Hello Amenel, On Thu, Jul 10, 2014 at 01:40:21PM +0100, Amenel VOGLOZIN wrote: > Hi all, > > For a few weeks, I have been writing an extension that can be seen as > a "Recent files manager". I'm using Java and it's going great so far. > > > The problem that I'm encountering is that (I have confirmed this fact > several times) the extension is being instantiated once for each > document that I open. It is also instantiated the first time that > I click on its menu in the menu bar. > > > There's probably something that I didn't do well. How can I make the > extension's component a singleton? Should I add an entry in the > service names in addition to "com.sun.star.frame.ProtocolHandler"? If > yes, what value should I provide? Is it the fully qualified name of > the main class?
You didn't do anything wrong, a ProtocolHandler is supposed to be instantiated and initialized on a per Frame/UI element controller basis (that is, add your command to a toolbar item and a menu bar item, then you'll find that the component gets instantiated twice, or even more). You can design UNO components as singletons, make the component factory return always the same instance, etc.; but in this case, the ProtocolHandler was not designed for that; it is better to implement the singleton patter in another class. You have different options: - it is a better practice to separate the implementation from the ProtocolHandler and the Dispatch object (I assume you are implementing both in the same class, and queryDispatch/es returns this) so that you have different roles and responsibilities; you can make the ProtocolHandle's return always the same dispatch object per Frame so that you have a n-1 relationship - implement the singleton pattern on a helper class that handles all the recent documents handling How are you tracking the recent documents? The ProtocolHandler is not the place to do that ;) Regards -- Ariel Constenla-Haile La Plata, Argentina
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