CloudWpsFactory

!include includes/skins.iuml skinparam backgroundColor #FFFFFF skinparam componentStyle uml2 !include target/rst/in/group___cloud_wps_factory.iuml

This component enables Cloud Appliance that exposes a WPS service to be exposed as a processing service automatically.

Using the OneClient to the cloud, it retrieve the VMs that expose WPS interface and load the services. The following diagrams describes how the WPS services are discovered and offered to the users dynamically. Only operations that differs from the ones described in WPS Provider module are illustrated.

!define DIAG_NAME WPS Service Cloud Discovery Sequence Diagram participant "WebClient" as WC participant "WebServer" as WS participant "Provider" as P << Virtual Machine >> participant "Cloud Provider" as C << OpenNebula >> autonumber == Get Capabilities == WC -> WS: GetCapabilities request activate WS WS -> C: List all VMs that are tagged as WPS provider WS -> WS: create temporary WPS providers loop on each provider WS -> P: GetCapabilities WS -> WS: extract services from GetCapabilities using remote identifier loop on each service WS -> WS: get service info (identifier, title, abstract) end end WS -> WS: aggregate all services info into response offering WS -> WC: return aggregated GetCapabilities deactivate WS == Describe Process == WC -> WS: DescribeProcess request activate WS WS -> C: get service provider WS -> P: GetCapabilities WS -> WS: extract describeProcess url from GetCapabilities using remote identifier WS -> WS: build describeProcess request WS -> P: DescribeProcess WS -> WC: return result from describeProcess deactivate WS == Execute == WC -> WS: Execute request activate WS WS -> C: get service provider WS -> P: GetCapabilities WS -> WS: extract execute url from GetCapabilities using remote identifier WS -> WS: build execute request WS -> P: Execute alt case error WS -> WC: return error else case success WS -> DB: store job WS -> WS: update job RetrieveResultServlet url WS -> WC: return created job end deactivate WS == Search WPS process == WC -> WS: WPS search request activate WS WS -> C: Load all Providers loop on each provider WS -> P: GetCapabilities WS -> WS: get services info loop on each service WS -> WS: create local identifier and cache remote identifier WS -> WS: use local server url as baseurl WS -> WS: add service info to the response end end deactivate WS footer DIAG_NAME (c) Terradue Srl endfooter

Dependencies

  • calls Cloud Provider to retrieve the computing appliances
  • calls OneClient to contact OpenNebula interface
  • creates WPS Provider for each computing appliance that expose WPS
  • creates WPS Service for each process found in GetCapabilities of the WPS Service