Which instance mode should you use?

You are developing a WCF service.
A new service instance must be created for each client session.
You need to choose an instancing mode.
Which instance mode should you use?

You are developing a WCF service.
A new service instance must be created for each client session.
You need to choose an instancing mode.
Which instance mode should you use?

A.
PerCall

B.
Single

C.
Multiple

D.
PerSession

E.
PerRequest

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Anh Ta

Anh Ta

https://www.codeproject.com/Articles/86007/ways-to-do-WCF-instance-management-Per-call-Per

When should you use per call, per session, and single mode?
Per call

You want a stateless services.
Your service holds intensive resources like connection objects and huge memory objects.
Scalability is a prime requirement. You would like to have a scaled out architecture.
Your WCF functions are called in a single threaded model.
Per session

You want to maintain states between WCF calls.
You a scaled up architecture.
Light resource references.
Single

You want share global data through your WCF service.
Scalability is not a concern.

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