bool select_task(const std::string& query, CassConsistency consistency, int num_iterations) {
bool is_successful = true;
test_utils::CassStatementPtr statement(cass_statement_new(query.c_str(), 0));
cass_statement_set_consistency(statement.get(), consistency);
for (int i = 0; i < num_iterations; ++i) {
test_utils::CassFuturePtr future(cass_session_execute(session, statement.get()));
cass_future_wait(future.get());
CassError code = cass_future_error_code(future.get());
if (code != CASS_OK
&& code != CASS_ERROR_LIB_REQUEST_TIMED_OUT
&& code != CASS_ERROR_SERVER_READ_TIMEOUT) { // Timeout is okay
CassString message;
cass_future_error_message(future.get(), &message.data, &message.length);
fprintf(stderr, "Error occurred during select '%.*s'\n", static_cast<int>(message.length), message.data);
is_successful = false;
}
if (code == CASS_OK) {
test_utils::CassResultPtr result(cass_future_get_result(future.get()));
if (cass_result_row_count(result.get()) == 0) {
fprintf(stderr, "No rows returned from query\n");
is_successful = false;
}
}
}
return is_successful;
}
bool execute_insert(CassSession* session, const std::string& table_name) {
std::string query = str(boost::format("INSERT INTO %s (id, event_time, text_sample) VALUES (?, ?, ?)") % table_name);
test_utils::CassStatementPtr statement(cass_statement_new(query.c_str(), 3));
// Determine if bound parameters can be used based on C* version
if (version.major == 1) {
test_utils::CassPreparedPtr prepared = test_utils::prepare(session, query.c_str());
statement = test_utils::CassStatementPtr(cass_prepared_bind(prepared.get()));
}
boost::chrono::system_clock::time_point now(boost::chrono::system_clock::now());
boost::chrono::milliseconds event_time(boost::chrono::duration_cast<boost::chrono::milliseconds>(now.time_since_epoch()));
std::string text_sample(test_utils::string_from_time_point(now));
cass_statement_bind_uuid(statement.get(), 0, test_utils::generate_time_uuid(uuid_gen));
cass_statement_bind_int64(statement.get(), 1, event_time.count());
cass_statement_bind_string(statement.get(), 2, text_sample.c_str());
test_utils::CassFuturePtr future(cass_session_execute(session, statement.get()));
cass_future_wait(future.get());
CassError code = cass_future_error_code(future.get());
if (code != CASS_OK && code != CASS_ERROR_LIB_REQUEST_TIMED_OUT) { // Timeout is okay
CassString message;
cass_future_error_message(future.get(), &message.data, &message.length);
fprintf(stderr, "Error occurred during insert '%.*s'\n", static_cast<int>(message.length), message.data);
return false;
}
return true;
}
const CassResult* Connection::execute(CassStatement* statement)
{
this->log("debug", "Connection::execute");
CassFuture* result = cass_session_execute(this->_session, statement);
CassError error = cass_future_error_code(result);
if (error != CASS_OK) {
CassString message = cass_future_error_message(result);
cass_future_free(result);
std::ostringstream out;
out << cass_error_desc(error) << ": " << message.data;
this->log("error", out.str());
throw Php::Exception(out.str());
return nullptr;
}
const CassResult* res = cass_future_get_result(result);
if (res == nullptr) {
throw Php::Exception("Error executing query, result is null");
}
cass_future_free(result);
return res;
}
void wait_and_check_error(CassFuture* future, cass_duration_t timeout) {
CassError code = wait_and_return_error(future, timeout);
if (code != CASS_OK) {
CassString message;
cass_future_error_message(future, &message.data, &message.length);
BOOST_FAIL("Error occurred during query '" << std::string(message.data, message.length) << "' (" << boost::format("0x%08X") % code << ")");
}
}
/**
* librdf_storage_cassandra_context_add_statement:
* @storage: #librdf_storage object
* @context_node: #librdf_node object
* @statement: #librdf_statement statement to add
*
* Add a statement to a storage context.
