private void loadFile()

in common/src/main/java/org/apache/seata/common/loader/EnhancedServiceLoader.java [569:628]
59 lines of code
16 McCabe index (conditional complexity)

        private void loadFile(String dir, Class type, ClassLoader loader, List<ExtensionDefinition<S>> extensions)
                throws IOException {
            String fileName = dir + type.getName();
            Enumeration<java.net.URL> urls;
            if (loader != null) {
                urls = loader.getResources(fileName);
            } else {
                urls = ClassLoader.getSystemResources(fileName);
            }
            if (urls != null) {
                boolean hasServiceFile = false;
                boolean hasClasses = false;
                while (urls.hasMoreElements()) {
                    hasServiceFile = true;
                    java.net.URL url = urls.nextElement();
                    try (BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream(), Constants.DEFAULT_CHARSET))) {
                        String line;
                        while ((line = reader.readLine()) != null) {
                            final int ci = line.indexOf('#');
                            if (ci >= 0) {
                                line = line.substring(0, ci);
                            }
                            line = line.trim();
                            if (line.length() > 0) {
                                hasClasses = true;
                                try {
                                    ExtensionDefinition<S> extensionDefinition = getUnloadedExtensionDefinition(line, loader);
                                    if (extensionDefinition == null) {
                                        if (LOGGER.isDebugEnabled()) {
                                            LOGGER.debug("The same extension {} has already been loaded, skipped", line);
                                        }
                                        continue;
                                    }
                                    extensions.add(extensionDefinition);
                                } catch (LinkageError | ClassNotFoundException e) {
                                    LOGGER.warn("Load [{}] class fail: {}", line, e.getMessage());
                                } catch (ClassCastException e) {
                                    LOGGER.error("Load [{}] class fail, please make sure the extension" +
                                            " config in {} implements {}.", line, fileName, type.getName());
                                }
                            }
                        }
                    } catch (Throwable e) {
                        LOGGER.warn("load class instance error:", e);
                    }
                }

                if (LOGGER.isDebugEnabled()) {
                    if (!hasServiceFile) {
                        LOGGER.warn("Load [{}] class fail: no service files found in '{}'.", type.getName(), dir);
                    } else if (!hasClasses) {
                        LOGGER.warn("Load [{}] class fail: the service files in '{}' is all empty.", type.getName(), dir);
                    }
                }
            } else {
                if (LOGGER.isDebugEnabled()) {
                    LOGGER.warn("Load [{}] class fail: no urls found in '{}'.", type.getName(), dir);
                }
            }
        }