CODEWITHSUNDEEP
javaprocesssynchronizationfilelockjava.nio.file
user3736770
user3736770

Reputation: 63

Process Synchronization in java

Process A writes in a file XYZ, when executed. There are processes B and C, which when executed, reads the file XYZ. So, while process A is up, B and C should wait for A to complete. To provide synchronization can I use java.nio package? or I should use something like FileLock or sockets? Can we mention the time to wait for the second process to wait?

Edited: The file is created during the first write process. In such case, can I make it shared resource?

Upvotes: 4

Views: 1720

Answers (3)

Harbinger
Harbinger

Reputation: 762

Using java.nio package's file lock could be a better solution, I hope. But, I think java.nio is not full-fledged till JDK 1.6. http://www.withoutbook.com/DifferenceBetweenSubjects.php?subId1=7&subId2=43&d=Java%206%20vs%20Java%207

FileLock: http://docs.oracle.com/javase/7/docs/api/java/nio/channels/FileLock.html

Upvotes: 1

SamDJava
SamDJava

Reputation: 267

Using locks would be a good idea. You can use Conditions from JavaAPi. Refer to [http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/locks/Condition.html#awaitNanos(long)][1]

When A is working it should signal the thread to await and then on completion it can signal so that other thread waiting to start can proceed. Also this is very appropriate when we use shared resource.

Upvotes: 0

Ben Win
Ben Win

Reputation: 840

One way could be the usage of a flag. Just a boolean stillWriting which is readable from outside. As soon process A did its Job, this flag is set to false and your processes B/C can start their work with this file. Assuming A wants to start again editing this file, it'll set this flag back to true and block the other two processes.

Upvotes: 0

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