System for activating new service in client server network by reconfiguring the multilayer network protocol stack dynamically within the server node

• US 5,548,726 A
• Filed: 12/17/1993
• Issued: 08/20/1996
• Est. Priority Date: 12/17/1993
• Status: Expired due to Term

• Current Assignee: Apple Inc.
• Original Assignee: Taligeni Incorporated
• Inventors: Pettus, Christopher E.
• Primary Examiner(s): Lee, Thomas C.
• Assistant Examiner(s): MEKY, MOUSTAFA M
• Application Number:
  US08/169,867
• Time in Patent Office: 977 Days
• Field of Search: 395/600, 395/650, 395/700, 395/200.09, 395/200.16
• US Class Current: 709/221
• CPC Class Codes: H04L 61/4552 Lookup mechanisms between a plurality of directories; Synchronisation of directories, e.g. metadirectories
• CPC Class Codes: H04L 61/4553 Object oriented directories, e.g. common object request broker architecture [CORBA] name server
• CPC Class Codes: H04L 67/133 Protocols for remote procedure calls [RPC]
• CPC Class Codes: H04L 67/61 taking into account QoS or priority requirements
• CPC Class Codes: H04L 69/18 Multiprotocol handlers, e.g. single devices capable of handling multiple 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

Abstract

On a multi-node client server network, a client node obtains access to remote services by means of a communications directory service located in each node of the network. The communications directory service includes a tree structure to which existing directory services and other network services can be added. The tree structure has a plurality of nodes each of which includes specific methods that query and browse the associated directory service if such actions are supported by the underlying service. The communications directory service further includes shared libraries which store a service object associated with each service offered on the network. The service object, in turn, includes the service exchange address and communication link configuration information. A client desiring to access a remote service retrieves the appropriate service object from the communications directory service and uses the service object to set up the communications path.

Claims

1. A method for activating a new service in a client-server network system having a plurality of communications links, a server node with a memory therein connectable to each of the plurality of communications links by a multilayer dynamically reconfigurable network protocol stack, a service program in the server node memory, a communications directory service program in the server node memory and a networking service program in the server node memory, the method comprising the steps of:

(a) storing a plurality of stack definitions in the server node memory wherein each of the plurality of stack definitions corresponds to one of the plurality of communication links and the each stack definition includes a set of layer definitions for controlling the processing of data in each layer of the multilayer network protocol stack from a transport layer through a physical layer and the interactions between layers;

(b) storing in the server node memory service object class information including information for defining a data structure for holding a reference to one of the plurality of stack definitions and logic which is responsive to type and quality of service information for inserting a reference to at least one of the plurality of stack definitions into the data structure and for constructing a session layer of the multilayer network protocol stack;

(c) creating a service object from the service object class information by passing in a type of service to the communications directory service and executing the logic to insert a reference to a stack definition and construct a session layer;

(d) sending the service object to the networking service program; and

(e) using the reference to the stack definition and the session layer in the service object to reconfigure the multilayer network protocol stack.

2. The method of claim 1 wherein step (e) comprises the steps of:

(e1) returning an exchange address of the session layer in the multilayer network protocol stack to the communications directory service program; and

(e2) storing the exchange address in the service object.

3. The method of claim 1 wherein the communications directory service program has a directory true and wherein the method further comprises the step of:

(f) registering the service object in the directory tree.

4. The method of claim 1 wherein the new service is accessible on a plurality of communications links and step (c) comprises the steps of:

(c1) executing the logic in the service object class information to insert references to a stack definition for each of the plurality of communications links into the data structure; and

(c2) executing the logic in the service object class information to construct a session layer including logic for selecting one of the stack definition references in the data structure based on at least one of (a) the quality of service desired and (b) the availability of the plurality of communication links.

5. The method of claim 4 wherein step (d) comprises the step of:

(d1) sending the service object to the networking service program via the service program.

6. The method of claim 5 wherein step (d1) comprises the steps of:

(d1a) creating a service program interface in the server node memory;

(d1b) creating a configuration data stream from the service program interface to the networking service program; and

(d1c) streaming the service object from the communication directory service program via the service program interface and the configuration data stream to the networking service program to configure the multilayer network protocol stack.

7. The method of claim 6 wherein step (e) comprises the step of:

(e1) returning an exchange address of the session layer in the multilayer network protocol stack to the communications directory service program via the configuration data stream and the service program interface.

8. The method of claim 1 further comprising the step of:

(g) sending the service object to communications directory programs in other nodes on the client-server network system.

9. Apparatus for activating a new service in a client-server network system having a plurality of communications links, a server node with a memory therein connectable to each of the plurality of communications links by a multilayer dynamically reconfigurable network protocol stack, a service program in the server node memory, a communications directory service program in the server node memory and a networking service program in the server node memory, the apparatus comprising:

(a) means for storing a plurality of stack definitions in the server node memory wherein each of the plurality of stack definitions corresponds to one of the plurality of communication links and the each stack definition includes a set of layer definitions for controlling the processing of data in each layer of the multilayer network protocol stack from a transport layer through a physical layer and the interactions between layers;

(b) means for storing in the server node memory service object class information including information for defining a data structure for holding a reference to one of the plurality of stack definitions and logic which is responsive to type and quality of service information for inserting a reference to at least one of the plurality of stack definitions into the data structure and for constructing a session layer of the multilayer network protocol stack;

(c) means controlled by the service program for creating a service object from the service object class information by passing in a type of service to the communications directory service and executing the logic to insert a reference to a stack definition and construct a session layer;

(d) means responsive to an activation request from the service program for sending the service object to the networking service program; and

(e) means in the networking service program and responsive to the service object for reconfiguring the multilayer network protocol stack using the reference to the stack definition and the session layer in the service object.

