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目录一、使用SchedulinGConfigurer实现多个定时任务二、定时任务多机器部署解决方案三、基于Redis实现的代码示例3.1、基于redis实现的概述3.2、基于redi
示例参考lz此博文链接
定时任务Aop一样可以处理的,多台同个任务类似抢占,先抢到的则打标识记录在Redis中,根据有无标识去执行任务
在使用SchedulingConfigurer实现多个定时任务的示例基础上(即此博文链接的基础上)进行新增代码
目录结构如下图:
pom文件引入依赖包
<!-- Redis 配置 排除默认启动-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
<exclusions>
<exclusion>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
</exclusion>
</exclusions>
</dependency>
<!--redis连接池-->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-pool2</artifactId>
<version>2.9.0</version>
</dependency>
<!--jedis-->
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.9.0</version>
</dependency>
<!--aspectj-->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.7</version>
</dependency>
application.yml配置文件配置
upload:
#每天几点几分执行
taskOnecron: 0 25 22 ? * *
#每2分钟执行一次
taskTwocron: 0 0/2 * * * ?
spring:
redis:
#数据库索引
database: 0
host: 127.0.0.1
port: 6379
passWord:
jedis:
pool:
#最大连接数
max-active: 8
#最大阻塞等待时间(负数表示没限制)
max-wait: -1
#最大空闲
max-idle: 8
#最小空闲
min-idle: 0
#连接超时时间
timeout: 10000
自定义redis锁注解
package com.xz.jdk11.schedule.aop;
import java.lang.annotation.*;
import java.util.concurrent.TimeUnit;
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD})
@Documented
public @interface RedisLock {
//锁前缀
String lockPrefix() default "SCHEDULE_REDISLOCK:";
//键
String lockKey() default "";
//默认超时时间(秒)
long TimeOut() default 60;
//默认超时时间单位 (秒)
TimeUnit timeUtil() default TimeUnit.SECONDS;
}
redis切面类
package com.xz.jdk11.schedule.aop;
import cn.hutool.core.util.StrUtil;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
@Aspect
@Component
public class RedisLockAspect {
private static final Logger log = LoggerFactory.getLogger(RedisLock.class);
//最大重试次数
private static final Integer MAX_RETRY_COUNT=3;
//锁前缀
private static final String LOCK_PRE_FIX="lockPreFix";
//键
private static final String LOCK_KEY="lockKey";
//超时时间
private static final String TIME_OUT="timeOut";
//保护时间 2*2^11 =4096
private static final int PROTECT_TIME= 2 << 11;
@Autowired
private CommonRedisHelper commonRedisHelper;
//切点
@Pointcut("@annotation(com.xz.jdk11.schedule.aop.RedisLock)")
public void RedisLockAspect(){
}
//通知
@Around(value="RedisLockAspect()")
public void lockRoundAction(ProceedingJoinPoint proceeding){
//获取redis锁
boolean flag = this.getLock(proceeding, 0, System.currentTimeMillis());
if(flag){
try {
proceeding.proceed();
Thread.sleep(PROTECT_TIME);
} catch (Throwable e) {
throw new RuntimeException("定时任务======>>>redis分布式锁执行发生异常:"+e.getMessage(),e);
}finally {
//删除锁
this.delLock(proceeding);
}
}else{
log.info("定时任务======>>>其他服务器正在执行此定时任务");
}
}
private boolean getLock(ProceedingJoinPoint proceeding,int count,long currentTime){
//获取锁参数
Map<String, Object> annotationArgs = this.getAnnotationArgs(proceeding);
String lockPreFix = (String) annotationArgs.get(LOCK_PRE_FIX);
String lockKey = (String) annotationArgs.get(LOCK_KEY);
long timeOut = (Long) annotationArgs.get(TIME_OUT);
if(StrUtil.isEmpty(lockPreFix) || StrUtil.isEmpty(lockKey)){
throw new RuntimeException("定时任务======>>>RedisLock 锁前缀(LOCK_PRE_FIX)或者锁名(LOCK_KEY)未设置");
}
if(commonRedisHelper.setNx(lockPreFix,lockKey,timeOut)){
log.info("定时任务======>>>RedisLock:{}线程,已获取到锁",Thread.currentThread().getName());
return true;
}else{
//如果当前时间与锁的时间差,大于保护时间,则强制删除锁(防止死锁)
