;********************************
;*
;* lweb_file_cache.pbi 
;*
;* LiHaSo Webserver Modul In Memory File Cache (Obsolete and replaced by lcmf_main.pbi)
;*
;* It Could be configured Globaly and by Virtualhost
;*

DeclareModule lweb_FC
  Enumeration Server_Type
    #Type_Main                ;Main Server 
    #Type_Virtual_Main        ;Shared Virtual Server which get Data from Main
    #Type_Virtual             ;Standalone Virtual Server which has own Memory Area
  EndEnumeration
  
  ;{ Error Enumeration
  #Err_Unknown                = -1
  #Err_Server_Not_Found       = -2
  #Err_Server_File_Not_Found  = -3
  ;}
  
  Declare.s FC_Config_Get(UUID.s)
  Declare.i FC_Config_Set(UUID.s, ConfigXML.s)
  Declare.i FC_Create(UUID.s, Type.i = #Type_Main)
  Declare.i FC_Destroy(UUID.s)
  Declare.s FC_Status_Get(UUID.s)
  Declare.i FC_GetFile(UUID.s, FileName.s)
  Declare.i FC_SetFile(UUID.s, FileName.s, Memory.i, Size.i)
EndDeclareModule

Module lweb_FC
  Structure St_Jobs
    Type.i
    Memory.i
  EndStructure
    
  Structure St_File
    lifetime.i
    timer.i
    size.i
    memoryID.i
    ThreadID.i
    Accesed.i
    Mutex.i
    Semaphore.i
    List Job.St_Jobs()
  EndStructure
  
  Structure St_FC_Config
    max_life_time.i
    max_total_size.i
    max_file_size.i
    current_total_size.i
    enabled.b
  EndStructure
  
  Structure St_Server
    VServer_UUID.s
    Log_UUID.s
    Status.s
    Thread.i
    Semaphore.i
    Config.St_FC_Config
    Map Files.St_File()
  EndStructure
  
  Structure St_CacheServers
    Main_UUID.s
    Log_UUID.s
    Status.s
    Thread.i
    Map Virtual.St_Server()
  EndStructure
  
  Global Var_FC_Server.St_CacheServers
  
  Declare.i Cache_Cleaner(UUID.s)
  Declare.i Cache_Server(UUID.s)
  Declare.i Cache_File(UUID.s)
  
  Procedure.s FC_Config_Get(UUID.s)
    Protected XMLString.s, XMLID.i
    If FindMapElement(FC\Virtual(), UUID)
      XMLID = CreateXML(#PB_Any)
      InsertXMLMap(RootXMLNode(XMLID), FC\Virtual\
    Else
      ProcedureReturn Str(#Err_Server_Not_Found)
    EndIf
    
  EndProcedure
  
  Procedure.i FC_Config_Set(UUID.s, ConfigXML.s)
    ;Apply the Config XML to the Map
    Protected XML_ID.i
    XML_ID = CreateXML(#PB_Any)
    If XMLStatus(XML_ID) = #PB_XML_Success
      ParseXML(XML_ID, ConfigXML)
      If XMLStatus(XML_ID) = #PB_XML_Success
        ExtractXMLMap(MainXMLNode(XML_ID), @FC\Virtual(UUID), #PB_XML_NoCase)
        FreeXML(XML_ID)
        ProcedureReturn #True
      Else
        FreeXML(XML_ID)
        ProcedureReturn #False
      EndIf
    Else
      If XML_ID <> 0
        FreeXML(XML_ID)
      EndIf
      ProcedureReturn #False
    EndIf
  EndProcedure
  
  Procedure.i FC_Create(UUID.s, Type.i = #Type_Main)
    ;Create the Server
  EndProcedure
  
  Procedure.i FC_Destroy(UUID.s)
    ;Kill Thread Cache Handler Thread.
  EndProcedure
  
  Procedure.s FC_Status_Get(UUID.s)
    ;Status of the Server
  EndEnumeration
  
  Procedure.i FC_GetFile(UUID.s, FileName.s, MemoryID.i)
    ;Fill the Cached File to Memory and if response > 0 it was succesfull.
  EndEnumeration
  
  Procedure.i FC_SetFile(UUID.s, FileName.s, Memory.i, Size.i)
    ;Create cached file thread and save it to thread memory.
  EndEnumeration
  
  Procedure.i Cache_Cleaner(UUID.s)
    ;Cleans out old Files.
    Protected.i Selected
    Protected.i Counter
    Protected.i MaxSize = Information
    Repeat
      Delay(1000)      ;Nur Alle Sekunden Prüfen
      Counter + 1
      LockMutex(file_cache_mutex)
      ResetMap(m_file_cache_map())
      ;Debug "FileCacheCleaner" + Str(Counter) + " Map Size:" + Str(MapSize(m_file_cache_map()))
      If NextMapElement(m_file_cache_map())
        Repeat
          m_file_cache(MapKey(m_file_cache_map()))\Timer - 1
          If m_file_cache(MapKey(m_file_cache_map()))\Timer <= 0
            If m_file_cache(MapKey(m_file_cache_map()))\Buffer > 0
              configuration\cache\current - m_file_cache(MapKey(m_file_cache_map()))\Size
              FreeMemory(m_file_cache(MapKey(m_file_cache_map()))\Buffer)
              DeleteMapElement(m_file_cache(), MapKey(m_file_cache_map()))
              lhs_log_ext::Out(configuration\log\CachelogUUID, "Info:["+Str(innercount)+"] Killed:["+MapKey(m_file_cache_map())+"]")
              Selected = DeleteMapElement(m_file_cache_map())
            Else 
              lhs_log_ext::Out(configuration\log\CachelogUUID, "Info:["+Str(innercount)+"] Could Not kill:["+MapKey(m_file_cache_map())+"]")
            EndIf
          Else
            Selected = NextMapElement(m_file_cache_map())
          EndIf
        Until Selected = 0
      EndIf
      
