Executive Summary: An application developer or science gateway developer needs to create an application that subscribes to resource status information so the application receives asynchronous, best-effort updates when the status changes or is refreshed. Application examples include: a web application (e.g., science gateway or user portal), a workflow system (e.g., Galaxy, Pegasus, Kepler), a mobile application, or a system monitoring service.
|Component||User facing?||Component’s role in the capability|
|Information Services||yes||The Information Services Warehouse provides a central, reliable, fault tolerant, and scalable repository of discoverable resource information. This component is specifically designed to support the discovery use case and often contains copies of the authoritative resource information produced or managed by other components. The Warehouse REST API implements RESTful interfaces to update and search CI resource information and enables the “pull” method for discovery. Information Service Routers move/route information between publish/subscribe components and update/search components. This enables published information to be discoverable thru search interfaces, and updated information to be forwarded to subscribers.|
|XSEDE Publish/Subscribe Service (RabbitMQ)||no||Implements the AMQP standard for publishing and subscribing to CI resource information and enables the “push” method for discovery.|