code: private String createInternalActionId()
      {
          final StringBuilder sb;
  
          sb = new StringBuilder();
          sb.append(this.hashCode());
          sb.append("_");
          sb.append(actionIdCounter.getAndIncrement());
  
          return sb.toString();
      }
docs: Creates a new unique internal action id based on the hash code of this
  connection and a sequence.
  
  @return a new internal action id
  @see ManagerUtil#addInternalActionId(String,String)
  @see ManagerUtil#getInternalActionId(String)
  @see ManagerUtil#stripInternalActionId(String)