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Synchronization in the update-Method.

Olena Golub
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I have 3 tier architecture. Every client receives the own instance of the Data class through ConnectionFactory.
All locked records with locked cookies I saved in:

Inside the lock and unlock methods I synchronize lockedRecord.

But I am totaly lost about the update method. I will check the lockedRecords in this method, therefore I need also
to syncronize lockedRecords.
But what about RandomAccessFile raf?
Should I also synchronize it in the update method?
Or should I not synchronize the RandomAccessFile object at all to prevent from the dead-locks?
My write method is also not synchronized.

Could you help me?
Thanks a lot for your help!
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