On Thu, Nov 1, 2012 at 6:46 AM, <devnull2...@gmx.de> wrote:
> public class Foo extends _Foo {
>
> @Inject @Symbol(value="baseDir") // not possible
> String baseDir;
>
> public String getAbsoluteLocalFilepath() {
>
> return baseDir + "/" + toUser.getId() + "/" + getFilename();
> }
> }
>
> The return value is a path to a file. The files get uploaded by users and
> each user has their own folder inside of baseDir. Each foo object has a
> relation to a user object and a field filename.
>
> baseDir is a symbol read from myApp.properties. On the production server it
> could be /var/myApp/userfiles/, on another machine it could be
> /home/username/myApp/userfiles, set in eclipse as VM argument -DbaseDir=...
>
> getAbsoluteLocalFilepath() is called in page classes, e. g. to store a file
> under this path. Another example for a method in Foo could be
> public InlineFileStreamResponse getImageAsStream() ...
> where we also need the baseDir.
>
> The files are uploaded by users. They can't be Assets and we don't want blobs
> in the database.
If you are going to do -DbaseDir=... as a VM argument, why not just
use System.getProperty("baseDir") to read the value? No need to
@Inject it.
>> > The other approach would be to use a servlet filter, which is much
>> > more complex. You'd probably have to register a thread local to bind
>> > your Tapestry symbol values into and then retrieve them inside your
>> > CayenneDataObject subclasses (Foo, Bar, etc) using a lifecycle
>> > callback. I think this approach would be more work and more magic
>> > (harder to implement and understand/maintain later), but if you would
>> > like to explore this avenue instead of a Tapestry service, just ask.
>
> There are few methods like the example above and the baseDir and a second
> value are injected in page classes since the example with the Inject doesn't
> work. Then the baseDir is passed to the method:
> getAbsoluteLocalFilepath(baseDir);
>
>
> If I wrote a TapestryCayenneService, would I have to use it for the creation
> of every Cayenne object? There are 13 classes and only two of them would use
> two injected symbol values.
I think you are trying to do something different that I initially
thought, so I'd skip the service part for now and just keep creating
your Cayenne objects the way you are currently creating them.
mrg
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