| US 7,551,622 B2 | ||
| Quality of service enforcement | ||
| Erol Bozak, Pforzheim (Germany); and Alexander Gebhart, Bad Schoenborn (Germany) | ||
| Assigned to SAP AG, Walldorf (Germany) | ||
| Filed on Dec. 13, 2004, as Appl. No. 11/10,802. | ||
| Prior Publication US 2006/0126639 A1, Jun. 15, 2006 | ||
| Int. Cl. H04L 12/28 (2006.01); H04L 12/56 (2006.01); H04J 3/16 (2006.01); H04J 3/22 (2006.01) | ||
| U.S. Cl. 370—395.21 [370/468] | 21 Claims |
| 1. A method for use in a network of interconnected computer systems, comprising:
generating a Quality of Service (QoS) requirements document between a client and a first server having a resource for execution
of a service in the first server;
initiating execution of the service in the first server in response to a client request;
calculating, using the first server, an actual QoS level based on execution of the client-requested service in the first server;
implementing a QoS requirement service in the first server to monitor execution of the client-requested service, the QoS requirement
service comparing the actual QoS level with a requirement specified in the QoS requirements document and requesting the first
server to search for an additional resource within the first server when the first server cannot guarantee the requirement
specified in the QoS requirements document;
migrating execution of the client-requested service from the first server to a service in a second server if the first server
cannot locate the additional resource or cannot guarantee the requirement specified in the QoS requirements document by using
the additional resource, the migration being performed by creating a first connection between the first server and the second
server and sending the client request from the first server to the second server over the first connection via a message;
executing the client-requested service in the second server by using the service in the second server, while maintaining the
first connection; and
monitoring execution of the client-requested service in the second server by using the QoS requirement service of the first
server, wherein the QoS requirement service migrates execution of the client-requested service from the second server to a
third server when the second server cannot guarantee the requirement specified in the QoS reqirements document, the migration
being performed by breaking the first connection and creating a second connection between the first server and the third server
to send the client request to the third server over the second connection.
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