Create a new type of lock manager
---------------------------------
Key: TRANSACTION-20
URL: https://issues.apache.org/jira/browse/TRANSACTION-20
Project: Commons Transaction
Issue Type: New Feature
Affects Versions: 2.0
Reporter: Oliver Zeigermann
Assignee: Oliver Zeigermann
For the new implementations we need a new type of lock manager. We need
something general that can be used for the file manager, the tx maps, and
optionally can even be used in a general programming environment.
This is my proposal. It is meant to be used by one or more transactional
resource managers:
public interface LockManager<K> {
public void startWork(long timeout, TimeUnit unit);
public void endWork();
public void lock(K key, boolean exclusive) throws LockException;
}
Where "startWork" starts a block of work for which a certain set of locks is
required and "endWork" ends it. Only in between these call one can use the
"lock" method to lock resources denoted by the given key.
The timeout is meant for the whole block of work and thus does not have to be
passed with every lock request.
At the end of the working block all locks are released.
The "lock" method throws an exception in case of timeout, interruption or
deadlock.
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