*
* Return value: non 0 on failure
**/
static int
librdf_storage_cassandra_context_add_statement(librdf_storage* storage,
librdf_node* context_node,
librdf_statement* statement)
{
char* s;
char* p;
char* o;
char* c;
statement_helper(storage, statement, context_node, &s, &p, &o, &c);
librdf_storage_cassandra_instance* context;
context = (librdf_storage_cassandra_instance*)storage->instance;
char* query =
"BEGIN BATCH "
" INSERT INTO rdf.spo (s, p, o) VALUES (?, ?, ?);"
" INSERT INTO rdf.pos (s, p, o) VALUES (?, ?, ?);"
" INSERT INTO rdf.osp (s, p, o) VALUES (?, ?, ?);"
"APPLY BATCH;";
CassStatement* stmt = cass_statement_new(query, 9);
cass_statement_bind_string(stmt, 0, s);
cass_statement_bind_string(stmt, 1, p);
cass_statement_bind_string(stmt, 2, o);
cass_statement_bind_string(stmt, 3, s);
cass_statement_bind_string(stmt, 4, p);
cass_statement_bind_string(stmt, 5, o);
cass_statement_bind_string(stmt, 6, s);
cass_statement_bind_string(stmt, 7, p);
cass_statement_bind_string(stmt, 8, o);
if (s) free(s);
if (p) free(p);
if (o) free(o);
CassFuture* future = cass_session_execute(context->session, stmt);
cass_statement_free(stmt);
CassError rc = cass_future_error_code(future);
if (rc != CASS_OK) {
fprintf(stderr, "Cassandra: %s\n", cass_error_desc(rc));
const char* msg;
size_t msg_len;
cass_future_error_message(future, &msg, &msg_len);
fprintf(stderr, "Cassandra: %*s\n", msg_len, msg);
cass_future_free(future);
return -1;
}
cass_future_free(future);
return 0;
}
static int
cassandra_results_stream_end_of_stream(void* context)
{
cassandra_results_stream* scontext;
scontext = (cassandra_results_stream*)context;
if (scontext->at_end) {
if (scontext->more_pages) {
CassError rc;
rc = cass_statement_set_paging_state(scontext->stmt,
scontext->result);
if (rc != CASS_OK) {
fprintf(stderr, "Cassandra: %s\n", cass_error_desc(rc));
return -1;
}
cass_result_free(scontext->result);
scontext->result = 0;
CassFuture* future =
cass_session_execute(scontext->cassandra_context->session,
scontext->stmt);
rc = cass_future_error_code(future);
if (rc != CASS_OK) {
fprintf(stderr, "Cassandra: %s\n", cass_error_desc(rc));
const char* msg;
size_t msg_len;
cass_future_error_message(future, &msg, &msg_len);
fprintf(stderr, "Cassandra: %*s\n", msg_len, msg);
cass_future_free(future);
return -1;
}
scontext->result = cass_future_get_result(future);
cass_future_free(future);
scontext->iter = cass_iterator_from_result(scontext->result);
scontext->more_pages = cass_result_has_more_pages(scontext->result);
scontext->at_end = !cass_iterator_next(scontext->iter);
}
}
return (scontext->at_end);
}
bool execute_insert(CassStatement* statement) {
test_utils::CassFuturePtr future(cass_session_execute(session, statement));
cass_future_wait(future.get());
CassError code = cass_future_error_code(future.get());
if (code != CASS_OK && code != CASS_ERROR_LIB_REQUEST_TIMED_OUT) { // Timeout is okay
CassString message;
cass_future_error_message(future.get(), &message.data, &message.length);
fprintf(stderr, "Error occurred during insert '%.*s'\n", static_cast<int>(message.length), message.data);
return false;
}
return true;
}
std::string get_executing_host(test_utils::CassSessionPtr session) {
std::stringstream query;
query << "SELECT * FROM " << (version >= "3.0.0" ? "system_schema.keyspaces" : "system.schema_keyspaces");
test_utils::CassStatementPtr statement(cass_statement_new(query.str().c_str(), 0));
test_utils::CassFuturePtr future(cass_session_execute(session.get(), statement.get()));
if (cass_future_error_code(future.get()) == CASS_OK) {
return cass::get_host_from_future(future.get());
} else {
CassString message;
cass_future_error_message(future.get(), &message.data, &message.length);
std::cerr << "Failed to query host: " << std::string(message.data, message.length) << std::endl;
}
return "";
}
/**
* Create the session
*
* @param is_timeout True if for timeout tests; false otherwise
*/
void create_session(bool is_timeout = false) {
close_session();
test_utils::CassSessionPtr session(cass_session_new());
test_utils::CassFuturePtr connect_future(cass_session_connect(session.get(), cluster_.get()));
CassError error_code = test_utils::wait_and_return_error(connect_future.get());
