Hi, Benoit and Tony,
I'm concerned about the following response because it's dangerous.
Here is the advice given at
http://en.wikibooks.org/wiki/Programming:WebObjects/EOF/
Using_EOF/Context_and_Database_Locking
============================================
David LeBer:
In general you are better to lock EC's in the session (if you've got
one) rather than the component.
As that is the usual approach, there are a couple of solutions to
implement that for you:
MultiECLockManager
Project Wonder's ERXEC
Jonathan Rochkind:
Note: One very handy (if I do say so myself) reusable solution for
locking ECs you create (not neccesary for session default EC) can be
found at: http://WOCode.com/cgi-bin/WebObjects/WOCode.woa/wa/
ShareCodeItem?itemId=301
Anjo Krank:
One thing to watch out for is that EC locking on the page's awake()
and sleep() doesn't really work, because awake may be called more
often than sleep. This means that normally you can't use DirectToWeb
because it does just that. However, ProjectWonder has an editing
context factory, an automatically locking and unlocking EC subclass
and a lock manager that will relaese all locks when the application
sleeps.
This works nicely with long response pages, provided that you don't
use the session's editing context in the long running task.
============================================
Regards,
Jerry
On Jun 12, 2007, at 4:07 AM, Anthony Paras wrote:
In my apps, I've done the following in my components when I've
needed a peer
editing context, and I've never had any problems:
public EditFooInfo(WOContext context) {
super(context);
ec = new EOEditingContext();
}
public void awake() {
super.awake();
ec.lock();
}
public void sleep() {
super.sleep();
ec.unlock();
}
You might want to log the locks and unlocks to see that they match up.
Also, you have so many sessions, yet you say you don't need
sessions. You
could structure the app so it does not create sessions, or maybe
just use
the session, and then do a...
session().setTimeOut(1);
To make them go away quickly.
- Tony
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