Resource Manager Framework for Controlling QoS
One of the purposes of servers is to provide handle (connection) for the resources they have, on demand. However, rarely do servers associate client-priority or impose a limit on numbers while allocating handles to a client. Instead, the handles are allotted on a first-come-first-serve basis.

The aim of this framework is to provide a control mechanism while granting handles to requesting clients. It limits the number of handles that could be obtained by a client with specific priority, decided a priori by the administrator. A client is prioritized by either its fixed attributes (name, type, organization, etc.) and/or by its run time context, containing application-specific information (value of shopping cart, etc.).

The 'Bucket Concept' is used to allot handles of resources to the requesting client. Accordingly, if the bucket is full, clients with all priorities are entertained. As the level of available handles goes down in the bucket, only high-priority clients are entertained. Resource Manager also ensures that when a client gets a handle, it can hold it only for the specified time. It can also get the handle back if no activity from the client is observed for a specified duration of time. A Database Connection Manager has been implemented using this framework as a proof-of-concept.