@Scheduled annotation in non-singletons

[zalizko]

Hi, did u tested spring scheduling with all scopes?

Maybe problem not in your plugin, but in my application scheduling works only in prototype scoped bean ... if I set (as needed) session scope - scheduling does not working. In Spring documentation I did not found any requirements related to scope in scheduling context.

@Configuration
@ComponentScan(basePackageClasses = ApplicationConfig.class)
@EnableScheduling
public class ApplicationConfig {
    ...
}

@Component
@Scope("session")
public class ProjectsPanel extends Panel {
    ...
    @Scheduled(fixedDelay = 1000)
    public void refresher() {
        LOGGER.debug(" -- task --");
    }
}

[xpoft]

Hi.

I've never tested it. Your ProjectsPanel has session scope. What scope have other UI components?

[zalizko]

Another one is:

@Component
@Scope("prototype")
public class MyVaadinUI extends UI {

    @Autowired
    ProjectsPanel projectsPanel;

    @Override
    protected void init(VaadinRequest request) {
        final HorizontalLayout layout = new HorizontalLayout();
        layout.setMargin(true);
        setContent(layout);
        layout.addComponent(projectsPanel);
    }

}

[xpoft]

UI has a prototype scope. Several UI instances have the same ProjectsPanel? Is this working well?

[zalizko]

Actually I don't know :-) For now I have only one UI and I don't need more UI's ..

[xpoft]

MyVaadinUI has a prototype scope. For each new page, it'll create new instance. They'll use the same ProjectsPanel instance. I don't think that's working well. I can try to test it, later.

[zalizko]

It seems that problem is in spring and not in your addon. I just created the basic Spring Application and tested Scheduled annotation on it. Works only in singleton scoped beans.

schedulingTest/src/main/java/ee/zalizko/study/springscheduling/HelloApp.java:

public class HelloApp {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("spring-config.xml");
        HelloService helloService = context.getBean(HelloService.class);
        System.out.println(helloService.sayHello());
    }
}

schedulingTest/src/main/java/ee/zalizko/study/springscheduling/HelloService.java:

@Component
@Scope("prototype")
public class HelloService {
    public String sayHello() {
        return "Hello world!";
    }

    @Scheduled(fixedDelay = 1000)
    public void someJob() {
        System.out.println("job");
    }
}

schedulingTest/src/main/resources/spring-config.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tasks="http://www.springframework.org/schema/task"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task.xsd">
    <context:annotation-config />
    <tasks:annotation-driven />
    <context:component-scan base-package="ee.zalizko.study.springscheduling"/>
</beans>

As a result in console only:

Hello world!

If scope is not defined obviously (singleton scope) then scheduling works fine.

[arshabh]

Was anyone able to schedule in prototype scoped bean?