script_cached_metadata_handler.h | Explore in Territory

// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_FETCH_SCRIPT_CACHED_METADATA_HANDLER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_FETCH_SCRIPT_CACHED_METADATA_HANDLER_H_

#include <memory>

#include "third_party/blink/renderer/platform/bindings/parkable_string.h"
#include "third_party/blink/renderer/platform/loader/fetch/url_loader/cached_metadata_handler.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
#include "third_party/blink/renderer/platform/wtf/text/text_encoding.h"

namespace mojo_base {
class BigBuffer;
}

namespace blink {

class CachedMetadata;
class CachedMetadataSender;

// ScriptCachedMetadataHandler should be created when a response is received,
// and can be used independently from its Resource.
// - It doesn't have any references to the Resource. Necessary data are captured
// from the Resource when the handler is created.
// - It is not affected by Resource's revalidation on MemoryCache. The validity
// of the handler is solely checked by |response_url_| and |response_time_|
// (not by Resource) by the browser process, and the cached metadata written to
// the handler is rejected if e.g. the disk cache entry has been updated and the
// handler refers to an older response.
class PLATFORM_EXPORT ScriptCachedMetadataHandler
    : public CachedMetadataHandler { … };

// The serialized header format for cached metadata which includes a hash of the
// script text. This header is followed by a second header in the format defined
// by CachedMetadataHeader, which is in turn followed by the data.
struct CachedMetadataHeaderWithHash { … };

class PLATFORM_EXPORT ScriptCachedMetadataHandlerWithHashing final
    : public ScriptCachedMetadataHandler { … };

// Describes a few interesting states of the ScriptCachedMetadataHandler when
// GetCachedMetadata() is called. These values are written to logs. New enum
// values can be added, but existing enums must never be renumbered or deleted
// and reused.
enum class StateOnGet : int { … };

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_LOADER_FETCH_SCRIPT_CACHED_METADATA_HANDLER_H_
chromium/third_party/blink/renderer/platform/loader/fetch/script_cached_metadata_handler.h
