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      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_
     58