NotAllowed.
May be I'm late for a few month... If you have only one client and will not have more clients in future, you can use simplest settings: InstanceContextMode.Singleton, SessionMode.NotAllowed.
关于 ConcurrencyMode，您可以在本教程中阅读:http://codeidol.com/csharp/wcf/Concurrency-Management/Service-Concurrency-Mode/
About ConcurrencyMode you can read in this tutorial: http://codeidol.com/csharp/wcf/Concurrency-Management/Service-Concurrency-Mode/
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