Discovery

Configuration

The configuration have to be defined in a json format. It should a contains a list of “source” definition and a general settings.

example

{
     "sources" : [{
       "id"  : "dbpedia",
       "url" : "https://dbpedia.org/sparql",
       "mimetype" : "application/sparql-query",
       "method" : "POST"
     }],
     "settings" : {
       "cache" : true,
       "logLevel" : "info",
       "sizeBatchProcessing" : 10,
       "pageSize" : 10
     }
}

Sources definition

each source defined un identifier.

• id : <identifyTheSourceEndpoint>

Three types of RDF sources can be exploited : SPARQL endpoint, RDF Files, RDF inlining content

SPARQL endpoint

• mimetype = "application/sparql-query"
• url = <URL : String>

optional argument

• method = "POST" | "POST_ENCODED" | "GET"
• auth = "basic" | "digest" | "bearer" | "proxy"
• login = <login>
• password = <password>

example

source definition to query the DBpedia SPARQL endpoint.

{
   "id"       : "dbpedia",
   "url"      : "https://dbpedia.org/sparql",
   "mimetype" : "application/sparql-query",
   "method"   : "POST"
 }

RDF files

• mimetype = "text/turtle" | "text/n3" | "text/rdf-xml"
• file = <URL file : String>

example

{
   "id"       : "fileMetabo",
   "mimetype" : "text/turtle",
   "file"     : "https://raw.githubusercontent.com/p2m2/discovery/develop/shared/src/test/resources/metabo.ttl"
 } 

RDF inline content

• mimetype = "text/turtle" | "text/n3" | "text/rdf-xml"
• content = <String>

example

{
   "id"       : "local_content",
   "mimetype" : "text/turtle",
   "content"  : "<http://example.org/#subject1> <http://example.org/#predicate1> <http://example.org/#object1> ."
 } 

General settings

disable/unable cache query results

• cache = "true" | "false"

control the logging output with the log level

• logLevel = "trace" | "debug" | "info" | "warn" | "error" | "all" | "off"

"warn" is the default value.

customize pool batch processing (see datatype block)

• sizeBatchProcessing = <Int>

150 is the default value.

customize selectByPage

• pageSize = <Int>

10 is the default value.

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