nsUpdateSyncManager.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim:set ts=2 sw=2 sts=2 et cindent: */

/* 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 nsUpdateSyncManager_h__

#define nsUpdateSyncManager_h__

#include "mozilla/AlreadyAddRefed.h"

#include "nsIObserver.h"

#include "nsIUpdateService.h"

#include "MultiInstanceLock.h"

// The update sync manager is responsible for making sure that only one

// instance of the application is running at the time we want to start updating

// it. It does this by taking a multi-instance lock very early during the

// application's startup process. Then, when app update tasks are ready to run,

// the update service asks us whether anything else has also taken that lock,

// which, if true, would mean another instance of the application is currently

// running and performing update tasks should be avoided (the update service

// also runs a timeout and eventually goes ahead with the update in order to

// prevent an external program from effectively disabling updates).

class nsUpdateSyncManager final : public nsIUpdateSyncManager,

                                  public nsIObserver {

 public:

  explicit nsUpdateSyncManager(nsIFile* anAppFile = nullptr);

  NS_DECL_THREADSAFE_ISUPPORTS

  NS_DECL_NSIUPDATESYNCMANAGER

  NS_DECL_NSIOBSERVER

  static already_AddRefed<nsUpdateSyncManager> GetSingleton();

 private:

  ~nsUpdateSyncManager();

  nsUpdateSyncManager(nsUpdateSyncManager&) = delete;

  nsUpdateSyncManager(nsUpdateSyncManager&&) = delete;

  nsUpdateSyncManager& operator=(nsUpdateSyncManager&) = delete;

  nsUpdateSyncManager& operator=(nsUpdateSyncManager&&) = delete;

  nsresult OpenLock(nsIFile* anAppFile = nullptr);

  void ReleaseLock();

  mozilla::MultiInstLockHandle mLock = MULTI_INSTANCE_LOCK_HANDLE_ERROR;

};

#endif  // nsUpdateSyncManager_h__