10. The apparatus of claim 9 wherein the reconfiguring means comprises:

means responsive to the configuration of the session layer in the multilayer network protocol stack for returning an exchange address of the session layer in the multilayer network protocol stack to the communications directory service program; and

means in the communications directory service and responsive to the exchange address for storing the exchange address in the service object.

11. The apparatus of claim 9 wherein the communications directory service program has a directory tree and wherein the apparatus further comprises means for registering the service object in the directory tree.

12. The apparatus of claim 9 wherein the new service is accessible on a plurality of communications links and wherein the service object creating means comprises:

means for executing the logic in the service object class information to insert references to a stack definition for each of the plurality of communications links into the data structure; and

means for executing the logic in the service object class information to construct a session layer including logic for selecting one of the stack definition references in the data structure based on at least one of (a) the quality of service desired and (b) the availability of the plurality of communication links.

13. The apparatus of claim 9 wherein the sending means comprises first means for sending the service object to the networking service program via the service program.

14. The apparatus of claim 13 wherein the first sending means comprises:

means for creating a service program interface in the server node memory;

means for creating a configuration data stream from the service program interface to the networking service program; and

means for streaming the service object from the communication directory service program via the service program interface and the configuration data stream to the networking service program to configure the multilayer network protocol stack.

15. The apparatus of claim 14 wherein the reconfiguring means comprises means for returning an exchange address of the session layer in the multilayer network protocol stack to the communications directory service program via the configuration data stream and the service program interface.

16. The apparatus of claim 9 further comprising means for sending the service object to communications directory programs in other nodes on the client-server network system.

17. A computer program product for activating a new service in a client-server network system having a plurality of communications links, a server node with a memory therein connectable to each of the plurality of communications links by a multilayer dynamically reconfigurable network protocol stack, a service program in the server node memory, a communications directory service program in the server node memory and a networking service program in the server node memory, the computer program product comprising a computer usable medium having computer readable program code including:

(a) means for storing a plurality of stack definitions in the server node memory wherein each of the plurality of stack definitions corresponds to one of the plurality of communication links and the each stack definition includes a set of layer definitions for controlling the processing of data in each layer of the multilayer network protocol stack from a transport layer through a physical layer and the interactions between layers;

(b) means for storing in the server node memory service object class information including information for defining a data structure for holding a reference to one of the plurality of stack definitions and logic which is responsive to type and quality of service information for inserting a reference to at least one of the plurality of stack definitions into the data structure and for constructing a session layer of the multilayer network protocol stack;

(c) means controlled by the service program for creating a service object in the server node memory from the service object class information by passing in a type of service to the communications directory service and executing the logic to insert a reference to a stack definition and construct a session layer;

(d) means responsive to an activation request from the service program for sending the service object to the networking service program; and

(e) means in the networking service program and responsive to the service object for reconfiguring the multilayer network protocol stack using the reference to the stack definition and the session layer in the service object.

18. A method for activating a new service in a client-server network system having a plurality of communications links, a server node with a memory therein connectable to each of the plurality of communications links by a multilayer dynamically reconfigurable network protocol stack, a service program in a service program address space of the server node memory, a communications directory service program in a system address space of the server node memory and a networking service program in the system address space of the server node memory, the method comprising the steps of:

(a) storing a plurality of stack definitions in the system address space of the server node memory wherein each of the plurality of stack definitions corresponds to one of the plurality of communication links and the each stack definition includes a set of layer definitions for controlling the processing of data in each layer of the multilayer network protocol stack from a transport layer through a physical layer and the interactions between layers;

(b) storing in the system address space of the server node memory service object class information including information for defining a data structure for holding a reference to one of the plurality of stack definitions and logic which is responsive to type and quality of service information for inserting a reference to at least one of the plurality of stack definitions into the data structure and for constructing a session layer of the multilayer network protocol stack;

(c) creating a service object in the system address space from the service object class information by passing in a type of service to the communications directory service and executing the logic to insert a reference to a stack definition and construct a session layer;

(d) sending the service object to the networking service program; and

(e) using the reference to the stack definition and the session layer in the service object to reconfigure the multilayer network protocol stack.

19. Apparatus for activating a new service in a client-server network system having a plurality of communications links, a server node with a memory therein connectable to each of the plurality of communications links by a multilayer dynamically reconfigurable network protocol stack, a service program in a service program address space of the server node memory, a communications directory service program in a system address space of the server node memory and a networking service program in a system address space of the server node memory, the apparatus comprising:

(a) means for storing a plurality of stack definitions in the system address space wherein each of the plurality of stack definitions corresponds to one of the plurality of communication links and the each stack definition includes a set of layer definitions for controlling the processing of data in each layer of the multilayer network protocol stack from a transport layer through a physical layer and the interactions between layers;

(b) means for storing in the system address space service object class information including information for defining a data structure for holding a reference to one of the plurality of stack definitions and logic which is responsive to type and quality of service information for inserting a reference to at least one of the plurality of stack definitions into the data structure and for constructing a session layer of the multilayer network protocol stack;

(c) means controlled by the service program for creating a service object in the system address space from the service object class information by passing in a type of service to the communications directory service and executing the logic to insert a reference to a stack definition and construct a session layer;

(d) means responsive to an activation request from the service program for sending the service object to the networking service program; and

(e) means in the networking service program and responsive to the service object for reconfiguring the multilayer network protocol stack using the reference to the stack definition and the session layer in the service object.