654 lines
20 KiB
Ucode
654 lines
20 KiB
Ucode
/**
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* Copyright 1998-2013 Epic Games, Inc. All Rights Reserved.
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*
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* An encapsulated system which utilizes CloudStorageBase to manage save data.
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*/
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class CloudSaveSystem extends Object
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native;
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cpptext
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{
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public:
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void SerializeObject(class UObject* ObjectToSerialize, FMemoryWriter& MemoryWriter, int VersionNumber);
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UObject* DeserializeObject(class UClass* ObjectClass, FMemoryReader MemoryReader, BYTE VersionSupport, int VersionNumber);
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};
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//==============================================================================
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const NUM_SAVE_SLOTS_KEY = "NumSaveSlots";
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const DATA_STORE_ID_KEY = "DataStoreID";
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const SAVE_DATA_BLOB_NAME_KEY = "DataBlobName";
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const SAVE_SYSTEM_VERSION_KEY = "CloudSaveSystemVersion";
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const COMMON_DATA_SAVE_SLOT_INDEX = -1;
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const GET_SAVE_SLOT_ERROR =-2;
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const GET_SAVE_SLOT_INVALID = -1;
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enum SaveDataVersionSupport
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{
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SaveDataVersionSupportLessThenEqual,
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SaveDataVersionSupportEqual,
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SaveDataVersionSupportAny,
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};
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//==============================================================================
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var private transient CloudSaveSystemKVSInterface KeyValueStore;
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var private transient CloudSaveSystemDataBlobStoreInterface DataBlobStore;
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//==============================================================================
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struct native GetSaveDataCallbackStruct
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{
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var int SlotIndex;
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var delegate<OnGetSaveDataCallback> Callback;
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};
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var private transient array<GetSaveDataCallbackStruct> OnGetSaveDataCallbacks;
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struct native SetSaveDataCallbackStruct
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{
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var int SlotIndex;
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var delegate<SaveSystemCallback> Callback;
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};
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var private transient array<SetSaveDataCallbackStruct> OnSetSaveDataCallbacks;
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var private transient delegate<SaveSystemCallback> DeleteSaveDataCallback;
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var private transient int ActiveSlotForDelete;
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enum SaveSlotOperationEnum
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{
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SSO_SET,
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SSO_GET,
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SSO_DELETE
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};
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struct native SaveSlotOperation
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{
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var int SlotIndex;
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var SaveSlotOperationEnum SlotOperation;
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};
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var private transient array<SaveSlotOperation> ActiveSaveSlotOperations;
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//==============================================================================
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delegate OnGetSaveDataCallback(bool bWasSuccessful, int SaveSlot, out array<byte> DataBlob, string Error);
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delegate SaveSystemCallback(bool bWasSuccessful, int SaveSlot, string Error);
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//==============================================================================
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//==============================================================================
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//Utility Functions
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//==============================================================================
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//Returns the number of save slots.
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final function bool GetNumberOfSaveSlots(out int NumSaveSlots)
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{
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local PlatformInterfaceDelegateResult KVRes;
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local bool RValue;
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RValue = false;
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if (KeyValueStore != None && DataBlobStore != None)
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{
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//NumSaveSlots is slot agnostic so save to slot 0 for default name generation
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KeyValueStore.ReadKeyValue(COMMON_DATA_SAVE_SLOT_INDEX, NUM_SAVE_SLOTS_KEY, PIDT_Int, KVRes);
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if (KVRes.bSuccessful)
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{
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RValue = true;
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NumSaveSlots = KVRes.Data.IntValue;
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}
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}
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return RValue;
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}
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//Returns -1 on no match, slot index on match and -2 on error.
