If the property sparqlUrl of the RepositoryFacade is not an empty string of set to null, the broker assumes that an external
Fuseki server should be used for persistence. So it will throw an exception if it in unable to establish a valid connection after
three retries. The property can be set via sparql.url in the application.propertier.
Changed the member functions getNewReadOnlyConnectionToFuseki and getNewWritableConnection of the RespositoryFacade
to check the existence of a valid connection to the fuseki server.
The broker tries to establish the connection three time in a row. In between it waits for 5 seconds. This is not
parameterizable. It is hard coded.
If the property sparqlUrl of the RepositoryFacade is set to null or is empty an in-mermory db is created and used.
Testing:
Without a Fuseki server running -> QueryHttpException was thrown as expected
With a Fuseki server running -> connection established and broker initializing of the Fuseki
[feature/retryConnectionFuseki] - 12.05.2022
RepositoryFacadeis not an empty string of set to null, the broker assumes that an external Fuseki server should be used for persistence. So it will throw an exception if it in unable to establish a valid connection after three retries. The property can be set viasparql.urlin theapplication.propertier.getNewReadOnlyConnectionToFusekiandgetNewWritableConnectionof theRespositoryFacadeto check the existence of a valid connection to the fuseki server.sparqlUrlof theRepositoryFacadeis set to null or is empty an in-mermory db is created and used.