long creatTime = commonRedisHelper.getLockValue(lockPreFix, lockKey);
if((currentTime - creatTime) >timeOut * 1000 + PROTECT_TIME){
count ++;
if(count > MAX_RETRY_COUNT){
return false;
}
commonRedisHelper.delete(lockPreFix,lockKey);
getLock(proceeding,count,currentTime);
}
log.info("定时任务======>>>正在执行定时任务key:{}",lockKey);
log.info("定时任务======>>>RedisLock===={}线程,获取锁失败",Thread.currentThread().getName());
return false;
}
}
private void delLock(ProceedingJoinPoint proceedingJoinPoint){
//获取锁参数
Map<String, Object> annotationArgs = this.getAnnotationArgs(proceedingJoinPoint);
String lockPreFix = (String) annotationArgs.get(LOCK_PRE_FIX);
String lockKey = (String) annotationArgs.get(LOCK_KEY);
//删除锁
commonRedisHelper.delete(lockPreFix,lockKey);
}
public Map<String,Object> getAnnotationArgs(ProceedingJoinPoint proceeding){
Class<?> target = proceeding.getTarget().getClass();
//获取所有方法
Method[] methods = target.getMethods();
//获取方法名称
String methodName = proceeding.getSignature().getName();
for(Method method:methods){
if(method.getName().equals(methodName)){
HashMap<String, Object> hashMap = new HashMap<>();
RedisLock redisLock = method.getAnnotation(RedisLock.class);
hashMap.put(LOCK_PRE_FIX,redisLock.lockPrefix());
hashMap.put(LOCK_KEY,redisLock.lockKey());
hashMap.put(TIME_OUT,redisLock.timeUtil().toSeconds(redisLock.TimeOut()));
return hashMap;
}
}
return new HashMap<>();
}
}
redis命令操作类
package com.xz.jdk11.schedule.aop;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Component;
import java.util.concurrent.TimeUnit;
@Component
public class CommonRedisHelper {
@Autowired
RedisTemplate<Object,Object> redisTemplate;
public boolean setNx(String track,String sector,long timeout){
boolean flag =false;
ValueOperations<Object, Object> valueOperations = redisTemplate.opsForValue();
flag=valueOperations.setIfAbsent(track+sector,System.currentTimeMillis());
if(flag){
valueOperations.set(track+sector,getLockValue(track,sector),timeout, TimeUnit.SECONDS);
}
return flag;
}
public void delete(String lockPreFix,String key){
redisTemplate.delete(lockPreFix+key);
}
public long getLockValue(String track,String sector){
return (long) redisTemplate.opsForValue().get(track+sector);
}
}
定时任务一中添加自定义注解,如下图:
完整代码如下:
package com.xz.jdk11.schedule;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import java.util.Calendar;
@Slf4j
@Component
public class TaskOne implements BaskTask{
@Value("${upload.taskOnecron}")
private String taskOnecron;
@Override
public String getCron() {
return taskOnecron;
}
@Override
public void execute() {
log.info("定时任务一(每天几点几分执行一次),执行开始时间:{}",Calendar.getInstance().getTime());
}
@Override
@RedisLock(lockKey = "run",TimeOut = 60)
public void run() {
execute();
}
}
定时任务二中添加自定义注解,如下图:
完整代码如下:
package com.xz.jdk11.schedule;
import com.xz.jdk11.schedule.aop.RedisLock;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import java.util.Calendar;
@Slf4j
@Component
public class TaskTwo implements BaskTask{
@Value("${upload.taskTwocron}")
private String taskTwocron;
@Override
public String getCron() {
return taskTwocron;
}
@Override
public void execute() {
log.info("定时任务二:每几分钟执行一次,执行开始时间:{}", Calendar.getInstance().getTime());
}
@Override
@RedisLock(lockKey = "run",TimeOut = 60)
public void run() {
execute();
}
}
输出结果如下所示:
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