/**
  * Setting an ID lets the browser keep track of the last event fired so that if, the connection to
  * the server is dropped, a special HTTP header (Last-Event-ID) is set with the new request. This
  * lets the browser determine which event is appropriate to fire.
  *
  * @param eventId Unique event id.
  * @param data data associated with event
  */
 public void sendDataById(String eventId, String data) {
   out.write(
       "id: "
           + eventId
           + "\r\n"
           + "data: "
           + StringEscapeUtils.escapeEcmaScript(data)
           + "\r\n\r\n");
 }
 /**
  * A single event source can generate different types events by including an event name. On the
  * client, an event listener can be setup to listen to that particular event.
  *
  * @param eventName Unique name of the event.
  * @param data data associated with event
  * @deprecated Replaced by send
  */
 public void sendDataByName(String eventName, String data) {
   out.write(
       "event: "
           + eventName
           + "\r\n"
           + "data: "
           + StringEscapeUtils.escapeEcmaScript(data)
           + "\r\n\r\n");
 }
 /**
  * Sending a generic event. On the client, 'message' event listener can be setup to listen to this
  * event.
  *
  * @param data data associated with event
  */
 public void sendData(String data) {
   out.write("data: " + data + "\r\n\r\n");
 }