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It can even store arbitrary V8 objects for you and have them persist while the asynchronous work is in progress. This class internally handles the details of creating an [`AsyncResource`][AsyncResource], and running the callback in the correct async context. To be able to identify the async resources created by this class in async-hooks, provide a `resource_name` to the constructor. It is recommended that the module name be used as a prefix to the `resource_name` to avoid collisions in the names. For more details see [`AsyncResource`][AsyncResource] documentation. The `resource_name` needs to stay valid for the lifetime of the worker instance. Definition: ```c++ class AsyncWorker { public: explicit AsyncWorker(Callback *callback_, const char* resource_name = "nan:AsyncWorker"); virtual ~AsyncWorker(); virtual void WorkComplete(); void SaveToPersistent(const char *key, const v8::Local &value); void SaveToPersistent(const v8::Local &key, const v8::Local &value); void SaveToPersistent(uint32_t index, const v8::Local &value); v8::Local GetFromPersistent(const char *key) const; v8::Local GetFromPersistent(const v8::Local &key) const; v8::Local GetFromPersistent(uint32_t index) const; virtual void Execute() = 0; uv_work_t request; virtual void Destroy(); protected: Persistent persistentHandle; Callback *callback; virtual void HandleOKCallback(); virtual void HandleErrorCallback(); void SetErrorMessage(const char *msg); const char* ErrorMessage(); }; ``` ### Nan::AsyncProgressWorkerBase & Nan::AsyncProgressWorker `Nan::AsyncProgressWorkerBase` is an _abstract_ class template that extends `Nan::AsyncWorker` and adds additional progress reporting callbacks that can be used during the asynchronous work execution to provide progress data back to JavaScript. Previously the definition of `Nan::AsyncProgressWorker` only allowed sending `const char` data. Now extending `Nan::AsyncProgressWorker` will yield an instance of the implicit `Nan::AsyncProgressWorkerBase` template with type `` for compatibility. `Nan::AsyncProgressWorkerBase` & `Nan::AsyncProgressWorker` is intended for best-effort delivery of nonessential progress messages, e.g. a progress bar. The last event sent before the main thread is woken will be delivered. Definition: ```c++ template class AsyncProgressWorkerBase : public AsyncWorker { public: explicit AsyncProgressWorkerBase(Callback *callback_, const char* resource_name = ...); virtual ~AsyncProgressWorkerBase(); void WorkProgress(); class ExecutionProgress { public: void Signal() const; void Send(const T* data, size_t count) const; }; virtual void Execute(const ExecutionProgress& progress) = 0; virtual void HandleProgressCallback(const T *data, size_t count) = 0; virtual void Destroy(); }; typedef AsyncProgressWorkerBase AsyncProgressWorker; ``` ### Nan::AsyncProgressQueueWorker `Nan::AsyncProgressQueueWorker` is an _abstract_ class template that extends `Nan::AsyncWorker` and adds additional progress reporting callbacks that can be used during the asynchronous work execution to provide progress data back to JavaScript. `Nan::AsyncProgressQueueWorker` behaves exactly the same as `Nan::AsyncProgressWorker`, except all events are queued and delivered to the main thread. Definition: ```c++ template class AsyncProgressQueueWorker : public AsyncWorker { public: explicit AsyncProgressQueueWorker(Callback *callback_, const char* resource_name = "nan:AsyncProgressQueueWorker"); virtual ~AsyncProgressQueueWorker(); void WorkProgress(); class ExecutionProgress { public: void Send(const T* data, size_t count) const; }; virtual void Execute(const ExecutionProgress& progress) = 0; virtual void HandleProgressCallback(const T *data, size_t count) = 0; virtual void Destroy(); }; ``` ### Nan::AsyncQueueWorker `Nan::AsyncQueueWorker` will run a `Nan::AsyncWorker` asynchronously via libuv. Both the `execute` and `after_work` steps are taken care of for you. Most of the logic for this is embedded in `Nan::AsyncWorker`. Definition: ```c++ void AsyncQueueWorker(AsyncWorker *); ``` [AsyncResource]: node_misc.md#api_nan_asyncresource