1 files changed, 49 insertions, 0 deletions
diff --git a/src/rocksdb/include/rocksdb/stats_history.h b/src/rocksdb/include/rocksdb/stats_history.h
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+++ b/src/rocksdb/include/rocksdb/stats_history.h
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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).
+// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+#pragma once
+
+#include <map>
+#include <string>
+
+// #include "db/db_impl.h"
+#include "rocksdb/statistics.h"
+#include "rocksdb/status.h"
+
+namespace rocksdb {
+
+class DBImpl;
+
+class StatsHistoryIterator {
+ public:
+  StatsHistoryIterator() {}
+  virtual ~StatsHistoryIterator() {}
+
+  virtual bool Valid() const = 0;
+
+  // Moves to the next stats history record.  After this call, Valid() is
+  // true iff the iterator was not positioned at the last entry in the source.
+  // REQUIRES: Valid()
+  virtual void Next() = 0;
+
+  // Return the time stamp (in microseconds) when stats history is recorded.
+  // REQUIRES: Valid()
+  virtual uint64_t GetStatsTime() const = 0;
+
+  // Return the current stats history as an std::map which specifies the
+  // mapping from stats name to stats value . The underlying storage
+  // for the returned map is valid only until the next modification of
+  // the iterator.
+  // REQUIRES: Valid()
+  virtual const std::map<std::string, uint64_t>& GetStatsMap() const = 0;
+
+  // If an error has occurred, return it.  Else return an ok status.
+  virtual Status status() const = 0;
+};
+
+}  // namespace rocksdb