Change notification query multiplexing
First Claim
Patent Images
1. A storage platform comprising:
- a database engine;
a data store implemented on the database engine for storing data therein;
an application programming interface that enables application programs to issue requests for notification of a change to one or more specified elements stored in the data store; and
a data structure comprising a plurality of parameter tables, each one of the plurality of parameter tables configured to respectively store information regarding requests from entities with a same security context, wherein;
requests from at least two entities subject to having the same security context are multiplexed to form a combined query of the database engine;
a first change notification request from a first entity of said at least two entities has a first security context for accessing said data store;
a second change notification request from a second entity of said at least two entities has a second security context for accessing said data store; and
said first change notification request and said second change notification request are directed to a same parameter table of said plurality of parameter tables.
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Abstract
In order to efficiently handle change notification requests to a storage system based on a database data store and a database engine, the change notification requests are multiplexed. This can be done by issuing a query which refers, for information about what changes are being tracked, to a data structure. The information about what changes to track for each request to be multiplexed is stored in the data structure. Additionally, information about the request can be stored in the data structure. By adding information to the data structure, the query can be altered without needing to directly modify or reissue the query.
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Citations
14 Claims
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1. A storage platform comprising:
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a database engine; a data store implemented on the database engine for storing data therein; an application programming interface that enables application programs to issue requests for notification of a change to one or more specified elements stored in the data store; and a data structure comprising a plurality of parameter tables, each one of the plurality of parameter tables configured to respectively store information regarding requests from entities with a same security context, wherein; requests from at least two entities subject to having the same security context are multiplexed to form a combined query of the database engine; a first change notification request from a first entity of said at least two entities has a first security context for accessing said data store; a second change notification request from a second entity of said at least two entities has a second security context for accessing said data store; and said first change notification request and said second change notification request are directed to a same parameter table of said plurality of parameter tables. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A computer-implemented method for handling a first change notification request for notification of a first change to data in a data store and a second change notification request for notification of a second change to data in a data store, comprising:
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receiving via the computer, said first change notification request; determining that said first change notification has a first security context for accessing said data store; storing information regarding the first change notification request as a first parameter entry in a first parameter table of a data structure; submitting a query to said data store, said query calculated to indicate an occurrence of said first change; receiving said second change notification request; determining that said second change notification request has a second security context for accessing said data store; examining said second change notification request for determining;
a) that the request is directed to the first parameter table and b) that the second security context is similar to the first security context; andsubject to said second change notification request a) being directed to the first parameter table and b) having said second security context similar to the first security context; storing information regarding the second change notification request as a second parameter entry in the first parameter table of the data structure; and altering said previously submitted query via access to said data structure without resubmission of said previously submitted query, so that said previously submitted query is thereafter calculated to indicate an occurrence of at least one of said first change or said second change; else, when said second change notification request is a) not directed to the first parameter table or b) has said second security context different than said first security context; storing information regarding the second change notification request as a first parameter entry in a second parameter table of the data structure; and submitting a new query independent of said previously submitted query, the new query calculated to indicate an occurrence of said second change. - View Dependent Claims (10, 11)
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12. A computer-readable storage medium having instructions stored thereon for causing a computer to perform a method of handling a first change notification request for notification of a first change to data in a data store and a second change notification request for notification of a second change to data in a data store, said method comprising:
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receiving said first change notification request; determining that said first change notification has a first security context for accessing said data store; storing information regarding the first change notification request as a first parameter entry in a first parameter table of a data structure; submitting a query to said data store, said query calculated to indicate an occurrence of said first change; receiving said second change notification request; determining that said second change notification has a second security context for accessing said data store; examining said second change notification request for determining;
a) that the request is directed to the first parameter table and b) that the second security context is similar to the first security context; andsubject to said second change notification request a) being directed to the first parameter table and b) having said second security context similar to the first security context; storing information regarding the second change notification request as a second parameter entry in the first parameter table of the data structure; and altering said previously submitted query via access to said data structure without resubmission of said previously submitted query, so that said previously submitted query is thereafter calculated to indicate an occurrence of at least one of said first change or said second change; else, when said second change notification request is a) not directed to the first parameter table or b) has said second security context different than said first security context; storing information regarding the second change notification request as a first parameter entry in a second parameter table of the data structure; and submitting a new query independent of said previously submitted query, the new query calculated to indicate an occurrence of said second change. - View Dependent Claims (13, 14)
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Specification