Marcin Miłkowski wrote:
Hi,
I'm implementing a class that implements a known OOo service (actually,
several ones, but the important one is XGrammarChecker). The problem is
that the class is instantiated many times in OOo whenever a UI item is
used, and the instances created do not share data.
Note that com.sun.star.linguistic2.XGrammarChecker is an interface, not
a service.
So I think I should guarantee that the service is instantiated only once
per OOo instance. As far as I understand, I need to make a singleton
class for this purpose. The docs (if one can call it docs) refer to
writing an IDL spec which is not useful for implementing a known UNO
service, so I think in this case writing IDL is completely superfluous.
All I want from the class is that it's created only once per JVM in OOo
(the code is in Java). What should I do to make my class a one-instance
class? Is it enough to add some registry code to
__writeRegistryServiceInfo?
New UNOIDL ("singleton Foo: XBar;") is not needed here---it would
declare that there is a singleton UNO object obtainable with a certain
name at the global component context. Rather, you want to change the
details of a Java implementation of some UNO object.
Your __getServiceFactory method is the place to turn to. Let it return
a com.sun.star.lang.XSingleComponentFactory whose
createInstanceWithContext and createInstanceWithArgumentsAndContext
methods control the number of instances generated (which might be
difficult for example if you need to support non-trivial argument lists,
which I do not know since XGrammarChecker is an interface and not a
service).
However, be aware that XGrammarChecker has methods like startDocument
documented as "This enables the grammar checker to maintain state
information about the document".
-Stephan
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