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Service Instance and InstanceContextMode attribute


InstanceContextMode can be set to PerCall, Single or PerSession.

InstanceContextMode.PerCall
Description
New service instance for each call.
To enable set
InstanceContextMode.PerCall
Service Instance created when
The instance is created when a request is received from the client
Service Instance disposed when
Disposed after servicing a single call.
Benefits
Scalable, Service instance disposed after each call.
Issues
Stateless, lowers performance, Clients not aware of multiple instances created during session.


InstanceContextMode.Single
Description
Single instance is used to serve all calls.
To enable set
InstanceContextMode.Single
Service Instance created when
The instance is created when the service host is created
Service Instance disposed when
Disposed when service host is closed.
Benefits
Easy to manage global state,
Issues
Less Scalable, need additional coding to manage concurrency and session state.



InstanceContextMode.PerSession (default)
Description
A new service instance is created for each client channel. A unique session ID is used when servicing request from a single client channel.
To enable set
InstanceContextMode.PerSession
Service Instance created when
The instance is created when a request is received from a client
Service Instance disposed when
Disposed when the session ends.
Benefits
Easy to manage state for each client.
Issues
Less scalable, client is tightly coupled to a service instance






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