ARouter初始化：

image.png

关键函数：getFileNameByPackageName

/**
     * 通过指定包名，扫描包下面包含的所有的ClassName
     *
     * @param context     U know
     * @param packageName 包名
     * @return 所有class的集合
     */
    public static Set<String> getFileNameByPackageName(Context context, final String packageName) throws PackageManager.NameNotFoundException, IOException, InterruptedException {
        final Set<String> classNames = new HashSet<>();

        List<String> paths = getSourcePaths(context);
        final CountDownLatch parserCtl = new CountDownLatch(paths.size());

        for (final String path : paths) {
            DefaultPoolExecutor.getInstance().execute(new Runnable() {
                @Override
                public void run() {
                    DexFile dexfile = null;

                    try {
                        if (path.endsWith(EXTRACTED_SUFFIX)) {
                            //NOT use new DexFile(path), because it will throw "permission error in /data/dalvik-cache"
                            dexfile = DexFile.loadDex(path, path + ".tmp", 0);
                        } else {
                            dexfile = new DexFile(path);
                        }

                        Enumeration<String> dexEntries = dexfile.entries();
                        while (dexEntries.hasMoreElements()) {
                            String className = dexEntries.nextElement();
                            if (className.startsWith(packageName)) {
                                classNames.add(className);
                            }
                        }
                    } catch (Throwable ignore) {
                        Log.e("ARouter", "Scan map file in dex files made error.", ignore);
                    } finally {
                        if (null != dexfile) {
                            try {
                                dexfile.close();
                            } catch (Throwable ignore) {
                            }
                        }

                        parserCtl.countDown();
                    }
                }
            });
        }

        parserCtl.await();

        Log.d(Consts.TAG, "Filter " + classNames.size() + " classes by packageName <" + packageName + ">");
        return classNames;
    }

其中getSourcePaths是通过以下方式获取apk所在目录，

ApplicationInfo applicationInfo = context.getPackageManager().getApplicationInfo(context.getPackageName(), 0);
        File sourceApk = new File(applicationInfo.sourceDir);

        List<String> sourcePaths = new ArrayList<>();
        sourcePaths.add(applicationInfo.sourceDir); //add the default apk path

通过ARouter.getInstance().build() 返回一个PostCard
在初始加载过程中只生成router节点。在检测过程中动态添加
关键点：RouterInfo和PostCard-----
数据结构统一管理类：

class Warehouse {
    // Cache route and metas
    static Map<String, Class<? extends IRouteGroup>> groupsIndex = new HashMap<>();
    static Map<String, RouteMeta> routes = new HashMap<>();

    // Cache provider
    static Map<Class, IProvider> providers = new HashMap<>();
    static Map<String, RouteMeta> providersIndex = new HashMap<>();

    // Cache interceptor
    static Map<Integer, Class<? extends IInterceptor>> interceptorsIndex = new UniqueKeyTreeMap<>("More than one interceptors use same priority [%s]");
    static List<IInterceptor> interceptors = new ArrayList<>();

    static void clear() {
        routes.clear();
        groupsIndex.clear();
        providers.clear();
        providersIndex.clear();
        interceptors.clear();
        interceptorsIndex.clear();
    }
}

确定好拦截器之后，使用InterceptorServiceImpl执行拦截操作,拦截器的执行也是在异步操作中进行的：
生成代码：

image.png

public class ARouterb implements IRouteGroup {
@Override
public void loadInto(Map<String, RouteMeta> atlas) {
atlas.put("/b/test", RouteMeta.build(RouteType.ACTIVITY, BActivity.class, "/b/test", "b", new java.util.HashMap<String, Integer>(){{put("key1", 3); }}, -1, -2147483648));
}
}