EP0553560A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Communications system
Assignee: GPT Ltd
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Filing: 1992-12-18
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Granted: —
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Expires: 2012-12-18
Abstract
Abstract The use of the client-server approach to the problem of multiple users of objects in Object-Oriented Systems is well known. An alternative approach is disclosed where a shared object is created which is copied to all system nodes requiring access to the object and a used-by table created identifying the nodes holding a copy of the object. When the object is updated by operations at one of the nodes then the copies identified by the used-by table are also updated.
Inventors
- 👤 Steve John Atkins
- 👤 Jeffrey Norman Froggatt
- 👤 Leonard William Parker
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 19:42
CPC Classifications
G; G06; G06F; G06F9/00; G06F9/06; G06F9/46; G06F9/465
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
123 words
A method of operating a communications system in which when an object including data is located at a first system node and the object is required for use at a second system node, a copy of the object is provided to the second node and a record is created in a table identifying the object and the associated second node and wherein the object also is required at a further system node or further system nodes, the further node or nodes also are identified in the table, characterised in that when data included within the object is updated by operations at one of the nodes, the copies held at all other nodes are updated in response to the records held within the table.
Claim 2
Dependent Claim
24 words
A method as claimed in Claim 1, characterised in that the object is identified by a copy of the object held within the table.
Claim 3
Dependent Claim
19 words
A method as claimed in Claim 1 or 2, characterised in that the record is held in shared memory.
Claim 4
Dependent Claim
105 words
Means for operating a communications system, the system comprising a plurality of system nodes and objects including data held at at least some of the nodes, characterised by comprising storage means for recording when a copy of an object held at one of the nodes is provided for at least a further one of the plurality of nodes and the node or nodes for which the copy is provided, and means whereby, when a copy of the object is updated by operations at one of the nodes the copies held at all other nodes being updated in response to the record in the storage means.
Claim 5
Dependent Claim
21 words
Means as claimed in Claim 4, characterised in that the storage means includes means for storing a copy of the object.
Claim 6
Dependent Claim
17 words
Means as claimed in Claim 4 or 5, characterised in that the storage means comprises shared memory.
References Cited (Backward Citations)
No citation records indexed.
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