Implemented OwnerSettingsService::Set() method.

chrome/browser/chromeos/ownership/owner_settings_service_chromeos.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_CHROMEOS_OWNERSHIP_OWNER_SETTINGS_SERVICE_CHROMEOS_H_
 #define CHROME_BROWSER_CHROMEOS_OWNERSHIP_OWNER_SETTINGS_SERVICE_CHROMEOS_H_
 
-#include <deque>
+#include <queue>
+#include <utility>
 #include <vector>
 
 #include "base/callback_forward.h"
-#include "base/compiler_specific.h"
 #include "base/macros.h"
+#include "base/memory/linked_ptr.h"
+#include "base/observer_list.h"
 #include "chrome/browser/chromeos/settings/device_settings_service.h"
 #include "chromeos/dbus/session_manager_client.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/ownership/owner_key_util.h"
 #include "components/ownership/owner_settings_service.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class Profile;
 
 namespace ownership {
 class OwnerKeyUtil;
 }
 
 namespace chromeos {
 
-class SessionManagerOperation;
-
 // The class is a profile-keyed service which holds public/private
 // keypair corresponds to a profile. The keypair is reloaded automatically when
 // profile is created and TPM token is ready. Note that the private part of a
 // key can be loaded only for the owner.
 //
 // TODO (ygorshenin@): move write path for device settings here
 // (crbug.com/230018).
 class OwnerSettingsServiceChromeOS : public ownership::OwnerSettingsService,
                                      public content::NotificationObserver,
-                                     public SessionManagerClient::Observer {
+                                     public SessionManagerClient::Observer,
+                                     public DeviceSettingsService::Observer {
  public:
+  class Observer {
+   public:
+    virtual ~Observer() {}
+    virtual void OnSetCompleted(bool success) = 0;
+  };
+
   virtual ~OwnerSettingsServiceChromeOS();
 
   void OnTPMTokenReady(bool tpm_token_enabled);
 
   // ownership::OwnerSettingsService implementation:
-  virtual void SignAndStorePolicyAsync(
-      scoped_ptr<enterprise_management::PolicyData> policy,
-      const base::Closure& callback) override;
+  virtual bool HandlesSetting(const std::string& setting) override;
+  virtual void Set(const std::string& setting,
+                   const base::Value& value) override;
 
   // NotificationObserver implementation:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) override;
 
   // SessionManagerClient::Observer:
   virtual void OwnerKeySet(bool success) override;
 
+  // DeviceSettingsService::Observer:
+  virtual void OwnershipStatusChanged() override;
+  virtual void DeviceSettingsUpdated() override;
+
   // Checks if the user is the device owner, without the user profile having to
   // been initialized. Should be used only if login state is in safe mode.
   static void IsOwnerForSafeModeAsync(
       const std::string& user_hash,
       const scoped_refptr<ownership::OwnerKeyUtil>& owner_key_util,
       const IsOwnerCallback& callback);
 
-  static void SetDeviceSettingsServiceForTesting(
-      DeviceSettingsService* device_settings_service);
+  void AddObserver(Observer* observer);
+
+  void RemoveObserver(Observer* observer);
 
  private:
+  // Scoped lock for DeviceSettingsService processing loop.
+  class ProcessingLoopAutoBlocker;
+
   friend class OwnerSettingsServiceChromeOSFactory;
 
   OwnerSettingsServiceChromeOS(
+      DeviceSettingsService* device_settings_service,
       Profile* profile,
       const scoped_refptr<ownership::OwnerKeyUtil>& owner_key_util);
 
   // OwnerSettingsService protected interface overrides:
 
   // Reloads private key from profile's NSS slots, responds via |callback|.
   virtual void ReloadKeypairImpl(const base::Callback<
       void(const scoped_refptr<ownership::PublicKey>& public_key,
            const scoped_refptr<ownership::PrivateKey>& private_key)>& callback)
       override;
 
   // Possibly notifies DeviceSettingsService that owner's keypair is loaded.
   virtual void OnPostKeypairLoadedActions() override;
 
-  // Performs next operation in the queue.
-  void StartNextOperation();
+  // Posts task on the current thread to process next set
+  // request.
+  void ProcessNextSetRequestAsync();
 
-  // Called when sign-and-store operation completes it's work.
-  void HandleCompletedOperation(const base::Closure& callback,
-                                SessionManagerOperation* operation,
-                                DeviceSettingsService::Status status);
+  // Tries to process next set request when DeviceSettingsService is not busy
+  // with session manager operations. If it's the case, temprorary stops

[Mattias Nissler (ping if slow), 2014/10/20 12:41:30]

*temporarily

[ygorshenin1, 2014/10/22 09:20:11]

Acknowledged.

+  // DeviceSettingsService's processing loop to prevent changes in device
+  // settings, modifies current device settings and sends them for signing.
+  // When device settings are correctly signed, OnPolicyAssembledAndSigned() is
+  // called, otherwise, HandleError() is called.
+  void ProcessNextSetRequest();
+
+  // Called when current device settings are successfully signed.
+  // Runs DeviceSettingsService's processing loop and sends signed
+  // settings for storage.
+  void OnPolicyAssembledAndSigned(
+      scoped_ptr<ProcessingLoopAutoBlocker> blocker,
+      scoped_ptr<enterprise_management::PolicyFetchResponse> policy_response);
+
+  // Called by DeviceSettingsService when modified and signed device settings
+  // are stored. Notifies observers and tries to process next set request.
+  void OnSignedPolicyStored();
+
+  // Called when modified device settings wasn't successfully signed. Notifies
+  // observers and tries to process next set request.
+  void HandleError();
+
+  DeviceSettingsService* device_settings_service_;
 
   // Profile this service instance belongs to.
   Profile* profile_;
 
   // User ID this service instance belongs to.
   std::string user_id_;
 
   // Whether profile still needs to be initialized.
   bool waiting_for_profile_creation_;
 
   // Whether TPM token still needs to be initialized.
   bool waiting_for_tpm_token_;
 
-  // The queue of pending sign-and-store operations. The first operation on the
-  // queue is currently active; it gets removed and destroyed once it completes.
-  std::deque<SessionManagerOperation*> pending_operations_;
+  // A structure used to represent set request for a particular device
+  // setting.
+  struct SetRequest {
+    SetRequest(const std::string& setting, linked_ptr<base::Value> value);
+    ~SetRequest();
+
+    const std::string setting;
+    const linked_ptr<base::Value> value;
+  };
+
+  // A queue of serialized set requests, which should be processed in FIFO
+  // order.
+  std::queue<SetRequest> set_requests_;
+
+  ObserverList<Observer> observers_;
 
   content::NotificationRegistrar registrar_;
 
   base::WeakPtrFactory<OwnerSettingsServiceChromeOS> weak_factory_;
 
+  base::WeakPtrFactory<OwnerSettingsServiceChromeOS>
+      set_requests_callback_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(OwnerSettingsServiceChromeOS);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_OWNERSHIP_OWNER_SETTINGS_SERVICE_CHROMEOS_H_