Question

我有Jboss AS 6.1以及war和sar应用程序。我用cassandra。所以我需要管理员访问数据库和缓存数据库对象以便快速访问。所以我这样做了：

    public class AsaBlackSubsManager extends OperatorsCache<AsaBlackSubs> {
    private final static Logger log = Logger.getLogger(AsaBlackSubsManager.class);
    private final static String CF_NAME = "asa_black_subs";
    private static AsaBlackSubsManager instance = null;
    private MsisdnManager msisdnManager;

    private AsaBlackSubsManager() {
        reload();
        msisdnManager = new MsisdnManager();
    }

    public static AsaBlackSubsManager getInstance() {
        if (instance == null) {
            instance = new AsaBlackSubsManager();
        }
        return instance;
    }

    public List<AsaBlackSubs> list() {
        final List<AsaBlackSubs> list = new ArrayList<>();
        final Statement query = QueryBuilder.select().from(CF_NAME);
        final ResultSet rows = BasicManager.getInstance().getSession().execute(query);
        for (final Row row : rows) {
            if (row != null && row.getString("name") != null) {
                final AsaBlackSubs subs = new AsaBlackSubs();
                subs.setId(row.getUUID("id").toString());
                subs.setName(row.getString("name"));
                subs.setOperatorId(row.getString("operatorId"));
                subs.setParams(row.getString("params"));
                subs.setDescription(row.getString("description"));
                subs.setParentId(row.getString("parentId"));
                subs.setOwner(row.getString("owner"));
                list.add(subs);
            }
        }
        Collections.sort(list, new HierarchyObjectComparator());
        return list;
    }

    public String create(final AsaBlackSubs subs) {
        if (subs.getId() == null) {
            final UUID uuid = UUID.randomUUID();
            subs.setId(uuid.toString());
        }
        final Insert query = QueryBuilder.insertInto(CF_NAME)
                .value("id", UUID.fromString(subs.getId()))
                .value("name", subs.getName())
                .value("operatorId", subs.getOperatorId())
                .value("params", subs.getParams())
                .value("description", subs.getDescription())
                .value("owner", subs.getOwner())
                .value("parentId", subs.getParentId());
        BasicManager.getInstance().getSession().execute(query);
        reload();
        return subs.getId();
    }

}

此外，我还有抽象缓存类，其中我的对象被缓存并按运算符排序。

public abstract class OperatorsCache<T extends OperatoredObject> {

    protected List<T> cache;
    protected Map<String, List<T>> mapByOperator;

    public abstract List<T> list();

    public void reload() {
        cache = new CopyOnWriteArrayList<>(list());
        mapByOperator = cache.parallelStream()
                .collect(Collectors.groupingBy(OperatoredObject::getOperatorId));
    }

    public List<T> cachedList() {
        return new ArrayList<>(cache);
    }

    public List<T> cachedListByOperator(final String operatorId) {
        return mapByOperator.getOrDefault(operatorId, new ArrayList<>());
    }

    public T get(final String id) {
        final Optional<T> any = cache
                .parallelStream()
                .filter(obj -> obj.getId().equals(id))
                .findAny();
        return any.isPresent() ? any.get() : null;
    }

}

所以通过这种方式我可以从战争和sar访问我的类，从任何地方和缓存都是一样的。此缓存只有一个对象。经理班本身就在这里。这是一个相当不错的方法，但我知道单身的弱点，所以我决定用焊接依赖注入替换我的单例，它集成在Jboss中。我是这样做的：删除私有构造函数和getInstance（）方法并添加@ApplicationScope注释。在我的网络课程中，我只是注释@Inject。像这样：

public class CreateAsaSubsb extends BaseAction {


    @Inject
    AsaBlackSubsManager manager;

    public void perform(final HttpServletRequest request,
                        final HttpServletResponse response, final JSONObject jsonObject) throws ServletException, IOException, JSONException
...

但是当我尝试启动所有这些时，war应用程序无法启动，我有这样的例外： org.jboss.weld.exceptions.DeploymentException：WELD-001408类型[AsaBlackSubsManager]的不满意依赖关系，注入点[@ field] @Inject

的限定符[@Default]

我几天都在寻找答案，但我仍然可以弄清楚：我做错了什么？

Answer 1

JBoss AS 6是一个Java EE 6应用服务器。根据{{3}}（它是Java EE 6的一部分），您必须在您的存档中放置一个beans.xml文件：在WEB-INF /目录中进行战争，在META-INF /目录中一个罐子。

从singleton迁移到java ee注入

1 个答案: