third_party/WebKit/Source/core/fetch/CachedMetadataHandler.h

   1 // Copyright 2015 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 CachedMetadataHandler_h
   6 #define CachedMetadataHandler_h
   7
   8 #include "wtf/Forward.h"
   9
  10 namespace blink {
  11
  12 class CachedMetadata;
  13
  14 // Handler class for caching operations.
  15 class CachedMetadataHandler {
  16 public:
  17     enum CacheType {
  18         SendToPlatform, // send cache data to blink::Platform::cacheMetadata
  19         CacheLocally // cache only in Resource's member variables
  20     };
  21     virtual ~CachedMetadataHandler() { }
  22     // Caches the given metadata in association with this resource and suggests
  23     // that the platform persist it. The dataTypeID is a pseudo-randomly chosen
  24     // identifier that is used to distinguish data generated by the caller.
  25     virtual void setCachedMetadata(unsigned dataTypeID, const char*, size_t, CacheType = SendToPlatform) = 0;
  26     // Reset existing metadata, to allow setting new data.
  27     virtual void clearCachedMetadata(CacheType = CacheLocally) = 0;
  28     // Returns cached metadata of the given type associated with this resource.
  29     virtual CachedMetadata* cachedMetadata(unsigned dataTypeID) const = 0;
  30     // Returns the encoding to which the cache is specific.
  31     virtual String encoding() const = 0;
  32
  33 protected:
  34     CachedMetadataHandler() { }
  35 };
  36 }
  37
  38 #endif // CachedMetadataHandler_h