Replacing Sesame with Stardog

[Mike Roberts]

Hello,

I'm trying to integrate Stardog into our software. I read Stardog documentation and this google group but I can not understand what grades of compatibility/compliance Stardog has with Openrdf Sesame.

We currently use Sesame's RemoteRepositoryManager but I don't know how to turn into Stardog. Should I start Stardog server and connect to it as I used to do with Sesame server?

Here is the main piece of code where we retrieve an existing repository or we create a new one using a ttl configuration file.

Is there any good samaritan that could help me in modifying it?

  RemoteRepositoryManager repManager = new RemoteRepositoryManager(serverLocation);
  repManager.initialize();

  Repository systemRepository = repManager.getSystemRepository();
  if (!RepositoryConfigUtil.hasRepositoryConfig(systemRepository, getRepositoryID())) {
    ValueFactory vf = systemRepository.getValueFactory();
    Graph graph = new GraphImpl(vf);
    Map<String, String> vars = new HashMap<String, String>();
    vars.put("ontology.dir", ontologyDir.getAbsolutePath());
    vars.put("repository.id", getRepositoryID());
    vars.put("repository.label", getRepositoryID());
    vars.put("imports.files", storage.getModelFilesToImport());
    vars.put("imports.namespaces", storage.getModelNamespacesToImport());
    RDFParser rdfParser = Rio.createParser(RDFFormat.TURTLE, vf);
    rdfParser.setRDFHandler(new StatementCollector(graph));
    Reader in = substituteVariables(vars, ttlFile.getInputStream());
    rdfParser.parse(in, RepositoryConfigSchema.NAMESPACE);
    Resource repositoryNode = GraphUtil.getUniqueSubject(graph, RDF.TYPE, RepositoryConfigSchema.REPOSITORY);
    RepositoryConfig repConfig = RepositoryConfig.create(graph, repositoryNode);
    repConfig.validate();
    RepositoryConfigUtil.updateRepositoryConfigs(systemRepository, repConfig);
  }
  repository = repManager.getRepository(getRepositoryID());
  RepositoryConnection connection = repository.getConnection();

Thanks a lot

Mike

[Mike Grove]

We don't support RemoteRepositoryManager; we are not using Sesame's protocol so it's built-in repository management does not work with the Stardog DBMS.  With that said, I'm working on changes to make it easier to integrate Stardog into Sesame's workbench and create/manage Stardog databases without relying directly on Stardog code.

I'm shooting for the next release for those changes, but in the meantime, the distributed example "SesameExample.java" shows how you'd create a Stardog-backed Repository instances.  You'd have to run the server in embedded mode as the example does, or run it separately on the CLI.  You can use the admin API, or the CLI to create databases and then connect to them using StardogRepository.

Cheers,

Mike

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[Mike Roberts]

Thank you Mike.

For sake of completeness I post the code I wrote to replace Sesame RemoteRepositoryManager part

 AdminConnection dbms = AdminConnectionConfiguration.toServer("snarl://localhost:5820/").credentials("admin", "admin").connect();
 ConnectionConfiguration cconf = null;
 if(dbms.list().contains(getRepositoryID()))
   cconf = ConnectionConfiguration.to(getRepositoryID()).server("snarl://localhost:5820/").credentials("admin", "admin");
 else {
   cconf = dbms.disk(getRepositoryID()).searchable(true).create();
 }
 cconf.reasoning(ReasoningType.SL);
 repository = new StardogRepository(cconf);
 if(!repository.isInitialized())
 repository.initialize();
 RepositoryConnection connection = repository.getConnection();