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Legacy:LibHTTP/HttpCache
From Unreal Wiki, The Unreal Engine Documentation Site
Disk\Memory cache for LibHTTP, it will handle caching of data. To use it simply create a HttpCache object and use it's get() request to get updated documents. Don't use a HttpSock instance for this.
When using this class it will perform a specially constructed get request when it's needed, it will try to satisfy the caching headers returned by the server. Ihis class is only usefull if you know the remote server returns correct cachable data. By default most dynamic pages (ASP, PHP, Perl, CGI) will return non-cachable pages.
Contents
Properties
- array<CacheInfoRecord> CacheList
- cache list, each entry is an URL
- array<HttpCacheObject> CacheObjectList
- the spawned cache objects
- class<HttpCacheObject> HttpCacheObjectClass
- class<HttpSock> HttpSockClass
- array<CacheRequest> Requests
- running requests
Options
- int iCacheLimit
- maximum cache size (entries?)
Enums
ECacheFailError
Reasons for a failure
- CF_None
- CF_BadRequest
- CF_AuthRequired
- CF_Timeout
- CF_ResolveFailed
- CF_Busy
- CF_Unknown
EDataOrigin
Hints where the data came from
- DO_Unknown
- DO_Cache
- DO_Initial
- DO_Refresh
Structures
CacheInfoRecord
records of the cached entries
- int colidx
- index in the CacheObjectList, volatile
- int DataSize
- last datazie
- int Hash
- hash used for record info
- int LastUpdate
- last update
- HttpUtil.xURL URL
- the request URL
CacheRequest
- int idx
- HttpSock Socket
Delegates
- OnComplete(HttpCache Sender, HttpCacheObject Data, EDataOrigin origin )
- Will be called when the operation was completed successfully.
- int OnCreateSock(HttpCache Sender, HttpSock Socket )
- Will be called after the HttpSock instance has been created. Use it to set certain variables and delegates for the HttpSock.
Note: You shouldn't set any delegates in the sccket, most will be overwritten anyway.
- OnError(HttpCache Sender, string ErrorMessage, optional string Param1, optional string Param2 )
- Will be called in case of an internal error.
- OnFail(HttpCache Sender, int idx, ECacheFailError reason )
- failed to complete the request, will be called when everything fails
Functions
- CacheCleanup( )
- Clean up the cache
- int createHash(string URL )
- return the hash of the URL
- DownloadComplete(HttpSock Sender )
- DownloadError(HttpSock Sender, string ErrorMessage, optional string Param1, optional string Param2 )
- DownloadTimeout(HttpSock Sender )
- int findCacheRecord(int hash )
- find an idx using a hash
- int get(string location )
- Performs a get request. Returns the ID of the request. This Id can be used in to retrieve the URL in the future
- HttpCacheObject getCacheObject(int idx )
- get\create a CacheObject
- bool getURLbyId(int id, out string URL )
- Returns the URL for a certain ID. Result will be false when the ID is no longer valid.
- bool isCached(string location )
- Returns true when the location is cached
- ResolveFailed(HttpSock Sender, string hostname )
Events
- PreBeginPlay( )
