// JoinBucketLoaders - joins multiple bucket loaders into a single loader,
// similar to `JoinLoaders`.
func JoinBucketLoaders(loaders ...BucketMetricsLoaderFn) BucketMetricsLoaderFn {
	return func(ctx context.Context, m MetricValues, c *metricsCache, b []string) error {
		for _, loader := range loaders {
			if err := loader(ctx, m, c, b); err != nil {
				return err
			}
		}
		return nil
	}

            if (null == value && implType.isInterface() && configuration.getChildCount() == 0) {
                return null; // nothing to process
            }
            final Object bean = instantiateObject(implType);
            if (null == value) {
                processConfiguration(lookup, bean, loader, configuration, evaluator, listener);
            } else {

     * @see java.lang.ClassLoader#getResources(String)
     */
    public static Iterator<URL> getResources(final ClassLoader loader, final String name) {
        assertArgumentNotNull("loader", loader);
        assertArgumentNotEmpty("name", name);

        try {
            final Enumeration<URL> e = loader.getResources(name);
            return new EnumerationIterator<>(e);
        } catch (final IOException e) {

    CountingLoader loader = new CountingLoader();
    LocalCache<Object, Object> map = makeLocalCache(createCacheBuilder());
    assertEquals(0, loader.getCount());

    Object key = new Object();
    Object value = map.get(key, loader);
    assertEquals(1, loader.getCount());
    assertEquals(value, map.get(key, loader));
    assertEquals(1, loader.getCount());
  }

    CountingLoader loader = new CountingLoader();
    LocalCache<Object, Object> map = makeLocalCache(createCacheBuilder());
    assertEquals(0, loader.getCount());

    Object key = new Object();
    Object value = map.get(key, loader);
    assertEquals(1, loader.getCount());
    assertEquals(value, map.get(key, loader));
    assertEquals(1, loader.getCount());
  }

configuration attributes on the instantiated LogFactory instance. Once an implementation class name is selected, the corresponding class is loaded from the current Thread context class loader (if there is one), or from the class loader that loaded the LogFactory class itself otherwise. This allows a copy of commons-logging.jar to be shared in a multiple class loader environment (such as a servlet container), but still allow each web application to provide its own LogFactory implementation, if it so desires....

            ExpressionEvaluator evaluator,
            ClassLoader loader,
            ConfigurationListener listener)
            throws ComponentConfigurationException {
        new EnhancedConfigurationConverter()
                .processConfiguration(
                        converterLookup,
                        component,
                        loader, //
                        configuration,
                        evaluator,

  private final CacheLoader<? super K, V> loader;
  private final RemovalListener<? super K, ? super V> removalListener;
  private final StatsCounter statsCounter;
  private final Ticker ticker;
  private final long expireAfterWrite;
  private final long expireAfterAccess;

  LocalCache(CacheBuilder<? super K, ? super V> builder, CacheLoader<? super K, V> loader) {
    this.loader = loader;
    this.removalListener = builder.removalListener;

     *            リソースの拡張子
     * @param loader
     *            リソースを検索するクラスローダ。{@literal null}であってはいけません
     * @return リソース
     * @see #getResourcePath(String, String)
     */
    public static URL getResourceNoException(final String path, final String extension, final ClassLoader loader) {
        assertArgumentNotNull("loader", loader);

        if (path == null || loader == null) {
            return null;
        }

     */
    @SuppressWarnings("unchecked")
    public static <T> Class<T> forName(final String className, final ClassLoader loader) throws ClassNotFoundRuntimeException {
        assertArgumentNotEmpty("className", className);
        try {
            return (Class<T>) Class.forName(className, true, loader);
        } catch (final ClassNotFoundException e) {
            throw new ClassNotFoundRuntimeException(e);
        }
    }