Java 类org.springframework.util.ConcurrentReferenceHashMap 实例源码

/**
 * Create a new CachedIntrospectionResults instance for the given class.
 * @param beanClass the bean class to analyze
 * @throws BeansException in case of introspection failure
 */
private CachedIntrospectionResults(Class<?> beanClass) throws BeansException {
    try {
        if (logger.isTraceEnabled()) {
            logger.trace("Getting BeanInfo for class [" + beanClass.getName() + "]");
        }

        BeanInfo beanInfo = null;
        for (BeanInfoFactory beanInfoFactory : beanInfoFactories) {
            beanInfo = beanInfoFactory.getBeanInfo(beanClass);
            if (beanInfo != null) {
                break;
            }
        }
        if (beanInfo == null) {
            // If none of the factories supported the class, fall back to the default
            beanInfo = (shouldIntrospectorIgnoreBeaninfoClasses ?
                    Introspector.getBeanInfo(beanClass, Introspector.IGNORE_ALL_BEANINFO) :
                    Introspector.getBeanInfo(beanClass));
        }
        this.beanInfo = beanInfo;

        if (logger.isTraceEnabled()) {
            logger.trace("Caching PropertyDescriptors for class [" + beanClass.getName() + "]");
        }
        this.propertyDescriptorCache = new LinkedHashMap<String, PropertyDescriptor>();

        // This call is slow so we do it once.
        PropertyDescriptor[] pds = this.beanInfo.getPropertyDescriptors();
        for (PropertyDescriptor pd : pds) {
            if (Class.class == beanClass &&
                    ("classLoader".equals(pd.getName()) ||  "protectionDomain".equals(pd.getName()))) {
                // Ignore Class.getClassLoader() and getProtectionDomain() methods - nobody needs to bind to those
                continue;
            }
            if (logger.isTraceEnabled()) {
                logger.trace("Found bean property '" + pd.getName() + "'" +
                        (pd.getPropertyType() != null ? " of type [" + pd.getPropertyType().getName() + "]" : "") +
                        (pd.getPropertyEditorClass() != null ?
                                "; editor [" + pd.getPropertyEditorClass().getName() + "]" : ""));
            }
            pd = buildGenericTypeAwarePropertyDescriptor(beanClass, pd);
            this.propertyDescriptorCache.put(pd.getName(), pd);
        }

        this.typeDescriptorCache = new ConcurrentReferenceHashMap<PropertyDescriptor, TypeDescriptor>();
    }
    catch (IntrospectionException ex) {
        throw new FatalBeanException("Failed to obtain BeanInfo for class [" + beanClass.getName() + "]", ex);
    }
}