Model and system state synchronization

• US 20060034263A1
• Filed: 09/08/2005
• Published: 02/16/2006
• Est. Priority Date: 03/06/2003
• Status: Active Grant

• Current Assignee: ServiceNow Incorporated
• Original Assignee: Microsoft Corporation
• Inventors: Mensching, Rob, Outhred, Geoffrey, Brown, Mathilde C., Grealish, Kevin D.J., Gustin, Reid B., Han, Eric K., Nielsen, Steven T.
• Granted Patent: US 7,684,964 B2
• Time in Patent Office: Days
• US Class Current: 370/352
• CPC Class Codes: G06F 9/4492 Inheritance
• CPC Class Codes: G06F 9/465 Distributed object oriented systems remote method invocation [RMI] G06F9/548

Abstract

Embodiments of model and system state synchronization are presented herein.

Claims

1. A method comprising:

receiving an input which describes a revision to at least one of a plurality of instances in a model of a distributed system, wherein;

the plurality of instances form an instance space which describes a configuration of the model of the distributed system; and

the revision pertains to a change in configuration to the at least one said instance; and

synchronizing the model with the distributed system such that the revision, when applied to the model, is propagated to the distributed system.

2. A method as described in claim 1, wherein the distributed system includes one or more applications being executed by a plurality of computing devices.

3. A method as described in claim 1, wherein one or more said instances are described as a series of revisions in the model.

4. A method as described in claim 1, wherein the revision describes a state transition of the at least one said instance.

5. A method as described in claim 1, wherein the revision is defined with respect to a previous revision of the at least one said instance.

6. A method as described in claim 1, wherein during the synchronizing, the revision is placed in an in progress state that locks the at least one said instance from modification by another revision.

7. A method as described in claim 1, wherein:

the revision is included as a part of a change that includes a plurality of revisions to the model; and

the synchronizing fails for each said revision when the synchronizing of any one said revisions fails.

8. A method as described in claim 1, wherein:

the revision is in a planned state before the synchronizing is performed;

the revision is in a current state after the synchronizing is performed; and

another revision which is previous to the revision is in a current state before the synchronizing is performed is in a history state after the synchronizing is performed.

9. A method as described in claim 1, wherein:

the revision is defined with respect to a previous revision of the at least one said instance;

the previous revision is set in a current state and the revision is set in a planned state before the synchronizing;

during the synchronizing, the revision is placed in an in progress state that locks the at least one said instance from modification by another revision; and

after the synchronizing, the previous revision is set in a history state and the revision is set in a current state.

10. A method comprising:

applying a change to a model of a distributed system, wherein;

the change describes a plurality of revisions to a plurality of instances in the model;

the plurality of instances form an instance space which describes a configuration of the model of the distributed system; and

each said revision pertains to a change in configuration of a respective said instance; and

executing code of the model to apply the change to the distributed system.

11. A method as described in claim 10, wherein the change is successfully applied to the model when each said revision is successfully applied to the respective said instance.

12. A method as described in claim 10, wherein at least one said instance is described through a series of revisions having a historical state, a current state and a planned state, respectively.

13. A method as described in claim 10, wherein at least one of the plurality of revisions is defined in relation to a previous revision of a respective said instance.

14. A method as described in claim 10, wherein when the applying of the change fails, each of the plurality of instances are reverted to a respective previous revision.

15. One or more computer readable media comprising computer executable instructions that, when executed, direct a computer to maintain a model of hardware and software resources of a distributed system, wherein:

the model is defined through use of a plurality of instances, one or more of which are described through a series of revisions which describe a historical, current and planned state of a respective said instance; and

the state of the revisions in the model affects configuration of the distributed system.

16. One or more computer readable media as described in claim 15, wherein each said instance describes property values and identifies members and relationships in which the instance participates.

17. One or more computer readable media as described in claim 15, wherein:

the current revision is defined with respect to the historical revision; and

the planned revision is defined with respect to the current revision.

18. One or more computer readable media as described in claim 15, wherein the computer executable instructions maintain the model by propagating state changes of the revisions to the distributed system such that configuration changes made to the model are synchronized with the distributed system.

19. One or more computer readable media as described in claim 15, wherein the computer executable instructions maintain the model by discovering configuration changes made to the distributed system and applying the discovered changes to the model.

20. One or more computer readable media as described in claim 15, wherein each said revision describes a change in property values, members of a respective said instance and a relationship, in which, the respective said instance participates.