A case of using Zookeeper to implement distributed locks in SpringBoot

Here is an example of using Zookeeper and Curator to implement distributed locks in Spring Boot. Distributed locks ensure that in a distributed environment, only one client can access shared resources at the same time.

1. Introduce dependencies

existAdd necessary dependencies to the file:

<dependencies>
    <dependency>
        <groupId></groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>
    <dependency>
        <groupId></groupId>
        <artifactId>curator-framework</artifactId>
        <version>5.1.0</version>
    </dependency>
    <dependency>
        <groupId></groupId>
        <artifactId>curator-recipes</artifactId>
        <version>5.1.0</version>
    </dependency>
    <dependency>
        <groupId></groupId>
        <artifactId>zookeeper</artifactId>
        <version>3.8.0</version>
    </dependency>
</dependencies>

2. Configure Zookeeper connection

existConfigure the Zookeeper connection string in the file:

zookeeper:
  connect-string: localhost:2181

3. Create a Zookeeper configuration class

Create a configuration class to initialize the Curator client:

import ;
import ;
import ;
import ;
import ;
import ;

@Configuration
public class ZookeeperConfig {

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

    @Bean(initMethod = "start", destroyMethod = "close")
    public CuratorFramework curatorFramework() {
        return ()
             .connectString(connectString)
             .sessionTimeoutMs(5000)
             .retryPolicy(new RetryNTimes(3, 5000))
             .build();
    }
}

4. Create a distributed lock service class

Create a service class to achieve the acquisition and release of distributed locks:

import ;
import ;
import ;
import ;

import ;

@Service
public class DistributedLockService {

    @Autowired
    private CuratorFramework curatorFramework;

    // Obtain distributed lock    public boolean acquireLock(String lockPath, int timeout, TimeUnit timeUnit) {
        InterProcessMutex lock = new InterProcessMutex(curatorFramework, lockPath);
        try {
            return (timeout, timeUnit);
        } catch (Exception e) {
            ();
            return false;
        }
    }

    // Release the distributed lock    public void releaseLock(String lockPath) {
        InterProcessMutex lock = new InterProcessMutex(curatorFramework, lockPath);
        try {
            ();
        } catch (Exception e) {
            ();
        }
    }
}

5. Create a controller class to test distributed locks

Create a controller class to simulate the operation of acquiring and releasing distributed locks:

import ;
import ;
import ;
import ;

@RestController
public class DistributedLockController {

    @Autowired
    private DistributedLockService distributedLockService;

    @GetMapping("/lock")
    public String acquireDistributedLock(@RequestParam String lockPath, @RequestParam int timeout, @RequestParam String timeUnit) {
        TimeUnit unit = (timeUnit);
        boolean acquired = (lockPath, timeout, unit);
        if (acquired) {
            return "Successfully acquired distributed lock";
        } else {
            return "Failed to acquire distributed lock";
        }
    }

    @GetMapping("/unlock")
    public String releaseDistributedLock(@RequestParam String lockPath) {
        (lockPath);
        return "Successfully released distributed locks";
    }
}

6. Run the Spring Boot application

After starting the Spring Boot application, you can test the functionality of distributed locks by accessing the following URL:

Acquire the lock:http://localhost:8080/lock?lockPath=/my-lock&timeout=10&timeUnit=SECONDS
Release the lock:http://localhost:8080/unlock?lockPath=/my-lock

In this example:

DistributedLockServiceClass useInterProcessMutexTo achieve the acquisition and release of distributed locks.InterProcessMutexIt is a class provided by the Curator library for implementing distributed mutexes.
DistributedLockControllerThe class provides two API endpoints, one for acquiring a distributed lock and the other for freeing a distributed lock.

In this way, you can use Zookeeper to implement distributed locks in Spring Boot applications to ensure resource access control in a distributed environment.

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