#pragma once

#include <cstdint>

#include "envoy/common/pure.h"

#include "absl/types/optional.h"

#pragma once

namespace Envoy {

/**

 * A handle for use by any resource managers.

 */

class ResourceLimit {

public:

  /**

   * @return true if the resource can be created.

   */

  virtual bool canCreate() PURE;

  /**

   * Increment the resource count.

   */

  virtual void inc() PURE;

  /**

   * Decrement the resource count.

   */

  virtual void dec() PURE;

  /**

   * Decrement the resource count by a specific amount.

   */

  virtual void decBy(uint64_t amount) PURE;

  /**

   * @return the current maximum allowed number of this resource.

   */

  virtual uint64_t max() PURE;

  /**

   * @return the current resource count.

   */

  virtual uint64_t count() const PURE;

};

using ResourceLimitOptRef = absl::optional<std::reference_wrapper<ResourceLimit>>;

} // namespace Envoy