Re: [mdr-users] Using transient storage

Hi Frank,

    We have exactly the same scenario. What we do in each iteration is 
to create a RefPackage, perform the translation, and then delete the 
RefPackage. In this way we do not need to (re)initialize the whole 
repository (load metamodel, etc.) time and again.

     Leo

PS.: Our repository is an in memory repository. We start it using the 
following code:

Map<String,String> properties = new HashMap<String,String>();
properties.put("storage", 
"org.netbeans.mdr.persistence.memoryimpl.StorageFactoryImpl");
properties.put(StorageFactoryImpl.STORAGE_ID, 
String.valueOf(System.currentTimeMillis()));
repository = new NBMDRepositoryImpl(properties);   

Frank Finger escreveu:
> I'm using Netbeans MDR to transform a proprietary model format to UML 
> XMI (standalone). In every run of the transformation, I want to build 
> the model from scratch, export it, and throw the repository away 
> afterwards. That's why I thought that ...memoryimpl.StorageFactoryImpl 
> would be the storage implementation to use.
> A single export works fine, but when exporting twice I run into 
> exceptions. The same exceptions can be produced by the piece of source 
> code below.
> From a quick look at ...mdr.persistence.memoryimpl.StorageImpl, I 
> thought that not assigning STORAGE_ID values would lead to independent 
> repositories.
>
>
> public static void main( String[] args ) throws Exception
> {
>   Map properties = new HashMap();
>   properties.put(
>     "storage",
>     "org.netbeans.mdr.persistence.memoryimpl.StorageFactoryImpl"
>   );
>   // I'm not setting the STORAGE_ID.
>   // properties.put( StorageFactoryImpl.STORAGE_ID, ... );
>
>   MDRepository firstRepository = new NBMDRepositoryImpl( properties );
>   System.out.println(
>     "firstRepository extents: "+
>     Arrays.asList( firstRepository.getExtentNames() )
>   );
>   MDRepository secondRepository = new NBMDRepositoryImpl( properties );
>   // following line throws exception:
>   System.out.println(
>     "secondRepository extents: "+
>     Arrays.asList( secondRepository.getExtentNames() )
>   );
> }
>
> The stack trace of the exception is:
> org.netbeans.mdr.util.DebugException: Missing storage files or 
> different storage version.
>   at ...storagemodel.MdrStorage.initializeIndexes(MdrStorage.java:507)
>   at ...storagemodel.MdrStorage.rollback(MdrStorage.java:554)
>   at ...util.TransactionMutex.end(TransactionMutex.java:73)
>   at ...util.MultipleReadersMutex.leave(MultipleReadersMutex.java:173)
>   at ...NBMDRepositoryImpl.endTrans(NBMDRepositoryImpl.java:249)
>   at ...NBMDRepositoryImpl.boot(NBMDRepositoryImpl.java:1331)
>   at ...NBMDRepositoryImpl.initCheck(NBMDRepositoryImpl.java:758)
>   at ...NBMDRepositoryImpl.getExtentNames(NBMDRepositoryImpl.java:347)
>   at Main.main(Main.java:58) /* ="secondRepository.getExtentNames()" */
>
>
> Can anybody tell me what I'm doing wrong?
>
> Thanks in advance,
> Frank
>