1. Epic GamesDeveloper
  3. UOnlineHotfixManager

UOnlineHotfixManager

This class manages the downloading and application of hotfix data Hotfix data is a set of non-executable files downloaded and applied to the game.

Unreal Engine C++ API Reference > Plugins > Hotfix

Inheritance Hierarchy

References

   
Module Hotfix
Header /Engine/Plugins/Online/OnlineFramework/Source/Hotfix/Public/OnlineHotfixManager.h
Include #include "OnlineHotfixManager.h"

Syntax

UCLASS&40;Config&61;Engine&41;  
class UOnlineHotfixManager : public UObject

Remarks

This class manages the downloading and application of hotfix data Hotfix data is a set of non-executable files downloaded and applied to the game. The base implementation knows how to handle INI, PAK, and locres files. NOTE: Each INI/PAK file must be prefixed by the platform name they are targeted at

Variables

  Type Name Description
Public variable UProperty Transient TArray< TObjectPtr< UObject > > AssetsHotfixedFromIniFiles Array of objects that we're forcing to remain resident because we've applied live hotfixes and won't get an opportunity to reapply changes if the object is evicted from memory.
Public variable TUniquePtr< FAsyncLoadingFlushContext > AsyncFlushContext Asynchronously flush async loading before starting the hotfixing process.
Public variable bool bHotfixingInProgress Some title file interfaces aren't re-entrant so handle it ourselves
Public variable bool bHotfixNeedsMapReload Set to true if any PAK file contains an update to a level that is currently loaded
Public variable bool bLogMountedPakContents Whether we want to log all of the files that are in a mounted pak file or not
Public variable TArray< FCloudFileHeader > ChangedHotfixFileList The set of hotfix files that have changed from the last time we applied them
Public variable uint32 ChangedOrRemovedPakCount If we have removed or changed a currently mounted PAK file, then we'll need to restart the app because there's no simple undo for objects that were loaded and possibly rooted
Public variable UProperty Config FString DebugPrefix Used to prevent development work from interfering with playtests, etc.
Public variable FString DefaultPrefix Normally will be "Default" but could be different if we have a debug prefix
Public variable FString GameContentPath Holds a chunk of string that will be swapped for Game during processing pak files (MyGame/Content/Maps -> /Game/Maps)
Public variable TArray< FCloudFileHeader > HotfixFileList The filtered list of files that are part of the hotfix
Public variable UProperty Config FString HotfixManagerClassName Tells the factory method which class to contruct
Public variable TArray< FConfigFileBackup > IniBackups Backup copies of INI files that change during hotfixing so they can be undone afterward
Public variable TArray< FCloudFileHeader > LastHotfixFileList The last set of hotfix files that was applied so we can determine whether we are up to date or not
Public variable TArray< FString > MountedPakFiles Holds which files have been mounted for unmounting
Public variable uint64 NumBytes  
Public variable uint32 NumDownloaded  
Protected variable FOnEnumerateFilesCompleteDelegate OnEnumerateFilesCompleteDelegate Callbacks for when the title file interface is done
Protected variable FDelegateHandle OnEnumerateFilesCompleteDelegateHandle  
Protected variable FDelegateHandle OnEnumerateFilesForAvailabilityCompleteDelegateHandle  
Public variable FOnHotfixComplete OnHotfixCompleteDelegates Delegate fired when the hotfix process has completed
Public variable FOnHotfixProcessedFile OnHotfixProcessedFileDelegates Delegate fired for each new/updated file after it is applied
Public variable FOnHotfixProgress OnHotfixProgressDelegates Delegate fired as the hotfix files are read
Public variable FOnHotfixRemovedFile OnHotfixRemovedFileDelegates Delegate fired for each removed file
Public variable FOnHotfixUpdatedFile OnHotfixUpdatedFileDelegates Delegate fired for each added/updated file
Protected variable IOnlineTitleFilePtr OnlineTitleFile The online interface to use for downloading the hotfix files
Protected variable FOnReadFileCompleteDelegate OnReadFileCompleteDelegate  
Protected variable FDelegateHandle OnReadFileCompleteDelegateHandle  
Protected variable FOnReadFileProgressDelegate OnReadFileProgressDelegate  
Protected variable FDelegateHandle OnReadFileProgressDelegateHandle  
Public variable UProperty Config FString OSSName Tells the hotfix manager which OSS to use. Uses the default if empty
Public variable TWeakObjectPtr< UWorld > OwnerWorld Our passed-in World
Public variable TMap< FString, FPendingFileDLProgress > PendingHotfixFiles Holds which files are pending download
Public variable FString PlatformPrefix Used to match any PAK files for this platform
Public variable TArray< FCloudFileHeader > RemovedHotfixFileList The set of hotfix files that have been removed from the last time we applied them
Public variable FString ServerPrefix Used to match any server-only hotfixes
Public variable uint64 TotalBytes Tracks the size of the files being processed as part of the hotfix
Public variable uint32 TotalFiles Tracks how many files are being processed as part of the hotfix

