Object-oriented communication interface for network protocol access using the selected newly created protocol interface object and newly created protocol layer objects in the protocol stack

• US 5,764,915 A
• Filed: 03/08/1996
• Issued: 06/09/1998
• Est. Priority Date: 03/08/1996
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Sharma, Mohan, Heimsoth, Daniel Dean, Yeung, Leo Yue Tak, Horn, Gary Randall, Turner, Laurie Beth
• Primary Examiner(s): Lee, Thomas C.
• Assistant Examiner(s): Ton, David
• Application Number:
  US08/611,849
• Time in Patent Office: 823 Days
• Field of Search: 370/258, 370/389, 395/200.01, 395/200.09, 395/700, 395/200.57, 395/200.58, 395/200.59, 395/200.6, 390/200.6
• US Class Current: 709/227
• CPC Class Codes: H04L 2101/604 Address structures or formats
• CPC Class Codes: H04L 2101/663 Transport layer addresses, e.g. aspects of transmission control protocol [TCP] or user datagram protocol [UDP] ports
• CPC Class Codes: H04L 61/5046 Resolving address allocation conflicts; Testing of addresses testing when self-assigning an address H04L61/5092
• CPC Class Codes: H04L 61/5061 Pools of addresses
• CPC Class Codes: H04L 67/01 Protocols
• CPC Class Codes: H04L 69/32 Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
• CPC Class Codes: H04L 69/325 in the network layer [OSI layer 3], e.g. X.25 H04L69/16 takes precedence
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

An object oriented protocol interface for establishing a communication path between communication endpoints in a computer network. The generic nature of the interface allows any and several protocol layers to be developed from the same set of protocol class objects. The interface to a communication endpoint for a client application is defined by instantiating a network definition object for the communication endpoint from a network definition class object. The communication endpoint itself is represented by instantiating a network address object from a network address class object. The protocol layers which form the protocol stack are derived from a set of protocol interface objects from a protocol interface class object and a set of protocol layer objects from a protocol layer class object. The objects forming each of the layers in the protocol stack differ in their capabilities according to their respective layer and the protocol which is provided by the protocol stack. The communication path is established in the protocol stack by calling methods in the sets of protocol interface and protocol layer objects.

Claims

1. A method for establishing communication paths between communication endpoints in a computer network, comprising the steps of:

responsive to a communication request from an application, creating a new instance of network address object from a network address class object to define a local communication endpoint for the application;

;

creating a new set of protocol layer objects, each from a respective protocol layer class object, and binding the new protocol layer objects to form an object based protocol stack for the local communication endpoint;

creating a new set of protocol interface objects, each from a respective protocol interface class object;

associating each newly created protocol interface object with a corresponding newly created protocol layer object to provide external interfaces for the requesting application to each of the newly created protocol layer objects; and

calling a selected newly created protocol interface object from the local communication endpoint to establish the communication path to the network to a remote communication endpoint through the selected newly created protocol interface object and newly created protocol layer objects in the protocol stack.

2. The method as recited in claim 1 wherein the requesting application is a communications API layer and the method further comprises the step of creating a new network definition object from a network definition class object to define an interface between the network address object and the communications API layer.

3. The method as recited in claim 1 wherein the requesting application is an operating system service and the selected protocol interface object provides an interface for a protocol layer situated at a mid level in the protocol stack.

4. The method as recited in claim 1 further comprising the step of deleting protocol layer objects, the protocol interface objects and the network address object at the conclusion of communication between the local and remote communication endpoints.

5. The method as recited in claim 1 wherein the protocol stack is formed for a first requesting application and wherein the steps are repeated for a second requesting application to form a second protocol stack.

6. The method as recited in claim 1 wherein the protocol stack is formed for a first requesting application using a first network protocol and wherein the steps are repeated for a second requesting application to form a second protocol stack using a second network protocol from a different set of protocol layer class objects and a different set of protocol interface class objects.

7. The method as recited in claim 1 wherein the protocol interface objects are implemented as state machines operable to a plurality of permitted states for a network protocol.

8. A system including processor, memory and network connection means for establishing communication paths between communication endpoints in a computer network, comprising:

means responsive to a communication request from an application for creating a new instance of network address object from a network address class object to define a local communication endpoint for the application;

means for creating a new set of protocol layer objects, each from a respective protocol layer class object, and binding the new protocol layer objects to form an object based protocol stack for the local communication endpoint;

means for creating a new set of protocol interface objects, each from a respective protocol interface class object;

means for associating each newly created protocol interface object with a corresponding newly created protocol layer object to provide external interfaces for the requesting application to each of the newly created protocol layer objects; and

means for calling a selected newly created protocol interface object from the local communication endpoint to establish the communication path to the network to a remote communication endpoint through the selected newly created protocol interface object and newly created protocol layer objects in the protocol stack.

9. The system as recited in claim 8 wherein the requesting application is a communications API layer and the system further comprises means for creating a new network definition object from a network definition class object to define an interface between the network address object and the communications API layer.

10. The system as recited in claim 8 wherein the requesting application is an operating system service and the selected protocol interface object provides an interface for a protocol layer situated at a mid level in the protocol stack.

11. The system as recited in claim 8 further comprising means for deleting protocol layer objects, the protocol interface objects and the network address object at the conclusion of communication between the local and remote communication endpoints.

12. The system as recited in claim 8 wherein the protocol stack is formed for a first requesting application using a first network protocol and wherein the steps are repeated for a second requesting application to form a second protocol stack using a second network protocol from a different set of protocol layer class objects and a different set of protocol interface class objects.

13. The system as recited in claim 8 wherein a plurality of protocol stacks are created for a corresponding plurality of requesting applications using a network protocol and the plurality of protocol stacks are bound to a persistent family protocol layer object for the network protocol.

14. The system as recited in claim 13 wherein a plurality of network protocols are used and a persistent family protocol layer object for each protocol is bound to a persistent data link layer object for all network protocols.

15. A computer program product in a computer readable medium for establishing communication paths between communication endpoints in a computer network, comprising:

means responsive to a communication request from an application for creating a new instance of network address object from a network address class object to define a local communication endpoint for the application;

means for creating a new set of protocol layer objects, each from a respective protocol layer class object, and binding the new protocol layer objects to form an object based protocol stack for the local communication endpoint;

means for creating a new set of protocol interface objects, each from a respective protocol interface class object;

means for associating each newly created protocol interface object with a corresponding newly created protocol layer object to provide external interfaces for the requesting application to each of the newly created protocol layer objects; and

means for calling a selected newly created protocol interface object from the local communication endpoint to establish the communication path to the network to a remote communication endpoint through the selected newly created protocol interface object and newly created protocol layer objects in the protocol stack.

16. The product as recited in claim 15 wherein the requesting application is a communications API layer and the system further comprises means for creating a new network definition object from a network definition class object to define an interface between the network address object and the communications API layer.

17. The product as recited in claim 15 wherein the requesting application is an operating system service and the selected protocol interface object provides an interface for a protocol layer situated at a mid level in the protocol stack.

18. The product as recited in claim 15 further comprising means for deleting protocol layer objects, the protocol interface objects and the network address object at the conclusion of communication between the local and remote communication endpoints.

19. The product as recited in claim 15 wherein the protocol stack is formed for a first requesting application using a first network protocol and wherein the steps are repeated for a second requesting application to form a second protocol stack using a second network protocol from a different set of protocol layer class objects and a different set of protocol interface class objects.

20. The product as recited in claim 15 further comprising a protocol information class for identifying characteristics of a network protocol.