      UnlockMutex(file_cache_mutex)
      
      
    ForEver
  EndProcedure
  
  Procedure.i Cache_Server(UUID.s)
    ;http://purearea.net/pb/english/manual/reference/ug_memory.html
    Protected FileCacheCleanerThread.i
    Protected Tempbuffer.i, MaxSize.i, Current.i
    MaxSize = configuration\cache\maxsize * 1024 * 1024
    FileCacheCleanerThread = CreateThread(@FileCacheCleaner(), MaxSize)
    
    Repeat
      WaitSemaphore(file_cache_semaphore)
      lhs_log_ext::Out(configuration\log\CachelogUUID, "Adresse:"+m_file_cache()\Buffer)
      If (m_file_cache()\Size + configuration\cache\current) <= MaxSize
        configuration\cache\current + m_file_cache()\Size
        Tempbuffer = AllocateMemory(m_file_cache()\Size)
        CopyMemory(m_file_cache()\Buffer, Tempbuffer, MemorySize(m_file_cache()\Buffer))
        m_file_cache()\Buffer = Tempbuffer
        m_file_cache()\Timer = configuration\cache\time
        m_file_cache()\Is = #True
        m_file_cache_map(MapKey(m_file_cache())) = #True
        SignalSemaphore(file_cache_semaphore_thread)
      Else 
        lhs_log_ext::Out(configuration\log\CachelogUUID, "Cache Full")
        SignalSemaphore(file_cache_semaphore_thread)
      EndIf
      
    ForEver    
  EndProcedure
  
  Procedure.i Cache_File(UUID.s)
    ;Procedure for File_Cache Thread who handles the Cachefile
    Protected MyMemory.i, My_Host_UUID.s = StringField(UUID, 0, ";"),My_File_UUID.s = StringField(UUID, 1, ";"), WorkElement.i
    Repeat
      WaitSemaphore(Var_FC_Server\Virtual(UUID)\Semaphore)
      LockMutex(Var_FC_Server\Virtual(UUID)\Mutex)
      WorkElement = FirstElement(Var_FC_Server\Virtual(UUID)\Files()
      
      UnlockMutex(Var_FC_Server\Virtual(UUID)\Files(UUID)\Mutex)
      
        
    ForEver
    
             
  EndProcedure
  
  
EndModule


;Buggy FileCache Routines ... Wiso auch immer das noch nicht richtig Funktioniert.
  
Procedure FileCacheCleaner(Information.i)

  
EndProcedure
  
Procedure FileCache(Information.i)

EndProcedure

Procedure AddFileToCache(MemoryID.i, FileName.s, Size.i)
  LockMutex(file_cache_mutex)
  lhs_log_ext::Out(configuration\log\CachelogUUID, "Cache MaxSize:"+Str(configuration\cache\maxsize*1024*1024)+" Actual Size:"+Str(configuration\cache\current)) 
  m_file_cache(FileName)\Buffer = MemoryID
  m_file_cache(FileName)\Size = Size
  SignalSemaphore(file_cache_semaphore)
  WaitSemaphore(file_cache_semaphore_thread)
  If m_file_cache(FileName)\Is 
    lhs_log_ext::Out(configuration\log\CachelogUUID, FileName+" Size:"+Str(m_file_cache(FileName)\Size)+" Timer:"+Str(m_file_cache(FileName)\Timer)+ " new Memory ID:"+Str(m_file_cache(FileName)\Buffer))
  Else
    lhs_log_ext::Out(configuration\log\CachelogUUID, "File not in cache was to full:"+FileName+ " MaxSize:"+Str(configuration\cache\maxsize)+" Actual Size:"+Str(configuration\cache\current/1024/1024))
  EndIf
  
  UnlockMutex(file_cache_mutex)
EndProcedure

Procedure.s GetFileFromCache(FileName.s, MemoryID.i)
  Protected String.s
    
  If TryLockMutex(file_cache_mutex)
    If m_file_cache(FileName)\Is
      MemoryID = ReAllocateMemory(MemoryID, m_file_cache(FileName)\Size)
      CopyMemory(m_file_cache(FileName)\Buffer, MemoryID, m_file_cache(FileName)\Size)
      String.s = Str(m_file_cache(FileName)\Size) + ":" + Str(MemoryID)
    Else
      String.s = #error_string
    EndIf
    UnlockMutex(file_cache_mutex)
    lhs_log_ext::OutL(configuration\log\CachelogUUID,lhs_log_ext::#Info, "File from Cache:"+FileName)
    lhs_log_ext::OutL(configuration\log\CachelogUUID,lhs_log_ext::#Debugging, "Content: --------------------------------------------------------")
    lhs_log_ext::OutL(configuration\log\CachelogUUID,lhs_log_ext::#Debugging, String)
    lhs_log_ext::OutL(configuration\log\CachelogUUID,lhs_log_ext::#Debugging, "End Content. ----------------------------------------------------")
    ProcedureReturn String.s
  Else
    ProcedureReturn #error_string
  EndIf
  
EndProcedure