| /* |
| * 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.storm.topology; |
| |
| import java.io.FileInputStream; |
| import java.io.FileNotFoundException; |
| import java.io.InputStreamReader; |
| import java.nio.charset.Charset; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import org.apache.storm.Config; |
| import org.apache.storm.StormSubmitter; |
| import org.apache.storm.shade.org.apache.commons.lang.StringUtils; |
| import org.apache.storm.shade.org.yaml.snakeyaml.Yaml; |
| import org.apache.storm.shade.org.yaml.snakeyaml.constructor.SafeConstructor; |
| import org.apache.storm.utils.Utils; |
| |
| /** |
| * Extensions of this class takes a reference to one or more configuration files. The main() method should call ConfigurableTopology.start() |
| * and it must instantiate a TopologyBuilder in the run() method. |
| * |
| * <pre> |
| * { |
| * public class MyTopology extends ConfigurableTopology { |
| * |
| * public static void main(String[] args) throws Exception { |
| * ConfigurableTopology.start(new MyTopology(), args); |
| * } |
| * |
| * @Override |
| * protected int run(String[] args) { |
| * TopologyBuilder builder = new TopologyBuilder(); |
| * |
| * // build topology as usual |
| * |
| * return submit("crawl", conf, builder); |
| * } |
| * } |
| * </pre> |
| **/ |
| public abstract class ConfigurableTopology { |
| |
| protected Config conf = new Config(); |
| |
| public static void start(ConfigurableTopology topology, String[] args) { |
| String[] remainingArgs = topology.parse(args); |
| try { |
| topology.run(remainingArgs); |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| public static Config loadConf(String resource, Config conf) |
| throws FileNotFoundException { |
| Yaml yaml = new Yaml(new SafeConstructor()); |
| Map<String, Object> ret = (Map<String, Object>) yaml.load(new InputStreamReader( |
| new FileInputStream(resource), Charset.defaultCharset())); |
| if (ret == null) { |
| ret = new HashMap<>(); |
| } else { |
| // If the config consists of a single key 'config', its values are used |
| // instead. This means that the same config files can be used with Flux |
| // and the ConfigurableTopology. |
| if (ret.size() == 1) { |
| Object confNode = ret.get("config"); |
| if (confNode != null && confNode instanceof Map) { |
| ret = (Map<String, Object>) confNode; |
| } |
| } |
| } |
| conf.putAll(ret); |
| return conf; |
| } |
| |
| protected Config getConf() { |
| return conf; |
| } |
| |
| protected abstract int run(String[] args) throws Exception; |
| |
| /** |
| * Submits the topology with the name taken from the configuration. |
| **/ |
| protected int submit(Config conf, TopologyBuilder builder) { |
| String name = (String) Utils.get(conf, Config.TOPOLOGY_NAME, null); |
| if (StringUtils.isBlank(name)) { |
| throw new RuntimeException( |
| "No value found for " + Config.TOPOLOGY_NAME); |
| } |
| return submit(name, conf, builder); |
| } |
| |
| /** |
| * Submits the topology under a specific name. |
| **/ |
| protected int submit(String name, Config conf, TopologyBuilder builder) { |
| try { |
| StormSubmitter.submitTopology(name, conf, |
| builder.createTopology()); |
| } catch (Exception e) { |
| e.printStackTrace(); |
| return -1; |
| } |
| return 0; |
| } |
| |
| private String[] parse(String[] args) { |
| |
| List<String> newArgs = new ArrayList<>(); |
| Collections.addAll(newArgs, args); |
| |
| Iterator<String> iter = newArgs.iterator(); |
| while (iter.hasNext()) { |
| String param = iter.next(); |
| if (param.equals("-conf")) { |
| if (!iter.hasNext()) { |
| throw new RuntimeException("Conf file not specified"); |
| } |
| iter.remove(); |
| String resource = iter.next(); |
| try { |
| loadConf(resource, conf); |
| } catch (FileNotFoundException e) { |
| throw new RuntimeException("File not found : " + resource); |
| } |
| iter.remove(); |
| } |
| } |
| |
| return newArgs.toArray(new String[newArgs.size()]); |
| } |
| } |