Initial version of Blimp BlobCache.

blimp/common/blob_cache/blob_cache.h

Index: blimp/common/blob_cache/blob_cache.h
diff --git a/blimp/common/blob_cache/blob_cache.h b/blimp/common/blob_cache/blob_cache.h
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+// Copyright 2016 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 BLIMP_COMMON_BLOB_CACHE_BLOB_CACHE_H_
+#define BLIMP_COMMON_BLOB_CACHE_BLOB_CACHE_H_
+
+#include <string>
+#include <vector>
+
+#include "base/memory/ref_counted.h"
+#include "blimp/common/blimp_common_export.h"
+
+namespace blimp {
+
+using RefCountedVector = base::RefCountedData<std::vector<uint8_t>>;
+
+// An interface for a cache of blobs.
+class BLIMP_COMMON_EXPORT BlobCache {
+ public:
+  virtual ~BlobCache() {}
+
+  // Returns true if there is a cache item |id|.
+  virtual bool Contains(const std::string& id) const = 0;
+
+  // Stores |data| with the identifier |id| in the cache.
+  // Command is ignored if there is already a cache item stored under |id|.
+  virtual void Put(const std::string& id,
+                   scoped_refptr<RefCountedVector> data) = 0;
+
+  // Returns a pointer to the cache item |id|, or nullptr if no cache item
+  // exists under that identifier.
+  virtual scoped_refptr<RefCountedVector> Get(const std::string& id) const = 0;
+};
+
+}  // namespace blimp
+
+#endif  // BLIMP_COMMON_BLOB_CACHE_BLOB_CACHE_H_