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final function private int DoesSaveSlotKeyValueDataAlreadyExist(string DataStoreID, string DataBlobName)
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{
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local int SaveSlotScan;
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local int NumSaveSlots;
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local string CompareDataStoreID;
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local string CompareDataBlobName;
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local int RValue;
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RValue = GET_SAVE_SLOT_INVALID;
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if (KeyValueStore != None && DataBlobStore != None && GetNumberOfSaveSlots(NumSaveSlots))
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{
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for (SaveSlotScan = 0; SaveSlotScan < NumSaveSlots; ++SaveSlotScan)
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{
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if (GetDataStoreIDAndBlobNameForSaveSlot(SaveSlotScan, CompareDataStoreID, CompareDataBlobName))
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{
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if (DataStoreID == CompareDataStoreID && DataBlobName == CompareDataBlobName)
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{
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RValue = SaveSlotScan;
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break;
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}
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}
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else
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{
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//Set error code
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RValue = GET_SAVE_SLOT_ERROR;
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}
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}
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}
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else
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{
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//Set error code
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RValue = GET_SAVE_SLOT_ERROR;
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}
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return RValue;
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}
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final private function bool WriteNumSaveSlots(int NumSaveSlots)
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{
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local PlatformInterfaceData KVSet;
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KVSet.IntValue = NumSaveSlots;
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KVSet.Type = PIDT_Int;
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if (KeyValueStore.WriteKeyValue(COMMON_DATA_SAVE_SLOT_INDEX, NUM_SAVE_SLOTS_KEY, KVSet))
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{
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return true;
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}
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return false;
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}
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final function bool IsOperationActiveForSlot(int SlotIndex)
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{
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local int Index;
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Index = ActiveSaveSlotOperations.Find('SlotIndex', SlotIndex);
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if (Index == INDEX_NONE)
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{
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return false;
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}
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else
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{
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return true;
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}
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}
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final function bool IsDeleteOperationActive()
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{
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if (ActiveSlotForDelete == -1)
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{
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return false;
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}
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else
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{
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return true;
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}
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}
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final function bool AreAnySlotOperationsActive()
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{
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if (ActiveSaveSlotOperations.Length > 0)
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{
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return true;
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}
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else
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{
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return false;
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}
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}
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//==============================================================================
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//Native Functions
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//==============================================================================
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native final function SerializeObject(Object ObjectToSerialize, out array<byte> Data, int DataVersion);
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//Will return none if the version of the data isn't supported
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native final function Object DeserializeObject(class ObjectClass, out array<byte> Data, SaveDataVersionSupport VersionSupport, int DataVersion);
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//==============================================================================
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//Init Functions
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//==============================================================================
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//Initializes the CloudSaveSystem into a usable state
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final function Init(CloudSaveSystemKVSInterface InKeyValueStore, CloudSaveSystemDataBlobStoreInterface InDataBlobStore, int VersionNumber)
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{
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local PlatformInterfaceDelegateResult SaveSystemVersionNumber;
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local PlatformInterfaceData SaveSystemVersionNumberSet;
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KeyValueStore = InKeyValueStore;
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DataBlobStore = InDataBlobStore;
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GetKeyValue(COMMON_DATA_SAVE_SLOT_INDEX, SAVE_SYSTEM_VERSION_KEY, PIDT_Int, SaveSystemVersionNumber);
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if (!SaveSystemVersionNumber.bSuccessful || SaveSystemVersionNumber.Data.IntValue != VersionNumber)
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{
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SaveSystemVersionNumberSet.IntValue = VersionNumber;
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SaveSystemVersionNumberSet.Type = PIDT_Int;
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SetKeyValue(COMMON_DATA_SAVE_SLOT_INDEX, SAVE_SYSTEM_VERSION_KEY, SaveSystemVersionNumberSet);
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WriteNumSaveSlots(0);
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}
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}
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//==============================================================================
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//Data Retrieval
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//==============================================================================
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//Starts an async request that retrieves the save data blob for the given save slot.
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//Save slot indexing is zero based.
