vertx.FileResolver文件解析
FileResolver Class
//文件复制解析,复制文件到cache directory 中 ,VM options : -Dvertx.disableFileCPResolving public static final String DISABLE_CP_RESOLVING_PROP_NAME = "vertx.disableFileCPResolving"; private static final boolean ENABLE_CP_RESOLVING = !Boolean.getBoolean(DISABLE_CP_RESOLVING_PROP_NAME); /** * enableCaching 文件解析器是否用缓存,默认ture, * 设置两种方式:一、VertxOptions类的setFileResolverCachingEnabled方法 * 二、设置system property,VM options "-Dvertx.disableFileCaching",对原代码无侵入性 */ public FileResolver(Vertx vertx, boolean enableCaching) { this.vertx = vertx; this.enableCaching = enableCaching; //获取工作目录 -Dvertx.cwd String cwdOverride = System.getProperty("vertx.cwd"); if (cwdOverride != null) { cwd = new File(cwdOverride).getAbsoluteFile(); } else { cwd = null; } if (ENABLE_CP_RESOLVING) { setupCacheDir(); } } /** * 建立cache目录 */ private void setupCacheDir() { //CACHE_DIR_BASE 通过-Dvertx.cacheDirBase设置,默认当前工作目录 .vertx隐藏目录下 String cacheDirName = CACHE_DIR_BASE + "/file-cache-" + UUID.randomUUID().toString(); cacheDir = new File(cacheDirName); if (!cacheDir.mkdirs()) { throw new IllegalStateException("Failed to create cache dir"); } // 添加 shutdown hook,kill -15 pid 触发缓存清理 shutdownHook = new Thread(() -> { CountDownLatch latch = new CountDownLatch(1); deleteCacheDir(ar -> latch.countDown()); try { latch.await(10, TimeUnit.SECONDS); } catch (Exception ignore) { } }); Runtime.getRuntime().addShutdownHook(shutdownHook); } /** * 删除cache目录 */ private void deleteCacheDir(Handler<AsyncResult<Void>> handler) { if (cacheDir != null && cacheDir.exists()) { vertx.fileSystem().deleteRecursive(cacheDir.getAbsolutePath(), true, handler); } else { handler.handle(Future.succeededFuture()); } }
解析文件
/** * 解析文件 */ public File resolveFile(String fileName) { // 现在disk查找文件 File file = new File(fileName); if (cwd != null && !file.isAbsolute()) {//是否是绝对路径 file = new File(cwd, fileName); } // -Dvertx.disableFileCPResolving 设置 if (!ENABLE_CP_RESOLVING) { return file; } /** * synchronized同步块,防止多线程对cache directory操作导致线程安全问题 */ synchronized (this) { if (!file.exists()) { // 首先本地文件cache 查找 File cacheFile = new File(cacheDir, fileName); if (enableCaching && cacheFile.exists()) { return cacheFile; } // 在classpath 查找 ClassLoader cl = getClassLoader(); //检查是否是UNIX separator,不是将文件路径 \ 替换为 /,不同操作系统 separator 存在差异 if (NON_UNIX_FILE_SEP) { fileName = fileName.replace(FILE_SEP, "/"); } String parentFileName = file.getParent(); if (parentFileName != null) { //缓存父目录中存在的所有资源 URL directoryContents = cl.getResource(parentFileName); if (directoryContents != null) { unpackUrlResource(directoryContents, parentFileName, cl, true); } } URL url = cl.getResource(fileName); if (url != null) { return unpackUrlResource(url, fileName, cl, false); } } } return file; } /** * 复制目录下所有文件到cacheDir目录下 */ private File unpackUrlResource(URL url, String fileName, ClassLoader cl, boolean isDir) { //获取协议 String prot = url.getProtocol(); switch (prot) { case "file": return unpackFromFileURL(url, fileName, cl); case "jar": return unpackFromJarURL(url, fileName, cl); case "bundle": // Apache Felix, Knopflerfish case "bundleentry": // Equinox case "bundleresource": // Equinox return unpackFromBundleURL(url, isDir); default: throw new IllegalStateException("Invalid url protocol: " + prot); } }
note:有时启动不了Application,很大可能由于用户权限问题无法建立cache directory 所导致