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Bidding sites like quibids and ebay has a countdown showing how much time left for the auction. I know this can be taken care on FE and should be fairly easy. What I want to know is how to do this on server side? like sending an email to people participate but didn't win and updating database when times up. I've thought about two approaches to do this.

  1. keep the timer on client side and do updates when the first request hit
  2. open a new thread and make it sleep for x amount of time then wake up to do the updates.

Both approaches don't sound right to me and will lead to issues I think. Like user will likely not getting the updates on time, or server will have lots of sleeping beauty waiting.

naXa stands with Ukraine
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user1865027
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  • Java has timers, examples here: https://stackoverflow.com/questions/14393423/how-to-make-a-countdown-timer-in-java and here: https://stackoverflow.com/questions/7473348/recurring-countdown-timer-in-java – tima Sep 10 '17 at 23:17
  • yes, I know. this is the approach in my second bullet, but as I said, this will eventually lead to a lot of sleeping threads on server which I don't think would be ideal? they will be gone once server restarts – user1865027 Sep 10 '17 at 23:23

2 Answers2

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What I want to know is how to do this on server side? like sending an email to people participate but didn't win and updating database when times up.

The best way may vary depending of technology stack of your server side.

You if are running from a Servlet container (e.g.: Tomcat, Jboss...), you probably want to do something similar to this: Background timer task in JSP/Servlet web application

If you are running a Spring application (e.g.: Spring Boot or Spring MVC), then I recommend @Scheduled or other Task Execution and Scheduling

For advanced scenarios you may want to go with Quartz

Something else, then you should try hooking it up with Java Timer Task

Rafa
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To schedule a task, use a ScheduledExecutorService.

Feras Wilson
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