[WIP] Provided file system from NACL.

chrome/browser/chromeos/file_system_provider/file_system_plugin/plugin_service.h

+// Copyright 2015 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_FILE_SYSTEM_PROVIDER_FILE_SYSTEM_PLUGIN_PLUGIN_SERVICE_H_
+#define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_FILE_SYSTEM_PLUGIN_PLUGIN_SERVICE_H_
+
+#include "base/files/file.h"
+#include "base/files/file_path.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/observer_list.h"
+#include "base/threading/thread_checker.h"
+#include "base/values.h"
+#include "chrome/browser/chromeos/file_system_provider/file_system_plugin/provided_file_system_adapter.h"
+#include "chrome/browser/chromeos/file_system_provider/observer.h"
+#include "chrome/browser/chromeos/file_system_provider/provided_file_system_defs.h"
+#include "chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h"
+#include "chrome/browser/chromeos/file_system_provider/provided_file_system_observer.h"
+#include "chrome/browser/chromeos/file_system_provider/watcher.h"
+#include "chrome/browser/profiles/profile.h"
+#include "components/keyed_service/core/keyed_service.h"
+#include "content/public/browser/browser_context.h"
+#include "storage/browser/fileapi/watcher_manager.h"
+
+namespace chromeos {
+namespace file_system_provider {
+
+class ProvidedFileSystemInfo;
+class ProvidedFileSystemInterface;
+struct MountOptions;
+
+// Manages and registers the file system plugin provider service.
+class PluginService : public KeyedService/*,
+                      public ProvidedFileSystemObserver*/ {
+ public:
+  enum UnmountReason { UNMOUNT_REASON_USER, UNMOUNT_REASON_SHUTDOWN };
+  PluginService(Profile* profile);
+  ~PluginService() override;
+  base::File::Error MountFileSystem(
+      const std::string& source_id,
+      const MountOptions& options);
+  base::File::Error UnmountFileSystem( const std::string& source_id,
+                                       const std::string& file_system_id,
+                                       UnmountReason reason);
+
+  // Adds and removes observers.
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+  // Gets the singleton instance for the |context|.
+  static PluginService* Get(content::BrowserContext* context);
+  ProvidedFileSystemAdapter* GetProvidedFileSystemAdapter(
+      const std::string& plugin_id,
+      const std::string& file_system_id);
+  ProvidedFileSystemInterface* GetProvidedFileSystem(
+      const std::string& source_id,
+      const std::string& file_system_id);
+  // Returns a provided file system attached to the the passed
+  // |mount_point_name|. If not found, then returns NULL.
+  ProvidedFileSystemInterface* GetProvidedFileSystem(
+      const std::string& mount_point_name);
+  // Returns a list of information of all currently provided file systems. All
+  // items are copied.
+  std::vector<ProvidedFileSystemInfo> GetProvidedFileSystemInfoList();
+//  // ProvidedFileSystemInterface::Observer overrides.
+//  void OnWatcherChanged(const ProvidedFileSystemInfo& file_system_info,
+//                        const Watcher& watcher,
+//                        storage::WatcherManager::ChangeType change_type,
+//                        const ProvidedFileSystemObserver::Changes& changes,
+//                        const base::Closure& callback) override;
+//  void OnWatcherTagUpdated(const ProvidedFileSystemInfo& file_system_info,
+//                           const Watcher& watcher) override;
+//  void OnWatcherListChanged(const ProvidedFileSystemInfo& file_system_info,
+//                            const Watchers& watchers) override;
+ private:
+  base::File::Error MountFileSystemInternal(
+      const std::string& source_id,
+      const MountOptions& options,
+      MountContext context);
+  // Key is a pair of an extension id and file system id, which makes it
+  // unique among the entire service instance.
+  typedef std::pair<std::string, std::string> FileSystemKey;
+
+  typedef std::map<FileSystemKey, ProvidedFileSystemAdapter*>
+      ProvidedFileSystemMap;
+  typedef std::map<std::string, FileSystemKey> MountPointNameToKeyMap;
+
+  Profile* profile_;
+  base::ObserverList<Observer> observers_;
+  ProvidedFileSystemMap file_system_map_;  // Owns pointers.
+  MountPointNameToKeyMap mount_point_name_to_key_map_;
+  base::ThreadChecker thread_checker_;
+
+  base::WeakPtrFactory<PluginService> weak_ptr_factory_;
+  DISALLOW_COPY_AND_ASSIGN(PluginService);
+};
+
+} // namespace file_system_provider
+} // namespace chromeos
+
+#endif // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_FILE_SYSTEM_PLUGIN_PLUGIN_SERVICE_H_
+