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final function GetSaveData(int SaveSlot, delegate<OnGetSaveDataCallback> OnGetSaveDataCallback)
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{
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local string DataStoreID;
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local GetSaveDataCallbackStruct CallbackStruct;
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local SaveSlotOperation SlotOperation;
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local array<byte> EmptyBuffer;
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local string BlobName;
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local bool ErrorOccured;
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local string Error;
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ErrorOccured = true;
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if (KeyValueStore == None)
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{
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Error="GetSaveData::KeyValueStore instance cannot be None";
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}
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else if (DataBlobStore == None)
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{
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Error="GetSaveData::DataBlobStore instance cannot be None";
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}
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else if (OnGetSaveDataCallbacks.Find('SlotIndex', SaveSlot) != INDEX_NONE)
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{
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Error="GetSaveData::OnGetSaveDataCallback already present for save slot";
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}
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else if (ActiveSaveSlotOperations.Find('SlotIndex', SaveSlot) != INDEX_NONE)
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{
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Error="GetSaveData::Save System operation already active for save slot";
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}
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else if (IsDeleteOperationActive())
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{
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Error="GetSaveData::Delete Operation active cannot GetSaveData";
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}
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else if (!GetDataStoreIDAndBlobNameForSaveSlot(SaveSlot, DataStoreID, BlobName))
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{
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Error="GetSaveData::Failed to get store id and data blob name for save slot";
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}
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else
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{
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CallbackStruct.SlotIndex = SaveSlot;
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CallbackStruct.Callback = OnGetSaveDataCallback;
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OnGetSaveDataCallbacks.AddItem(CallbackStruct);
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SlotOperation.SlotIndex = SaveSlot;
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SlotOperation.SlotOperation = SSO_GET;
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ActiveSaveSlotOperations.AddItem(SlotOperation);
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DataBlobStore.GetDataBlob(DataStoreID, BlobName, OnGetSaveDataComplete);
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ErrorOccured = false;
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}
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if (ErrorOccured && OnGetSaveDataCallback != None)
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{
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OnGetSaveDataCallback(false/*bWasSuccessful*/, SaveSlot, EmptyBuffer, Error);
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}
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}
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final function private OnGetSaveDataComplete(bool bWasSuccessful, string StorageID, string BlobName, out array<byte> DataBlob, string Error)
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{
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local int SaveSlotIndex;
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local int Index;
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local delegate<OnGetSaveDataCallback> LocalCallback;
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SaveSlotIndex = DoesSaveSlotKeyValueDataAlreadyExist(StorageID, BlobName);
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if (SaveSlotIndex >= 0)
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{
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//----------------------------------------------------------------------
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Index = ActiveSaveSlotOperations.Find('SlotIndex', SaveSlotIndex);
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if (Index != INDEX_NONE)
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{
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if(ActiveSaveSlotOperations[Index].SlotOperation != SSO_GET)
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{
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bWasSuccessful = false;
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Error = "CloudSaveSystem in corrupt stat GetSaveData request finished but active slot operation should have been"@ActiveSaveSlotOperations[Index].SlotOperation;
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}
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ActiveSaveSlotOperations.Remove(Index, 1);
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}
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else
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{
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bWasSuccessful = false;
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Error = "CloudSaveSystem in corrupt state GetData request finished but was not correctly internally tracked.";
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}
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Index = OnGetSaveDataCallbacks.Find('SlotIndex', SaveSlotIndex);
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if (Index != INDEX_NONE)
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{
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LocalCallback = OnGetSaveDataCallbacks[Index].Callback;
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LocalCallback(bWasSuccessful, SaveSlotIndex, DataBlob, "Unknown Error loading data blob from Cloud");
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OnGetSaveDataCallbacks.Remove(Index, 1);
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}
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}
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else
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{
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`warn("CloudSaveSystem in corrupt sate. save slot index does not exist for ID:"@StorageID@"BlobName:"@BlobName);
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}
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}
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//==============================================================================
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//Data Saving
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//==============================================================================
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//Sets the save data blob for the given save slot. Save slot indexing is zero based.
