• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Paul Clapham
  • Ron McLeod
  • Jeanne Boyarsky
  • Tim Cooke
Sheriffs:
  • Liutauras Vilda
  • paul wheaton
  • Henry Wong
Saloon Keepers:
  • Tim Moores
  • Tim Holloway
  • Stephan van Hulst
  • Carey Brown
  • Frits Walraven
Bartenders:
  • Piet Souris
  • Himai Minh

Stopping an infinite loop

 
Ranch Hand
Posts: 625
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
I have created a simple web server, that goes in a continuous loop to accept connections. This works fine. But now I need to implement a feature to be able to stop the server and the infinite loop, and I wasn't sure how to do this. So I basically want to be able to type in a command to stop the server. My problem is that when I use a BufferedReader from System.in it just blocks if there is nothing to read, and in this instance I need the loop to continue. Here's the relevant code:



How can I can I stop the server if need be?

Thanks for any help.
 
Ranch Hand
Posts: 1923
Scala Postgres Database Linux
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
What's about:


And create a separate Thread, which reads from System.in, and on a 'stop' read, allow it to call 'stopIt ();'?
 
(instanceof Sidekick)
Posts: 8791
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
My Wiki executes command classes when you post forms. One of the forms triggers a shutdown command that sets a variable that stops the loop just as shown above. So I can just navigate to a page and hit a button to shut it down from anywhere. I also made a little standalone program that pretends to be a browser and posts the shutdown form. Oh, it is secured - you have to log in with a userid that has shutdown permission.
 
Ranch Hand
Posts: 1608
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator


Note that this field should almost certainly be declared 'volatile'.

'almost certainly' because you almost certainly will be changing the value from a thread other than the one executing the while loop.
 
Ranch Hand
Posts: 1312
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
You should use Thread/Runable to implement your program.
 
Sean Casey
Ranch Hand
Posts: 625
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
thanks for all your help guys.
 
Joel Salatin has signs on his property that say "Trespassers will be Impressed!" Impressive tiny ad:
free, earth-friendly heat - a kickstarter for putting coin in your pocket while saving the earth
https://coderanch.com/t/751654/free-earth-friendly-heat-kickstarter
reply
    Bookmark Topic Watch Topic
  • New Topic