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// Copyright 2015 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 CachedMetadataHandler_h
#define CachedMetadataHandler_h
#include "platform/heap/Handle.h"
#include "wtf/Forward.h"
#include <stdint.h>
namespace blink {
class CachedMetadata;
// Handler class for caching operations.
class CachedMetadataHandler
: public GarbageCollectedFinalized<CachedMetadataHandler> {
public:
enum CacheType {
SendToPlatform, // send cache data to blink::Platform::cacheMetadata
CacheLocally // cache only in Resource's member variables
};
virtual ~CachedMetadataHandler() {}
DEFINE_INLINE_VIRTUAL_TRACE() {}
// Caches the given metadata in association with this resource and suggests
// that the platform persist it. The dataTypeID is a pseudo-randomly chosen
// identifier that is used to distinguish data generated by the caller.
virtual void setCachedMetadata(uint32_t dataTypeID,
const char*,
size_t,
CacheType = SendToPlatform) = 0;
// Reset existing metadata, to allow setting new data.
virtual void clearCachedMetadata(CacheType = CacheLocally) = 0;
// Returns cached metadata of the given type associated with this resource.
// This cached metadata can be pruned at any time.
virtual PassRefPtr<CachedMetadata> cachedMetadata(
uint32_t dataTypeID) const = 0;
// Returns the encoding to which the cache is specific.
virtual String encoding() const = 0;
protected:
CachedMetadataHandler() {}
};
} // namespace blink
#endif // CachedMetadataHandler_h
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