xstream多线程实例

Question

我想在多线程环境中处理XML字符串的实例。 但在官方文档中：XStream在配置时不是线程安全的。不幸的是，注释正在定义在处理对象编组时现在应用的配置更改。 所以我想通过Class共享xStream实例。安全吗？ 我想知道使用是否正确。任何建议都表示赞赏。

private static Map<Class<?>, XStream> xStreamMap = Collections.synchronizedMap(new HashMap<Class<?>, XStream>());

private static XStream getXStreamInstance(Class<?> clazz) {
    if (xStreamMap.containsKey(clazz)) {
        return xStreamMap.get(clazz);
    }
    synchronized (clazz) {
        if (xStreamMap.containsKey(clazz)) {
            return xStreamMap.get(clazz);
        }
        XStream xStream = new XStream(new XppDriver(new NoNameCoder()));
        xStream.ignoreUnknownElements();
        xStream.processAnnotations(clazz);
        xStreamMap.put(clazz, xStream);
        return xStream;
    }
}

public static Object fromXML(String xml, final Class type) throws AppExceptionEx {
    try {
        return getXStreamInstance(type).fromXML(xml);
    } catch (XStreamException e) {
        throw new AppExceptionEx(ErrorNum.XML_ERROR,e.getMessage());
    }

}


public static String toXml(Object obj) throws AppExceptionEx {
    try {
        return getXStreamInstance(obj.getClass()).toXML(obj);
    } catch (XStreamException e) {
        throw new AppExceptionEx(ErrorNum.MAKE_XML_ERROR,
                ErrorNum.MAKE_XML_ERROR_MSG);
    }

}