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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#include "db/snapshot_checker.h"
#ifdef ROCKSDB_LITE
#include <assert.h>
#endif // ROCKSDB_LITE
#include "port/lang.h"
#include "utilities/transactions/write_prepared_txn_db.h"
namespace ROCKSDB_NAMESPACE {
#ifdef ROCKSDB_LITE
WritePreparedSnapshotChecker::WritePreparedSnapshotChecker(
WritePreparedTxnDB* /*txn_db*/) {}
SnapshotCheckerResult WritePreparedSnapshotChecker::CheckInSnapshot(
SequenceNumber /*sequence*/, SequenceNumber /*snapshot_sequence*/) const {
// Should never be called in LITE mode.
assert(false);
return SnapshotCheckerResult::kInSnapshot;
}
#else
WritePreparedSnapshotChecker::WritePreparedSnapshotChecker(
WritePreparedTxnDB* txn_db)
: txn_db_(txn_db){};
SnapshotCheckerResult WritePreparedSnapshotChecker::CheckInSnapshot(
SequenceNumber sequence, SequenceNumber snapshot_sequence) const {
bool snapshot_released = false;
// TODO(myabandeh): set min_uncommitted
bool in_snapshot = txn_db_->IsInSnapshot(
sequence, snapshot_sequence, kMinUnCommittedSeq, &snapshot_released);
if (snapshot_released) {
return SnapshotCheckerResult::kSnapshotReleased;
}
return in_snapshot ? SnapshotCheckerResult::kInSnapshot
: SnapshotCheckerResult::kNotInSnapshot;
}
#endif // ROCKSDB_LITE
DisableGCSnapshotChecker* DisableGCSnapshotChecker::Instance() {
STATIC_AVOID_DESTRUCTION(DisableGCSnapshotChecker, instance);
return &instance;
}
} // namespace ROCKSDB_NAMESPACE
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