Mediated information flow

• US 20050060380A1
• Filed: 07/30/2004
• Published: 03/17/2005
• Est. Priority Date: 07/31/2003
• Status: Active Grant

• Current Assignee: Cloudsoft Corp. Ltd.
• Original Assignee: Enigmatec Corporation
• Inventors: Dearle, Alan, Connor, Richard
• Granted Patent: US 8,307,112 B2
• Time in Patent Office: Days
• US Class Current: 709/206
• CPC Class Codes: H04L 45/306 Route determination based on the nature of the carried application
• CPC Class Codes: H04L 67/10 in which an application is distributed across nodes in the network software deployment G06F8/60; multiprogramming arrangements G06F9/46
• CPC Class Codes: H04L 67/1001 for accessing one among a plurality of replicated servers
• CPC Class Codes: H04L 67/1008 based on parameters of servers, e.g. available memory or workload monitoring of computer activity G06F11/30
• CPC Class Codes: H04L 67/1023 based on a hash applied to IP addresses or costs
• CPC Class Codes: H04L 67/563 Data redirection of data network streams
• CPC Class Codes: H04L 67/63 Routing a service request depending on the request content or context

Abstract

There is provided a method for mediating the flow of messages in a computer network having a mediation architecture that includes a plurality of logical nodes in a cubic mediation arrangement. The method comprises handing over one or more mediation tasks between a donor mediator module and a recipient mediator module in response to a change request while maintaining system invariants.

Claims

1. A method for mediating the flow of messages in a computer network, wherein the computer network has a cubic mediation network that includes:

two local point of presence (LPP) modules for interfacing between the mediation network and client programs;

two mediator (M) modules for hosting mediation tasks;

two mediator router (MR) modules for analyzing the content of incoming messages, each MR module routing the incoming messages to a predetermined M module in dependence upon said content; and

two transmission proxy (TP) modules for forwarding messages to at least one of said LPP modules,

wherein, in the method, incoming messages to the mediation network are propagated along a mediation cycle that comprises the steps of;

an LPP module, addressing incoming messages to a respective one of said at least one mediator router (MR) modules;

in said addressed MR module, analyzing the content of incoming messages and routing said messages to a predetermined mediator module in dependence upon said analyzed content;

in said predetermined mediator module, applying the mediation task to said analyzed messages and directing mediated messages to a respective one of said TP modules; and

in said TP module that receives said mediated messages, forwarding said mediated messages to at least one of said LPP modules.

2. A method as claimed in claim 1, wherein the two mediator modules comprise a donor mediator module and a recipient mediator module,

the method further comprising:

inducing a handover of a mediation task from the donor mediator module to the recipient mediator module by directing a control message as an incoming message along the mediation cycle.

3. A method as claimed in claim 2, wherein the control message is a mediator handover message, the content of the mediator handover message describing the reallocation of content having a predetermined content tag from the donor mediator module to the recipient mediator module, where the donor mediator module is currently registered as handling said content, and

wherein the direction of the mediator handover message comprises:

from a predetermined LPP module, sending the mediator handover message to a respective associated MR module;

at the associated MR module, reading said content tag and forwarding the message to the donor mediator module; and

upon receipt of the mediator handover message, the donor mediator module;

changing mediator node state;

sending a MEDIATOR_HANDOVER message to the recipient mediator module, the MEDIATOR_HANDOVER message containing the content of the mediator handover message;

sending a MEDIATOR_CHANGED message to an associated TP module; and

then changing state in order to forward messages containing the content tag to the recipient mediator module.

4. A method as claimed in claim 3, further comprising:

the TP module forwarding the MEDIATOR_CHANGED message to at least one LPP module;

the recipient mediator module generating a NEW_MEDIATOR_ACTIVE message, the NEW_MEDIATOR_ACTIVE message having a payload corresponding to the reallocated content, and broadcasting said NEW_MEDIATOR_ACTIVE message to all TP modules associated therewith; and

the LPP module buffering all incoming messages between receipt of the MEDIATOR_CHANGED message and receipt of the NEW_MEDIATOR_ACTIVE message.

5. A method as claimed in claim 4, further comprising:

the LPP module then forwarding the NEW_MEDIATOR_ACTIVE message to the associated MR module; and

whenever a MR module receives a NEW_MEDIATOR_ACTIVE message, updating a routing table for said MR module to cause future content matching the payload of the NEW_MEDIATOR_ACTIVE message to be sent to the recipient mediator module rather than the donor mediator module;

informing the donor mediator module that the routing table has been updated, the donor mediator module thereafter ceasing to forward messages once all MR modules have been informed that the recipient mediator module is now the mediator module for the reallocated content.