| /* |
| * 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.batchee.cli; |
| |
| import org.apache.batchee.cli.command.Abandon; |
| import org.apache.batchee.cli.command.CliConfiguration; |
| import org.apache.batchee.cli.command.Eviction; |
| import org.apache.batchee.cli.command.Executions; |
| import org.apache.batchee.cli.command.api.Exit; |
| import org.apache.batchee.cli.command.Instances; |
| import org.apache.batchee.cli.command.Names; |
| import org.apache.batchee.cli.command.Restart; |
| import org.apache.batchee.cli.command.Running; |
| import org.apache.batchee.cli.command.Start; |
| import org.apache.batchee.cli.command.Status; |
| import org.apache.batchee.cli.command.Stop; |
| import org.apache.batchee.cli.command.api.Command; |
| import org.apache.batchee.cli.command.api.UserCommand; |
| import org.apache.commons.cli.CommandLine; |
| import org.apache.commons.cli.CommandLineParser; |
| import org.apache.commons.cli.DefaultParser; |
| import org.apache.commons.cli.HelpFormatter; |
| import org.apache.commons.cli.Option; |
| import org.apache.commons.cli.Options; |
| import org.apache.commons.cli.ParseException; |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.lang.reflect.Field; |
| import java.lang.reflect.ParameterizedType; |
| import java.lang.reflect.Type; |
| import java.net.URL; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.Enumeration; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.ServiceLoader; |
| import java.util.TreeMap; |
| |
| import static java.lang.ClassLoader.getSystemClassLoader; |
| import static java.util.Arrays.asList; |
| |
| public class BatchEECLI { |
| public static void main(final String[] args) { |
| final Iterator<CliConfiguration> configuration = ServiceLoader.load(CliConfiguration.class).iterator(); |
| final CliConfiguration cliConfiguration = configuration.hasNext() ? configuration.next() : new CliConfiguration() { |
| @Override |
| public String name() { |
| return "batchee"; |
| } |
| |
| @Override |
| public String description() { |
| return "BatchEE CLI"; |
| } |
| |
| @Override |
| public boolean addDefaultCommands() { |
| return true; |
| } |
| |
| @Override |
| public Iterator<Class<? extends UserCommand>> userCommands() { |
| final Collection<Class<? extends UserCommand>> classes = new ArrayList<Class<? extends UserCommand>>(); |
| try { // read manually cause we dont want to instantiate them there, so no ServiceLoader |
| final ClassLoader tccl = Thread.currentThread().getContextClassLoader(); |
| final ClassLoader loader = tccl != null ? tccl : getSystemClassLoader(); |
| final Enumeration<URL> uc = loader.getResources("META-INF/services/org.apache.batchee.cli.command.UserCommand"); |
| while (uc.hasMoreElements()) { |
| final URL url = uc.nextElement(); |
| BufferedReader r = null; |
| try { |
| r = new BufferedReader(new InputStreamReader(url.openStream())); |
| String line; |
| while ((line = r.readLine()) != null) { |
| if (line.startsWith("#") || line.trim().isEmpty()) { |
| continue; |
| } |
| classes.add(Class.class.cast(loader.loadClass(line.trim()))); |
| } |
| } catch (final IOException ioe) { |
| throw new IllegalStateException(ioe); |
| } catch (final ClassNotFoundException cnfe) { |
| throw new IllegalArgumentException(cnfe); |
| } finally { |
| if (r != null) { |
| r.close(); |
| } |
| } |
| } |
| } catch (final IOException e) { |
| throw new IllegalStateException(e); |
| } |
| return classes.iterator(); |
| } |
| |
| @Override |
| public Runnable decorate(final Runnable task) { |
| return task; |
| } |
| }; |
| |
| final Map<String, Class<? extends Runnable>> commands = new TreeMap<String, Class<? extends Runnable>>(); |
| if (cliConfiguration.addDefaultCommands()) { |
| for (final Class<? extends Runnable> type : |
| Arrays.asList(Names.class, |
| Start.class, Restart.class, |
| Status.class, Running.class, |
| Stop.class, Abandon.class, |
| Instances.class, Executions.class, |
| Eviction.class)) { |
| addCommand(commands, type); |
| } |
| } |
| final Iterator<Class<? extends UserCommand>> userCommands = cliConfiguration.userCommands(); |
| if (userCommands != null) { |
| while (userCommands.hasNext()) { |
| addCommand(commands, userCommands.next()); |
| } |
| } |
| |
| if (args == null || args.length == 0) { |
| System.err.print(help(commands)); |
| return; |
| } |
| |
| final Class<? extends Runnable> cmd = commands.get(args[0]); |
| if (cmd == null) { |
| if (args[0].equals("help")) { |
| if (args.length > 1) { |
| final Class<? extends Runnable> helpCmd = commands.get(args[1]); |
| if (helpCmd != null) { |
| printHelp(helpCmd.getAnnotation(Command.class), buildOptions(helpCmd, new HashMap<String, Field>())); |
| return; |
| } |
| } // else let use the default help |
| } |
| System.err.print(help(commands)); |
| return; |
| } |
| |
| // build the command now |
| final Command command = cmd.getAnnotation(Command.class); |
| if (command == null) { |
| System.err.print(help(commands)); |
| return; |
| } |
| |
| final Map<String, Field> fields = new HashMap<String, Field>(); |
| final Options options = buildOptions(cmd, fields); |
| |
| final Collection<String> newArgs = new ArrayList<String>(asList(args)); |
| newArgs.remove(newArgs.iterator().next()); |
| |
| final CommandLineParser parser = new DefaultParser(); |
