uk.ac.ed.epcc.webapp.servlet

Class HeartbeatServlet

java.lang.Object

HttpServlet

uk.ac.ed.epcc.webapp.servlet.WebappServlet

uk.ac.ed.epcc.webapp.servlet.ContainerAuthServlet

uk.ac.ed.epcc.webapp.servlet.HeartbeatServlet

public class HeartbeatServlet
extends ContainerAuthServlet

A servlet to trigger timed events from a remote cron job Alternatively if the parameter HeartbeatServlet.run_thread is set to true the heartbeat will be run from a thread at a frequency of HeartbeatServlet.repeat minutes. The default is not to run a thread but trigger the heartbeatservet from an external cron. this is to avoid multiple heartbeats in a fail-over or parallel deployment configuration

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	HeartbeatServlet.Runner

Field Summary

Fields

Modifier and Type	Field and Description
HeartbeatServlet.Runner	runner
java.util.concurrent.ScheduledExecutorService	service

Fields inherited from class uk.ac.ed.epcc.webapp.servlet.WebappServlet

ARGS, CONFIRM_NO, CONFIRM_POST_URL, CONFIRM_TYPE, CONFIRM_YES, EXTRA_HTML, MESSAGE_EXTRA_ATTR, MESSAGE_TYPE_ATTR, MESSAGES_JSP_URL, SCRIPTS_CONFIRM_JSP

Constructor Summary

Constructors

Constructor and Description
HeartbeatServlet()

Method Summary

Modifier and Type	Method and Description
void	destroy()
protected void	doPost(HttpServletRequest req, HttpServletResponse res, AppContext conn, java.lang.String user)
static java.util.Date	getLastCall()
void	init(ServletConfig config)
static void	reset()
boolean	runHeartbeat(AppContext conn, ServletOutputStream out)

Methods inherited from class uk.ac.ed.epcc.webapp.servlet.ContainerAuthServlet

doPost, verify

Methods inherited from class uk.ac.ed.epcc.webapp.servlet.WebappServlet

badInputCheck, checkBadInput, confirm, confirm, doGet, doPost, doPut, doPut, encodeCGI, getLogger, handleFormResult, message, message, messageWithArgs, sendMessageWithArgs

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

runner

public HeartbeatServlet.Runner runner

service

public java.util.concurrent.ScheduledExecutorService service

Constructor Detail

HeartbeatServlet

public HeartbeatServlet()

Method Detail

doPost

protected void doPost(HttpServletRequest req,
                      HttpServletResponse res,
                      AppContext conn,
                      java.lang.String user)
               throws ServletException,
                      java.io.IOException

Specified by:

doPost in class ContainerAuthServlet

Throws:

ServletException

java.io.IOException

getLastCall

public static java.util.Date getLastCall()

runHeartbeat

public boolean runHeartbeat(AppContext conn,
                            ServletOutputStream out)
                     throws java.io.IOException

Throws:

java.io.IOException

init

public void init(ServletConfig config)
          throws ServletException

Throws:

ServletException

destroy

public void destroy()

reset

public static void reset()