记一次elastic-job使用

当当的elastic-job定时任务

业务场景是定时从微信取accesstoken和jsticket，因为都只有7200秒的有效时间，所以设置了定时任务，定时将得到的数据存到redis缓存中

问题1：但是刚开始的时候将业务写在实现了simplejob类的类中，需要注入RedisCacheManager，结果发现是不能拿到的

所以更改了配置文件jobRegisterSupport

问题2：而且这个工作类的cron不管本地怎么改都不能改动，因为数据是从注册中心拿到的，所以在jobconfiguration中配置了overwrite为true，这样可以覆盖掉注册中心的配置

Elastic-Job-Lite采用无中心化设计，若每个客户端的配置不一致，不做控制的话，最后一个启动的客户端配置将会成为注册中心的最终配置。

Elastic-Job-Lite提出了overwrite概念，可通过JobConfiguration或Spring命名空间配置。overwrite=true即允许客户端配置覆盖注册中心，反之则不允许。如果注册中心无相关作业的配置，则无论overwrite是否配置，客户端配置都将写入注册中心。

原先的：

@Bean
    public JobRegisterSupport jobRegisterSupport(CoordinatorRegistryCenter coordinatorRegistryCenter, ApplicationContextOwner applicationContextOwner){
        ElasticJobClassScanner scanner = new ElasticJobClassScanner();
        scanner.addIncludeFilter(new AssignableTypeFilter(ElasticJob.class) {
            @Override
            protected boolean matchClassName(String className) {
                return false;
            }
        });
        scanner.addExcludeFilter(new AnnotationTypeFilter(JobExclude.class) {
            @Override
            protected boolean matchClassName(String className) {
                return false;
            }
        });
        Set<Class> classes = scanner.doScan("*.*.jobInstance");//自己的工作类
        classes.forEach(clazz ->Arrays.stream(JobConfig.JobElement.values()).forEach(jobElement -> {
            if (clazz == jobElement.getJobClass()){
                JobCoreConfiguration jobCoreConfiguration = JobCoreConfiguration.newBuilder(jobElement.getJobName(), jobElement.getCron(), jobElement.getShardingTotalCount()).build();
                SimpleJobConfiguration simpleJobConfiguration = new SimpleJobConfiguration(jobCoreConfiguration, clazz.getCanonicalName());
                LiteJobConfiguration simpleJobRootConfig = LiteJobConfiguration.newBuilder(simpleJobConfiguration).build();
                JobScheduler jobScheduler = new JobScheduler(coordinatorRegistryCenter, simpleJobRootConfig);
                jobScheduler.init();
                DefaultListableBeanFactory beanFactory = (DefaultListableBeanFactory)applicationContextOwner.getApplicationContext().getAutowireCapableBeanFactory();
                beanFactory.registerSingleton(clazz.getCanonicalName(),jobScheduler);
                return;
            }
        }));
        return new JobRegisterSupport();
    }

改过的：

@Bean
    public JobRegisterSupport jobRegisterSupport(CoordinatorRegistryCenter coordinatorRegistryCenter, ApplicationContextOwner applicationContextOwner){
        ElasticJobClassScanner scanner = new ElasticJobClassScanner();
        scanner.addIncludeFilter(new AssignableTypeFilter(ElasticJob.class) {
            @Override
            protected boolean matchClassName(String className) {
                return false;
            }
        });
        scanner.addExcludeFilter(new AnnotationTypeFilter(JobExclude.class) {
            @Override
            protected boolean matchClassName(String className) {
                return false;
            }
        });
        Set<Class> classes = scanner.doScan("*.*.job.jobInstance");
        classes.forEach(clazz ->Arrays.stream(JobConfig.JobElement.values()).forEach(jobElement -> {
            if (clazz == jobElement.getJobClass()){
                JobCoreConfiguration jobCoreConfiguration = JobCoreConfiguration.newBuilder(jobElement.getJobName(), jobElement.getCron(), jobElement.getShardingTotalCount()).build();
                SimpleJobConfiguration simpleJobConfiguration = new SimpleJobConfiguration(jobCoreConfiguration, clazz.getCanonicalName());
                LiteJobConfiguration liteJobConfiguration = LiteJobConfiguration.newBuilder(simpleJobConfiguration).overwrite(true).build();//加入了覆盖
                DefaultListableBeanFactory beanFactory = (DefaultListableBeanFactory)applicationContextOwner.getApplicationContext().getAutowireCapableBeanFactory();
                AbstractBeanDefinition ActualRawBeanDefinition = BeanDefinitionBuilder.genericBeanDefinition(clazz).setScope(BeanDefinition.SCOPE_SINGLETON).getRawBeanDefinition();
                beanFactory.registerBeanDefinition(clazz.getCanonicalName(),ActualRawBeanDefinition);
                SpringJobScheduler springJobScheduler = new SpringJobScheduler((SimpleJob)beanFactory.getBean(clazz), coordinatorRegistryCenter, liteJobConfiguration);
                springJobScheduler.init();
                beanFactory.registerSingleton("spring" + clazz.getCanonicalName(),springJobScheduler);
                return;
            }
        }));
        return new JobRegisterSupport();
    }