• 依賴

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0modelVersion>
    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>2.4.4version>
        <relativePath/> 
    parent>
    <groupId>com.examplegroupId>
    <artifactId>demoartifactId>
    <version>0.0.1-SNAPSHOTversion>
    <name>demoname>
    <description>Demo project for Spring Bootdescription>
    <properties>
        <java.version>1.8java.version>
    properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starterartifactId>
        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-data-redisartifactId>
            <version>2.3.7.RELEASEversion>
        dependency>

        <dependency>
            <groupId>org.springframework.integrationgroupId>
            <artifactId>spring-integration-redisartifactId>
            <version>5.4.5version>
        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-aopartifactId>
        dependency>

    dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-maven-pluginartifactId>
            plugin>
        plugins>
    build>

project>

• RedisLockRegistryConfig

package com.example.demo.config;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.integration.redis.util.RedisLockRegistry;


@Configuration
public class RedisLockRegistryConfig {

	/**
	 * 默認過期時間300s
	 */
    @Value("${distribute.lock.expireTime:300}")
    private long expireTime;

    @Value("${spring.application.name:'distributeLock'}")
    private String registryKey;

    @Bean
    public RedisLockRegistry redisLockRegistry(RedisConnectionFactory factory){
        return new RedisLockRegistry(factory, registryKey, expireTime * 1000);
    }

}

• 自定義注解

package com.example.demo.aop.annotation;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface DistributeLock {

    String name() default "";
}

• 自定義切面

package com.example.demo.aop;

import com.example.demo.aop.annotation.DistributeLock;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.reflect.MethodSignature;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.DefaultParameterNameDiscoverer;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.core.annotation.Order;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.Expression;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;
import org.springframework.integration.redis.util.RedisLockRegistry;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.util.Objects;
import java.util.concurrent.locks.Lock;

@Aspect
@Order
@Component
public class DistributeLockAop {

    private static final Logger LOGGER = LoggerFactory.getLogger(DistributeLockAop.class);

    private static SpelExpressionParser parser = new SpelExpressionParser();

    private static DefaultParameterNameDiscoverer discoverer = new DefaultParameterNameDiscoverer();

    private RedisLockRegistry redisLockRegistry;

    public DistributeLockAop(RedisLockRegistry redisLockRegistry) {
        this.redisLockRegistry = redisLockRegistry;
    }

    @Around("@annotation(com.example.demo.aop.annotation.DistributeLock)")
    public Object around(ProceedingJoinPoint joinPoint) throws Throwable {
        Class<?> clazz = joinPoint.getTarget().getClass();
        MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
        Method method = clazz.getDeclaredMethod(methodSignature.getName(), methodSignature.getParameterTypes());
        DistributeLock distributeLock = AnnotationUtils.findAnnotation(method, DistributeLock.class);
        assert distributeLock != null;
        String spel = distributeLock.name();
        String lockName = generateKeyBySpEL(spel, method, joinPoint.getArgs());
        Lock lock = redisLockRegistry.obtain(lockName);
        if (lock.tryLock()) {
            LOGGER.info("DistributeLock locked Success. key:{}", lockName);
            return joinPoint.proceed();
        } else {
            LOGGER.error("DistributeLock locked Failure. key:{}", lockName);
            throw new Exception("Lock failure");
        }
    }

    public static String generateKeyBySpEL(String spELString, Method method, Object[] args) {
        String[] paramNames = discoverer.getParameterNames(method);
        Expression expression = parser.parseExpression(spELString);
        EvaluationContext context = new StandardEvaluationContext();
        for (int i = 0; i < args.length; i++) {
            assert paramNames != null;
            context.setVariable(paramNames[i], args[i]);
        }
        return Objects.requireNonNull(expression.getValue(context)).toString();
    }

}

• 測試類

package com.example.demo.base;

import com.example.demo.aop.annotation.DistributeLock;
import org.springframework.stereotype.Service;

@Service
public class SomeService {

    @DistributeLock(name = "'lock:' + #something.name")
    public void doSomething(Something something) {

    }
}

package com.example.demo.base;

public class Something {

    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

package com.example.demo;

import com.example.demo.base.Something;
import com.example.demo.base.SomeService;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;

@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {

        ConfigurableApplicationContext context = SpringApplication.run(DemoApplication.class, args);
        SomeService someService = context.getBean("someService", SomeService.class);
        Something something = new Something();
        something.setName("gogogo");
        someService.doSomething(something);
    }

}

• 執行結果

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.4.4)

2021-03-25 16:27:49.638  INFO 10492 --- [           main] com.example.demo.DemoApplication         : Starting DemoApplication using Java 1.8.0_141 on P80320948 with PID 10492 (D:\workspace\demo\target\classes started by 80320948 in D:\workspace\demo)
2021-03-25 16:27:49.641  INFO 10492 --- [           main] com.example.demo.DemoApplication         : No active profile set, falling back to default profiles: default
2021-03-25 16:27:50.006  INFO 10492 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode!
2021-03-25 16:27:50.008  INFO 10492 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data Redis repositories in DEFAULT mode.
2021-03-25 16:27:50.028  INFO 10492 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 6 ms. Found 0 Redis repository interfaces.
2021-03-25 16:27:50.144  INFO 10492 --- [           main] faultConfiguringBeanFactoryPostProcessor : No bean named 'errorChannel' has been explicitly defined. Therefore, a default PublishSubscribeChannel will be created.
2021-03-25 16:27:50.153  INFO 10492 --- [           main] faultConfiguringBeanFactoryPostProcessor : No bean named 'taskScheduler' has been explicitly defined. Therefore, a default ThreadPoolTaskScheduler will be created.
2021-03-25 16:27:50.156  INFO 10492 --- [           main] faultConfiguringBeanFactoryPostProcessor : No bean named 'integrationHeaderChannelRegistry' has been explicitly defined. Therefore, a default DefaultHeaderChannelRegistry will be created.
2021-03-25 16:27:50.253  INFO 10492 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.integration.config.IntegrationManagementConfiguration' of type [org.springframework.integration.config.IntegrationManagementConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2021-03-25 16:27:50.329  INFO 10492 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'integrationChannelResolver' of type [org.springframework.integration.support.channel.BeanFactoryChannelResolver] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2021-03-25 16:27:50.330  INFO 10492 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'integrationDisposableAutoCreatedBeans' of type [org.springframework.integration.config.annotation.Disposables] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2021-03-25 16:27:50.832  INFO 10492 --- [           main] o.s.s.c.ThreadPoolTaskScheduler          : Initializing ExecutorService 'taskScheduler'
2021-03-25 16:27:50.872  INFO 10492 --- [           main] o.s.i.endpoint.EventDrivenConsumer       : Adding {logging-channel-adapter:_org.springframework.integration.errorLogger} as a subscriber to the 'errorChannel' channel
2021-03-25 16:27:50.872  INFO 10492 --- [           main] o.s.i.channel.PublishSubscribeChannel    : Channel 'demo.errorChannel' has 1 subscriber(s).
2021-03-25 16:27:50.872  INFO 10492 --- [           main] o.s.i.endpoint.EventDrivenConsumer       : started bean '_org.springframework.integration.errorLogger'
2021-03-25 16:27:50.878  INFO 10492 --- [           main] com.example.demo.DemoApplication         : Started DemoApplication in 1.756 seconds (JVM running for 2.569)
2021-03-25 16:27:51.545  INFO 10492 --- [           main] com.example.demo.aop.DistributeLockAop   : DistributeLock locked Success. key:lock:gogogo