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final function SetSaveData(int SaveSlot, delegate<SaveSystemCallback> InSetSaveDataCallback, const out array<byte> SaveDataBlob)
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{
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local SetSaveDataCallbackStruct CallbackStruct;
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local SaveSlotOperation SlotOperation;
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local string DataStoreID;
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local string BlobName;
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local bool ErrorOccured;
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local string Error;
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ErrorOccured = true;
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if (KeyValueStore == None)
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{
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Error="SetSaveData::KeyValueStore instance cannot be None";
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}
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else if (DataBlobStore == None)
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{
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Error="SetSaveData::DataBlobStore instance cannot be None";
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}
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else if (OnSetSaveDataCallbacks.Find('SlotIndex', SaveSlot) != INDEX_NONE)
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{
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Error="SetSaveData::OnSetSaveDataCallback already present for save slot";
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}
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else if (ActiveSaveSlotOperations.Find('SlotIndex', SaveSlot) != INDEX_NONE)
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{
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Error="SetSaveData::Save System operation already active for save slot";
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}
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else if (IsDeleteOperationActive())
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{
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Error="SetSaveData::Delete Operation active cannot SetSaveData";
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}
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else if (!GetDataStoreIDAndBlobNameForSaveSlot(SaveSlot, DataStoreID, BlobName))
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{
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Error="SetSaveData::Failed to get store id and data blob name for save slot";
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}
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else
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{
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CallbackStruct.SlotIndex = SaveSlot;
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CallbackStruct.Callback = InSetSaveDataCallback;
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OnSetSaveDataCallbacks.AddItem(CallbackStruct);
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SlotOperation.SlotIndex = SaveSlot;
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SlotOperation.SlotOperation = SSO_SET;
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ActiveSaveSlotOperations.AddItem(SlotOperation);
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ErrorOccured = false;
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DataBlobStore.SetDataBlob(DataStoreID, BlobName, SaveDataBlob, OnSetSaveDataComplete);
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}
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if (ErrorOccured && InSetSaveDataCallback != None)
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{
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InSetSaveDataCallback(false/*bWasSuccesfful*/, SaveSlot, Error);
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}
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}
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final function private OnSetSaveDataComplete(bool bWasSucessfull, string StorageID, string BlobName, string Error)
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{
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local int SaveSlotIndex;
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local int Index;
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local delegate<SaveSystemCallback> LocalCallback;
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SaveSlotIndex = DoesSaveSlotKeyValueDataAlreadyExist(StorageID, BlobName);
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if (SaveSlotIndex >= 0)
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{
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//----------------------------------------------------------------------
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Index = ActiveSaveSlotOperations.Find('SlotIndex', SaveSlotIndex);
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if (Index != INDEX_NONE)
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{
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if(ActiveSaveSlotOperations[Index].SlotOperation != SSO_SET)
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{
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Error = "CloudSaveSystem in corrupt stat Set Data request finished but active slot operation should have been"@ActiveSaveSlotOperations[Index].SlotOperation;
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bWasSucessfull = false;
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}
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ActiveSaveSlotOperations.Remove(Index, 1);
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}
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else
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{
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bWasSucessfull = false;
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Error = "CloudSaveSystem in corrupt state Set Data request finished but was not correctly internally tracked.";
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}
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//----------------------------------------------------------------------
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Index = OnSetSaveDataCallbacks.Find('SlotIndex', SaveSlotIndex);
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if (Index != INDEX_NONE)
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{
