#pragma once

#include <cstdint>

#include <memory>

#include "envoy/common/pure.h"

namespace Envoy {

/**

 * Generic interface for all backoff strategy implementations.

 */

class BackOffStrategy {

public:

  /**

   * @return the next backoff interval in milli seconds.

   */

  virtual uint64_t nextBackOffMs() PURE;

  /**

   * Resets the intervals so that the back off intervals can start again.

   */

  virtual void reset() PURE;

  /**

   * @return if the time interval exceeds any configured cap on next backoff value.

   */

  virtual bool isOverTimeLimit(uint64_t interval_ms) const PURE;

};

using BackOffStrategyPtr = std::unique_ptr<BackOffStrategy>;

} // namespace Envoy