Re: [Exist-open] Locking resources

[Wolfgang M. <wol...@ex...>]

Hi,

> From what I gather resource locking is handled in the
> UserManagementService. The lockResource method appears to acquire a
> write lock - how does one acquire a read lock on a resource? 

The lockResource method acquires a persistent exclusive-write lock on a 
document. The document will remain locked even if you stop and restart the 
database. Contrary to this, the locks that can be acquired through the XQuery 
functions util:shared-lock and util:exclusive-lock are shared-read/exclusive 
write locks (that reminds me that I still haven't fixed the util:shared-lock 
bug reported by Sjur).

Persistent read locks are currently not supported, though this would be 
possible to implement.

> Also can 
> I only lock one resource at a time or is it possible to lock multiple
> resources (or perhaps a collection?)

You can lock multiple resources by calling lockResource multiple times.

Wolfgang