Isolated FS for media devices.

webkit/fileapi/media/media_device_map_service.cc

+// Copyright (c) 2012 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.
+
+#include "webkit/fileapi/media/media_device_map_service.h"
+
+#include <utility>
+
+#include "webkit/fileapi/isolated_context.h"
+
+namespace fileapi {
+
+using base::SequencedTaskRunner;
+
+namespace {
+
+IsolatedContext* isolated_context() {
+  return IsolatedContext::GetInstance();
+}
+
+FilePath::StringType GetMediaDeviceLocation(const std::string& filesystem_id) {
+  FilePath root_path;
+  if (!isolated_context()->GetRegisteredPath(filesystem_id, &root_path))
+    NOTREACHED();

[kinuko, 2012/08/02 04:27:05]

Please remove this NOTREACHED(), this could return false if the filesystem id
has been already revoked.  Also maybe we don't need this function since this is
called only from one place?

[kmadhusu, 2012/08/02 16:59:03]

Fixed and removed the helper functions.

+  return root_path.value();
+}
+
+}  // namespace
+
+// static
+MediaDeviceMapService* MediaDeviceMapService::GetInstance() {
+  return Singleton<MediaDeviceMapService>::get();
+}
+
+MediaDeviceInterfaceImpl* MediaDeviceMapService::CreateOrGetMediaDevice(
+    const std::string& filesystem_id,
+    SequencedTaskRunner* media_task_runner) {
+  DCHECK(media_task_runner);
+
+  base::AutoLock lock(media_device_map_lock_);
+  FilePath::StringType device_location = GetMediaDeviceLocation(filesystem_id);
+  if (device_location.empty())
+    return NULL;
+
+  MediaDeviceMap::const_iterator it = media_device_map_.find(device_location);
+  if (it == media_device_map_.end()) {
+    media_device_map_.insert(std::make_pair(
+        device_location, new MediaDeviceInterfaceImpl(device_location,
+                                                  media_task_runner)));

[kinuko, 2012/08/02 04:27:05]

nit: weird indentation

[kmadhusu, 2012/08/02 16:59:03]

Done.

+  }
+  return media_device_map_[device_location].get();
+}
+
+void MediaDeviceMapService::RemoveMediaDevice(
+    const std::string& device_location) {
+  base::AutoLock lock(media_device_map_lock_);
+  MediaDeviceMap::iterator it = media_device_map_.find(device_location);
+  if (it != media_device_map_.end())
+    media_device_map_.erase(it);
+}
+
+MediaDeviceMapService::MediaDeviceMapService() {
+}
+
+MediaDeviceMapService::~MediaDeviceMapService() {
+}
+
+}  // namespace fileapi