code: protected void setPersistentData(int priority,
                                      Reliability reliability,
                                      long completedPrefix) throws SIResourceException
    {
      getSubset(reliability).setPersistentData(priority, completedPrefix);    
    }
docs: Set the persistent data for a specific stream
  
  @param priority
  @param reliability
  @param completedPrefix
  @throws SIResourceException