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ICache will eventually replace the existing cache access functions on FDerivedDataCacheInterface. The notable differences relative to the existing interface are: - It is asynchronous with completion callbacks by default, and allows waiting when necessary. - It allows batch requests containing multiple cache records by default. - It uses a structured cache key made up of a bucket name and a hash. - It supports prioritization and cancellation of requests. - It supports structured cache records with metadata. - It supports attachments to allow multi-part cache records. - It uses a typed request object instead of an opaque integer handle. - It provides cache policy flags to control how to query and store cache records, and which parts of a cache record to fetch. This initial implementation of ICache is totally synchronous and uses the existing cache backends for storage. #rb Zousar.Shaker [CL 15152247 by Devin Doucette in ue5-main branch]
83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "CoreTypes.h"
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#include "DerivedDataCacheKey.h"
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#include "Memory/SharedBuffer.h"
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#include "Serialization/CompactBinary.h"
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#include "Serialization/CompactBinaryPackage.h"
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#define UE_API DERIVEDDATACACHE_API
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namespace UE
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{
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namespace DerivedData
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{
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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/** The type of value stored in a cache record. */
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enum class ECacheRecordType : uint8
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{
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None,
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Binary,
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Object,
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Package,
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};
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* A cache record is a key, metadata, and a value.
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*
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* The value may be one of binary, object, or package.
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*/
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class FCacheRecord
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{
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public:
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/** Construct an empty cache record. */
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UE_API FCacheRecord();
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/** Reset to an empty record. */
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UE_API void Reset();
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inline const FCacheKey& GetKey() const { return Key; }
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inline void SetKey(const FCacheKey& InKey) { Key = InKey; }
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inline const FCbObjectRef& GetMeta() const { return Meta; }
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inline void SetMeta(FCbObjectRef InMeta) { Meta = MoveTemp(InMeta); }
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inline ECacheRecordType GetType() const { return Type; }
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/** Access the value as binary. Returns a null buffer if not binary. */
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inline const FSharedBuffer& AsBinary() const { return Binary; }
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/** Access the value as an object. Returns an empty object if not an object. */
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inline const FCbObjectRef& AsObject() const { return Object; }
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/** Access the value as a package. Returns a null package if not a package. */
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inline const FCbPackage& AsPackage() const { return Package; }
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/** Set the value as binary. Removes any existing value of another type. */
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UE_API void SetBinary(FSharedBuffer Value);
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/** Set the value as an object. Removes any existing value of another type. */
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UE_API void SetObject(FCbObjectRef Value);
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/** Set the value as a package. Removes any existing value of another type. */
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UE_API void SetPackage(FCbPackage Value);
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private:
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FCacheKey Key;
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FCbObjectRef Meta;
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FSharedBuffer Binary;
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FCbObjectRef Object;
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FCbPackage Package;
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ECacheRecordType Type = ECacheRecordType::None;
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};
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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} // DerivedData
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} // UE
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#undef UE_API
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