Hi Christopher,
This problem has now been fixed and will appear in the next release of
OWLIM.
I understand that the problem is simply that the statement counters were
not being reset after the clear operation.
Thanks for reporting this.
Regards,
barry
Barry Bishop
OWLIM Product Manager
Ontotext AD
Tel: +43 650 2000 237
email: [email protected]
skype: bazbishop
www.ontotext.com
On 15/05/12 17:12, Lott, Christopher M wrote:
I am working with owlim-lite-5.0.5001 accessed as a remote HTTP repository using Sesame
2.6.5. I noticed that invoking the clear method doesn't seem to clear things out; in fact
on a new repository, the size *increases* after I call the clear method. This seems to
be a consequence of using RDFS reasoning rules, because if I use a repository with
"empty" rule set, the size behaves the same as an in-memory or MySQL
repository, namely that clear() returns it to zero. Would someone please explain?
I've attached a program that demonstrates the behavior. Also see below for the
transcript of using the sesame console application to create an empty
repository on which I ran the program.
---
import org.openrdf.model.Resource;
import org.openrdf.model.URI;
import org.openrdf.model.ValueFactory;
import org.openrdf.model.vocabulary.RDF;
import org.openrdf.repository.Repository;
import org.openrdf.repository.RepositoryConnection;
import org.openrdf.repository.http.HTTPRepository;
import org.openrdf.repository.sail.SailRepository;
import org.openrdf.sail.memory.MemoryStore;
import org.openrdf.sail.rdbms.mysql.MySqlStore;
/**
* Tests Sesame repository implementation of size method. On an in-memory or a
* MySQL repository, after calling the clear() method the size() method returns
* zero. On a remote Owlim repository that uses rule-set "rdfs", after calling
* clear() the size() method returns a number larger than before the clear().
*
* @author clott
*/
public class TestAddRemoveClear {
/**
* Arguments control which repository implementation is used. Invoke
with:
*<UL>
*<LI>1 argument: the URI of a remote repository
*<LI>4 arguments: the host name, database name, user name and password
for
* a MySQL repository
*<LI>Other argument count: ignores arguments, uses an in-memory
* repository.
*</UL>
*
* @param args
*/
public static void main(String[] args) {
try {
// Get started
Repository repo = null;
if (args.length == 4) {
System.out.println("Using mysql repository on host
" + args[0]);
MySqlStore sqlStore = new MySqlStore(args[1]);
sqlStore.setServerName(args[0]);
sqlStore.setPortNumber(3306);
sqlStore.setUser(args[2]);
sqlStore.setPassword(args[3]);
repo = new SailRepository(sqlStore);
} else if (args.length == 1) {
System.out.println("Using remote repository at
" + args[0]);
repo = new HTTPRepository(args[0]);
} else {
System.out.println("Creating an in-memory Sail
repository");
repo = new SailRepository(new MemoryStore());
}
// Init the repo and connect
System.out.println("Initializating and connecting");
repo.initialize();
RepositoryConnection con = repo.getConnection();
// Get the initial size
Long beforeSize = con.size();
System.out.println("Size at start is " + beforeSize);
// Create some resources and literals to use in
statements
ValueFactory f = repo.getValueFactory();
String namespace = "http://example.org/ontology#";;
URI personClassUri = f.createURI(namespace + "Person");
// Add the entity
System.out.println("Adding entity of type Person");
Resource entity = f.createBNode();
con.add(entity, RDF.TYPE, personClassUri);
// Get the modified size
Long modSize = con.size();
System.out.println("Size after add is " + modSize);
// Remove the newly added statements
System.out.println("Removing the newly added entity");
con.remove(entity, RDF.TYPE, personClassUri);
long afterSize = con.size();
System.out.println("Size after remove is " + afterSize);
System.out.println("Clearing repo");
con.clear();
long clearSize = con.size();
System.out.println("Size after clear is " + clearSize);
// Drop connection and release the lock on the
repository
System.out.println("Closing connection and shutting
down");
con.close();
repo.shutDown();
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
---
$ openrdf-sesame-2.6.5/bin/console.sh
11:03:59.830 [main] DEBUG info.aduna.platform.PlatformFactory - os.name = linux
11:03:59.834 [main] DEBUG info.aduna.platform.PlatformFactory - Detected Posix
platform
Connected to default data directory
Commands end with '.' at the end of a line
Type 'help.' for help
connect http://localhost:8080/openrdf-sesame .
Disconnecting from default data directory
Connected to http://localhost:8080/openrdf-sesame
create owlim-lite .
Please specify values for the following variables:
Repository ID [owlim-lite-test]: lott
Repository title [OWLIM-Lite test repository]: Lott rdfs
Storage folder [storage]:
Rule-set [owl-horst-optimized]: rdfs
Base URL [http://example.org/owlim#]:
Entity index size [200000]:
No Persistence [false]:
Imported RDF files(';' delimited):
Default namespaces for imports(';' delimited):
Repository created
quit .
Disconnecting from http://localhost:8080/openrdf-sesame
Bye
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