Index: storage/browser/blob/shareable_blob_data_item.h |
diff --git a/storage/browser/blob/shareable_blob_data_item.h b/storage/browser/blob/shareable_blob_data_item.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..8df83895e40c1bc21def32c0d0dbd694682478d5 |
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+++ b/storage/browser/blob/shareable_blob_data_item.h |
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+// 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 STORAGE_BROWSER_BLOB_SHAREABLE_BLOB_DATA_ITEM_H_ |
+#define STORAGE_BROWSER_BLOB_SHAREABLE_BLOB_DATA_ITEM_H_ |
+ |
+#include "base/containers/hash_tables.h" |
+#include "base/hash.h" |
+#include "base/macros.h" |
+#include "base/memory/ref_counted.h" |
+#include "storage/common/data_element.h" |
+ |
+namespace storage { |
+ |
+class BlobDataItem; |
+ |
+// This class allows blob items to be shared between blobs, and is only used by |
+// BlobStorageContext. This class contains both the blob data item and the uuids |
+// of all the blobs using this item. |
+// The data in this class (the item) is immutable, but the item itself can be |
+// swapped out with an item with the same data but a different backing (think |
+// RAM vs file backed). |
+class ShareableBlobDataItem : public base::RefCounted<ShareableBlobDataItem> { |
+ public: |
+ ShareableBlobDataItem(const std::string& blob_uuid, |
+ const scoped_refptr<BlobDataItem>& item); |
+ |
+ const scoped_refptr<BlobDataItem>& item(); |
+ |
+ base::hash_set<std::string>& referencing_blobs() { |
+ return referencing_blobs_; |
+ } |
+ |
+ private: |
+ friend class base::RefCounted<ShareableBlobDataItem>; |
+ ~ShareableBlobDataItem(); |
+ |
+ scoped_refptr<BlobDataItem> item_; |
+ |
+ base::hash_set<std::string> referencing_blobs_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(ShareableBlobDataItem); |
+}; |
+ |
+} // namespace storage |
+#endif // STORAGE_BROWSER_BLOB_SHAREABLE_BLOB_DATA_ITEM_H_ |