Isolated FS for media devices.

webkit/fileapi/media/media_device_map_service.cc

Index: webkit/fileapi/media/media_device_map_service.cc
diff --git a/webkit/fileapi/media/media_device_map_service.cc b/webkit/fileapi/media/media_device_map_service.cc
new file mode 100644
index 0000000000000000000000000000000000000000..06cd426f30baf99f41da6f9c42c862d89dfff0de
--- /dev/null
+++ b/webkit/fileapi/media/media_device_map_service.cc
@@ -0,0 +1,54 @@
+// 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 "base/message_loop.h"
+
+namespace fileapi {
+
+using base::SequencedTaskRunner;
+
+// static
+MediaDeviceMapService* MediaDeviceMapService::GetInstance() {
+  return Singleton<MediaDeviceMapService>::get();
+}
+
+void MediaDeviceMapService::MaybeAddMediaDevice(
+    const FilePath::StringType& device_id,
+    SequencedTaskRunner* media_task_runner) {
+  DCHECK(media_task_runner);
+
+  base::AutoLock lock(media_device_map_lock_);
+  MediaDeviceMap::const_iterator it = media_device_map_.find(device_id);
+  if (it == media_device_map_.end()) {
+    media_device_map_.insert(std::make_pair(
+        device_id, new MediaDeviceInterfaceImpl(device_id, media_task_runner)));
+  }
+}
+
+void MediaDeviceMapService::RemoveMediaDevice(
+    const FilePath::StringType& device_id) {
+  base::AutoLock lock(media_device_map_lock_);
+  MediaDeviceMap::iterator it = media_device_map_.find(device_id);
+  if (it != media_device_map_.end())
+    media_device_map_.erase(it);
+}
+
+MediaDeviceInterfaceImpl* MediaDeviceMapService::GetMediaDevice(
+    const FilePath::StringType& device_id) {
+  base::AutoLock lock(media_device_map_lock_);
+  MediaDeviceMap::iterator it = media_device_map_.find(device_id);

[Lei Zhang, 2012/07/31 20:48:18]

nit: this can be a const_iterator

[kmadhusu, 2012/08/01 01:43:59]

Done.

+  return it == media_device_map_.end() ? NULL : it->second.get();
+}
+
+MediaDeviceMapService::MediaDeviceMapService() {
+}
+
+MediaDeviceMapService::~MediaDeviceMapService() {
+}
+
+}  // namespace fileapi