System for generating unsolicited messages on high-tier communic

Details System for generating unsolicited messages on high-tier communic System for generating unsolicited messages on high-tier communic

1987-10-23

1990-11-20

Shaw, Gareth D.

Boots, shoes, and leggings

364920, 364921, 364974, 3649621, 364940, 3649401, 364138, 364141, G06F 1300, G06F 1200

Patent

active

049723677

ABSTRACT:
In a method for monitoring and collecting data in a multi-tier computer system, a database operation message, referred to as an "open" message is transmitted to a database cache computer with a list of data items in the database cache computer to be monitored on a change-of-state basis. The database cache computer responds by monitoring the data items and returning unsolicited "change data" messages containing only states for data items which have changed over the monitoring period. The change data messages are sent back periodically without the need for polling by a higher-level computer. The monitoring process is terminated by closing data records in the higher-level computer which generates a "close" message to the database computer to terminate the transmission of the change data messages. Also disclosed is a database cache computer and a user interface computer for carrying out the method.

REFERENCES:
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patent: 4831582 (1989-05-01), Miller et al.
Chapter 2, "Communication Concepts", from Allen-Bradley User's Manual 1771-6.5.15.
U.S. Patent Application, Serial No. 928,529, filed Nov. 7, 1986, "Database Access Machine for Factory Automation".

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