On 11/22/06, Stephan Bergmann <[EMAIL PROTECTED]> wrote:
Tabish F. Mufti wrote:
[...]
> # compile
> idlc -C -I. -I${SDK_DIR}/idl -O${WorkDir} theSentence.idl
> idlc -C -I. -I${SDK_DIR}/idl -O${WorkDir} XSentence.idl
>
> # create registory database (.rdb)
> regmerge ${WorkDir}/ex_comp.rdb /UCR ${WorkDir}/theSentence.urd
> regmerge ${WorkDir}/ex_comp.rdb /UCR ${WorkDir}/XSentence.urd
>
> # view a registry database
> #regview ${WorkDir}/ex_comp.rdb
>
> # generate java souce file for new types from rdb
> javamaker -BUCR -nD \
> -Tcom.sun.star.ex.comp.XSentence \
> ${OOo_DIR}/program/types.rdb \
> -O${WorkDir} \
> ${WorkDir}/ex_comp.rd
>
> I had all the above but there was a slight mistake somewhere. Anywayz it
> compiled & packaged was deployed.
>
> Now I get an exception on this line:
>
> com.sun.star.ex.comp.XSentence sentence =
> com.sun.star.ex.comp.theSentence.get(xContext);
>
> In queryDispatch in ProtocolHandler: myInput:
> com.sun.star.uno.DeploymentException: component context fails to supply
> singleton com.sun.star.ex.comp.theSentence of type
> com.sun.star.ex.comp.XSentence
> at com.sun.star.ex.comp.theSentence.get(Unknown Source)
> at
com.sun.star.ex.comp.SentenceProtocolHandler$OwnDispatch.dispatch
> (SentenceProtocolHandler.java:129)
>
OK, I see your problem. Singletons (and services) have three parts:
First, you need a UNOIDL file containing the singleton's "declaration"
(i.e., containing a line like "singleton theSentence: XSentence;", as
your theSentence.idl). From that, javamaker creates a helper class
(theSentence.class) that allows client code to obtain the singleton
instance at runtime, *if certain conditions are met.*
Second, there needs to be a "definition" of the singleton (i.e., for
example a Java class you provide that implements the XSentence interface
and also provides code to register the singleton implementation with a
component context). How the necessary code to register a *service*
implementation looks like is described in the DevGuide
(<http://api.openoffice.org/docs/DevelopersGuide/DevelopersGuide.pdf>),
sections 4.5.3--4.5.5); however, a description of the necessary code for
a *singleton* implementation seems to be missing. [*]
Third (and this is where the "certain conditions" from above are
provided), a call to theSentence.get(componentContext) will only succeed
if componentContext is a component context in which the "definition" of
the singleton (the Java class you need to provide) has been registered.
How this registration works depends on the nature of the component
context:
- If the component context is a binary UNO one from the OOo installation
(e.g., obtained from com.sun.star.comp.helper.Bootstrap.bootstrap or
com.sun.star.comp.helper.Bootstrap.defaultBootstrap_InitialComponentContext
),
the singleton must be registered in the OOo services.rdb (for example
via regcomp, see the DevGuide for details).
- If the component context is a pure Java UNO one (e.g., obtained from
com.sun.star.comp.helper.Bootstrap.createInitialComponentContext), you
have to register the singleton directly at the component context "by
hand." Again, how this is done seems not to be well documented. [**]
Please allow me some more time to come back with example code that sheds
more light on how [*] and [**] actually work.
-Stephan
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Ok, what I can request to you write now is to make a simple HelloWorld
singleton. e.g. a singleton having a function which when called increments a
counter inside it and return the value. I think we'll need two files for
this (something like XSentence.idl and an implementation of XSentence)
Together with all the above, make the Build.sh file which will be used to
package & deploy that component. And put all of this on a wiki. If you need
any kind of help, let me know although I'm pretty new to openoffice
development.
Thanks
