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文章目录
- 系列文章目录
- 前言
前言
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Zookeeper是一个Apache开源的分布式的应用，为系统架构提供协调服务。从设计模式角度来审视：该组件是一个基于观察者模式设计的框架，负责存储和管理数据，接受观察者的注册，一旦数据的状态发生变化，Zookeeper就将负责通知已经在Zookeeper上注册的观察者做出相应的反应，从而实现集群中类似Master/Slave管理模式。ZooKeeper的目标就是封装好复杂易出错的关键服务，将简单易用的接口和性能高效、功能稳定的系统提供给用户。
zookeeper安装单机模式
http://www.javacui.com/opensource/445.html
官网
https://curator.apache.org/releases.html#Current_Release
POM引入
<!-- curator -->
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-recipes</artifactId>
<version>5.2.0</version>
</dependency>
<!-- fastjson -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.79</version>
</dependency>
application.yml定义连接属性
server:
port: 80
curator:
connectString: 192.168.3.22:2181 # zookeeper 地址
retryCount: 1 # 重试次数
elapsedTimeMs: 2000 # 重试间隔时间
sessionTimeoutMs: 60000 # session超时时间
connectionTimeoutMs: 10000 # 连接超时时间
使用Springboot配置读取
package com.example.springboot.config;
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
/**
* @Auther: Java小强
* @Date: 2022/2/4 - 19:37
* @Decsription: com.example.springboot.config
* @Version: 1.0
*/
@Data
@Component
@ConfigurationProperties(prefix = "curator")
public class CuratorConf {
private int retryCount;
private int elapsedTimeMs;
private String connectString;
private int sessionTimeoutMs;
private int connectionTimeoutMs;
}
公用连接创建对象
package com.example.springboot.tool;
import com.example.springboot.config.CuratorConf;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.retry.RetryNTimes;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* @Auther: Java小强
* @Date: 2022/2/4 - 19:37
* @Decsription: com.example.springboot.tool
* @Version: 1.0
*/
@Configuration
public class ZkConfiguration {
@Autowired
private CuratorConf curatorConf;
/**
* 这里会自动调用一次start，请勿重复调用
*/
@Bean(initMethod = "start")
public CuratorFramework curatorFramework() {
return CuratorFrameworkFactory.newClient(
curatorConf.getConnectString(),
curatorConf.getSessionTimeoutMs(),
curatorConf.getConnectionTimeoutMs(),
new RetryNTimes(curatorConf.getRetryCount(), curatorConf.getElapsedTimeMs()));
}
}
编写测试类，实现各种基础操作，并挨个测试
package com.example.springboot;
import com.alibaba.fastjson.JSON;
import com.example.springboot.tool.ZkConfiguration;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.api.BackgroundCallback;
import org.apache.curator.framework.api.CuratorEvent;
import org.apache.zookeeper.data.Stat;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import java.nio.charset.StandardCharsets;
import java.util.List;
/**
* @Auther: Java小强
* @Date: 2022/2/4 - 19:33
* @Decsription: com.example.springboot
* @Version: 1.0
*/
@SpringBootTest(classes = Application.class)
public class CuratorTest {
@Autowired
private ZkConfiguration zk;
// 测试连接
@Test
void contextLoads() {
CuratorFramework client= zk.curatorFramework();
System.out.println(client.toString());
}
// 创建节点
@Test
void createPath() throws Exception{
CuratorFramework client= zk.curatorFramework();
// 父节点不存在则创建
String path = client.create().creatingParentsIfNeeded().forPath("/javacui/p1" ,
"Java小强博客".getBytes(StandardCharsets.UTF_8));
System.out.println(path);
byte[] data = client.getData().forPath("/javacui/p1");
System.out.println(new String(data));
}
// 赋值，修改数据
@Test
void setData() throws Exception{
CuratorFramework client = zk.curatorFramework();
int version = 0; // 当前节点的版本信息
Stat stat = new Stat();
client.getData().storingStatIn(stat).forPath("/javacui/p1");
version = stat.getVersion();
// 如果版本信息不一致，说明当前数据被修改过，则修改失败程序报错
client.setData().withVersion(version).forPath("/javacui/p1",
"Java崔的博客".getBytes(StandardCharsets.UTF_8));
byte[] data = client.getData().forPath("/javacui/p1");
System.out.println(new String(data));
}
// 查询节点
@Test
void getPath() throws Exception{
CuratorFramework client= zk.curatorFramework();
// 查内容
byte[] data = client.getData().forPath("/javacui/p1");
System.out.println(new String(data));
// 查状态
Stat stat = new Stat();
client.getData().storingStatIn(stat).forPath("/javacui/p1");
System.out.println(JSON.toJSONString(stat, true));
}
// 删除节点
@Test
void deletePath() throws Exception{
CuratorFramework client= zk.curatorFramework();
// deletingChildrenIfNeeded如果有子节点一并删除
// guaranteed必须成功比如网络抖动时造成命令失败
client.delete().guaranteed().deletingChildrenIfNeeded().inBackground(new BackgroundCallback() {
@Override
public void processResult(CuratorFramework curatorFramework, CuratorEvent curatorEvent) throws Exception {
System.out.println("删除成功");
// { "path":"/javacui/p1","resultCode":0,"type":"DELETE"}
System.out.println(JSON.toJSONString(curatorEvent, true));
}
}).forPath("/javacui/p1");
}
// 查询子节点
@Test
void getPaths() throws Exception{
CuratorFramework client= zk.curatorFramework();
List<String> paths = client.getChildren().forPath("/javacui");
for(String p : paths){
System.out.println(p);
}
}
}