| try { |
| final CommandLine line = parser.parse(options, newArgs.toArray(new String[newArgs.size()])); |
| |
| final Runnable commandInstance = cmd.newInstance(); |
| if (!newArgs.isEmpty()) { // we have few commands we can execute without args even if we have a bunch of config |
| for (final Map.Entry<String, Field> option : fields.entrySet()) { |
| final String key = option.getKey(); |
| if (key.isEmpty()) { // arguments, not an option |
| final List<String> list = line.getArgList(); |
| if (list != null) { |
| final Field field = option.getValue(); |
| final Type expectedType = field.getGenericType(); |
| if (ParameterizedType.class.isInstance(expectedType)) { |
| final ParameterizedType pt = ParameterizedType.class.cast(expectedType); |
| if ((pt.getRawType() == List.class || pt.getRawType() == Collection.class) |
| && pt.getActualTypeArguments().length == 1 && pt.getActualTypeArguments()[0] == String.class) { |
| field.set(commandInstance, list); |
| } else { |
| throw new IllegalArgumentException("@Arguments only supports List<String>"); |
| } |
| } else { |
| throw new IllegalArgumentException("@Arguments only supports List<String>"); |
| } |
| } |
| } else { |
| final String value = line.getOptionValue(key); |
| if (value != null) { |
| final Field field = option.getValue(); |
| final Class<?> expectedType = field.getType(); |
| if (String.class == expectedType) { |
| field.set(commandInstance, value); |
| } else if (long.class == expectedType) { |
| field.set(commandInstance, Long.parseLong(value)); |
| } else if (int.class == expectedType) { |
| field.set(commandInstance, Integer.parseInt(value)); |
| } else if (boolean.class == expectedType) { |
| field.set(commandInstance, Boolean.parseBoolean(value)); |
| } else if (short.class == expectedType) { |
| field.set(commandInstance, Short.parseShort(value)); |
| } else if (byte.class == expectedType) { |
| field.set(commandInstance, Byte.parseByte(value)); |
| } else { |
| try { |
| field.set(commandInstance, expectedType.getMethod("fromString", String.class) |
| .invoke(null, value)); |
| } catch (final Exception e) { |
| throw new IllegalArgumentException(expectedType + " not supported as option with value '" + value + "'"); |
| } |
| } |
| } |
| } |
| } |
| } |
| cliConfiguration.decorate(commandInstance).run(); |
| } catch (final ParseException e) { |
| printHelp(command, options); |
| } catch (final RuntimeException e) { |
| Class<?> current = e.getClass(); |
| while (current != null) { |
| final Exit annotation = current.getAnnotation(Exit.class); |
| if (annotation != null) { |
| System.exit(annotation.value()); |
| } |
| current = current.getSuperclass(); |
| } |
| throw e; |
| } catch (final InstantiationException e) { |
| throw new IllegalStateException(e); |
| } catch (final IllegalAccessException e) { |
| throw new IllegalStateException(e); |
| } |
| } |
| |
| private static void printHelp(final Command command, final Options options) { |
| new HelpFormatter().printHelp(command.name(), '\n' + command.description() + "\n\n", options, null, true); |
| } |
| |
| private static Options buildOptions(final Class<? extends Runnable> cmd, Map<String, Field> fields) { |
| final Options options = new Options(); |
| Class<?> it = cmd; |
| while (it != null) { |
| for (final Field f : it.getDeclaredFields()) { |
| final org.apache.batchee.cli.command.api.Option option = f.getAnnotation(org.apache.batchee.cli.command.api.Option.class); |
| final org.apache.batchee.cli.command.api.Arguments arguments = f.getAnnotation(org.apache.batchee.cli.command.api.Arguments.class); |
| if (option != null && arguments != null) { |
| throw new IllegalArgumentException("An @Option can't get @Arguments: " + f); |
| } |
| |
| if (option != null) { |
| final String name = option.name(); |
| options.addOption(Option.builder(name).desc(option.description()).hasArg().build()); |
| fields.put(name, f); |
| f.setAccessible(true); |
| } else if (arguments != null) { |
| if (fields.put("", f) != null) { |
| throw new IllegalArgumentException("A command can only have a single @Arguments"); |
| } |
| f.setAccessible(true); |
| } |
| } |
| it = it.getSuperclass(); |
| } |
| return options; |
| } |
| |
| private static String help(final Map<String, Class<? extends Runnable>> commands) { |
| final StringBuilder builder = new StringBuilder(); |
| for (final Map.Entry<String, Class<? extends Runnable>> cmd : commands.entrySet()) { |
| final Command c = cmd.getValue().getAnnotation(Command.class); |
| if (c == null) { |
| throw new IllegalArgumentException("Missing @Command on " + cmd.getValue()); |
| } |
| builder.append(c.name()); |
| if (!c.description().isEmpty()) { |
| builder.append(": ").append(c.description()); |
| } |
| builder.append(System.getProperty("line.separator")); |
| } |
| return builder.toString(); |
| } |
| |
| private static void addCommand(final Map<String, Class<? extends Runnable>> commands, final Class<? extends Runnable> type) { |
| final Command command = type.getAnnotation(Command.class); |
| if (command == null) { |
| throw new IllegalArgumentException(type + " is not a command, missing @Command"); |
| } |
| |
| final String name = command.name(); |
| commands.put(name, type); |
| } |
| |
| private BatchEECLI() { |
| // no-op |
| } |
| } |