dubbo与中间件的使用

女爷i 2022-03-17 09:16 227阅读 0赞

一、最近 Dubbo 生态添新兵，Dubbo Admin 发布v0.1  
[https://mp.weixin.qq.com/s/bY10K3kyn7gX6zssKZbtEg][https_mp.weixin.qq.com_s_bY10K3kyn7gX6zssKZbtEg]  
这样说dubbo部署需要zookeeper与admin必不可少的组件，也可以说是服务，类似这样  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyNDQ3MzAx_size_16_color_FFFFFF_t_70]二、dubbo与zookeeper使用  
废话不多说直接上代码  
pom.xml依赖

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
    
      <groupId>com.citydo</groupId>
      <artifactId>dubbo-zookeeper</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <packaging>jar</packaging>
    
      <name>dubbo-zookeeper</name>
      <url>http://maven.apache.org</url>
    
      <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
      </properties>
    
      <dependencies>
        <dependency>
          <groupId>org.apache.zookeeper</groupId>
          <artifactId>zookeeper</artifactId>
          <version>3.4.9</version>
        </dependency>
        
        <dependency>
          <groupId>org.apache.curator</groupId>
          <artifactId>curator-recipes</artifactId>
          <version>4.0.0</version>
        </dependency>
        
        <dependency>
          <groupId>org.apache.curator</groupId>
          <artifactId>curator-test</artifactId>
          <version>4.0.0</version>
          <scope>test</scope>
        </dependency>
        
        <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>4.11</version>
          <scope>test</scope>
        </dependency>
        
      </dependencies>
      
      <build>
          <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <configuration>
                        <source>1.8</source>
                        <target>1.8</target>
                    </configuration>
                </plugin>
            </plugins>
      </build>
    </project>

zookeeper的简单实现

package com.citydo.dubbo_zookeeper;
    
    import org.apache.zookeeper.*;
    
    public class ZkDemo implements Watcher {
    
        public static void main(String[] args) throws Exception {
            ZooKeeper zooKeeper = new ZooKeeper("127.0.0.1:2080",3000*10,new ZkDemo());
            ZooKeeper.States state = zooKeeper.getState();
            System.out.println(state);
            zooKeeper.exists("/data",new ZkDemo());
            zooKeeper.create("/data","ceshi".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
            Thread.sleep(2000);
    
        }
    
        @Override
        public void process(WatchedEvent event) {
            System.out.println("watcher 报警时间控制:"+event.getState());
            if (event.getType().equals(Event.EventType.NodeCreated)){
                System.out.println("watcher 报警时间控制:节点 创建");
            }
        }
    }

zookeeper实现HA

package com.citydo.dubbo_zookeeper;
    
    import org.apache.zookeeper.*;
    import org.apache.zookeeper.data.Stat;
    
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    
    public class HADemo implements Watcher {
    
        private String role = "master";
        private final static String HA_PATH = "/HA";
        private ZooKeeper zooKeeper;
    
        private ZooKeeper getZooKeeper(){
            try {
                zooKeeper = new ZooKeeper("127.0.0.1:2080",3000,null);
            } catch (IOException e) {
                e.printStackTrace();
            }
            return zooKeeper;
        }
    
    
        // 利用zk实现一个HA程序.模拟高可用场景
        public static void main(String[] args) throws KeeperException, InterruptedException {
    
            HADemo haDemo = new HADemo();
            ZooKeeper zooKeeper = haDemo.getZooKeeper();
            Stat exists = zooKeeper.exists(HA_PATH, haDemo);
            if (exists == null){
                zooKeeper.create(HA_PATH,"1".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
    
            }else{
                haDemo.role = "slave";
                System.out.println("\n" + 
                		"\n" + 
                		"我是 :"+haDemo.role);
            }
    
            while (true){
                if ("z".equals(readFromConsole())){
                    System.exit(0);
                }else {
                    System.out.println("输入z停止当前程序");
                }
    
            }
    
        }
    
        @Override
        public void process(WatchedEvent event) {
            if (event.getType().equals(Event.EventType.NodeCreated)){
                System.out.println(" \n" + 
                		"\n" + 
                		"我是 "+role);
            }
    
            if (event.getType().equals(Event.EventType.NodeDeleted)){
                System.out.println("master is down");
                this.role = "master";
    
                try {
                    zooKeeper.create(HA_PATH,"1".getBytes(), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL);
                    System.out.println("\n" + 
                    		"\n" + 
                    		"我是 :"+role);
                }catch (Exception e){
                    e.printStackTrace();
                }
    
            }
    
        }
    
        public static String readFromConsole(){
            BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
            try {
                return reader.readLine();
            } catch (IOException e) {
                e.printStackTrace();
                return "";
            }
        }
    }

[https_mp.weixin.qq.com_s_bY10K3kyn7gX6zssKZbtEg]: https://mp.weixin.qq.com/s/bY10K3kyn7gX6zssKZbtEg
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMyNDQ3MzAx_size_16_color_FFFFFF_t_70]: /images/20220317/83f2234ff16d4084b1358ef58d1cb518.png