Examples of org.datanucleus.metadata.MetaDataManager

org.datanucleus.metadata.MetaDataManager
Manager of metadata information in DataNucleus having scope of an ObjectManagerFactory. Each PMF/EMF will effectively have a single MetaDataManager handling all XML/Annotations metadata.
Metadata can be loaded into the MetaDataManager in two ways
- Load when required. When the persistence process needs a class it will ask for metadata, and we can go and find its metadata from XML/annotations.
- Load explicitly via API calls. This happens when handling persistence for a persistence-unit for example since we know what classes/mapping is involved. It is also the case with the enhancer where we know what classes to enhance so we load the metadata first
Acts as a registry of metadata so that metadata files don't need to be parsed multiple times. MetaData is stored as a FileMetaData, which contains PackageMetaData, which contains ClassMetaData, and so on. This maps exactly to the users model of their metadata. The users access point is getMetaDataForClass() which will check the known classes without metadata, then check the existing registered metdata, then check the valid locations for metdata files. This way, the metadata is managed from this single point.

Maintains a list of all classes that have been checked for MetaData and don't have any available. This avoids the needs to look up MetaData multiple times finding the same result. Currently this list is for all ClassMetaData objects keyed by the class name.

Users can register interest in knowing when metadata for classes are loaded by registering a listener using the addListener method. This will then notify the listener when metadata for any class is initialised. This provides the opportunity to reject the metadata where particular features are not supported. For example a StoreManager could register a listener where it doesn't support datastore identity and throw an InvalidMetaDataException. This would then filter back out to the user for the operation they invoked

     * metadata defined for that class.
     * @return The metadata
     */
    public javax.jdo.metadata.TypeMetadata getMetadata(String className)
    {
        MetaDataManager mmgr = omfContext.getMetaDataManager();
        AbstractClassMetaData acmd = mmgr.getMetaDataForClass(className, 
            omfContext.getClassLoaderResolver(null));
        if (acmd == null)
        {
            return null;
        }

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                StringUtils.objectArrayToString(types)));
        }


        // Check if classes are detachable
        OMFContext omfCtxSource = ((JDOPersistenceManagerFactory)pmfSource).getOMFContext();
        MetaDataManager mmgr = omfCtxSource.getMetaDataManager();
        ClassLoaderResolver clr = omfCtxSource.getClassLoaderResolver(null);
        for (int i=0;i<types.length;i++)
        {
            AbstractClassMetaData cmd = mmgr.getMetaDataForClass(types[i], clr);
            if (!cmd.isDetachable())
            {
                throw new JDOUserException("Class " + types[i] + " is not detachable so cannot replicate");
            }
        }


        Object[] detachedObjects = null;


        // Detach from datastore 1
        if (NucleusLogger.PERSISTENCE.isDebugEnabled())
        {
            NucleusLogger.PERSISTENCE.debug(LOCALISER_JDO.msg("012053"));
        }
        PersistenceManager pm1 = pmfSource.getPersistenceManager();
        Transaction tx1 = pm1.currentTransaction();
        if (getBooleanProperty("datanucleus.replicateObjectGraph"))
        {
            pm1.getFetchPlan().setGroup(javax.jdo.FetchPlan.ALL);
            pm1.getFetchPlan().setMaxFetchDepth(-1);
        }
        try
        {
            tx1.begin();


            ArrayList objects = new ArrayList();
            for (int i=0;i<types.length;i++)
            {
                AbstractClassMetaData cmd = mmgr.getMetaDataForClass(types[i], clr);
                if (!cmd.isEmbeddedOnly())
                {
                    Extent ex = pm1.getExtent(types[i]);
                    Iterator iter = ex.iterator();
                    while (iter.hasNext())

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                StringUtils.objectArrayToString(classNames)));
        }


        // Check if classes are detachable
        OMFContext omfCtxSource = ((JDOPersistenceManagerFactory)pmfSource).getOMFContext();
        MetaDataManager mmgr = omfCtxSource.getMetaDataManager();
        ClassLoaderResolver clr = omfCtxSource.getClassLoaderResolver(null);
        for (int i=0;i<classNames.length;i++)
        {
            AbstractClassMetaData cmd = mmgr.getMetaDataForClass(classNames[i], clr);
            if (!cmd.isDetachable())
            {
                throw new JDOUserException("Class " + classNames[i] + " is not detachable so cannot replicate");
            }
        }


        Object[] detachedObjects = null;


        // Detach from datastore 1
        if (NucleusLogger.PERSISTENCE.isDebugEnabled())
        {
            NucleusLogger.PERSISTENCE.debug(LOCALISER_JDO.msg("012053"));
        }
        PersistenceManager pm1 = pmfSource.getPersistenceManager();
        Transaction tx1 = pm1.currentTransaction();
        if (getBooleanProperty("datanucleus.replicateObjectGraph"))
        {
            pm1.getFetchPlan().setGroup(javax.jdo.FetchPlan.ALL);
            pm1.getFetchPlan().setMaxFetchDepth(-1);
        }
        try
        {
            tx1.begin();


            clr = ((JDOPersistenceManager)pm1).getObjectManager().getClassLoaderResolver();
            ArrayList objects = new ArrayList();
            for (int i=0;i<classNames.length;i++)
            {
                Class cls = clr.classForName(classNames[i]);
                AbstractClassMetaData cmd = mmgr.getMetaDataForClass(cls, clr);
                if (!cmd.isEmbeddedOnly())
                {
                    Extent ex = pm1.getExtent(cls);
                    Iterator iter = ex.iterator();
                    while (iter.hasNext())

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     * Method to perform the replication for all objects registered in the pmf source.
     */
    public void replicateRegisteredClasses()
    {
        ClassLoaderResolver clr = ((JDOPersistenceManager)pmfSource.getPersistenceManager()).getObjectManager().getClassLoaderResolver();
        MetaDataManager mmgr = ((JDOPersistenceManagerFactory)pmfSource).getOMFContext().getMetaDataManager();
        Collection classNames = mmgr.getClassesWithMetaData();
        ArrayList arrayTypes = new ArrayList();


        Iterator iterator = classNames.iterator();
        while (iterator.hasNext())
        {
            String className = (String) iterator.next();
            AbstractClassMetaData cmd = mmgr.getMetaDataForClass(className, clr);
            if (!cmd.isEmbeddedOnly()) // Omit embedded-only classes since can't replicate those
            {
                arrayTypes.add(clr.classForName(className));
            }
        }

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        {
            return null;
        }


        JDOPersistenceManagerFactory myPMF = (JDOPersistenceManagerFactory)pmf;
        MetaDataManager mdmgr = myPMF.getOMFContext().getMetaDataManager();
        return (ClassMetaData)mdmgr.getMetaDataForClass(cls, myPMF.getOMFContext().getClassLoaderResolver(null));
    }

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