void Session::broadcast_keyspace_change(const std::string& keyspace,
const IOWorker* calling_io_worker) {
// This can run on an IO worker thread. This is thread-safe because the IO workers
// vector never changes after initialization and IOWorker::set_keyspace() uses
// a lock. This also means that calling "USE <keyspace>" frequently is an
// anti-pattern.
for (IOWorkerVec::iterator it = io_workers_.begin(),
end = io_workers_.end(); it != end; ++it) {
if (*it == calling_io_worker) continue;
(*it)->set_keyspace(keyspace);
}
set_keyspace(keyspace);
}
Statement::Statement(const Prepared* prepared)
: RoutableRequest(CQL_OPCODE_EXECUTE)
, AbstractData(prepared->result()->column_count())
, query_or_id_(sizeof(uint16_t) + prepared->id().size())
, flags_(0)
, page_size_(-1) {
// <id> [short bytes] (or [string])
const std::string& id = prepared->id();
query_or_id_.encode_string(0, id.data(), id.size());
// Inherit settings and keyspace from the prepared statement
set_settings(prepared->request_settings());
// If the keyspace wasn't explictly set then attempt to set it using the
// prepared statement's result metadata.
if (keyspace().empty()) {
set_keyspace(prepared->result()->keyspace().to_string());
}
}
void IOWorker::broadcast_keyspace_change(const std::string& keyspace) {
set_keyspace(keyspace);
session_->broadcast_keyspace_change(keyspace, this);
}