// Copyright 2021 The Dawn Authors
//
// 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 DAWNNATIVE_CALLBACK_TASK_MANAGER_H_
#define DAWNNATIVE_CALLBACK_TASK_MANAGER_H_

#include <memory>
#include <mutex>
#include <vector>

namespace dawn_native {

    class CallbackTaskManager;

    struct CallbackTask {
      public:
        virtual ~CallbackTask() = default;
        virtual void Finish() = 0;
        virtual void HandleShutDown() = 0;
        virtual void HandleDeviceLoss() = 0;
    };

    class CallbackTaskManager {
      public:
        void AddCallbackTask(std::unique_ptr<CallbackTask> callbackTask);
        bool IsEmpty();
        std::vector<std::unique_ptr<CallbackTask>> AcquireCallbackTasks();

      private:
        std::mutex mCallbackTaskQueueMutex;
        std::vector<std::unique_ptr<CallbackTask>> mCallbackTaskQueue;
    };

}  // namespace dawn_native

#endif