摘抄spring源码中的Java工具类的代码片段

/**
 * Load a {@link ClassPathResource} qualified by the simple name of clazz,
 * and relative to the package for clazz.
 * <p>Example: given a clazz 'com.foo.BarTests' and a resourceSuffix of 'context.xml',
 * this method will return a ClassPathResource representing com/foo/BarTests-context.xml
 * <p>Intended for use loading context configuration XML files within JUnit tests.
 */
public static ClassPathResource qualifiedResource(Class<?> clazz, String resourceSuffix) {
   return new ClassPathResource(String.format("%s-%s", clazz.getSimpleName(), resourceSuffix), clazz);
}

private final Set<String> singletonsCurrentlyInCreation =
      Collections.newSetFromMap(new ConcurrentHashMap<>(16));