code: public void close()
            throws SIConnectionDroppedException, SIErrorException
     {
        if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.entry(this, tc, "close");
  
        queue = null;
  
        if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) SibTr.debug(this, tc, "Returning order context to the order context pool");
        final ConnectionProxy cp = getConnectionProxy();
        cp.addOrderContext(getProxyID());
  
        if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) SibTr.exit(this, tc, "close");
     }
docs: This method will close the ordering context. This method should ideally be called by the API
  application. But at present, it is called by us when the use count is 0. The order context
  is only returned to the connection pool of free order contexts as this avoids an exchange
  with the server which is costly.
  
  @throws SIConnectionDroppedException
  @throws SIErrorException