Durable Services

Introduction: What is Durable Service? How we create a Durable Service?

Durable services are WCF services that persist service state information even after service host is restarted or Client.
Durable services have the capability to restore their own state when they are recycled.
It can use data store like SQL database for maintain instance state.
It is new feature in .Net 3.5.

Defining the Durable Service:

Durable service can be implemented using [DurableService()] attribute.
It takes 'CanCreateInstance' and 'CompletesInstance' property to mention on which operation instance state has to be saved and destroyed.

CanCreateInstance = true: Calling this operation results in creating the serialization and inserting it into the datastore.
CompletesInstance = true: Calling this operation results in deleting the persisted instance from the datastore.

Code:

[Serializable]
[DurableService()]
public class MyService :IMyservice
{
[DurableOperation(CanCreateInstance = true)]
public int StartPersistance()
{
//Do Something
}
[DurableOperation(CompletesInstance = true)]
public void EndPersistence()
{
//Do Something
}
}