1 files changed, 41 insertions, 0 deletions
diff --git a/chromium/components/download/database/in_progress/in_progress_cache.h b/chromium/components/download/database/in_progress/in_progress_cache.h
new file mode 100644
index 00000000000..705e37153fc
--- /dev/null
+++ b/chromium/components/download/database/in_progress/in_progress_cache.h
@@ -0,0 +1,41 @@
+// Copyright 2017 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 COMPONENTS_DOWNLOAD_DATABASE_IN_PROGRESS_IN_PROGRESS_CACHE_H_
+#define COMPONENTS_DOWNLOAD_DATABASE_IN_PROGRESS_IN_PROGRESS_CACHE_H_
+
+#include <string>
+
+#include "base/optional.h"
+#include "components/download/database/in_progress/download_entry.h"
+
+namespace download {
+
+extern const base::FilePath::CharType kDownloadMetadataStoreFilename[];
+
+// InProgressCache provides a write-through cache that persists
+// information related to an in-progress download such as request origin, retry
+// count, resumption parameters etc to the disk. The entries are written to disk
+// right away for now (might not be in the case in the long run).
+class InProgressCache {
+ public:
+  virtual ~InProgressCache() = default;
+
+  // Initializes the cache.
+  virtual void Initialize(base::OnceClosure callback) = 0;
+
+  // Adds or updates an existing entry.
+  virtual void AddOrReplaceEntry(const DownloadEntry& entry) = 0;
+
+  // Retrieves an existing entry.
+  virtual base::Optional<DownloadEntry> RetrieveEntry(
+      const std::string& guid) = 0;
+
+  // Removes an entry.
+  virtual void RemoveEntry(const std::string& guid) = 0;
+};
+
+}  // namespace download
+
+#endif  // COMPONENTS_DOWNLOAD_DATABASE_IN_PROGRESS_IN_PROGRESS_CACHE_H_