I have the following 3 classes:
ComponantA
package mytest.spring.test.spring;
import org.apache.log4j.Logger;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
@Component
public class ComponentA {
Logger log = Logger.getLogger(ComponentB.class);
@Scheduled(fixedRate=2000)
public void sayHello() {
for(int i=1 ; i<=5 ; i++) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
log.info("Hello from ComponentA " + i);
}
}
}
ComponentB
package mytest.spring.test.spring;
import org.apache.log4j.Logger;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
@Component
public class ComponentB {
Logger log = Logger.getLogger(ComponentB.class);
@Scheduled(fixedRate=2000)
public void sayHello() {
for(int i=1 ; i<=3 ; i++) {
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
log.info("Hello from ComponentB " + i);
}
}
}
MyApplication
package mytest.spring.test.spring;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;
@SpringBootApplication
@EnableScheduling
public class MyApplication {
public static void main(String[] args) {
SpringApplication.run(MyApplication.class, args);
}
}
When I execute it, I'm getting the following output:
Hello from ComponentA 1
Hello from ComponentA 2
Hello from ComponentA 3
Hello from ComponentA 4
Hello from ComponentA 5
Hello from ComponentB 1
Hello from ComponentB 2
Hello from ComponentB 3
Hello from ComponentA 1
Hello from ComponentA 2
Hello from ComponentA 3
Hello from ComponentA 4
Hello from ComponentA 5
Hello from ComponentB 1
Hello from ComponentB 2
Hello from ComponentB 3
...
I need the 2 Scheduled methods to run in parallel, which is clearly not the cae according to the output I'm getting. I read that it should be possible to provide the @Schedule annotation with a custom TaskExecutor, with which it should be possible to define how many thread we want ...
Am I right ? I can't find how to provide this information.
The documentation clearly states that:
By default, will be searching for an associated scheduler definition: either a unique
TaskScheduler
bean in the context, or aTaskScheduler
bean named "taskScheduler" otherwise; the same lookup will also be performed for aScheduledExecutorService
bean. If neither of the two is resolvable, a local single-threaded default scheduler will be created and used within the registrar.When more control is desired, a @Configuration class may implement SchedulingConfigurer. This allows access to the underlying ScheduledTaskRegistrar instance. For example, the following example demonstrates how to customize the Executor used to execute scheduled tasks:
@Configuration @EnableScheduling public class AppConfig implements SchedulingConfigurer { @Override public void configureTasks(ScheduledTaskRegistrar taskRegistrar) { taskRegistrar.setScheduler(taskExecutor()); } @Bean(destroyMethod="shutdown") public Executor taskExecutor() { return Executors.newScheduledThreadPool(100); } }