/** Check timestamp and make checkpoint if timestamp is large enough.
* @returns error code and flag that indicates whether or not new checkpoint is created
*/
std::tuple<aku_Status, int> Sequencer::check_timestamp_(aku_Timestamp ts) {
aku_Status error_code = AKU_SUCCESS;
if (ts < top_timestamp_) {
auto delta = top_timestamp_ - ts;
if (delta > window_size_) {
error_code = AKU_ELATE_WRITE;
}
return make_tuple(error_code, 0);
}
auto point = get_checkpoint_(ts);
int flag = 0;
if (point > checkpoint_) {
// Create new checkpoint
flag = make_checkpoint_(point);
}
top_timestamp_ = ts;
return make_tuple(error_code, flag);
}
Sequencer::Sequencer(PageHeader const* page, const aku_FineTuneParams &config)
: window_size_(config.window_size)
, page_(page)
, top_timestamp_()
, checkpoint_(0u)
, sequence_number_ {0}
, run_locks_(RUN_LOCK_FLAGS_SIZE)
, c_threshold_(config.compression_threshold)
{
key_.reset(new SortedRun());
key_->push_back(TimeSeriesValue());
if (page) {
auto cnt = page->get_entries_count();
if (cnt != 0) {
auto ts = page->read_timestamp_at(cnt - 1);
checkpoint_ = get_checkpoint_(ts);
top_timestamp_ = get_timestamp_(ts);
}
}
}
/** Check timestamp and make checkpoint if timestamp is large enough.
* @returns error code and flag that indicates whether or not new checkpoint is created
*/
std::tuple<int, int> Sequencer::check_timestamp_(aku_Timestamp ts) {
int error_code = AKU_SUCCESS;
if (ts < top_timestamp_) {
auto delta = top_timestamp_ - ts;
if (delta > window_size_) {
error_code = AKU_ELATE_WRITE;
}
return make_tuple(error_code, 0);
}
auto point = get_checkpoint_(ts);
int flag = 0;
if (point > checkpoint_) {
// Create new checkpoint
flag = make_checkpoint_(point);
if (flag % 2 == 0) {
// Previous checkpoint not completed
error_code = AKU_EBUSY;
}
}
top_timestamp_ = ts;
return make_tuple(error_code, flag);
}