Constructors

  Type Name Description
Public function    
Public function    

Destructors

  Type Name Description
Public function Virtual    

Functions

  Type Name Description
Public function Virtual FDelegateHandle  
Public function Virtual FDelegateHandle  
Public function Virtual FDelegateHandle  
Public function Virtual FDelegateHandle  
Public function Virtual FDelegateHandle  
Public function EHotfixResult Looks at each file returned via the hotfix and processes them
Protected function Virtual bool

ApplyHotfixProcessing ( const FCloudFileHeader& FileHeader
)

 Called when a file needs custom processing (see above).
Public function FConfigFileBackup &

BackupIniFile ( const FString& IniName,
const FConfigFile* ConfigFile
)

 Stores off the INI file for restoration later
Public function FString

BuildConfigCacheKey ( const FString& IniName
)

  
Public function void Builds the list of files that are different between two runs of the hotfix process
Public function Virtual void

CheckAvailability ( FOnHotfixAvailableComplete& InCompletionDelegate
)

 Check for available hotfix files (but do not apply them)
Public function Virtual void

Cleanup ()

  
Public function Virtual void  
Public function Virtual void  
Public function Virtual void  
Public function Virtual void  
Public function Virtual void  
Public function Virtual void  
Public function Virtual void  
Public function Virtual void  
Public function Virtual void  
Public function Virtual void  
Public function void Checks each file listed to see if it is a hotfix file to process
Public function Static UOnlineHotfixManager *

Get ( UWorld* World
)

 Factory method that returns the configured hotfix manager
Protected function Virtual FString Override this to change the default caching directory
Public function FConfigFile *

GetConfigFile ( const FString& IniName
)

  
Protected function Virtual Const FString Allow the application to override the dedicated server filename prefix.
Protected function FCloudFileHeader *

GetFileHeaderFromDLName ( const FString& FileName
)

 Finds the header associated with the file name
Public function Const const FString  
Public function Virtual FString

GetStrippedConfigFileName ( const FString& IniName
)

  
Public function Const UWorld *  
Protected function Virtual bool

HotfixIniFile ( const FString& FileName,
const FString& IniData
)

 Override this to change the default INI file handling (merge delta INI changes into the config cache)
Protected function Virtual bool

HotfixPakFile ( const FCloudFileHeader& FileHeader
)

 Override this to change the default PAK file handling:
Protected function Virtual bool

HotfixPakIniFile ( const FString& FileName
)

 Override this to change the default INI file handling (merge whole INI files into the config cache)
Protected function void

HotfixRowUpdate ( UObject* Asset,
const FString& AssetPath,
const FString& RowName,
const FString& ColumnName,
const FString& NewValue,
TArray< FString >& ProblemStrings,
TSet< class UDataTable* >* ChangedTables
)

 Used in PatchAssetsFromIniFiles to hotfix only a row in a table.
Protected function void

HotfixTableUpdate ( UObject* Asset,
const FString& AssetPath,
const FString& JsonData,
TArray< FString >& ProblemStrings
)

 Used in PatchAssetsFromIniFiles to hotfix an entire table.
Public function Virtual void

Init ()

  
Protected function bool

IsCompatibleHotfixFile ( const FString& InFilename,
FString& OutFilename
)

 Is this hotfix file compatible with the current build If the file has version information it is compared with compatibility If the file has NO version information it is assumed compatible
Public function bool

IsMapLoaded ( const FString& MapName
)

  
Public function void

OnEnumerateFilesComplete ( bool bWasSuccessful,
const FString& ErrorStr
)

