web services - Azure Appfabric Caching + WCF Webservices -

i have series of wcf web services hosted in windows azure , trying implement appfabric caching.

i struggling stateless nature of web services , need avoid expensive initialisation of datacachefactory , datacache objects.

i have wrapped datacachefactory in singleton seemed place start.....

imports microsoft.applicationserver.caching public class cache      private shared _datacachefactory datacachefactory     private shared _datacache microsoft.applicationserver.caching.datacache      private sub new()      end sub       shared readonly property datacachefactory datacachefactory                     if isnothing(_datacachefactory)                  dim localtimeout new timespan(0, 10, 0)                 dim localcacheconfig new datacachelocalcacheproperties(10000, localtimeout, datacachelocalcacheinvalidationpolicy.timeoutbased)                 dim factoryconfig new datacachefactoryconfiguration()                    factoryconfig.localcacheproperties = localcacheconfig                  _datacachefactory = new datacachefactory(factoryconfig)              end if              return _datacachefactory          end     end property      shared readonly property datacache microsoft.applicationserver.caching.datacache                     if isnothing(_datacache)                 _datacache = datacachefactory.getdefaultcache             end if              return _datacache          end     end property  end class 

but when try use it, seems going out of scope , being recreated repeatedly instead of once per azure instance. if understanding things correctly comes down to.....where can store global variable in wcf web service doesn't go out of scope.

from can see code should doing want doing. thing suggest (which has nothing problem) put locking around creation e.g. shortest property:

private static _datacachelock new object()  shared readonly property datacache microsoft.applicationserver.caching.datacache             if isnothing(_datacache)              synchlock _datacachelock)                  if isnothing(_datacache)                      _datacache = datacachefactory.getdefaultcache                  end if              end synchlock         end if          return _datacache      end end property 

it important have static datacachefactory not avoid costly initialisation, because each 1 of these objects create uses 1 of few cache connections have (you 5 lowest cache size).

static variables stay in scope unless web role or application pool gets restarted.

how catching datacachefactory being recreated?