ALPS document describing DISCO services

This is the ALPS document for an adhoc specification called DISCO (Discovering Interoperative Services for Continuous Operation). DISCO is a simple language for managing the adding/removing of services as well as the ability to search ("find") and make connections with ("bind") registered services.

Allows services to register/unreg themselves in a shared, searchable registry of available services.
Allows services (including the registry) to perform a "ping" health-check
Allows services to "find/bind" to other services based on profile and mediaType criteria

See http://open-disco.org for details.

• ALPS
• Application State Diagram
• Semantic Descriptors
  • bindCount (semantic), count (estimate) of clients using this service
  • bindForm (semantic), assert a claim to using a service (sent to the registry)
  • dashboard (semantic), Displays that status of running services
  • doBindForm (idempotent), input form for performing a bind operation
  • doRegisterForm (unsafe), input form for registering an availbale service
  • doRenewForm (unsafe), input form to renewing a service registration
  • doUnregisterForm (idempotent), returns HTTP status code
  • findForm (semantic), ask for a filtered list of registered services that match the supplied criteria
  • goBindLink (safe), returns bind form
  • goDashboard (safe), returns registry dashboard
  • goFindForm (safe), input form for finding available services
  • goFindLink (safe), returns find form
  • goHealthForm (safe), input form for pinging health status of a service
  • goHealthLink (safe), returns health-check form
  • goHome (safe), returns to home page
  • goItemForm (safe), input form for finding a single service
  • goItemLink (safe), returns item form
  • goRegisterLink (safe), returns register form
  • goRenewLink (safe), returns renewal form
  • goUnregisterLink (safe), returns unregister form
  • healthForm (semantic), send a health-check ping to a running service
  • healthLastPing (semantic), last date/time registry receigved a ping from the service
  • healthTTL (semantic), time-to-live (in seconds) for a valid health-check response
  • healthURL (semantic), URL to use when sending health-check pings
  • home (semantic), shared home page
  • itemForm (semantic), input for to get an item
  • mediaType (semantic), space separated list of mediaType identifiers
  • regDateTime (semantic), UTC date/time when the service registered
  • registerForm (semantic), input for registering a service
  • registryBlock (semantic), Collection of DISCO metadata
  • registryID (semantic), unique registry id of the service
  • registryURL (semantic), URL of registry
  • renewForm (semantic), sends a renewal request from a running service to the registry
  • renewLastPing (semantic), last date/time of successful renewal
  • renewTTL (semantic), time-to-live (in seconds) for a valid renewal
  • renewURL (semantic), URL to use when renewing the registry entry
  • semanticProfile (semantic), space separated list of profile URIs
  • serviceName (semantic), text name of service, non-unique
  • serviceURL (semantic), URL of service
  • status (semantic), current status of service [up, down, unknown
  • unregisterForm (semantic), returns HTTP status code
• Tags
  • choreography
  • ontology
  • taxonomy