目前來講 分佈式系統已經十分廣泛,國內經常使用的架構一般爲兩種,dubbo與springCloud。雖然兩種小弟都在本地耍過,可沒有實際經驗,基本還停留在紙上談兵的階段。java
現在公司使用了dubbo,特地作些筆錄:git
如下是個人我的理解:spring
dubbo項目,在項目結構上,與傳統的垂直分層項目基本一致。非要直觀的說不一樣之處,那就是在最外層有一個pom.xml文件,如圖express
目前,dubbo項目又開始維護,並轉移到了阿帕奇官網。只要項目結構不是特別奇葩,小弟用idea直接加載該pom文件 就能夠導入全部的分支項目(由於該pom是父項目的)。apache
另:idea 已經集成了dubbo插件,下載安裝後,可直接建立dubbo項目,與springCloud相比也不麻煩了。tomcat
因,公司再git倉庫中沒有properties文件,小弟我找了一圈的人去copy該文件,而後導入項目中,真是欲仙欲死。還好公司項目中規中矩。導入後沒費什麼勁就起來了。架構
啓動沒有使用tomcat 也沒使用spring加載,而是dubbo官方推薦的main方法:app
進入源碼可發現:less
/* * Copyright 1999-2011 Alibaba Group. * * Licensed 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 com.alibaba.dubbo.container; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Arrays; import java.util.Date; import java.util.List; import com.alibaba.dubbo.common.Constants; import com.alibaba.dubbo.common.extension.ExtensionLoader; import com.alibaba.dubbo.common.logger.Logger; import com.alibaba.dubbo.common.logger.LoggerFactory; import com.alibaba.dubbo.common.utils.ConfigUtils; /** * Main. (API, Static, ThreadSafe) * * @author william.liangf */ public class Main { public static final String CONTAINER_KEY = "dubbo.container"; public static final String SHUTDOWN_HOOK_KEY = "dubbo.shutdown.hook"; private static final Logger logger = LoggerFactory.getLogger(Main.class); private static final ExtensionLoader<Container> loader = ExtensionLoader.getExtensionLoader(Container.class); private static volatile boolean running = true; public static void main(String[] args) { try { if (args == null || args.length == 0) { String config = ConfigUtils.getProperty(CONTAINER_KEY, loader.getDefaultExtensionName()); args = Constants.COMMA_SPLIT_PATTERN.split(config); } final List<Container> containers = new ArrayList<Container>(); for (int i = 0; i < args.length; i ++) { containers.add(loader.getExtension(args[i])); } logger.info("Use container type(" + Arrays.toString(args) + ") to run dubbo serivce."); if ("true".equals(System.getProperty(SHUTDOWN_HOOK_KEY))) { Runtime.getRuntime().addShutdownHook(new Thread() { public void run() { for (Container container : containers) { try { container.stop(); logger.info("Dubbo " + container.getClass().getSimpleName() + " stopped!"); } catch (Throwable t) { logger.error(t.getMessage(), t); } synchronized (Main.class) { running = false; Main.class.notify(); } } } }); } for (Container container : containers) { container.start(); logger.info("Dubbo " + container.getClass().getSimpleName() + " started!"); } System.out.println(new SimpleDateFormat("[yyyy-MM-dd HH:mm:ss]").format(new Date()) + " Dubbo service server started!"); } catch (RuntimeException e) { e.printStackTrace(); logger.error(e.getMessage(), e); System.exit(1); } synchronized (Main.class) { while (running) { try { Main.class.wait(); } catch (Throwable e) { } } } } }
以上,加載spring時,也就會加載dubbo配置的xml文件,從而使用指定的dubbo命名空間加載dubbo對象。分佈式