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LocalCallback = OnSetSaveDataCallbacks[Index].Callback;
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LocalCallback(bWasSucessfull, SaveSlotIndex, Error);
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OnSetSaveDataCallbacks.Remove(Index, 1);
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}
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}
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else
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{
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`warn("CloudSaveSystem in corrupt sate. Save slot index does not exist for ID:"@StorageID@"BlobName:"@BlobName);
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}
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}
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//==============================================================================
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//Data Deletion
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//==============================================================================
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final function bool DeleteSaveData(int SaveSlot, delegate<SaveSystemCallback> InDeleteSaveDataCallback )
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{
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local string DataStoreID;
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local string BlobName;
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local SaveSlotOperation SlotOperation;
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local bool RValue;
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RValue = false;
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if (KeyValueStore != None && DataBlobStore != None
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&& DeleteSaveDataCallback == None
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&& !AreAnySlotOperationsActive()
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&& !IsDeleteOperationActive())
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{
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if(GetDataStoreIDAndBlobNameForSaveSlot(SaveSlot, DataStoreID, BlobName))
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{
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RValue = DataBlobStore.DeleteDataBlob(DataStoreID, BlobName,OnDeleteSaveDataComplete);
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if (RValue)
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{
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DeleteSaveDataCallback = InDeleteSaveDataCallback;
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ActiveSlotForDelete = SaveSlot;
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SlotOperation.SlotIndex = SaveSlot;
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SlotOperation.SlotOperation = SSO_DELETE;
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ActiveSaveSlotOperations.AddItem(SlotOperation);
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}
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}
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}
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return RValue;
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}
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final function OnDeleteSaveDataComplete(bool bWasSucessfull, string StorageID, string BlobName, string Error)
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{
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local delegate<SaveSystemCallback> Callback;
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local int Scan;
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local int Index;
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local int SlotDeleted;
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local int NumSaveSlots;
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local string DataStoreID;
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local string DataBlobName;
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if (bWasSucessfull)
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{
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if(!GetNumberOfSaveSlots(NumSaveSlots))
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{
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bWasSucessfull = false;
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Error = "Could not retrieve number of save slots during slot deletion. Save system in corrupt state.";
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}
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else
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{
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for (Scan = ActiveSlotForDelete+1; Scan < NumSaveSlots && bWasSucessfull; ++Scan)
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{
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if(!GetDataStoreIDAndBlobNameForSaveSlot(Scan, DataStoreID, DataBlobName))
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{
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bWasSucessfull = false;
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Error = "Error retrieving DataStoreID and DataBlobName during slot deletion. Save system in corrupt state.";
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}
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else if (!InternalSetSaveSlotKeyValues(Scan-1, DataStoreID, DataBlobName))
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{
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bWasSucessfull = false;
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Error = "Error migrating DataStoreID and DataBlobName to new slot during slot deletion. Save system in corrupt state.";
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}
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}
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if (bWasSucessfull)
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{
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NumSaveSlots--;
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if(!WriteNumSaveSlots(NumSaveSlots))
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{
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bWasSucessfull = false;
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Error = "Error writing number of save slot to Cloud KVS";
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}
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}
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}
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}