session_ = test_utils::create_session(cluster_.get(), &error_code);
if (error_code != CASS_OK) {
if (is_timeout) {
if (error_code == CASS_ERROR_LIB_NO_HOSTS_AVAILABLE) {
return;
}
}
CassString message;
cass_future_error_message(connect_future.get(), &message.data, &message.length);
BOOST_FAIL(std::string(message.data, message.length) << "' (" << cass_error_desc(error_code) << ")");
}
}
static int
librdf_storage_cassandra_size(librdf_storage* storage)
{
librdf_storage_cassandra_instance* context;
context = (librdf_storage_cassandra_instance*)storage->instance;
char* query = "SELECT count(s) FROM rdf.spo";
CassStatement* stmt = cass_statement_new(query, 0);
CassFuture* future = cass_session_execute(context->session, stmt);
cass_statement_free(stmt);
CassError rc = cass_future_error_code(future);
if (rc != CASS_OK) {
fprintf(stderr, "Cassandra: %s\n", cass_error_desc(rc));
const char* msg;
size_t msg_len;
cass_future_error_message(future, &msg, &msg_len);
fprintf(stderr, "Cassandra: %*s\n", msg_len, msg);
cass_future_free(future);
return 0;
}
const CassResult* result = cass_future_get_result(future);
cass_future_free(future);
const CassRow* row = cass_result_first_row(result);
int64_t count;
cass_value_get_int64(cass_row_get_column(row, 0), &count);
cass_result_free(result);
return count;
}
bool client_thread(CassSession* session, const std::string table_name) {
std::string query = str(boost::format("SELECT * FROM %s LIMIT 10000") % table_name);
for (int i = 0 ; i < 10; ++i) execute_insert(session, table_name);
boost::posix_time::ptime start = boost::posix_time::second_clock::universal_time();
test_utils::CassStatementPtr statement(cass_statement_new(query.c_str(), 0));
cass_statement_set_consistency(statement.get(), CASS_CONSISTENCY_ONE);
while ((boost::posix_time::second_clock::universal_time() - start).total_seconds() < TEST_DURATION_SECS) {
test_utils::CassFuturePtr future(cass_session_execute(session, statement.get()));
cass_future_wait(future.get());
CassError code = cass_future_error_code(future.get());
if (code != CASS_OK
&& code != CASS_ERROR_LIB_REQUEST_TIMED_OUT
&& code != CASS_ERROR_SERVER_READ_TIMEOUT) { // Timeout is okay
CassString message;
cass_future_error_message(future.get(), &message.data, &message.length);
fprintf(stderr, "Error occurred during select '%.*s'\n", static_cast<int>(message.length), message.data);
is_done = true;
return false;
}
if (code == CASS_OK) {
test_utils::CassResultPtr result(cass_future_get_result(future.get()));
if (cass_result_row_count(result.get()) == 0) {
fprintf(stderr, "No rows returned from query\n");
is_done = true;
return false;
}
}
}
is_done = true;
return true;
}
void check_for_live_hosts(test_utils::CassSessionPtr session,
const std::set<std::string>& should_be_present) {
std::set<std::string> hosts;
for (size_t i = 0; i < should_be_present.size() + 1; ++i) {
const char* query = "SELECT * FROM system.schema_keyspaces";
test_utils::CassStatementPtr statement(cass_statement_new(query, 0));
test_utils::CassFuturePtr future(cass_session_execute(session.get(), statement.get()));
if (cass_future_error_code(future.get()) == CASS_OK) {
hosts.insert(cass::get_host_from_future(future.get()));
} else {
CassString message;
cass_future_error_message(future.get(), &message.data, &message.length);
BOOST_MESSAGE("Failed to query host: " << std::string(message.data, message.length));
}
}
BOOST_CHECK(hosts.size() == should_be_present.size());
for (std::set<std::string>::const_iterator it = should_be_present.begin();
it != should_be_present.end(); ++it) {
BOOST_CHECK(hosts.count(*it) > 0);
}
}
void check_for_live_hosts(test_utils::CassSessionPtr session,
const std::set<std::string>& should_be_present) {
std::set<std::string> hosts;
std::stringstream query;
query << "SELECT * FROM " << (version >= "3.0.0" ? "system_schema.keyspaces" : "system.schema_keyspaces");
for (size_t i = 0; i < should_be_present.size() + 2; ++i) {
test_utils::CassStatementPtr statement(cass_statement_new(query.str().c_str(), 0));
test_utils::CassFuturePtr future(cass_session_execute(session.get(), statement.get()));
if (cass_future_error_code(future.get()) == CASS_OK) {
hosts.insert(cass::get_host_from_future(future.get()));
} else {
CassString message;
