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Data server with data probes employing predicate tests in rule statements

  • US 5,615,359 A
  • Filed: 06/23/1994
  • Issued: 03/25/1997
  • Est. Priority Date: 06/23/1994
  • Status: Expired due to Fees
First Claim
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1. A method of operating a data base, comprising the steps of:

  • applying a rule statement, including a predicate test for specified data, to a data server from a user application;

    storing the rule statement by rule name in a rule table in the data server;

    applying an inquiry statement, referencing the rule statement by rule name, to the data server from the user application;

    invoking an Event level data probe from the data server, in response to the data specified by the rule statement, to collect data from an appropriate data source and to emit the collected data to the data server;

    testing the collected data emitted by the Event level data probe at the data server in accordance with the predicate test;

    determining the occurrence of an event represented by the predicate test; and

    invoking an Advisor level probe from the data server to return data passing the predicate test to the user application in response to the inquiry statement if and only if the event was determined to have occurred.

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