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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef BLIMP_COMMON_BLOB_CACHE_BLOB_CACHE_H_ | |
| 6 #define BLIMP_COMMON_BLOB_CACHE_BLOB_CACHE_H_ | |
| 7 | |
| 8 #include <string> | |
| 9 #include <vector> | |
| 10 | |
| 11 #include "base/memory/ref_counted.h" | |
| 12 #include "blimp/common/blimp_common_export.h" | |
| 13 | |
| 14 namespace blimp { | |
| 15 | |
| 16 using BlobId = std::string; | |
| 17 using BlobData = base::RefCountedData<std::string>; | |
| 18 | |
| 19 // Immutable, ref-counted representation of blob payloads, suitable for sharing | |
| 20 // across threads. | |
| 21 using BlobDataPtr = scoped_refptr<const BlobData>; | |
| 22 | |
| 23 // An interface for a cache of blobs. | |
| 24 class BLIMP_COMMON_EXPORT BlobCache { | |
| 25 public: | |
| 26 virtual ~BlobCache() {} | |
| 27 | |
| 28 // Gets the keys of items stored by the cache. | |
| 29 virtual std::vector<BlobId> GetCachedBlobIds() const = 0; | |
| 30 | |
| 31 // Returns true if there is a cache item |id|. | |
| 32 virtual bool Contains(const BlobId& id) const = 0; | |
| 33 | |
| 34 // Stores |data| with the identifier |id| in the cache. | |
| 35 // Command is ignored if there is already a cache item stored under |id|. | |
| 36 virtual void Put(const BlobId& id, BlobDataPtr data) = 0; | |
| 37 | |
| 38 // Returns a pointer to the cache item |id|, or nullptr if no cache item | |
| 39 // exists under that identifier. | |
| 40 virtual BlobDataPtr Get(const BlobId& id) const = 0; | |
| 41 }; | |
| 42 | |
| 43 } // namespace blimp | |
| 44 | |
| 45 #endif // BLIMP_COMMON_BLOB_CACHE_BLOB_CACHE_H_ | |
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