anchor.diff:      /// Register an ICloudChannelProvider instance. Defaults to Service Bus queue implementation with configuration's Service Bus connection string.
       member this.RegisterDictionaryProvider(dictionary : ICloudDictionaryProvider) = 
           check () ; dictionaryProvider <- Some dictionary
  -    
  -    /// Register a local filesystem cache implementation. Defaults to FileSystemStore in local TEMP folder.
  -    member this.RegisterCache(cacheStore : ICloudFileStore) =
  -        check () ; cache <- Some <| cacheStore
   
       /// Add a custom resource in workers ResourceRegistry.
       member this.RegisterResource(resource : 'TResource) = check () ; customResources <- customResources.Register(resource)
  
positive.code: open MBrace.Azure.Runtime.Info
  open MBrace.Azure.Runtime.Utilities
  
  
  /// MBrace Runtime Service.
  type Service (config : Configuration, serviceId : string) =
      // TODO : Add locks
  
negative.code:     let mutable channelDirectory = None
      let mutable atomDirectory    = None
  
      let mutable ignoreVersion   = true
      let mutable customResources = ResourceRegistry.Empty
      let mutable configuration   = config
  