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public int id() throws DbException;
The DbLockTab.id method returns a locker ID, which is guaranteed to be unique in the specified lock table.
The Berkeley DB access methods generate a unique locker ID for each file that is opened with locking. During Berkeley DB access method operation, this locker ID will be used for all lock calls unless a transaction identifier was specified for the call, in which case the transaction ID specified is used as the locker ID.
The DbLockTab.id method throws an exception that encapsulates an errno on failure.
The DbLockTab.id method may fail and throw an exception for any of the errors specified for the following Berkeley DB and C library functions: abort(3), fcntl(3), fprintf(3), and getpid(3).