Concurrency Control

Concurrency control defines a controlled way of allowing multiple users to simultaneously access the same resource in the repository. Accessing a resource includes displaying, changing and deleting it.

The DTR allows multiple users to access the same resource at the same point in time. The constraints defined by the DTR for concurrent access of the resources in a repository are captured below:

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       1.      If one user has checked out a resource for deletion in a workspace, then no other user can check out the same resource for modification or for deletion in the same workspace.

       2.      If one user has checked out a resource for modification in a workspace, then no other user can check out the same resource for deletion in the same workspace. But any other user can check out the resource for modification.

The DTR perspective also offers an exclusive check-out function, which prevents other users from checking out the same resource in parallel.