rocksdb/db/flush_scheduler.cc

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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
#include "db/flush_scheduler.h"
#include <cassert>
#include "db/column_family.h"
namespace rocksdb {
void FlushScheduler::ScheduleFlush(ColumnFamilyData* cfd) {
#ifndef NDEBUG
assert(column_families_set_.find(cfd) == column_families_set_.end());
column_families_set_.insert(cfd);
#endif // NDEBUG
cfd->Ref();
column_families_.push_back(cfd);
}
ColumnFamilyData* FlushScheduler::GetNextColumnFamily() {
ColumnFamilyData* cfd = nullptr;
while (column_families_.size() > 0) {
cfd = column_families_.front();
column_families_.pop_front();
if (cfd->IsDropped()) {
if (cfd->Unref()) {
delete cfd;
}
} else {
break;
}
}
#ifndef NDEBUG
if (cfd != nullptr) {
auto itr = column_families_set_.find(cfd);
assert(itr != column_families_set_.end());
column_families_set_.erase(itr);
}
#endif // NDEBUG
return cfd;
}
bool FlushScheduler::Empty() { return column_families_.empty(); }
void FlushScheduler::Clear() {
for (auto cfd : column_families_) {
#ifndef NDEBUG
auto itr = column_families_set_.find(cfd);
assert(itr != column_families_set_.end());
column_families_set_.erase(itr);
#endif // NDEBUG
if (cfd->Unref()) {
delete cfd;
}
}
column_families_.clear();
}
} // namespace rocksdb