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Java Forum / General / September 2006App in the background
Hello, I would like to write stand-alone application which would download some files from network every x hrs (specified by the user). I think I would do it that, that user would just specify the time and minimalize it (it will be minimalized or I will decide to put it to systray) and then app every x hrs will wake up and do its job. How can I do it without slowing a lot OS (processor/memory)? I was thinking about threads and wait/sleep function but not know if it is effective method. What do you think?!? Regards, mark > I would like to write stand-alone application which would download some > files from network every x hrs (specified by the user). I think I would [quoted text clipped - 5 lines] > thinking about threads and wait/sleep function but not know if it is > effective method. What do you think?!? You don't say what your target OS is or if you want to write a OS you're running on or if you want to write something that's OS-agnostic so its difficult to give specific advice. Personally, I'd do it with cron because then there are no overheads at all. However, I do run Linux....  Signaturemartin@ | Martin Gregorie gregorie. | Essex, UK org | Hello, > You don't say what your target OS is or if you want to write a OS you're > running on or if you want to write something that's OS-agnostic so its > difficult to give specific advice. It is going to be MS Windows. Regards, mark > Hello, > [quoted text clipped - 3 lines] > > It is going to be MS Windows. Have you considered writing the application so it does the transfers you need and then quits and running it under the control of the Windows Scheduler? Tis way you get a simple application and there's already a GUI (supplied by MS) that can control when it gets run. Signaturemartin@ | Martin Gregorie gregorie. | Essex, UK org | > Hello, > [quoted text clipped - 5 lines] > > Regards, mark Yes, ditto to what Martin said. Much better to use the OS features than to try to do everything yourself. On Windows 2000 (mine), there's a control panel for this: Start->Programs->Accessories->System Tools->Scheduled Tasks Encourage the user to place your app here. This provides effectively 0% overhead, just like cron. I don't think there's any way you can provide that. Just having the JVM up at all is a pretty large overhead, if it's going to be doing nothing except expiring a counter every 24 hours. Also, think about other paradigms. If you are updating another app, consider having it check for updates whenever its run. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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