chrome/browser/process_singleton_startup_lock.h

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   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/basictypes.h"
  13 #include "base/command_line.h"
  14 #include "base/files/file_path.h"
  15 #include "base/threading/non_thread_safe.h"
  16 #include "chrome/browser/process_singleton.h"
  17
  18 // Provides a ProcessSingleton::NotificationCallback that can queue up
  19 // command-line invocations during startup and execute them when startup
  20 // completes.
  21 //
  22 // The object starts in a locked state. |Unlock()| must be called
  23 // when the process is prepared to handle command-line invocations.
  24 //
  25 // Once unlocked, notifications are forwarded to a wrapped NotificationCallback.
  26 class ProcessSingletonStartupLock : public base::NonThreadSafe {
  27  public:
  28   explicit ProcessSingletonStartupLock(
  29       const ProcessSingleton::NotificationCallback& original_callback);
  30   ~ProcessSingletonStartupLock();
  31
  32   // Returns the ProcessSingleton::NotificationCallback.
  33   // The callback is only valid during the lifetime of the
  34   // ProcessSingletonStartupLock instance.
  35   ProcessSingleton::NotificationCallback AsNotificationCallback();
  36
  37   // Executes previously queued command-line invocations and allows future
  38   // invocations to be executed immediately.
  39   void Unlock();
  40
  41   bool locked() { return locked_; }
  42
  43  private:
  44   typedef std::pair<CommandLine::StringVector, base::FilePath>
  45       DelayedStartupMessage;
  46
  47   bool NotificationCallbackImpl(const CommandLine& command_line,
  48                                 const base::FilePath& current_directory);
  49
  50   bool locked_;
  51   std::vector<DelayedStartupMessage> saved_startup_messages_;
  52   ProcessSingleton::NotificationCallback original_callback_;
  53
  54   DISALLOW_COPY_AND_ASSIGN(ProcessSingletonStartupLock);
  55 };
  56
  57 #endif  // CHROME_BROWSER_PROCESS_SINGLETON_STARTUP_LOCK_H_