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SpringBoot动态定时功能实现方案详解

开发者 https://www.devze.com 2022-11-28 13:48 出处:网络 作者: smileNicky
目录业务场景环境准备实现方案归纳总结业务场景基于上篇程序,做了一版动态定时程序,然后发现这个定时程序需要在下次执行的时候会加载新的时间,所以如果改了定时程序不能马上触发,所以想到一种方法,在保存定时程...
目录
  • 业务场景
  • 环境准备
  • 实现方案
  • 归纳总结

业务场景

基于上篇程序,做了一版动态定时程序,然后发现这个定时程序需要在下次执行的时候会加载新的时间,所以如果改了定时程序不能马上触发,所以想到一种方法,在保存定时程序的时候将cron表达式传过去,然后触发定时程序,下面看看怎么实现

环境准备

开发环境

  • JDK 1.8
  • SpringBoot2.2.1
  • Maven 3.2+

开发工具

  • IntelliJ IDEA
  • smartGit
  • Navicat15

实现方案

基于上一版进行改进:

  • 先根据选择的星期生成cron表达式,保存到数据库里,同时更改cron表达式手动触发定时程序加载最新的cron表达式
  • 根据保存的cron表达式规则执行定时程序
  • 通过CommandLineRunner设置启动加载
  • 加上线程池,提高线程复用率和程序性能

加上ThreadPoolTaskScheduler,支持同步和异步两种方式:

import lombok.extern.slf4j.Slf4j;
import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.AsyncConfigurer;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;
import Java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadPoolExecutor;
@Configuration
@Slf4j
public class ScheduleConfig implements SchedulingConfigurer , AsyncConfigurer {
    @Override
    public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
        tajsskRegistrar.setjavascriptScheduler(taskScheduler());
    }
    @Bean(destroyMethod="shutdown" , name = "taskScheduler")
    public ThreadPoolTaskScheduler taskScheduler() {
        ThreadPoolTaskScheduler scheduler = new ThreadPoolTaskScheduler();
        scheduler.setPoolSize(10);
        scheduler.setThreadNamePrefix("itemTask-");
        scheduler.setAwaitTerminationSeconds(600);
        scheduler.setWaitForTasksToCompleteOnShutdown(true);
        return scheduler;
    }
    @Bean(name = "asyncExecutor")
    public ThreadPoolTaskExecutor asyncExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(10);
        executor.setQueueCapacity(1000);
        executor.setKeepAliveSeconds(600);
        executor.setMaxPoolSize(20);
        executor.setThreadNamePrefix("itemAsyncTask-");
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.initialize();
        return executor;
    }
    @Override
    public Executor getAsyncExecutor() {
        return asyncExecutor();
    }
    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return (throwable, method, objects) -> {
            log.error("异步任务异常,message {} , method {} , params" , throwable , method , objects);
        };
    }
}

加上一个SchedulerTaskJob接口:

public interface SchedulerTaskJob{
    void executeTask();
}

AbstractScheduler 抽象类,提供基本的功能

import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.Trigger;
import org.springframework.scheduling.TriggerContext;
import androidorg.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;
import org.springframework.scheduling.support.CronTrigger;
import org.springframework.stereotype.Component;
import javax.annotation.Resource;
import java.util.Date;
@Slf4j
@Component
@Data
public abstract class AbstractScheduler implements SchedulerTaskJob{
    @Resource(name = "taskScheduler")
    private ThreadPoolTaskScheduler threadPoolTaskScheduler;
    @Override
    public void executeTask() {
        String cron = getCronString();
        Runnable task = () -> {
            // 执行业务
            doBusiness();
        };
        Trigger trigger = new Trigger()   {
            @Override
            public Date nextExecutionTime(TriggerContext triggerContext) {
                CronTrigger trigger;
                try {
                    trigger = new CronTrigger(cron);
                    return trigger.nextExecutionTime(triggerContext);
                } catch (Exception e) {
                    log.error("cron表达式异常,已经启用默认配置");
                    // 配置cron表达式异常,执行默认的表达式
                    trigger = new CronTrigger(getDefaultCron());
                    return trigger.nextExecutionTime(triggerContext);
                }
            }
        };
        threadPoolTaskScheduler.schedule(task , trigger);
    }
    protected abstract String getCronString();
    protected abstract void doBusiness();
    protected abstract String getDefaultCron();
}

实现类,基于自己的业务实现,然后事项抽象类,通过模板模式进行编程

import cn.hutool.core.util.StrUtil;
import com.baomidou.myBATisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
import java.time.LocalDateTime;
@Service
@Slf4j
@Data
public class ItemSyncScheduler extends AbstractScheduler {
    @Value("${configtask.default.itemsync}")
    private String defaultCron ;
    private String cronString ;
    @Override
    protected String getCronString() {
        if (StrUtil.isNotBlank(cronString))  return cronString;
        SyncConfigModel configModel = syncConfigService.getOne(Wrappers.<SyncConfigModel>lambdaQuery()
                .eq(SyncConfigModel::getBizType, 1)
                .last("limit 1"));
        if (configModel == null) return defaultCron;
        return configModel.getCronStr();
    }
    @Override
    protected void doBusiness() {
        log.info("执行业务...");
        log.info("执行时间:{}"  , LocalDateTime.now());
       // 执行业务
    }
    @Override
    protected String getDefaultCron() {
        return defaultCron;
    }
}

如果更改了cron表达式,程序不会马上触发,所以直接开放一个接口出来,调用的时候,设置最新的表达式,然后重新调用定时程序

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
@Slf4j
public class ItemSchedulerController {
    private ItemSyncScheduler itemSyncScheduler;
    @Autowired
    public ItemSchedulerController(ItemSyncScheduler itemSyncScheduler) {
        this.itemSyncScheduler= itemSyncScheduler;
    }
    @GetMapping(value = "/updateItemCron")
    @ApiOperation(value = "更新cron表达式")
    public void updateItemCron(@RequestParam("cronString") String cronString) {
        log.info("更新cron表达式...");
        log.info("cronString:{}" , cronString);
        itemSyncScheduler.setCronString(cronString);
        itemSyncScheduler.executeTask();
    }
}

实现CommandLineRunner ,实现Springboot启动加载

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
import javax.annotation.Resource;
@Component
@Order(1)
public class SchedulerTaskRunner implements CommandLine开发者_JS学习Runner {
    private ItemSyncScheduler itemSyncScheduler;
    @Autowired
    public SchedulerTaskRunner(ItemSyncScheduler itemSyncScheduler) {
        this.itemSyncScheduler= itemSyncScheduler;
    }
    @Override
    public void run(String... args) throws Exception {
  http://www.devze.com      itemSyncScheduler.execuwww.devze.comteTask();
    }
}

归纳总结

基于上一版定时程序的问题,做了改进,加上了线程池和做到了动态触发,网上的资料很多都是直接写明使用SchedulingConfigurer来实现动态定时程序,不过很多都写明场景,本文通过实际,写明实现方法,本文是在保存定时程序的时候,设置最新的cron表达式,调一下接口重新加载,还可以使用canal等中间件监听数据表,如果改了就再设置cron表达式,然后触发程序

到此这篇关于SpringBoot动态定时功能实现方案详解的文章就介绍到这了,更多相关SpringBoot动态定时内容请搜索我们以前的文章或继续浏览下面的相关文章希望大家以后多多支持我们!

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