cass_future_error_message(future.get(), &message.data, &message.length);
std::cerr << "Failed to query host: " << std::string(message.data, message.length) << std::endl;
}
}
BOOST_CHECK(hosts.size() == should_be_present.size());
for (std::set<std::string>::const_iterator it = should_be_present.begin();
it != should_be_present.end(); ++it) {
BOOST_CHECK(hosts.count(*it) > 0);
}
}
void print_error(CassFuture* future) {
const char* message;
size_t message_length;
cass_future_error_message(future, &message, &message_length);
fprintf(stderr, "Error: %.*s\n", (int)message_length, message);
}
int main(int argc, char* argv[]) {
/* Setup and connect to cluster */
CassFuture* connect_future = NULL;
CassCluster* cluster = cass_cluster_new();
CassSession* session = cass_session_new();
CassSsl* ssl = cass_ssl_new();
char* hosts = "127.0.0.1";
if (argc > 1) {
hosts = argv[1];
}
cass_cluster_set_contact_points(cluster, hosts);
/* Only verify the certification and not the identity */
cass_ssl_set_verify_flags(ssl, CASS_SSL_VERIFY_PEER_CERT);
if (!load_trusted_cert_file("cert.pem", ssl)) {
fprintf(stderr, "Failed to load certificate disabling peer verification\n");
cass_ssl_set_verify_flags(ssl, CASS_SSL_VERIFY_NONE);
}
cass_cluster_set_ssl(cluster, ssl);
connect_future = cass_session_connect(session, cluster);
if (cass_future_error_code(connect_future) == CASS_OK) {
CassFuture* close_future = NULL;
/* Build statement and execute query */
const char* query = "SELECT release_version FROM system.local";
CassStatement* statement = cass_statement_new(query, 0);
CassFuture* result_future = cass_session_execute(session, statement);
if (cass_future_error_code(result_future) == CASS_OK) {
/* Retrieve result set and get the first row */
const CassResult* result = cass_future_get_result(result_future);
const CassRow* row = cass_result_first_row(result);
if (row) {
const CassValue* value = cass_row_get_column_by_name(row, "release_version");
const char* release_version;
size_t release_version_length;
cass_value_get_string(value, &release_version, &release_version_length);
printf("release_version: '%.*s'\n", (int)release_version_length,
release_version);
}
cass_result_free(result);
} else {
/* Handle error */
const char* message;
size_t message_length;
cass_future_error_message(result_future, &message, &message_length);
fprintf(stderr, "Unable to run query: '%.*s'\n", (int)message_length,
message);
}
cass_statement_free(statement);
cass_future_free(result_future);
/* Close the session */
close_future = cass_session_close(session);
cass_future_wait(close_future);
cass_future_free(close_future);
} else {
/* Handle error */
const char* message;
size_t message_length;
cass_future_error_message(connect_future, &message, &message_length);
fprintf(stderr, "Unable to connect: '%.*s'\n", (int)message_length,
message);
}
cass_future_free(connect_future);
cass_cluster_free(cluster);
cass_session_free(session);
cass_ssl_free(ssl);
return 0;
}
void CassDriver::PrintError(CassFuture* future) {
CassString message = cass_future_error_message(future);
fprintf(stderr, "Error: %.*s\n", (int)message.length, message.data);
}
/**
* Get the error message of the future if an error occurred
*
* @return Error message
*/
const std::string error_message() {
const char* message;
size_t message_length;
cass_future_error_message(get(), &message, &message_length);
return std::string(message, message_length);
}
int main(int argc, char* argv[]) {
/* Setup and connect to cluster */
CassFuture* connect_future = NULL;
CassCluster* cluster = cass_cluster_new();
CassSession* session = cass_session_new();
char* hosts = "127.0.0.1";
if (argc > 1) {
hosts = argv[1];
}
/* Add contact points */
cass_cluster_set_contact_points(cluster, hosts);
/* Provide the cluster object as configuration to connect the session */
connect_future = cass_session_connect(session, cluster);
if (cass_future_error_code(connect_future) == CASS_OK) {
CassFuture* close_future = NULL;
/* Build statement and execute query */
const char* query = "SELECT keyspace_name "
"FROM system.schema_keyspaces;";
CassStatement* statement = cass_statement_new(query, 0);
CassFuture* result_future = cass_session_execute(session, statement);
if (cass_future_error_code(result_future) == CASS_OK) {
