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The Data Access Component (DAC) plays a new role in the FEWS system. It allows webservices that are deployed in the same servlet container as the DAC to communicate directly with the FEWS central database.
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The DAC makes use of the FEWS OpenAPI to communicate with the attached webservices.
The main functionality of the Data Access Component DAC is given below.
- Allow webservice deployed in a Servlet container such as Tomcat to access the FEWS central database directly or through an instance of the DataStore component. Through the DataStore component it will be possible to access the following information:
- read / write timeseries
- read / log messages
- read FEWS configuration
- run workflows
Design
The Design of the FEWS data access component is directly linked to the FEWS database model. For more information on the design of the FEWS database model we refer to documentation of the Master Controller database.
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