I think what Alex meant is that in this case, the Entity should have the file contents as its value. This is a trick I have pulled a couple of times.
The other option, why don't you open the file as "Locked", so that some other software application in the OS can't do anything while you are working on this file?
Regards, Steve
Ittay Dror wrote:
On Thu, 2003-07-10 at 11:42, Alexey Loubyansky wrote:
Hello Ittay,
JBoss can lock the entity bean for you. If you use the default container configuration (Standard CMP 2.x EntityBean) and don't mark the methods in the entity bean as read-only, once entity's method is called, the entity is locked and other transactions will wait for lock release. The lock will be released when the tx that put the lock ends.
i know about this, but that is not what i need. i need to lock the
operations that *use* the entity, not the operations *of* the entity. in
the example i gave, imagine i have a file and i want to add a line with
the properties of the enitity. if i read the properties one by one and
write them to the file, then there's a chance that some other thread
will do the same and the result will be undetermined. basically, i want
to know that while i'm reading / changing the properties of the entity
no other thread is doing the same.
alex
Thursday, July 10, 2003, 11:01:21 AM, Ittay Dror wrote:
ID> say i have a session bean that does some work that is not ejb related. ID> for example, it creates a file with some data. the data in the file is ID> based on the contents of an entity bean. now, i want to synchronize on ID> the entity bean so that two sessio beans will not write to the file ID> simultaniously. how can i do that? can i do 'synchronize (entityBean)'? ID> or do i need to create some map from the entityBean's primary key to an ID> object for locking on it? or is there another way? (the data file is for ID> example only, so a solution of locking on the file is not good).
ID> thank you, ID> Ittay
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