bb5dcea98e
Summary: We want to sample the file I/O issued by RocksDB and report the function calls. This requires us to include the file paths otherwise it's hard to tell what has been going on. Pull Request resolved: https://github.com/facebook/rocksdb/pull/4039 Differential Revision: D8670178 Pulled By: riversand963 fbshipit-source-id: 97ee806d1c583a2983e28e213ee764dc6ac28f7a
54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
// 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).
|
|
|
|
#pragma once
|
|
#include "rocksdb/types.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
// Callback class that control GC of duplicate keys in flush/compaction
|
|
class SnapshotChecker {
|
|
public:
|
|
virtual ~SnapshotChecker() {}
|
|
virtual bool IsInSnapshot(SequenceNumber sequence,
|
|
SequenceNumber snapshot_sequence) const = 0;
|
|
};
|
|
|
|
class DisableGCSnapshotChecker : public SnapshotChecker {
|
|
public:
|
|
virtual ~DisableGCSnapshotChecker() {}
|
|
virtual bool IsInSnapshot(
|
|
SequenceNumber /*sequence*/,
|
|
SequenceNumber /*snapshot_sequence*/) const override {
|
|
// By returning false, we prevent all the values from being GCed
|
|
return false;
|
|
}
|
|
static DisableGCSnapshotChecker* Instance() { return &instance_; }
|
|
|
|
protected:
|
|
static DisableGCSnapshotChecker instance_;
|
|
explicit DisableGCSnapshotChecker() {}
|
|
};
|
|
|
|
class WritePreparedTxnDB;
|
|
|
|
// Callback class created by WritePreparedTxnDB to check if a key
|
|
// is visible by a snapshot.
|
|
class WritePreparedSnapshotChecker : public SnapshotChecker {
|
|
public:
|
|
explicit WritePreparedSnapshotChecker(WritePreparedTxnDB* txn_db);
|
|
virtual ~WritePreparedSnapshotChecker() {}
|
|
|
|
virtual bool IsInSnapshot(SequenceNumber sequence,
|
|
SequenceNumber snapshot_sequence) const override;
|
|
|
|
private:
|
|
#ifndef ROCKSDB_LITE
|
|
const WritePreparedTxnDB* const txn_db_;
|
|
#endif // !ROCKSDB_LITE
|
|
};
|
|
|
|
} // namespace rocksdb
|