[CAY-1322] Multiple Transactions: Migrate from Singleton pattern

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Fix Version/s: Undefined future
• Component/s: Core Library
• Assignee: Unassigned
• Reporter: Evgeny Ryabitskiy
• Created: 01/Dec/09 12:48
• Updated: 29/Sep/14 19:52

Description

Duplication from Dev-list:

So.. I have several modules, each has own DomainConfig file and
connection to it's DataBase. Sometimes there can be used different DB
servers and even different DB types (usually it's Oracle and MS SQL,
sometimes Sybase).

Singletons:
1) Configuration.getSharedConfiguration()
This problem is solved:
DefaultConfiguration conf = new DefaultConfiguration("module1-cayenne.xml");
conf .initialize;
conf.getDomain();
//spend some time to find solution... everywhere examples with
SharedConfiguration

2)DataContext.getThreadLocal()
Solved by own ThreadLocal for each module. (modules can work in one thread)
//also spend some time

3)Transaction.getThreadTransaction()
this is killing one!!!
using of own ThreadLocal doesn't help.
It's hard-coded in performing Query to use this singleton
Transaction.getThreadTransaction()
And that is really huge problem for me.

So me suggestion is to move this ThreadLocal to DataDomain. Still can
use singleton API for standalone applications.
Also we can move DataContext to DataDomain.