protected void close() {
if (connection != null) {
try {
connection.close();
} catch (SQLException e) {
log.error("Could not close connection");
}
}
if (baseConnection != null) {
try {
baseConnection.close();
} catch (SQLException e) {
log.error("Could not close base connection");
}
}
}
/**
* Gets the Jena graph using options.
*
* <p>The Jena "Convenient" reification style is used when opening models: it allows to ignore
* reification quadlets when calling the statements list.
*
* @param forceReload boolean stating if the jena graph has to be reloaded using options
* @return the Jena graph (model)
*/
protected synchronized GraphConnection openGraph(boolean forceReload) {
// create model given backend
if (backend.equals("memory")) {
if (memoryGraph == null || forceReload) {
memoryGraph = ModelFactory.createDefaultModel(ModelFactory.Convenient);
memoryGraph.setNsPrefixes(namespaces);
}
return new GraphConnection((Connection) null, memoryGraph);
} else if (backend.equals("sql")) {
if (datasource == null) {
throw new IllegalArgumentException("Missing datasource for sql graph : " + name);
}
// create a database connection
Connection baseConnection;
try {
// try single-datasource non-XA mode
baseConnection = ConnectionHelper.getConnection(datasource);
if (baseConnection == null) {
// standard datasource usage
DataSource ds = DataSourceHelper.getDataSource(datasource);
baseConnection = ds.getConnection();
}
} catch (NamingException e) {
throw new IllegalArgumentException(String.format("Datasource %s not found", datasource), e);
} catch (SQLException e) {
throw new IllegalArgumentException(
String.format("SQLException while opening %s", datasource), e);
}
/*
* We have to wrap the connection to disallow any commit() or setAutoCommit() on it. Jena calls these
* methods without regard to the fact that the connection may be managed by an external transaction.
*/
Connection wrappedConnection =
(Connection)
Proxy.newProxyInstance(
Connection.class.getClassLoader(),
new Class[] {Connection.class},
new ConnectionFixInvocationHandler(baseConnection));
DBConnection connection = new DBConnection(wrappedConnection, databaseType);
// check if named model already exists
Model graph;
if (connection.containsModel(name)) {
ModelMaker m = ModelFactory.createModelRDBMaker(connection, ModelFactory.Convenient);
graph = m.openModel(name);
} else {
// create it
// check if other models already exist for that connection.
if (connection.getAllModelNames().hasNext()) {
// other models already exist => do not set parameters
// on driver.
if (databaseDoCompressUri != connection.getDriver().getDoCompressURI()) {
log.warn(
String.format(
"Cannot set databaseDoCompressUri attribute to %s "
+ "for model %s, other models already "
+ "exist with value %s",
databaseDoCompressUri, name, connection.getDriver().getDoCompressURI()));
}
if (databaseTransactionEnabled != connection.getDriver().getIsTransactionDb()) {
log.warn(
String.format(
"Cannot set databaseTransactionEnabled attribute to %s "
+ "for model %s, other models already "
+ "exist with value %s",
databaseTransactionEnabled, name, connection.getDriver().getIsTransactionDb()));
}
} else {
if (databaseDoCompressUri) {
connection.getDriver().setDoCompressURI(true);
}
if (databaseTransactionEnabled) {
connection.getDriver().setIsTransactionDb(true);
}
}
ModelMaker m = ModelFactory.createModelRDBMaker(connection, ModelFactory.Convenient);
graph = m.createModel(name);
}
graph.setNsPrefixes(namespaces);
// use baseConnection so that it is closed instead of the jena one
// (to let the pool handled closure).
if (baseConnection != null) {
return new GraphConnection(baseConnection, graph);
}
return new GraphConnection(connection, graph);
} else {
throw new IllegalArgumentException("Unknown backend type " + backend);
}
}
