chrome/browser/process_singleton_startup_lock.h

   1 // Copyright 2013 The Chromium Authors
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_PROCESS_SINGLETON_STARTUP_LOCK_H_
   6 #define CHROME_BROWSER_PROCESS_SINGLETON_STARTUP_LOCK_H_
   7
   8 #include <set>
   9 #include <utility>
  10 #include <vector>
  11
  12 #include "base/command_line.h"
  13 #include "base/files/file_path.h"
  14 #include "base/sequence_checker.h"
  15 #include "chrome/browser/process_singleton.h"
  16
  17 // Provides a ProcessSingleton::NotificationCallback that can queue up
  18 // command-line invocations during startup and execute them when startup
  19 // completes.
  20 //
  21 // The object starts in a locked state. |Unlock()| must be called
  22 // when the process is prepared to handle command-line invocations.
  23 //
  24 // Once unlocked, notifications are forwarded to a wrapped NotificationCallback.
  25 class ProcessSingletonStartupLock {
  26  public:
  27   explicit ProcessSingletonStartupLock(
  28       const ProcessSingleton::NotificationCallback& original_callback);
  29
  30   ProcessSingletonStartupLock(const ProcessSingletonStartupLock&) = delete;
  31   ProcessSingletonStartupLock& operator=(const ProcessSingletonStartupLock&) =
  32       delete;
  33
  34   ~ProcessSingletonStartupLock();
  35
  36   // Returns the ProcessSingleton::NotificationCallback.
  37   // The callback is only valid during the lifetime of the
  38   // ProcessSingletonStartupLock instance.
  39   ProcessSingleton::NotificationCallback AsNotificationCallback();
  40
  41   // Executes previously queued command-line invocations and allows future
  42   // invocations to be executed immediately.
  43   void Unlock();
  44
  45   bool locked() { return locked_; }
  46
  47  private:
  48   typedef std::pair<base::CommandLine::StringVector, base::FilePath>
  49       DelayedStartupMessage;
  50
  51   bool NotificationCallbackImpl(const base::CommandLine& command_line,
  52                                 const base::FilePath& current_directory);
  53
  54   bool locked_;
  55   std::vector<DelayedStartupMessage> saved_startup_messages_;
  56   ProcessSingleton::NotificationCallback original_callback_;
  57
  58   SEQUENCE_CHECKER(sequence_checker_);
  59 };
  60
  61 #endif  // CHROME_BROWSER_PROCESS_SINGLETON_STARTUP_LOCK_H_