/* Retrieve result set and iterate over the rows */
const CassResult* result = cass_future_get_result(result_future);
CassIterator* rows = cass_iterator_from_result(result);
while (cass_iterator_next(rows)) {
const CassRow* row = cass_iterator_get_row(rows);
const CassValue* value = cass_row_get_column_by_name(row, "keyspace_name");
const char* keyspace_name;
size_t keyspace_name_length;
cass_value_get_string(value, &keyspace_name, &keyspace_name_length);
printf("keyspace_name: '%.*s'\n", (int)keyspace_name_length,
keyspace_name);
}
cass_result_free(result);
cass_iterator_free(rows);
} else {
/* Handle error */
const char* message;
size_t message_length;
cass_future_error_message(result_future, &message, &message_length);
fprintf(stderr, "Unable to run query: '%.*s'\n", (int)message_length,
message);
}
cass_statement_free(statement);
cass_future_free(result_future);
/* Close the session */
close_future = cass_session_close(session);
cass_future_wait(close_future);
cass_future_free(close_future);
} else {
/* Handle error */
const char* message;
size_t message_length;
cass_future_error_message(connect_future, &message, &message_length);
fprintf(stderr, "Unable to connect: '%.*s'\n", (int)message_length,
message);
}
cass_future_free(connect_future);
cass_cluster_free(cluster);
cass_session_free(session);
return 0;
}
static int
librdf_storage_cassandra_add_statements(librdf_storage* storage,
librdf_stream* statement_stream)
{
librdf_storage_cassandra_instance* context;
context = (librdf_storage_cassandra_instance*)storage->instance;
CassBatch* batch = 0;
const int batch_size = 10;
int rows = 0;
for(; !librdf_stream_end(statement_stream);
librdf_stream_next(statement_stream)) {
librdf_statement* statement;
librdf_node* context_node;
statement = librdf_stream_get_object(statement_stream);
context_node = librdf_stream_get_context2(statement_stream);
if(!statement) {
break;
}
char* s;
char* p;
char* o;
char* c;
statement_helper(storage, statement, context_node, &s, &p, &o, &c);
if (batch == 0)
batch = cass_batch_new(CASS_BATCH_TYPE_LOGGED);
char* query = "INSERT INTO rdf.spo (s, p, o) VALUES (?, ?, ?);";
CassStatement* stmt = cass_statement_new(query, 3);
cass_statement_bind_string(stmt, 0, s);
cass_statement_bind_string(stmt, 1, p);
cass_statement_bind_string(stmt, 2, o);
cass_batch_add_statement(batch, stmt);
cass_statement_free(stmt);
query = "INSERT INTO rdf.pos (s, p, o) VALUES (?, ?, ?);";
stmt = cass_statement_new(query, 3);
cass_statement_bind_string(stmt, 0, s);
cass_statement_bind_string(stmt, 1, p);
cass_statement_bind_string(stmt, 2, o);
cass_batch_add_statement(batch, stmt);
cass_statement_free(stmt);
query = "INSERT INTO rdf.osp (s, p, o) VALUES (?, ?, ?);";
stmt = cass_statement_new(query, 3);
cass_statement_bind_string(stmt, 0, s);
cass_statement_bind_string(stmt, 1, p);
cass_statement_bind_string(stmt, 2, o);
cass_batch_add_statement(batch, stmt);
cass_statement_free(stmt);
free(s);
free(p);
free(o);
if (++rows > batch_size) {
CassFuture* future = cass_session_execute_batch(context->session,
batch);
cass_batch_free(batch);
CassError rc = cass_future_error_code(future);
if (rc != CASS_OK) {
fprintf(stderr, "Cassandra: %s\n", cass_error_desc(rc));
const char* msg;
size_t msg_len;
cass_future_error_message(future, &msg, &msg_len);
fprintf(stderr, "Cassandra: %*s\n", msg_len, msg);
cass_future_free(future);
return -1;
}
cass_future_free(future);
batch = 0;
}
}
if (batch) {
CassFuture* future = cass_session_execute_batch(context->session,
batch);
cass_batch_free(batch);
CassError rc = cass_future_error_code(future);
if (rc != CASS_OK) {
fprintf(stderr, "Cassandra: %s\n", cass_error_desc(rc));
const char* msg;
size_t msg_len;
cass_future_error_message(future, &msg, &msg_len);
fprintf(stderr, "Cassandra: %*s\n", msg_len, msg);
cass_future_free(future);
return -1;
}
cass_future_free(future);
}
return 0;
}
static std::string getFutureError(CassFuture *future) {
const char *message;
size_t message_length;
cass_future_error_message(future, &message, &message_length);
return std::string(message, message_length);
}
/**
* librdf_storage_cassandra_find_statements:
* @storage: the storage
* @statement: the statement to match
*
* .
