/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * 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 THRIFT_TEST_LOADGEN_QPSSCOREBOARD_H_
#define THRIFT_TEST_LOADGEN_QPSSCOREBOARD_H_ 1

#include <thrift/lib/cpp/test/loadgen/ScoreBoard.h>
#include <thrift/lib/cpp/test/loadgen/ScoreBoardOpVector.h>

namespace apache {
namespace thrift {
namespace loadgen {

/**
 * A ScoreBoard that tracks number of queries per second.
 *
 * This is a very simple scoreboard, that adds very little overhead.
 */
class QpsScoreBoard : public ScoreBoard {
 public:
  QpsScoreBoard(uint32_t numOpsHint) : opData_(numOpsHint) {}

  void opStarted(uint32_t opType) override;
  void opSucceeded(uint32_t opType) override;
  void opFailed(uint32_t opType) override;

  /**
   * Get the number of operations performed for a specific operation type.
   */
  uint64_t getCount(uint32_t opType) const;

  /**
   * Compute the total number of operations performed, for all operation types.
   */
  uint64_t computeTotalCount() const;

  /**
   * Zero out the statistics.
   */
  void zero();

  /**
   * Add the counters from another scoreboard to this one.
   */
  void accumulate(const QpsScoreBoard* other);

 private:
  struct OpData {
    OpData() : count(0) {}

    void zero() { count = 0; }

    void accumulate(const OpData* other) { count += other->count; }

    uint64_t count;
  };

  ScoreBoardOpVector<OpData> opData_;
};

} // namespace loadgen
} // namespace thrift
} // namespace apache

#endif // THRIFT_TEST_LOADGEN_QPSSCOREBOARD_H_