| /** |
| * 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 backtype.storm.messaging; |
| |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.Method; |
| import java.util.Map; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import backtype.storm.Config; |
| |
| public class TransportFactory { |
| public static final Logger LOG = LoggerFactory.getLogger(TransportFactory.class); |
| |
| public static IContext makeContext(Map storm_conf) { |
| |
| // get factory class name |
| String transport_plugin_klassName = (String) storm_conf.get(Config.STORM_MESSAGING_TRANSPORT); |
| LOG.info("JStorm peer transport plugin:" + transport_plugin_klassName); |
| |
| IContext transport = null; |
| try { |
| // create a factory class |
| Class klass = Class.forName(transport_plugin_klassName); |
| // obtain a context object |
| // Object obj = klass.newInstance(); |
| Constructor constructor = klass.getDeclaredConstructor(); |
| constructor.setAccessible(true); |
| Object obj = constructor.newInstance(); |
| LOG.info("TransportFactory makeContext: new klass: " + obj); |
| if (obj instanceof IContext) { |
| // case 1: plugin is a IContext class |
| transport = (IContext) obj; |
| // initialize with storm configuration |
| transport.prepare(storm_conf); |
| LOG.info("TransportFactory makeContext: start prepare... " + storm_conf); |
| } else { |
| // case 2: Non-IContext plugin must have a |
| // makeContext(storm_conf) method that returns IContext object |
| Method method = klass.getMethod("makeContext", Map.class); |
| LOG.debug("object:" + obj + " method:" + method); |
| transport = (IContext) method.invoke(obj, storm_conf); |
| } |
| LOG.info("TransportFactory makeContext done..."); |
| } catch (Exception e) { |
| throw new RuntimeException("Fail to construct messaging plugin from plugin " + transport_plugin_klassName, e); |
| } |
| return transport; |
| } |
| |
| } |