private void decrementSessionSizeCounters(DefaultSmppSession session) {
   this.counters.decrementSessionSizeAndGet();
   switch (session.getBindType()) {
     case TRANSCEIVER:
       this.counters.decrementTransceiverSessionSizeAndGet();
       break;
     case RECEIVER:
       this.counters.decrementTransmitterSessionSizeAndGet();
       break;
     case TRANSMITTER:
       this.counters.decrementReceiverSessionSizeAndGet();
       break;
   }
 }