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Implementing distributed coordination services based on Zookeeper

Hello everyone, I am the editor of Weizhuan Taobao Affiliate System 3.0, and I am also a programmer who doesn’t wear thermal underwear in winter and wants to be graceful even when it’s cold!

1. What is Zookeeper?

Zookeeper is an open source distributed application coordination service that provides efficient distributed data management and coordination capabilities. It is mainly used to solve data consistency problems in distributed applications, such as service registration and discovery, distributed locks, configuration management, etc.

2. Integrate Zookeeper in Spring Boot

In the Spring Boot project, we can use Zookeeper to implement distributed coordination services. Next, we will introduce how to configure, connect, and use Zookeeper.

2.1. Adding Dependencies

First, in Spring Bootpom.xmlAdd Zookeeper dependencies:

<dependency>
    <groupId>org.apache.zookeeper</groupId>
    <artifactId>zookeeper</artifactId>
    <version>3.7.0</version>
</dependency>
<dependency>
    <groupId>org.apache.curator</groupId>
    <artifactId>curator-framework</artifactId>
    <version>5.1.0</version>
</dependency>
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2.2. Configure Zookeeper connection

existapplication.propertiesConfigure Zookeeper connection information:

zookeeper.connect-string=localhost:2181
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2.3. Writing Zookeeper Service

Create a Zookeeper service class to connect to and operate Zookeeper:

package cn.juwatech.zookeeper;

import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import javax.annotation.PostConstruct;

@Service
public class ZookeeperService {

    @Value("${zookeeper.connect-string}")
    private String connectString;

    private CuratorFramework client;

    @PostConstruct
    private void init() {
        client = CuratorFrameworkFactory.newClient(connectString, new ExponentialBackoffRetry(1000, 3));
        client.start();
    }

    public void createNode(String path, byte[] data) throws Exception {
        client.create().creatingParentsIfNeeded().forPath(path, data);
    }

    public void setData(String path, byte[] data) throws Exception {
        client.setData().forPath(path, data);
    }

    public byte[] getData(String path) throws Exception {
        return client.getData().forPath(path);
    }

    public void deleteNode(String path) throws Exception {
        client.delete().deletingChildrenIfNeeded().forPath(path);
    }

    public void close() {
        client.close();
    }
}
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2.4. Using Zookeeper to implement distributed locks

In the sample code, we show how to use Zookeeper to implement a simple distributed lock:

package cn.juwatech.zookeeper;

import org.apache.curator.framework.recipes.locks.InterProcessMutex;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.annotation.PostConstruct;

@Service
public class DistributedLockService {

    @Autowired
    private ZookeeperService zookeeperService;

    private InterProcessMutex lock;

    @PostConstruct
    private void init() {
        lock = new InterProcessMutex(zookeeperService.getClient(), "/distributed-lock");
    }

    public void acquireLock() throws Exception {
        lock.acquire();
    }

    public void releaseLock() throws Exception {
        lock.release();
    }
}
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3. Conclusion

This article introduces how to integrate and use Zookeeper in Spring Boot projects to implement distributed coordination services, including key steps such as dependency configuration, connecting to Zookeeper, and implementing distributed locks. Through these examples, developers can better understand and apply the important role of Zookeeper in distributed systems.

Weizhuan Taoke System 3.0 is produced by the editor and is a high-quality product. Please indicate the source when reprinting!