Open Mash Cross Reference
mash/tcl/dc/common/dc-service.tcl

   # dc-service.tcl --
   #
   #       Contains CServiceManager and CService, building blocks of DC
   #       Service Discovery Service.
   #
   # Copyright (c) 2000-2002 The Regents of the University of California.
   # All rights reserved.
   #
   # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions are met:
  #
  # A. Redistributions of source code must retain the above copyright notice,
  #    this list of conditions and the following disclaimer.
  # B. Redistributions in binary form must reproduce the above copyright notice,
  #    this list of conditions and the following disclaimer in the documentation
  #    and/or other materials provided with the distribution.
  # C. Neither the names of the copyright holders nor the names of its
  #    contributors may be used to endorse or promote products derived from this
  #    software without specific prior written permission.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
  # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  # ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
  # ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  import CLinkManager
  import CLink
  
  Class CServiceManager -superclass CLinkManager
  
  CServiceManager public init { szType szAttribute iPort }  {
      $self next $iPort
  
      $self instvar m_szType
      $self instvar m_szAttribute
  
      set m_szType $szType
      set m_szAttribute $szAttribute
  }
  
  
  CServiceManager private NewConnection { newSocket inetAddr iPort } {
      $self instvar m_lAttach
      $self instvar m_lService
      $self instvar m_szType
      $self instvar m_szAttribute
  
      # send out this service manager's type and attribute
      puts $newSocket "$m_szType"
      puts $newSocket "$m_szAttribute"
      flush $newSocket
  
      # get the remote service's type and attribute
      set szType [gets $newSocket]
      set szAttribute [gets $newSocket]
  
      # create the new service with the socket
      set service [new CService $newSocket $inetAddr $iPort $szType $szAttribute]
  
      # now go through the list of attached objects and see if anyone wants it
      foreach attach $m_lAttach {
          set result [$attach NewConnection $service]
          if { $result != 0 } {
              return
          }
      }
  
      # ok no one want's it so stick into a list and maybe some will want it
      # later
      lappend m_lService $service
  }
  
  CServiceManager instproc NewService { inetRemoteAddr iRemotePort \
          { szType "" } { szAttribute "" } } {
      $self instvar m_szType
      $self instvar m_szAttribute
  
      # first create the new socket
      if {[catch {socket $inetRemoteAddr $iRemotePort} sock]} {
          error "CServiceManager: NewService couldn't connect to ${inetRemoteAddr}/${iRemotePort}"
      }
  
      # check that the socket is good
      if { $sock <= 0 } {
          error "CServiceManager: NewService couldn't connect to ${inetRemoteAddr}/${iRemotePort}"
      }
  
      # get the remote service's type and attribute
      set szRemoteType [gets $sock]
      set szRemoteAttribute [gets $sock]
  
      # send out this service manager's type and attribute
      if { $szType == "" && $szAttribute == "" } {
         set szType $m_szType
         set szAttribute $m_szAttribute
     }
 
     puts $sock "$szType"
     puts $sock "$szAttribute"
     flush $sock
 
     set service [new CService $sock $inetRemoteAddr $iRemotePort \
             $szRemoteType $szRemoteAttribute]
 
     return $service
 }
 
 
 
 
 
 Class CService -superclass CLink
 # CService friend CServiceManager
 
 CService private init { sock inetAddr iPort szType szAttribute } {
     $self next $sock 
 
     $self instvar m_szType
     $self instvar m_szAttribute
 
     set m_szType $szType
     set m_szAttribute $szAttribute
 }