Java synchronization between different JVMs

10,879

Solution 1

That's right. You can not use any standard synchronization mechanisms because they are working into one JVM.

Solutions

  1. You can use file locks introduced in java 7.
  2. You can use synchronization via database entities.
  3. One of already implemented solutions like Terracota may be helpful
  4. Re-think your design. If you are beginner in java world try to talk in details with more experienced engineers. Your question shows that IMHO you are just on wrong way.

Solution 2

You can use synchronized keyword, locks, atomic objects, etc. - but they are local to the JVM. So if you have two JVMs running the same program, they can still e.g. run the same synchronized method at the same time - one on each JVM, but not more.

Solutions:

  • provides distributed locking

  • as well

  • you can use manual synchronization on file system or database

Solution 3

I'm using distributed lock provided by Redisson to synchronize work of different JVMs

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tytchong
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tytchong

Updated on June 04, 2022

Comments

  • tytchong
    tytchong over 1 year

    The project I am working on would trigger various asynchronous jobs to do some work. As I look into it more these asynchronous jobs are actually being run as separate JVMs (separate java processes). Does it mean I would not be able to use any of the following if I need to synchronize between these processes:

    • synchronized methods/blocks
    • any lock that implements java.util.concurrent.locks

    Because it seems to me they are all thread-level?

    Does Java provide support for IPC like semaphores between processes?

  • tytchong
    tytchong over 11 years
    Thanks! We are re-using the same architecture from a different project so some of the designs might not make sense in our world. Many thanks for the input, this is very helpful.
  • user207421
    user207421 over 11 years
    5. You can use file locks introduced in Java 1.4.