Initial version of Blimp BlobCache.

blimp/common/blob_cache/in_memory_blob_cache.h

Index: blimp/common/blob_cache/in_memory_blob_cache.h
diff --git a/blimp/common/blob_cache/in_memory_blob_cache.h b/blimp/common/blob_cache/in_memory_blob_cache.h
new file mode 100644
index 0000000000000000000000000000000000000000..9e7107b6d61131093c6c8294e3aac6311540f23e
--- /dev/null
+++ b/blimp/common/blob_cache/in_memory_blob_cache.h
@@ -0,0 +1,40 @@
+// 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_IN_MEMORY_BLOB_CACHE_H_
+#define BLIMP_COMMON_BLOB_CACHE_IN_MEMORY_BLOB_CACHE_H_
+
+#include <map>
+#include <string>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "blimp/common/blimp_common_export.h"
+#include "blimp/common/blob_cache/blob_cache.h"
+
+namespace blimp {
+
+// InMemoryBlobCache provides an in-memory implementation of BlobCache that
+// never evicts items.
+class BLIMP_COMMON_EXPORT InMemoryBlobCache : public BlobCache {
+ public:
+  InMemoryBlobCache();
+  ~InMemoryBlobCache() override;
+
+  // BlobCache implementation.
+  bool Contains(const std::string& id) const override;
+  void Put(const std::string& id,
+           scoped_refptr<RefCountedVector> data) override;
+  scoped_refptr<RefCountedVector> Get(const std::string& id) const override;
+
+ private:
+  typedef std::map<std::string, scoped_refptr<RefCountedVector>> Cache;

[Kevin M, 2016/04/15 17:28:51]

The typedef is kind of unnecessary here, since you don't reference this name
anywhere else. What about renaming "map_" as "cache_" to make it clear that the
map represents the cache?

[nyquist, 2016/04/16 00:25:29]

Done.

+  Cache map_;
+
+  DISALLOW_COPY_AND_ASSIGN(InMemoryBlobCache);
+};
+
+}  // namespace blimp
+
+#endif  // BLIMP_COMMON_BLOB_CACHE_IN_MEMORY_BLOB_CACHE_H_