自定义注解+Spel实现分布式锁

曾经终败给现在 2022-10-22 09:21 171阅读 0赞

*  依赖

<?xml version="1.0" encoding="UTF-8"?>
    <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>4.0.0</modelVersion>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.4.4</version>
            <relativePath/> 
        </parent>
        <groupId>com.example</groupId>
        <artifactId>demo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>demo</name>
        <description>Demo project for Spring Boot</description>
        <properties>
            <java.version>1.8</java.version>
        </properties>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-data-redis</artifactId>
                <version>2.3.7.RELEASE</version>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.integration</groupId>
                <artifactId>spring-integration-redis</artifactId>
                <version>5.4.5</version>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-aop</artifactId>
            </dependency>
    
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </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 { 
    
    	/** * 默认过期时间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);
        }
    
    }

*  自定义注解

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 "";
    }

*  自定义切面

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();
        }
    
    }

*  测试类

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);
        }
    
    }

*  执行结果

.   ____          _            __ _ _
     /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
     \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
      ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: 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