US 8,150,988 B2Granted

Real-time publish-subscribe system

AssigneeReal-Time Innovations, Inc.

InventorsGerardo Pardo-Castellote, Mark Hamilton, Stefaan Sonck Thiebaut

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Abstract

A real-time protocol for real-time network programming applications is disclosed. The protocol is executable on a computer network having a plurality of nodes that include applications, a network stack, an operating system, and middleware capable of executing real-time operations. The protocol can use group objects to model physical and logical devices connected to the network wherein each group object comprises at least one variable. Changes in these variables are encapsulated in variable change messages which are propagated in the network using communication objects. Also described is a real-time messaging format useful for implementing the protocol.

Claims15

Dependent claims

A real-time protocol executable on a computer network having a plurality of nodes, wherein the nodes include real-time middleware capable of executing real-time operations, the middleware of each node further including:

a write object associated with a variable;
a read object associated with a variable;
a message interpreter that receives and interprets the variable change messages so that they can be read by a read object;
a variable reference table which a write object uses to track variable information;
a remote reader reference table for each reader that has registered to receive information from the writer so that the writer can determine a message status for each reader registered to receive information from the writer, wherein
a variable is a data object that includes a plurality of parameters and a plurality of associated parameter values,
a variable includes parameters for a globally unique identifier and, implicitly or explicitly, a type and a topic;
and
the write object is capable of writing variable change messages having a topic to associated read objects that are registered to receive variable change messages having the topic, without the read communication objects otherwise requesting the change information.

6 more elements

A real-time publish-subscribe (RTPS) message format for use on a real-time computer network where the RTPS messages are sent between communication objects, wherein the communication objects include write communication objects and read communication objects the communication objects are associated with variables, a variable is a data object that includes a plurality of parameters and a plurality of associated parameter values, and a variable includes parameters for a globally unique identifier and, implicitly or explicitly, a type and a topic;

wherein the read communication objects are configured to register with the write communication objects to receive information concerning topics for which those write communication objects have variable information;
and
each write communication object is configured, in response to change information regarding the variable information for a topic, to cause the change information regarding the variable information for that topic to be provided to those read communication objects registered to receive information for that topic without the read communication objects otherwise requesting the change information,
each RTPS message comprising:
a modular message format having a RTPS message header of a uniform length;
a variable number of RTPS submessages where each RTPS submessage includes
a RTPS submessage header of uniform length;
and
a RTPS submessage payload comprised of a variable number of RTPS submessage elements.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/965,589Filed 10 Dec 2010 · continuation
Priority: 5 Apr 2001
Published: US 2011/0185074 A128 Jul 2011
Granted: 3 Apr 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H04L 67/12
Protocols: specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in…
G05B 2219/33149
Director till display: publisher subscriber, publisher, leader broadcasts data to followers, subscriber
H04L 69/329
Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions: in the application layer [OSI layer 7]
H04L
Digital communication

Family

Application60/282,321Us provisional application · filed 5 Apr 2001
Application10/118,470Parent of this continuation · filed 5 Apr 2002
US 7,882,253 B2Parent of this continuation · filed 1 Feb 2011
US 2011/0185074 A1Pre-grant publication · published 28 Jul 2011
US 2002/0178273 A1Published application
US 8,150,988 B2This patent

From the US filing history. Foreign family members aren’t listed.

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