| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.nifi; |
| |
| import org.apache.nifi.nar.NarUnpacker; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import java.net.MalformedURLException; |
| import java.net.URL; |
| import java.net.URLClassLoader; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Objects; |
| import java.util.concurrent.TimeUnit; |
| |
| public class StatelessNiFi { |
| private static final Logger logger = LoggerFactory.getLogger(StatelessNiFi.class); |
| |
| public static final String PROGRAM_CLASS_NAME = "org.apache.nifi.stateless.runtimes.Program"; |
| |
| public static final String EXTRACT_NARS = "ExtractNars"; |
| |
| public static void main(final String[] args) throws IOException, ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException { |
| |
| String nifi_home = System.getenv("NIFI_HOME"); |
| if (nifi_home == null || nifi_home.equals("")) { |
| nifi_home = "."; |
| } |
| |
| final File libDir = new File(nifi_home + "/lib"); |
| final File narWorkingDirectory = new File(nifi_home + "/work/stateless-nars"); |
| |
| if (args.length >= 1 && args[0].equals(EXTRACT_NARS)) { |
| if (!libDir.exists()) { |
| System.out.println("Specified lib directory <" + libDir + "> does not exist"); |
| return; |
| } |
| |
| final File[] narFiles = libDir.listFiles(file -> file.getName().endsWith(".nar")); |
| if (narFiles == null) { |
| System.out.println("Could not obtain listing of lib directory <" + libDir + ">"); |
| return; |
| } |
| |
| if (!narWorkingDirectory.exists() && !narWorkingDirectory.mkdirs()) { |
| throw new IOException("Could not create NAR working directory <" + narWorkingDirectory + ">"); |
| } |
| |
| logger.info("Unpacking {} NARs", narFiles.length); |
| final long startUnpack = System.nanoTime(); |
| for (final File narFile : narFiles) { |
| NarUnpacker.unpackNar(narFile, narWorkingDirectory, false); |
| } |
| |
| final long millis = TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - startUnpack); |
| logger.info("Finished unpacking {} NARs in {} millis", narFiles.length, millis); |
| |
| System.exit(0); |
| } |
| |
| File frameworkWorkingDirectory; |
| try { |
| frameworkWorkingDirectory = Objects.requireNonNull(narWorkingDirectory.listFiles(file -> file.getName().startsWith("nifi-framework")))[0]; |
| } catch (Exception ex) { |
| throw new FileNotFoundException("Could not find core stateless dependencies in the working directory <" + narWorkingDirectory + ">"); |
| } |
| |
| final File bundledDependenciesDir = new File(frameworkWorkingDirectory, NarUnpacker.BUNDLED_DEPENDENCIES_DIRECTORY); |
| final File[] jarFiles = bundledDependenciesDir.listFiles(); |
| if (jarFiles == null) { |
| throw new IOException("Could not obtain listing of NiFi-Framework NAR's bundled dependencies in working directory <" + bundledDependenciesDir + ">"); |
| } |
| final URL[] jarUrls = toURLs(jarFiles); |
| |
| |
| final ClassLoader rootClassLoader = Thread.currentThread().getContextClassLoader(); |
| final URLClassLoader frameworkClassLoader = new URLClassLoader(jarUrls, rootClassLoader); |
| Thread.currentThread().setContextClassLoader(frameworkClassLoader); |
| |
| final Class<?> programClass = Class.forName(PROGRAM_CLASS_NAME, true, frameworkClassLoader); |
| final Method launchMethod = programClass.getMethod("launch", String[].class, ClassLoader.class, File.class); |
| launchMethod.setAccessible(true); |
| launchMethod.invoke(null, args, rootClassLoader, narWorkingDirectory); |
| } |
| |
| private static URL[] toURLs(final File[] files) throws MalformedURLException { |
| final List<URL> urls = new ArrayList<>(); |
| for (final File file : files) { |
| urls.add(file.toURI().toURL()); |
| } |
| |
| return urls.toArray(new URL[0]); |
| } |
| } |