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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,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#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:
  template <size_t LEN>
  nsresult Dispatch(const char (&taskThreadName)[LEN])
  {
    static_assert(LEN <= 15,
                  "Thread name must be no more than 15 characters");
    return Dispatch(nsDependentCString(taskThreadName, LEN - 1));
  }

  nsresult Dispatch(const nsACString& taskThreadName);

protected:
  CryptoTask()
    : Runnable("CryptoTask")
    , mRv(NS_ERROR_NOT_INITIALIZED)
  {
  }

  virtual ~CryptoTask() {}

  /**
   * 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;
  nsCOMPtr<nsIThread> mThread;
};

} // namespace mozilla

#endif // mozilla__CryptoTask_h