[VELOCITY-267] Create a DataSourceResourceLoader that can be wired to the datasource with IoC

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.5
• Fix Version/s: 1.5
• Component/s: Engine
• Environment: Operating System: other; Platform: Other
• Bugzilla Id: 28611
• Assignee: Unassigned
• Reporter: Matt Raible
• Created: 27/Apr/04 10:54
• Updated: 08/Mar/07 00:04
• Resolved: 15/Oct/05 14:14

Description

I'd like to create a ResourceLoader similar to DataSourceResourceLoader, except that I'd like to set
the DataSource via IoC (in Spring). The main reason for this is so my database-loading of templates
does not depend on a JNDI connection.

The main problem is how to manage a ResourceLoader with Spring and then set it declaratively on its
VelocityEngine - rather than via properties.

<suggested patch from Will Glass-Husain>
Does this mean that you'd need to pass in an instance of a resource manager
(initialized with the datasource) to VelocityEngine, rather than just set
the class name as a property? (MR - Yes)

As I understand the source code, this doesn't seem possible. But I think a
patch wouldn't be difficult. (a change to
RuntimeInstance.initializeResourceManager) to look for an instance of the
class as well as the class name. Something similar to
LogManager.createLogSystem which accepts as a property the class name of a
class that implements LogSystem, or an instance of the class itself.
</suggested patch>