package org.lsst.ccs.bus;
   
   import java.util.ArrayList;
   import java.util.ServiceLoader;
   
   /**
    */
   public abstract class TransportManager {
       static ArrayList<TransportManager> transportManagers = new ArrayList<TransportManager>() ;
      
      static {
          ServiceLoader<TransportManager> loader = ServiceLoader.load(TransportManager.class) ;
          for(TransportManager transportManager : loader) {
              transportManagers.add(transportManager) ;
          }
      }
  
      public static BusMessagingLayer getConnection(String protocolstring, String propertiesString) 
          throws TransportException{
          for(TransportManager manager : transportManagers) {
              BusMessagingLayer transport = manager.getInstance(protocolstring, propertiesString) ;
              if(transport != null) {
                   // see new version of BusApplicationLayer
                  // transport.setMembershipListener(new DefaultLogMembershipListener());
                  return transport ;
              }
          }
          throw new TransportException(protocolstring) ;
      }
      
      public abstract BusMessagingLayer getInstance(String protocolString, String propertiesString) ;
  }