multithreading - Java: thread-safe RandomAccessFile

Question

After some serious googleing I found out that the RandomAccessFile-class is not thread-safe. Now I could use one semaphore to lock all reads and writes but I don't think that performs very well. In theory it should be possible to do multiple reads and one write at a time. How can I do this in Java? Is it possible at all?

Thanks!

Answer 1

I could use one semaphore to lock all reads and writes but I don't think that performs very well.

With respect to performance, NEVER think. ALWAYS measure.

That said, java.util.concurrent.locks.ReentrantReadWriteLock is what you are looking for.