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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
#ifndef mozilla__CryptoTask_h
#define mozilla__CryptoTask_h
#include "mozilla/Attributes.h"
#include "nsThreadUtils.h"
namespace mozilla {
/**
* Frequently we need to run a task on a background thread without blocking
* the main thread, and then call a callback on the main thread with the
* result. This class provides the framework for that. Subclasses must:
*
* (1) Override CalculateResult for the off-the-main-thread computation.
* (2) Override CallCallback() for the on-the-main-thread call of the
* callback.
*/
class CryptoTask : public Runnable {
public:
nsresult Dispatch();
protected:
CryptoTask() : Runnable("CryptoTask"), mRv(NS_ERROR_NOT_INITIALIZED) {}
virtual ~CryptoTask() = default;
/**
* Called on a background thread (never the main thread). Its result will be
* passed to CallCallback on the main thread.
*/
virtual nsresult CalculateResult() = 0;
/**
* Called on the main thread with the result from CalculateResult().
*/
virtual void CallCallback(nsresult rv) = 0;
private:
NS_IMETHOD Run() final;
nsresult mRv;
};
} // namespace mozilla
#endif // mozilla__CryptoTask_h