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Use of Java.Util.Concurrent in multi-core server

Posted on 2011-09-07
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Hi:

What are things you have to take care of during multi-threaded programming using java.util.concurrent (java.util.concurrent package for Java 7) on multi core server.

Please let me know any thread safety issue's due in use of this package on multi-core or multi processor server.
 
Best Regards,

-Sunnybrad
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Question by:sunnybrad
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by:gordon_vt02
ID: 36504615
Take a look at the book Java Concurrency in Practice by Brian Goetz.  It's a great reference for concurrent programming and explains a lot of methods for making objects thread-safe.

http://jcip.net/
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gordon_vt02 earned 2000 total points
ID: 36504671
A quick summary of things to watch out for:

You need to make sure that any objects you are sharing among multiple threads are thread-safe.  The easiest way to do this is to make them immutable.  If the state of the object can't change, there are no issues sharing it among multiple threads.

If shared objects must be changed by one or more threads, you have several options:
- Use the built-in synchronized keyword on the accessor and mutator methods for the shared state
- Create a private final Object in your class that is used to lock only the code blocks that mutate the object.  (synchronized (lockObject) { // mutation code })
- Use the java.util.concurrent.AtomicXxx classes to provide atomic operations for ints, booleans, and other common types.
- Use the concurrency uttilities (Locks, Mutexes, etc.) in java.util.concurrent to handle explicit locking/unlocking of critical sections of your code.

There are other options as well, such as the volatile keyword, but I'd recommend reading one of the references out there -- JCIP being a great one -- for all the details and potential pitfalls.
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