 Called once the list of hotfix files has been retrieved
Public function void

OnEnumerateFilesForAvailabilityComplete ( bool bWasSuccessful,
const FString& ErrorStr,
FOnHotfixAvailableComplete InCompletionDelegate
)

 Called once the list of hotfix files has been retrieved and we only want to see if a hotfix is necessary
Protected function Virtual void

OnHotfixAvailablityCheck ( const TArray< FCloudFileHeader >& PendingChangedFiles,
const TArray< FCloudFileHeader >& PendingRemoveFiles
)

 Notify used by CheckAvailability()
Protected function Virtual void

OnHotfixTableValueDouble ( UObject& Asset,
const FString& RowName,
const FString& ColumnName,
const double& OldValue,
const double& NewValue
)

  
Protected function Virtual void

OnHotfixTableValueFloat ( UObject& Asset,
const FString& RowName,
const FString& ColumnName,
const float& OldValue,
const float& NewValue
)

  
Protected function Virtual void

OnHotfixTableValueInt64 ( UObject& Asset,
const FString& RowName,
const FString& ColumnName,
const int64& OldValue,
const int64& NewValue
)

 Called after modifying table values by HotfixRowUpdate()
Protected function Virtual void

OnHotfixTableValueName ( UObject& Asset,
const FString& RowName,
const FString& ColumnName,
const FName& OldValue,
const FName& NewValue
)

  
Protected function Virtual void

OnHotfixTableValueObject ( UObject& Asset,
const FString& RowName,
const FString& ColumnName,
const UObject* OldValue,
const UObject* NewValue
)

  
Protected function Virtual void

OnHotfixTableValueSoftObject ( UObject& Asset,
const FString& RowName,
const FString& ColumnName,
const FSoftObjectPtr& OldValue,
const FSoftObjectPtr& NewValue
)

  
Protected function Virtual void

OnHotfixTableValueString ( UObject& Asset,
const FString& RowName,
const FString& ColumnName,
const FString& OldValue,
const FString& NewValue
)

  
Public function void

OnReadFileComplete ( bool bWasSuccessful,
const FString& FileName
)

 Called as files are downloaded to determine when to apply the hotfix data
Public function void

OnReadFileProgress ( const FString& FileName,
uint64 BytesRead
)

 Called as files are downloaded to provide progress notifications
Protected function Virtual void Called after any hotfixes are applied to apply last-second changes to certain asset types from .ini file data
Protected function Virtual Const bool

PreProcessDownloadedFileData ( const FCloudFileHeader& FileHeader,
TArray< uint8 >& FileData
)

 Called prior to reading the file data.
Public function void Starts the async reading process for the hotfix files
Public function void Restores any changed INI files to their default loaded state
Protected function Virtual bool  
Protected function Virtual Const bool  
Public function Virtual UFunction BlueprintCallable, Category void Starts the fetching of hotfix data from the OnlineTitleFileInterface that is registered for this game
Public function void Cleans up and fires the delegate indicating it's done
Public function Virtual void  
Public function Virtual void

TriggerOnHotfixProcessedFileDelegates ( const FString& Param1,
const FString& Param2
)

  
Public function Virtual void

TriggerOnHotfixProgressDelegates ( uint32 Param1,
uint32 Param2,
uint64 Param3,
uint64 Param4
)

  
Public function Virtual void  
Public function Virtual void

TriggerOnHotfixUpdatedFileDelegates ( const FString& Param1,
const TArray< uint8 >& Param2
)

  
Public function void Unmounts any changed PAK files so they can be re-mounted after downloading
Protected function void

UpdateProgress ( uint32 FileCount,
uint64 UpdateSize
)

 Fires the progress delegate with our updated progress
Protected function Virtual bool

WantsHotfixProcessing ( const FCloudFileHeader& FileHeader
)

 Override this method to look at the file information for any game specific hotfix processing NOTE: Make sure to call Super to get default handling of files

Overridden from UObject

  Type Name Description
Public function Virtual void Called after the C++ constructor and after the properties have been initialized, including those loaded from config.

Classes

  Type Name Description
Public struct FConfigFileBackup    
Public struct FPendingFileDLProgress    

Deprecated Functions

  Type Name Description
Protected function Virtual Const bool

PreProcessDownloadedFileData ( TArray< uint8 >& FileData
)

 Replaced with PreProcessDownloadedFileData taking a FCloudFileHeader

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