What is the mechanism to ensure that 2 different process should not read\write to the same file at a time in java

Question

I m working in java. I have an application which will read & write one sample.txt file. And one more application which will also read & write to same file. And first application will run for every 1 minute as windows service. My doubt is now how, can make sure that both applications should r/w at the same time. Any suggestions plz.

See: http://stackoverflow.com/questions/128038/how-can-i-lock-a-file-using-java-if-possible — kiheru, Jul 18 '13 at 14:07

score 3 · Answer 1 · answered Jul 18 '13 at 14:09

3

As you want to lock access from different application if i understand it right. You can use FileLock here an example

answered Jul 18 '13 at 14:09

Moti Korets

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Here. This is the right answer. People nowadays reads questions too fast. – Doodad Jul 18 '13 at 14:11

score 1 · Answer 2 · answered Jul 18 '13 at 14:05

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You need to guard the file access code through synchronized block or methods. Learn more about synchronization here:

http://javarevisited.blogspot.in/2011/04/synchronization-in-java-synchronized.html

answered Jul 18 '13 at 14:05

Juned Ahsan

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this would only work within **one** java application – amphied Jul 18 '13 at 15:12

score 0 · Answer 3 · answered Jul 18 '13 at 14:07

0

Simples solution is to use the synchronized keyword.

public synchronized int i = 1;

in this way i can only be accessed from one thread at the time. But this is expansive! There are many concepts of synchronization, e.g. the monitor

Read this for more information: http://www.artima.com/insidejvm/ed2/threadsynch.html

answered Jul 18 '13 at 14:07

Mirco

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this would only work within **one** java application – amphied Jul 18 '13 at 15:12
this will work in one jvm – Mirco Jul 18 '13 at 15:23

What is the mechanism to ensure that 2 different process should not read\write to the same file at a time in java

3 Answers3