Hi,
to save the data into the system temp directory (java.io.tmpdir) is not
a good idea. Most Linux distributions runs a clean-tmp job during system
startup! I would prefer the users home directory (user.home). Not the
best solution, but here we have the guaranty, that this directory is
writeable and no data will be removed through any automatic services.
Perhaps we can create a subdirectory "openjump_tmp" in users home and
save the data here. On next OJ startup we can check this directory for
data and inform the user about automatically saved data.
Is this ok?
Matthias
As I know both Kosmo and GvSIG save working data into a temp folder.
This makes easier to restore, at least saved informations, whenever
JAVA VM is killed.
2013/5/31 Michaël Michaud <michael.mich...@free.fr
<mailto:michael.mich...@free.fr>>
Hi Matthias,
Thanks to take care about this.
> I try to fix this problem:
>
http://sourceforge.net/tracker/?func=detail&aid=3613871&group_id=118054&atid=679906
> I've seen, that OJ closes without any warning if you kill the
Java VM
> with the taskmanager or on a Linux shell with the kill command
too. This
> seems to be the same as during OS shutdown. But we can catch
this with a
> Runtime.addShutdownHook(). This is simply a Thead. The Thread is
> executed, during Java VM shutdown.
> I've made some tests with a ShutdownHook in the WorkbenchFrame. If i
> call the closeApplication() method (it's the same as you closing the
> WorkbenchFrame window), then you get only a JOptionPane with the
> possibility to exit OJ or to cancel. The problem for now is,
that we do
> not have a possibillity to stop the Java VM shutdown. This
dialog makes
> no sense here.
> My question is, do we have a "End"-dialog which can save unsafed
data
> automatically?
We have something close to this situation when user try to "save as" a
project
containing layers without datasource.
I did not use this option while closing the application containing
unsaved layer
because I felt that this is not the normal way to save data (only two
formats
available and no possibility to choose the directory where data is
saved).
But for special situation where the main goal is saving, it is OK.
To go one step further and totally cancel the dialog box, my
option would be
- to save data in jml (shapefile can lost information and make
problems
with
heterogeneous geometries)
- to save the project in the system temp directory.
Any other opinion about how to handle this situation ?
Michaël
> Or what should we do with unsaved data in this situation?
> I mean, that we must do fast some things, because the OS do not wait
> infinity during shutdown. Problematic are especially new layers,
without
> a datastore (never saved before). Any "old" or previous saved
layers we
> can save automatically. Is this right in every situation? I
mean, that
> the user should make a decision. But a fast....
>
> Please tell me your opinion.
>
> Matthias
>
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Technologieconsulting
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Siebigeröder Str 17a
06308 Klostermansfeld
T +49 34772 34150
E m...@jammerhund.de
W www.openjump.de
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