How to manage time in java servlet?

Question

Auction servlet- This is a java servlet that waits for 2-3 minutes after the first user made the request.so i need to keep track of time in my servlet. so when the time finishes using some logic it would send response to some users...

Example: lets say my 10 users are sending a request to my auction servlet, and I want to check that, 2-3 minutes have been passed since that first user made request

and when the time finishes, using some logic i want to send a response to my some users after 2-3 minutes.

I have tried to use TimerTask in HTTpServelt but got an error of access denied.

question hard to understand, give some details, what You have done? — Jacek Cz, Feb 08 '17 at 19:16
@BalusC I doubt it is a duplicate, TimerTaks is not for measuring but for scheduling. Although I agree it is hard to tell what the actual question is. — Jens Schauder, Feb 08 '17 at 19:23
sorry for not making it more clear.. Basically I would like to run my servlet for 2-3 minutes and then stop but i do not want to use a cron jobs here — vicky dhudasiya, Feb 08 '17 at 19:37
@vickydhudasiya Edit your Question with clarifications rather than posting as Comments. — Basil Bourque, Feb 08 '17 at 23:00
@Basil Bourque I have edited the question.. please let me know what do you think about it — vicky dhudasiya, Feb 09 '17 at 23:42

score 0 · Answer 1 · edited May 23 '17 at 12:33

Your Question is not clear. You may not fully understand how Java Servlet technology works.

A Servlet is a class that is loaded upon first request by a client (web browser, etc.) or preloaded when servlet container starts. A thread is assigned to handle each incoming request to generate the outgoing response. Normally the servlet object does not stop running once started, until the servlet container closes. You must understand that a single servlet object servlets handles many request-response cycles by many users. See more discussion here.

A session is launched for each individual user’s set of request-response cycles. Each session is represented by a HttpSession object. Sessions automatically time-out if the user stops making requests. Implementations commonly default to a half-hour until time-out. You can adjust that default. This is probably the solution you are looking for, but I'm not sure given the lack of clarity in your question. Call setMaxInactiveInterval on that session object.

int seconds = TimeUnit.MINUTES.toSeconds( 3 ) ;  // Three minutes converted to a number of seconds.
someHttpSession.setMaxInactiveInterval( seconds );

Also, you can programmatically close a session by calling invalidate on that session object, as discussed here.

You can ask for that session’s start time as a count of milliseconds since the epoch of 1970 UTC by calling getCreationTime.

long millisSinceEpoch = someHttpSession.getCreationTime();

Make an Instant from that to see that moment in UTC.

Instant instantSessionStarted = Instant.ofEpochMilli( millisSinceEpoch );

Use Duration object to see elapsed time. For current moment, call Instant.now.

Duration durationOfThisSession = Duration.between( instantSessionStarted , Instant.now() );

Thank you very much for your reply.. This answer really help me to understand some servlet concepts — vicky dhudasiya, Feb 09 '17 at 23:40

How to manage time in java servlet?

1 Answers1