Examples of org.apache.openjpa.datacache.QueryCache

org.apache.openjpa.datacache.QueryCache
Interface that must be implemented by any level 2 query cache used by OpenJPA. These methods should be threadsafe. Most query cache implementations will probably implement {@link org.apache.openjpa.lib.conf.Configurable} to receive a handle to thesystem configuration on construction. @since 0.2.5 @author Patrick Linskey

                releaseConn = _connRetainMode != CONN_RETAIN_ALWAYS;
                if (rollback)
                    _store.rollback();
                else {
                    // and notify the query cache.  notify in one batch to reduce synch
                    QueryCache queryCache = getConfiguration().
                    getDataCacheManagerInstance().getSystemQueryCache();
                    if (queryCache != null) {
                        Collection<Class<?>> pers = getPersistedTypes();
                        Collection<Class<?>> del = getDeletedTypes();
                        Collection<Class<?>> up = getUpdatedTypes();
                        int size = pers.size() + del.size() + up.size();
                        if (size > 0) {
                            Collection<Class<?>> types = new ArrayList<Class<?>>(size);
                            types.addAll(pers);
                            types.addAll(del);
                            types.addAll(up);
                            queryCache.onTypesChanged(new TypesChangedEvent(this, types));
                        }
                    } 
                    _store.commit();
                }
            } else {

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        StoreQuery sq = newStoreQuery(language); 
        if (sq == null || QueryLanguages.parserForLanguage(language) == null) {
            return sq;
        }


        QueryCache queryCache = _ctx.getConfiguration().getDataCacheManagerInstance().getSystemQueryCache();
        if (queryCache == null) {
            return sq;
        }
        
        return new QueryCacheStoreQuery(sq, queryCache);

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    public void testBasicQuery() {
        basicQueries(factory.createEntityManager(), Boolean.FALSE, 3, 1);
        basicQueries(factory.createEntityManager(), Boolean.TRUE, 3, 1);


        // manually notify the cache of changes
        QueryCache cache = cacheManager(factory).getSystemQueryCache();


        // test to see if modifying B causes A's query cache to be flushed
        Set s = new HashSet();
        s.add(CacheObjectB.class);
        cache.onTypesChanged(new TypesChangedEvent(this, s));
        basicQueries(factory.createEntityManager(), Boolean.TRUE, 3, 1);


        // test to see if modifying A causes A's query cache to be flushed
        s.add(CacheObjectA.class);
        cache.onTypesChanged(new TypesChangedEvent(this, s));
        basicQueries(factory.createEntityManager(), Boolean.FALSE, 3, 1);


        // make sure that non-manual notification works
        EntityManager em = factory.createEntityManager();
        try {

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    public void testBasicQuery() {
        basicQueries(factory.createEntityManager(), Boolean.FALSE, 3, 1);
        basicQueries(factory.createEntityManager(), Boolean.TRUE, 3, 1);


        // manually notify the cache of changes
        QueryCache cache = cacheManager(factory).getSystemQueryCache();


        // test to see if modifying B causes A's query cache to be flushed
        Set s = new HashSet();
        s.add(CacheObjectB.class);
        cache.onTypesChanged(new TypesChangedEvent(this, s));
        basicQueries(factory.createEntityManager(), Boolean.TRUE, 3, 1);


        // test to see if modifying A causes A's query cache to be flushed
        s.add(CacheObjectA.class);
        cache.onTypesChanged(new TypesChangedEvent(this, s));
        basicQueries(factory.createEntityManager(), Boolean.FALSE, 3, 1);


        // make sure that non-manual notification works
        EntityManager em = factory.createEntityManager();
        try {

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                releaseConn = _connRetainMode != CONN_RETAIN_ALWAYS;
                if (rollback)
                    _store.rollback();
                else {
                    // and notify the query cache.  notify in one batch to reduce synch
                    QueryCache queryCache = getConfiguration().
                    getDataCacheManagerInstance().getSystemQueryCache();
                    if (queryCache != null) {
                        Collection<Class<?>> pers = getPersistedTypes();
                        Collection<Class<?>> del = getDeletedTypes();
                        Collection<Class<?>> up = getUpdatedTypes();
                        int size = pers.size() + del.size() + up.size();
                        if (size > 0) {
                            Collection<Class<?>> types = new ArrayList<Class<?>>(size);
                            types.addAll(pers);
                            types.addAll(del);
                            types.addAll(up);
                            queryCache.onTypesChanged(new TypesChangedEvent(this, types));
                        }
                    } 
                    _store.commit();
                }
            } else {

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        StoreQuery sq = newStoreQuery(language); 
        if (sq == null || QueryLanguages.parserForLanguage(language) == null) {
            return sq;
        }


        QueryCache queryCache = _ctx.getConfiguration().getDataCacheManagerInstance().getSystemQueryCache();
        if (queryCache == null) {
            return sq;
        }
        
        return new QueryCacheStoreQuery(sq, queryCache);

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    @Override
    public void initialize() {
        
        OpenJPAConfiguration conf = (OpenJPAConfiguration)getProvider().getConfiguration();
        DataCacheManager dcm = conf.getDataCacheManagerInstance();
        QueryCache qc = dcm.getSystemQueryCache();
        
        if (qc == null) {
            throw new UserException(_loc.get("query-cache-not-found"));
        }

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        StoreQuery sq = newStoreQuery(language); 
        if (sq == null || QueryLanguages.parserForLanguage(language) == null) {
            return sq;
        }


        QueryCache queryCache = _ctx.getConfiguration().getDataCacheManagerInstance().getSystemQueryCache();
        if (queryCache == null) {
            return sq;
        }
        
        return new QueryCacheStoreQuery(sq, queryCache);

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        StoreQuery sq = newStoreQuery(language); 
        if (sq == null || QueryLanguages.parserForLanguage(language) == null) {
            return sq;
        }


        QueryCache queryCache = _ctx.getConfiguration().getDataCacheManagerInstance().getSystemQueryCache();
        if (queryCache == null) {
            return sq;
        }
        
        return new QueryCacheStoreQuery(sq, queryCache);

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     * results in AbstractQueryCache.onTypesChanges(TypesChangedEvent) being called.
     * 
     * @throws Exception
     */
    public void testWriteLock() throws Exception {
        final QueryCache qc = emf.getConfiguration().getDataCacheManagerInstance().getSystemQueryCache();
        Thread t2 = new Thread() {
            public void run() {
                qc.writeLock();
                qc.writeUnlock();
            }
        };
        t2.start();
        t2.join(5000);

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