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//--------------------------------------------------------------------------
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SlotDeleted = ActiveSlotForDelete;
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ActiveSlotForDelete = -1;
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//--------------------------------------------------------------------------
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Index = ActiveSaveSlotOperations.Find('SlotIndex', SlotDeleted);
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if (Index != INDEX_NONE)
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{
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if(ActiveSaveSlotOperations[Index].SlotOperation != SSO_DELETE)
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{
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`warn("CloudSaveSystem in corrupt stat DeleteSaveData request finished but active slot operation should have been"@ActiveSaveSlotOperations[Index].SlotOperation);
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}
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ActiveSaveSlotOperations.Remove(Index, 1);
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}
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else
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{
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`warn("CloudSaveSystem in corrupt state DeleteSaveData request finished but was not correctly internally tracked.");
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}
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//--------------------------------------------------------------------------
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if (DeleteSaveDataCallback != None)
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{
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Callback = DeleteSaveDataCallback;
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DeleteSaveDataCallback = None;
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Callback(bWasSucessfull, SlotDeleted, Error);
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}
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}
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//==============================================================================
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//Key Value Sets
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//==============================================================================
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//Sets the key values for a given save slot. If the save slot exists the data will be
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//overwritten, otherwise a new slot will be created
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final function bool SetSaveSlotKeyValues(string DataStoreID, string SaveDataBlobName, out int SaveSlot)
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{
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local bool RValue;
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local int NumSaveSlots;
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local bool IncSlotCount;
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RValue = false;
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IncSlotCount = false;
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if (KeyValueStore != None && DataBlobStore != None && GetNumberOfSaveSlots(NumSaveSlots))
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{
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SaveSlot = DoesSaveSlotKeyValueDataAlreadyExist(DataStoreID, SaveDataBlobName);
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//Error retrieving result do not change stored data
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if (SaveSlot == GET_SAVE_SLOT_ERROR)
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{
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return false;
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}
|
|
else if (SaveSlot == GET_SAVE_SLOT_INVALID)
|
|
{
|
|
//No matching data found
|
|
SaveSlot = NumSaveSlots;
|
|
IncSlotCount = true;
|
|
}
|
|
|
|
if(InternalSetSaveSlotKeyValues(SaveSlot, DataStoreID, SaveDataBlobName))
|
|
{
|
|
if (IncSlotCount)
|
|
{
|
|
NumSaveSlots++;
|
|
if (WriteNumSaveSlots(NumSaveSlots))
|
|
{
|
|
RValue = true;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
RValue = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return RValue;
|
|
}
|
|
|
|
final private function bool InternalSetSaveSlotKeyValues(int SaveSlot, string DataStoreID, string SaveDataBlobName)
|
|
{
|
|
local PlatformInterfaceData KVSet;
|
|
local bool RValue;
|
|
|
|
RValue = false;
|
|
|
|
KVSet.StringValue = DataStoreID;
|
|
KVSet.Type = PIDT_String;
|
|
if(KeyValueStore.WriteKeyValue(SaveSlot, DATA_STORE_ID_KEY, KVSet))
|
|
{
|
|
KVSet.StringValue = SaveDataBlobName;
|
|
KVSet.Type = PIDT_String;
|
|
if(KeyValueStore.WriteKeyValue(SaveSlot, SAVE_DATA_BLOB_NAME_KEY, KVSet))
|
|
{
|
|
RValue = true;
|
|
}
|
|
}
|
|
|
|
return RValue;
|
|
}
|
|
|
|
final function bool SetKeyValue(int SaveSlot, string KeyName, const out PlatformInterfaceData Value)
|
|
{
|
|
if (KeyValueStore == None)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
return KeyValueStore.WriteKeyValue(SaveSlot, KeyName, Value);
|
|
}
|
|
|
|
//==============================================================================
|
|
//Key Value Gets
|
|
//==============================================================================
|
|
//Populates DataStoreID and DataBlobName with the data stored in the Key Value Store
|
|
final function private bool GetDataStoreIDAndBlobNameForSaveSlot(int SaveSlot, out string DataStoreID, out string DataBlobName)
|
|
{
|
|
|
|
local PlatformInterfaceDelegateResult KVRes;
|
|
local bool RValue;
|
|
|
|
RValue = false;
|
|
if (KeyValueStore != None || DataBlobStore != None)
|
|
{
|
|
KeyValueStore.ReadKeyValue(SaveSlot, DATA_STORE_ID_KEY, PIDT_String, KVRes);
|
|
if (KVRes.bSuccessful)
|
|
{
|
|
DataStoreID = KVRes.Data.StringValue;
|
|
KeyValueStore.ReadKeyValue(SaveSlot, SAVE_DATA_BLOB_NAME_KEY, PIDT_String, KVRes);
|
|
if (KVRes.bSuccessful)
|
|
{
|
|
DataBlobName = KVRes.Data.StringValue;
|
|
RValue = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return RValue;
|
|
}
|
|
|
|
final function bool GetKeyValue(int SaveSlot, string KeyName, EPlatformInterfaceDataType Type, out PlatformInterfaceDelegateResult Value)
|
|
{
|
|
if (KeyValueStore == None)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
return KeyValueStore.ReadKeyValue(SaveSlot, KeyName, Type, Value);
|
|
}
|
|
|
|
DefaultProperties
|
|
{
|
|
ActiveSlotForDelete = -1
|
|
} |