• 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
  • Tim Cooke
  • paul wheaton
  • Ron McLeod
  • Jeanne Boyarsky
Sheriffs:
  • Paul Clapham
Saloon Keepers:
  • Tim Holloway
  • Roland Mueller
Bartenders:

Regarding Lock on file

 
Ranch Hand
Posts: 157
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi All

Can we lock the file for reading-writing i.e if one java program reads the file and no other program could read before the first program complete writing it.

Thanks
Vikas
 
Ranch Hand
Posts: 73
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
I believe the actual "locking" depends on the operating system. The lock may be implemented as an advisory lock, so if other apps don't check for it, they won't know the file is locked.

try {
File file = new File("myfile");
FileChannel fileChannel = new RandomAccessFile(file, "rw").getChannel();

FileLock myLock = fileChannel.lock();

try {
myLock = fileChannel.tryLock();
} catch (OverlappingFileLockException e) {

}

myLock.release();

fileChannel.close();
} catch (Exception e) {
}

Eric
[ April 14, 2007: Message edited by: Eric Gero ]
 
Hey! Wanna see my flashlight? It looks like this tiny ad:
Clean our rivers and oceans from home
https://www.kickstarter.com/projects/paulwheaton/willow-feeders
reply
    Bookmark Topic Watch Topic
  • New Topic