我使用 @Scheduled 注释在Spring中使用cron样式的patten定义计划作业。
cron模式存储在配置属性文件中。实际上有两个属性文件：一个默认配置和一个与环境相关的配置文件配置（例如dev，test，prod客户1，prod客户2等），并覆盖某些默认值。
我在我的spring上下文中配置了一个属性占位符bean，它允许我使用 $ {} 样式占位符从属性文件中导入值。 / p>
作业bean类似如下：
@Component public class ImagesPurgeJob implements Job { private Logger logger = Logger.getLogger（this.getClass（））; @Override @Transactional（readOnly = true） @Scheduled（cron =$ {jobs.mediafiles.imagesPurgeJob.schedule}） public void execute （）{ // Do something //可以使用DAO或其他自动装配的bean } }我的上下文XML的相关部分：
通过注释启用计划任务配置 - > < task：annotation-driven /> <！ - 加载配置文件并允许'$ {}'样式占位符 - > < bean class =org.springframework.context.support.PropertySourcesPlaceholderConfigurer> < property name =locations> < list> < value> classpath：config / default-config.properties< / value> < value> classpath：config / environment-config.properties< / value> < / list> < / property> < property name =ignoreUnresolvablePlaceholdersvalue =true/> < property name =ignoreResourceNotFoundvalue =false/> < / bean>我真的很喜欢这个。
但是，我还有一个要求：在某些情况下，其中一些工作可以完全禁用。
所以，在我使用Spring管理它们之前，我们手动创建它们，并且有一个布尔参数以及配置文件中的cron参数，用于指定是否必须启用该作业： / p>
jobs.mediafiles.imagesPurgeJob.enable = true或false jobs.mediafiles.imagesPurgeJob.schedule = 0 0 0 / 12 * *？如何在Spring中使用此参数有条件地创建或只是简单地忽略bean config参数？
一个显而易见的解决方法是定义一个永远不会评估的cron模式，因此作业不会被执行。但是bean仍然会被创建，配置会有点模糊，所以我觉得必须有一个更好的解决方案。
任何想法？
解决方案@Component public class ImagesPurgeJob implements Job { 私人记录器logger = Logger.getLogger（this.getClass（））; @Value（$ {jobs.mediafiles.imagesPurgeJob.enable}） private boolean imagesPurgeJobEnable; @Override @Transactional（readOnly = true） @Scheduled（cron =$ {jobs.mediafiles.imagesPurgeJob.schedule}） public void execute （）{ //做某事 //可以使用DAO或其他自动装配的bean if（imagesPurgeJobEnable）{ here ... } }
p>
I am defining scheduled jobs with cron style pattenrs in Spring, using the @Scheduled annotation.
The cron pattern is stored in a config properties file. Actually there are two properties files : one default config, and one profile config that is environment dependent (e.g. dev, test, prod customer 1, prod customer 2 etc.) and overrides some of the default values.
I configured a property placeholder bean in my spring context which allows me to use ${} style placeholders to import values from my properties files.
The job beans looks like this :
@Component public class ImagesPurgeJob implements Job { private Logger logger = Logger.getLogger(this.getClass()); @Override @Transactional(readOnly=true) @Scheduled(cron = "${jobs.mediafiles.imagesPurgeJob.schedule}") public void execute() { //Do something //can use DAO or other autowired beans here } }Relevant parts of my context XML :
<!-- Enable configuration of scheduled tasks via annotations --> <task:annotation-driven/> <!-- Load configuration files and allow '${}' style placeholders --> <bean class="org.springframework.context.support.PropertySourcesPlaceholderConfigurer"> <property name="locations"> <list> <value>classpath:config/default-config.properties</value> <value>classpath:config/environment-config.properties</value> </list> </property> <property name="ignoreUnresolvablePlaceholders" value="true"/> <property name="ignoreResourceNotFound" value="false"/> </bean>I really like this. It's quite simple and clean with minimal XML.
However I have one more requirement : some of these jobs can be totally disabled in some cases.
So, before I used Spring to manage them I created them manually and there is a boolean parameter along with the cron parameter in the config files, to specify if the job has to be enabled or not :
jobs.mediafiles.imagesPurgeJob.enable=true or false jobs.mediafiles.imagesPurgeJob.schedule=0 0 0/12 * * ?How can I use this parameter in Spring to conditionally create or just plainly ignore the bean, depending on this config parameter ?
One obvious workaround would be to define a cron pattern that would never evaluate, so the job is never executed. But the bean would still be created and the config would be a bit obscure, so I feel there must be a better solution.
Any idea ?
解决方案 @Component public class ImagesPurgeJob implements Job { private Logger logger = Logger.getLogger(this.getClass()); @Value("${jobs.mediafiles.imagesPurgeJob.enable}") private boolean imagesPurgeJobEnable; @Override @Transactional(readOnly=true) @Scheduled(cron = "${jobs.mediafiles.imagesPurgeJob.schedule}") public void execute() { //Do something //can use DAO or other autowired beans here if(imagesPurgeJobEnable){ Do your conditional job here... } }}
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