While creating a presentation about scripting Apache OpenOffice (AOO) for the
upcoming ApacheCon
Europe (next week), I have been intensively exploring various AOO APIs in order
to help the
attendants to conduct an easier life when creating scripts/programs to drive
AOO wordprocessor
("swriter"), spreadsheet ("scalc"), presentation ("simpress").
The AOO support for ooRexx is based on BSF4ooRexx utilizing the Java
APIs/interfaces of AOO. In
order to ease the ooRexx programmer's life there is an own package UNO.CLS
(bridge to/from AOO)
created which requires BSF.CLS (bridge to/from Java). In this context there are
Java callbacks
(implemented as Java Proxy objects) to wrapped ooRexx object defined.
In the case that a runtime error occurs and ooRexx terminates/shuts down it may
sometimes be the
case that a Java finalize method on the proxied ooRexx objects executes and
causes a callback into
the ooRexx instance, which may not be stable anymore. This use-case
unfortunately results in ooRexx
crashes!
The reason is that for this particular use-case there is currently no
possibility at the native
interface level to learn whether an ooRexx interpreter instance is still safe
to be used or not.
Short of such a functionality the callback is carried out in any case as it
usually only leads to an
ooRexx crash if the ooRexx programs abends unexpectedly.
The only remedy for this situation is an ability to learn via the ooRexx native
interface about the
state of the ooRexx interpreter instance, such that one can react accordingly:
if the interpreter
instance is alive, carry out the callback into ooRexx, otherwise raise an
exception in Java to
inform that the interpreter instance is not available anymore.
In the past there were two different RFEs created to address this problem one
way or another:
* https://sourceforge.net/p/oorexx/feature-requests/435/
* https://sourceforge.net/p/oorexx/feature-requests/356/
Any other solution would be fine as well, if it helps to solve this "ooRexx
crash" (popup) problem,
which gives the impression to the programmer/user that ooRexx is unstable!
---rony
P.S.: With the Allura voting ability I tried to make these RFEs visible by
voting for these RFEs.
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