Method and data structure for exchanging data

• US 7,657,573 B1
• Filed: 03/31/2003
• Issued: 02/02/2010
• Est. Priority Date: 03/31/2003
• Status: Active Grant

• Current Assignee: Schneider Electric Systems USA, Inc. (Schneider Electric SE)
• Original Assignee: Invensys PLC
• Inventors: Hancsarik, Robert M., Humphrey, Douglas E.
• Primary Examiner(s): Sough; Hyung S
• Assistant Examiner(s): Hoang; Phuong N
• Application Number:
  US10/403,687
• Time in Patent Office: 2,500 Days
• Field of Search: 715/523, 715/517, 715/235, 709/232, 709/245, 707 1- 10, 707101-1041, 707/201
• US Class Current: 707/809
• CPC Class Codes: G06F 9/541 via adapters, e.g. between incompatible applications
• CPC Class Codes: G06F 9/544 Buffers; Shared memory; Pipes

Abstract

A method and system for exchanging at least one data value between a first device and at least one second device, including providing at least one data structure at the first device, the data structure including at least one descriptive field and an associated at least one data value field, the at least one data value field including the least one data value, the at least one descriptive field including a usage type field having usage type data to associate the at least one data value field with a data type, transmitting the at least one data structure from the first device to the at least one second device, and, based on at least the usage type data, at the at least one second device, extracting the at least one data value from the at least one data value field.

Claims

1. A method of exchanging at least one data value between a first device and at least one second device, the method comprising:

providing a set of data structures at the first device, each data structure including at least one descriptive field and an associated at least one data value field, the at least one data value field including the at least one data value, the at least one descriptive field including a usage type field having usage type data to associate the at least one data value field with a data type,

for each data structure in a first plurality of the set of data structures provided, providing a template identification for the at least one data value included therein, and providing that the usage type data included therein associates the at least one data value field included therein with a template data type,

whereas, the usage type data included therein associating the at least one data value field included therein with the template data type, indicates that the data structure is to be stored at the second device as a template associated with the template identification provided with the said data structure,

sending the first plurality of the set of data structures from the first device to the second device,

for each data structure in a second plurality of the set of data structures provided, providing a template identification for the at least one data value included therein, the template identification corresponding to the template identification associated with one of the plurality of templates stored at the second device, and providing that the usage type data included therein associates the at least one data value field included therein with a data-only data type,

whereas, the usage type data included therein associating the at least one data value field included therein with the data-only data type indicates that the template identification provided with the said data structure is to be used for retrieving at the second device a stored template associated with the template identification, the stored template being used for extracting data values from the data structure based on the stored template, and

when the usage type data associates the at least one data value field with a complete data structure, the usage type data indicating the type of the at least one data value to be extracted from the at least one data value field at the at least one second device.

2. A method according to claim 1, where at least one data structure in the set of data structures includes at least one header data structure and at least one non-header data structure, the at least one header data structure specifying a machine architecture associated with the first device.

3. A method according to claim 2, where the at least one data structure is a value record, the at least one header data structure is a header container, and the at least one non-header data structure is at least one of:

a single container, a double container, a bytegroup container, a string container, an array container, and a structured data container.

4. A method according to claim 1, where at least one data structure in the set of data structures includes at least one of:

a data structure version type field and a template field.

5. A method according to claim 1, where the at least one descriptive field includes a pointer to at least one second data structure, the at least one second data structure including at least one descriptive field and an associated at least one data value field.

6. A method according to claim 1, where extracting the at least one data value at the second device includes:

identifying a pointer to at least one second data structure, and,

based on the pointer and at least one descriptive field in the at least one data structure, extracting the at least one data value from the at least one data value field.

7. A method according to claim 6, further comprising:

iteratively returning to identifying a pointer until the pointer value is NULL.

8. A method according to claim 1, where the first device and at least one of the at least one second device have a different architecture.

9. A method according to claim 1, where at least one data structure in the set of data structures includes at least two data structures having different usage type data.

10. A method according to claim 1, where the usage type data indicates at least one of:

a signed short integer type, a signed long integer type, a character type, a signed real number type, an unsigned short integer type, an unsigned long integer type, a boolean type, an unsigned character type, a 65-bit real number type, a string type, and an undetermined type.

11. A method according to claim 1, where extracting the at least one data value at the second device includes:

determining from the at least one descriptive field that the at least one data structure is a template, and,

based on whether the at least one data structure is a template, identifying a template identifier from the at least one descriptive field, and, storing the template with the template identifier.

12. A method according to claim 1, where extracting the at least one data value at the second device includes:

determining from the at least one descriptive field that the at least one data structure includes at least one data-only data structure, and,

based on the determination, identifying a template identifier from the at least one descriptive field, retrieving a template associated with the template identifier, and extracting the at least one data value from the at least one data structure based at least on the template.

13. A method according to claim 12, where retrieving includes retrieving over at least one of a wired and a wireless network.

14. A method according to claim 12, where extracting based at least on the template includes extracting based on the at least one descriptive field of the retrieved template.

15. A method according to claim 1, where the first device uses a first address space, and the at least one second device uses at least one distinct second address space.