Class EventSourceServlet

  • All Implemented Interfaces:, javax.servlet.Servlet, javax.servlet.ServletConfig

    public abstract class EventSourceServlet
    extends javax.servlet.http.HttpServlet

    A servlet that implements the event source protocol, also known as "server sent events".

    This servlet must be subclassed to implement abstract method newEventSource(HttpServletRequest) to return an instance of EventSource that allows application to listen for event source events and to emit event source events.

    This servlet supports the following configuration parameters:

    • heartBeatPeriod, that specifies the heartbeat period, in seconds, used to check whether the connection has been closed by the client; defaults to 10 seconds.

    NOTE: there is currently no support for last-event-id.

    See Also:
    Serialized Form
    • Method Summary

      All Methods Instance Methods Abstract Methods Concrete Methods 
      Modifier and Type Method Description
      void destroy()  
      protected void doGet​(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)  
      void init()  
      protected abstract EventSource newEventSource​(javax.servlet.http.HttpServletRequest request)  
      protected void open​(EventSource eventSource, EventSource.Emitter emitter)  
      protected void respond​(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)  
      • Methods inherited from class javax.servlet.http.HttpServlet

        doDelete, doHead, doOptions, doPost, doPut, doTrace, getLastModified, service, service
      • Methods inherited from class javax.servlet.GenericServlet

        getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, log, log
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Constructor Detail

      • EventSourceServlet

        public EventSourceServlet()
    • Method Detail

      • init

        public void init()
                  throws javax.servlet.ServletException
        init in class javax.servlet.GenericServlet
      • destroy

        public void destroy()
        Specified by:
        destroy in interface javax.servlet.Servlet
        destroy in class javax.servlet.GenericServlet
      • doGet

        protected void doGet​(javax.servlet.http.HttpServletRequest request,
                             javax.servlet.http.HttpServletResponse response)
                      throws javax.servlet.ServletException,
        doGet in class javax.servlet.http.HttpServlet
      • newEventSource

        protected abstract EventSource newEventSource​(javax.servlet.http.HttpServletRequest request)
      • respond

        protected void respond​(javax.servlet.http.HttpServletRequest request,
                               javax.servlet.http.HttpServletResponse response)