#pragma once

#include "envoy/event/dispatcher.h"

#include "envoy/server/overload/overload_manager.h"

#include "envoy/stats/scope.h"

#include "envoy/stats/stats.h"

namespace Envoy {

namespace Memory {

/**

 * A utility class to periodically attempt to shrink the heap by releasing free memory

 * to the system if the "shrink heap" overload action has been configured and triggered.

 */

class HeapShrinker {

public:

  HeapShrinker(Event::Dispatcher& dispatcher, Server::OverloadManager& overload_manager,

               Envoy::Stats::Scope& stats);

private:

  void shrinkHeap();

  bool active_{false};

  Envoy::Stats::Counter* shrink_counter_;

  Envoy::Event::TimerPtr timer_;

};

} // namespace Memory

} // namespace Envoy