The Delft-FEWS Web Operator Client (Web OC) will interact with the Delft-FEWS database by means of the FewsWebServices API. However, by using the FewsWebservices API, organizations are not limited to front-end applications developed by Deltares. There are various levels to interact with our software components (fig.1):
Diagram below shows the software architecture of the Web OC in relation to Delft-FEWS.
The following software frameworks are used to develop Web OC
Delft-FEWS Web OC | |
---|---|
Language | Typescript and Javascript |
Framework | Vue.js (Vue 3) |
UI Framework | Vuetify3 + Vite |
Maps | Maplibre |
Charts | d3js + custom, eCharts |
Please note that we are currently in the proces of migrating Web OC from the Vue 2 to Vue 3 framework.
Components 1 (Delft-FEWS database) and 2 (FewsWebServices API) in the diagram above are already part of the Delft-FEWS software suite. The license under which these components are made available and the manner in which they are provided will not change with introduction of the Web OC. Additionally, Deltares intends to offer new components 3 to 6 as in addition to the current Delft-FEWS software:
The idea behind the above architecture is that different consumers (existing or new FEWS end-users/intermediaries/consultants) of the Web OC software can connect at their relevant level of the architecture. A few examples:
Based on the described usage above, the Web OC TypeScript libraries and HTML5 components are available under the Permissive MIT license. This allows the use of Web OC libraries and components in packages developed by third parties with a different licensing model. Components 5 (Vue components) and 6 (Web OC application) are made available under the “Copyleft/protective” GNU AGPL license. With this license, it is prohibited for consumers to include the Vue components and/or the Web OC application as-is in their own software without also making the source code of such software available under the AGPL license, thus preventing it from becoming proprietary software.
In the case of Deltares customer-specific orders for one or more of the software components 1 to 6 (Figure 1: Delft-FEWS Web OC Architecture), the existing FEWS executable License Agreement will be used. In the specific customer contract, a product will be delivered based on specific requirements, and within this customer contract, we will extract the product (IP, liability, warranties) from the customer contract terms and apply the FEWS License Agreement terms, including the customer’s indemnification for the use of the FEWS component(s).
Information to be added.
The Delft-FEWS Web OC will become an integral part of the overall Delft-FEWS product (see section Development goals) for which Deltares provides dedicated S&M packages: https://oss.deltares.nl/web/delft-fews/services .