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etapAPI is ETAP's public-facing RESTful API and can be consumed from any language on any device. The device can be the computer ETAP runs on or another device on the same network. etapAPI enables interoperability with ETAP, which allows automation, scripting, and remote studies as a service to callers.
The etapAPI is a RESTful service that runs inside DataHub™, which is ETAP’s gateway for all data exchanges and is used by ETAP and third-party tools via a secure connections (https). While DataHub hosts various services (internal and public), etapAPI is the service mostly used by ETAP customers.
The etapAPI is divided into five major sections: Application, DNP3 Server, Project Data, Studies, and Scenario. These sections can all be explored via the Swagger page, which enables users to see and interact with the etapAPI without having to write client code, and is entirely browser based. The Swagger page allows user to experiment and see features offered in etapAPI.
This section contains calls about the ETAP application. For example, in this section it is possible to retrieve both user name and project name.
This section contains calls to perform studies. For example, one can request that ETAP run a load flow study from the Swagger page.
This section contains calls that return project data. For example, one can request to view all bus elements or get parameters for elements by type. Users can also modify project data for example create/delete elements, modify element properties for power ratings, element name, service state, and enter study case settings for iterations, precision, simulation time.
This section contains calls that allow interacting with the ETAP Scenario Wizard. With ETAP Scenario Wizard one can trigger pre-configured studies remotely and invoke UI updates.
Each instance of ETAP exposes a dedicated REST API for public consumption over secure http (https). One machine can run several ETAP instances (one per project) or one instance of ETAP can be commissioned on a per-machine basis. The latter is better suited for a large volume of parallel workloads (e.g. running a large number of studies in parallel).
Callers can call ETAP from any REST-compatible client. Some of the clients we currently work with:
Historically ETAP supported SOAP services through WCF WSDL files as the backend. These services are being migrated toward the more interoperable alternative (REST). Therefore, while ETAP currently supports SOAP services, these will be deprecated soon.
ETAP's REST API is organized into sections as summarized by the table below.
REST is an acronym for Representational State Transfer. It is an architectural style for distributed hypermedia systems and was first presented by Roy Fielding in 2000 in his dissertation.
Representational state transfer (REST) is a software architectural style that defines a set of constraints to be used for creating Web services. Web services that conform to the REST architectural style, called RESTful Web services, provide interoperability between computer systems on the internet. RESTful Web services allow the requesting systems to access and manipulate textual representations of Web resources by using a uniform and predefined set of stateless operations. Other types of Web services, such as SOAP Web services, expose their own arbitrary sets of operations.
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