private ModelAndView startTransaction(
Repository repository, HttpServletRequest request, HttpServletResponse response)
throws IOException, ClientHTTPException, ServerHTTPException {
ProtocolUtil.logRequestParameters(request);
Map<String, Object> model = new HashMap<String, Object>();
IsolationLevel isolationLevel = null;
final String isolationLevelString = request.getParameter(Protocol.ISOLATION_LEVEL_PARAM_NAME);
if (isolationLevelString != null) {
final IRI level = SimpleValueFactory.getInstance().createIRI(isolationLevelString);
// FIXME this needs to be adapted to accommodate custom isolation levels
// from third party stores.
for (IsolationLevel standardLevel : IsolationLevels.values()) {
if (standardLevel.getURI().equals(level)) {
isolationLevel = standardLevel;
break;
}
}
}
try {
Transaction txn = new Transaction(repository);
txn.begin(isolationLevel);
UUID txnId = txn.getID();
ActiveTransactionRegistry.INSTANCE.register(txn);
model.put(SimpleResponseView.SC_KEY, SC_CREATED);
final StringBuffer txnURL = request.getRequestURL();
txnURL.append("/" + txnId.toString());
Map<String, String> customHeaders = new HashMap<String, String>();
customHeaders.put("Location", txnURL.toString());
model.put(SimpleResponseView.CUSTOM_HEADERS_KEY, customHeaders);
return new ModelAndView(SimpleResponseView.getInstance(), model);
} catch (RepositoryException | InterruptedException | ExecutionException e) {
throw new ServerHTTPException("Transaction start error: " + e.getMessage(), e);
}
}
