/**
   * There is a possible case that methods of particular object should be executed with classpath
   * different from the one implied by the current class' class loader. External system offers
   * {@link ParametersEnhancer#enhanceLocalProcessing(List)} method for defining that custom
   * classpath.
   *
   * <p>It's also possible that particular implementation of {@link ParametersEnhancer} is compiled
   * using dependency to classes which are provided by the {@link
   * ParametersEnhancer#enhanceLocalProcessing(List) expanded classpath}. E.g. a class <code>'A'
   * </code> might use method of class <code>'B'</code> and 'A' is located at the current
   * (system/plugin) classpath but <code>'B'</code> is not. We need to reload <code>'A'</code> using
   * its expanded classpath then, i.e. create new class loaded with that expanded classpath and load
   * <code>'A'</code> by it.
   *
   * <p>This method allows to do that.
   *
   * @param clazz custom classpath-aware class which instance should be created (is assumed to have
   *     a no-args constructor)
   * @param <T> target type
   * @return newly created instance of the given class loaded by custom classpath-aware loader
   * @throws IllegalAccessException as defined by reflection processing
   * @throws InstantiationException as defined by reflection processing
   * @throws NoSuchMethodException as defined by reflection processing
   * @throws InvocationTargetException as defined by reflection processing
   * @throws ClassNotFoundException as defined by reflection processing
   */
  @NotNull
  public static <T extends ParametersEnhancer> T reloadIfNecessary(@NotNull final Class<T> clazz)
      throws IllegalAccessException, InstantiationException, NoSuchMethodException,
          InvocationTargetException, ClassNotFoundException {
    T instance = clazz.newInstance();
    List<URL> urls = ContainerUtilRt.newArrayList();
    instance.enhanceLocalProcessing(urls);
    if (urls.isEmpty()) {
      return instance;
    }

    final ClassLoader baseLoader = clazz.getClassLoader();
    Method method = baseLoader.getClass().getMethod("getUrls");
    if (method != null) {
      //noinspection unchecked
      urls.addAll((Collection<? extends URL>) method.invoke(baseLoader));
    }
    UrlClassLoader loader =
        new UrlClassLoader(UrlClassLoader.build().urls(urls).parent(baseLoader.getParent())) {
          @Override
          protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
            if (name.equals(clazz.getName())) {
              return super.loadClass(name, resolve);
            } else {
              try {
                return baseLoader.loadClass(name);
              } catch (ClassNotFoundException e) {
                return super.loadClass(name, resolve);
              }
            }
          }
        };
    //noinspection unchecked
    return (T) loader.loadClass(clazz.getName()).newInstance();
  }
Пример #2
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  private static List<BaseInjection> loadDefaultInjections() {
    final ArrayList<Configuration> cfgList = new ArrayList<Configuration>();
    final THashSet<Object> visited = new THashSet<Object>();
    for (LanguageInjectionConfigBean configBean :
        Extensions.getExtensions(LanguageInjectionSupport.CONFIG_EP_NAME)) {
      PluginDescriptor descriptor = configBean.getPluginDescriptor();
      final ClassLoader loader = descriptor.getPluginClassLoader();
      try {
        final Enumeration<URL> enumeration = loader.getResources(configBean.getConfigUrl());
        if (enumeration == null || !enumeration.hasMoreElements()) {
          LOG.warn(descriptor.getPluginId() + ": " + configBean.getConfigUrl() + " was not found");
        } else {
          while (enumeration.hasMoreElements()) {
            URL url = enumeration.nextElement();
            if (!visited.add(url.getFile())) continue; // for DEBUG mode
            try {
              cfgList.add(load(url.openStream()));
            } catch (Exception e) {
              LOG.warn(e);
            }
          }
        }
      } catch (Exception e) {
        LOG.warn(e);
      }
    }

    final ArrayList<BaseInjection> defaultInjections = new ArrayList<BaseInjection>();
    for (String supportId : InjectorUtils.getActiveInjectionSupportIds()) {
      for (Configuration cfg : cfgList) {
        final List<BaseInjection> imported = cfg.getInjections(supportId);
        defaultInjections.addAll(imported);
      }
    }
    return defaultInjections;
  }