Scope

Develop and describe a prototype for the OOI messaging service, comprising messaging service mechanisms based on a solid theory for network IPC, and application clients to interface with the messaging service.

Tasks

• Develop a client for the messaging service (Magnet)
  • Applications are represented by role protocols, which rely on connections to their role protocol counterparts via names. Together this realizes an application protocol (interaction pattern) that exists within a contractual context
  • Application role protocols are implemented as Twisted protocols for this iteration
  • Magnet via Twisted provides a connect, as well as a request listener with reply facility using the messaging service
  • Magnet provides name to address lookup
  • Magnet separates connection and protocol configurator from the definition of the role protocols
  • Magnet provides several telling examples
• Messaging service specification
• DIF-AMQP Integration
• Develop an end-to-end story for reporting and reviewing

Design

The figure below shows the design of a service application using the Magnet messaging client. Magnet works in conjunction with the Twisted framework and txAMQP.

The figure below shows a scenario of resource agents interacting using Magnet messaging service clients