java - Spring Boot 中是否有一个全局标志来禁用所有计划作业？

Question

我有两个作业，第一个作业每 2 秒运行一次，第二个作业每 10 秒运行一次。我在 application.properties 中设置了他们的 cron 表达式，并意识到可以通过将其 cron 表达式修改为 来禁用每个作业>application.properties 文件中的“-”。

但真的很想知道 Spring Boot 中是否有一个全局标志可以一次性禁用所有作业？

尝试了以下操作，但在服务器启动时出现错误。

pom.xml

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.6.RELEASE</version>
    <relativePath />
</parent>

application.properties

#global flag for all jobs
spring.enable.scheduling=false
jobs.greet.cron=0/2 * * * * ? 
jobs.email.cron=0/10 * * * * ?

DemoApplication.java

@SpringBootApplication
@EnableScheduling
@ConditionalOnProperty(name = "spring.enable.scheduling", matchIfMissing = true, havingValue = "true")
public class DemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

GreetJob.java

@Component
@Log4j2
public class GreetJob {

    @Scheduled(cron = "${jobs.greet.cron}")
    public void greet() {
        log.info("Starting greet now...");
    }

}

EmailJob.java

@Component
@Log4j2
public class EmailJob {

    @Scheduled(cron = "${jobs.email.cron}")
    public void sendEmail() {
        log.info("Sending email now...");
    }

}

异常(exception):

2020-05-23 15:51:04,536 ERROR org.springframework.boot.SpringApplication [restartedMain] Application run failed
org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.context.ApplicationContextException: Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean.
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:156)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:544)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
    at com.example.DemoApplication.main(DemoApplication.java:27)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
Caused by: org.springframework.context.ApplicationContextException: Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean.
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.getWebServerFactory(ServletWebServerApplicationContext.java:203)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:179)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:153)
    ... 13 common frames omitted

Answer 1

默认情况下，没有这样的选项，但是如果您将 @EnableScheduling 放在使用 @Conditional< 人工创建的配置上，则可以为该工具提供“全局”标志 就可以了。这样，您就不需要通过在其上放置 @Conditional 来更改已定义的计划作业(在您的情况下为 GreetJob 和 EmailJob)，并且将为此设施提供单一管理点:

因此，要创建“人工”配置，请创建以下内容:

@Configuration
@EnableScheduling
@ConditionalOnProperty(name="jobs.enabled", havingValue = "true")
public class ConditionalEnableScheduling {
}

这样，如果您使用 --jobs.enabled 启动应用程序，条件将“触发”并且配置将加载，以便初始化“调度基础设施”

一般说明(只是为了答案的完整性):

• 从主类中删除@EnableScheduling
• 确保扫描此配置(例如将其放在主类旁边)