*
* Return a stream of statements matching the given statement (or
* all statements if NULL). Parts (subject, predicate, object) of the
* statement can be empty in which case any statement part will match that.
* Uses #librdf_statement_match to do the matching.
*
* Return value: a #librdf_stream or NULL on failure
**/
static librdf_stream*
librdf_storage_cassandra_find_statements(librdf_storage* storage,
librdf_statement* statement)
{
librdf_storage_cassandra_instance* context;
cassandra_results_stream* scontext;
librdf_stream* stream;
char* s;
char* p;
char* o;
char* c;
context = (librdf_storage_cassandra_instance*)storage->instance;
scontext =
LIBRDF_CALLOC(cassandra_results_stream*, 1, sizeof(*scontext));
if(!scontext)
return NULL;
scontext->storage = storage;
librdf_storage_add_reference(scontext->storage);
scontext->cassandra_context = context;
statement_helper(storage, statement, 0, &s, &p, &o, &c);
#ifdef DEBUG
fprintf(stderr, "Query: ");
if (s)
fprintf(stderr, "s=%s ", s);
if (p)
fprintf(stderr, "p=%s ", p);
if (o)
fprintf(stderr, "o=%s ", o);
fprintf(stderr, "\n");
#endif
typedef CassStatement* (*query_function)(const char* s, const char* p,
const char* o);
query_function functions[8] = {
&cassandra_query_, /* ??? */
&cassandra_query_s, /* S?? */
&cassandra_query_p, /* ?P? */
&cassandra_query_sp, /* SP? */
&cassandra_query_o, /* ??O */
&cassandra_query_so, /* S?O */
&cassandra_query_po, /* ?PO */
&cassandra_query_spo /* SPO */
};
/* This creates an index into the function table, depending on input
terms. */
int num = 0;
if (o) num += 4;
if (p) num += 2;
if (s) num++;
index_type tp;
query_function fn = functions[num];
CassStatement* stmt = (*fn)(s, p, o);
cass_statement_set_paging_size(stmt, 1000);
if (s) free(s);
if (p) free(p);
if (o) free(o);
CassFuture* future = cass_session_execute(context->session, stmt);
CassError rc = cass_future_error_code(future);
if (rc != CASS_OK) {
fprintf(stderr, "Cassandra: %s\n", cass_error_desc(rc));
const char* msg;
size_t msg_len;
cass_future_error_message(future, &msg, &msg_len);
fprintf(stderr, "Cassandra: %*s\n", msg_len, msg);
cass_future_free(future);
return 0;
}
const CassResult* result = cass_future_get_result(future);
cass_future_free(future);
CassIterator* iter = cass_iterator_from_result(result);
scontext->stmt = stmt;
scontext->result = result;
scontext->iter = iter;
scontext->more_pages = cass_result_has_more_pages(result);
scontext->at_end = !cass_iterator_next(scontext->iter);
stream =
librdf_new_stream(storage->world,
(void*)scontext,
&cassandra_results_stream_end_of_stream,
&cassandra_results_stream_next_statement,
&cassandra_results_stream_get_statement,
&cassandra_results_stream_finished);
if(!stream) {
cassandra_results_stream_finished((void*)scontext);
return NULL;
}
return stream;
}
