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+/*************************************************************************
+ *
+ * Copyright 2016 Realm Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ **************************************************************************/
+
+#ifndef REALM_METRICS_HPP
+#define REALM_METRICS_HPP
+
+#include <memory>
+#include <vector>
+
+#include <realm/metrics/query_info.hpp>
+#include <realm/metrics/transaction_info.hpp>
+#include <realm/util/features.h>
+
+namespace realm {
+
+class Group;
+
+namespace metrics {
+
+#if REALM_METRICS
+
+class Metrics {
+public:
+    Metrics();
+    ~Metrics() noexcept;
+    size_t num_query_metrics() const;
+    size_t num_transaction_metrics() const;
+
+    void add_query(QueryInfo info);
+    void add_transaction(TransactionInfo info);
+
+    void start_read_transaction();
+    void start_write_transaction();
+    void end_read_transaction(size_t total_size, size_t free_space, size_t num_objects, size_t num_versions);
+    void end_write_transaction(size_t total_size, size_t free_space, size_t num_objects, size_t num_versions);
+    static std::unique_ptr<MetricTimer> report_fsync_time(const Group& g);
+    static std::unique_ptr<MetricTimer> report_write_time(const Group& g);
+
+    using QueryInfoList = std::vector<QueryInfo>;
+    using TransactionInfoList = std::vector<TransactionInfo>;
+
+    // Get the list of metric objects tracked since the last take
+    std::unique_ptr<QueryInfoList> take_queries();
+    std::unique_ptr<TransactionInfoList> take_transactions();
+private:
+    std::unique_ptr<QueryInfoList> m_query_info;
+    std::unique_ptr<TransactionInfoList> m_transaction_info;
+
+    std::unique_ptr<TransactionInfo> m_pending_read;
+    std::unique_ptr<TransactionInfo> m_pending_write;
+};
+
+
+#else
+
+class Metrics
+{
+};
+
+#endif // REALM_METRICS
+
+} // namespace metrics
+} // namespace realm
+
+
+
+#endif // REALM_METRICS_HPP