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TracerSchedulingAutoConfiguration.java
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TracerSchedulingAutoConfiguration.java
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package org.zalando.tracer.spring;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.scheduling.annotation.SchedulingConfiguration;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.concurrent.ConcurrentTaskScheduler;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;
import org.zalando.tracer.Tracer;
import java.util.concurrent.ScheduledExecutorService;
import static java.util.concurrent.Executors.newScheduledThreadPool;
import static org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.DEFAULT_TASK_SCHEDULER_BEAN_NAME;
import static org.zalando.tracer.concurrent.TracingExecutors.manage;
@Configuration
@ConditionalOnClass(Scheduled.class)
@ConditionalOnProperty(name = "tracer.scheduling.enabled", havingValue = "true", matchIfMissing = true)
@AutoConfigureAfter({TracerAutoConfiguration.class, SchedulingConfiguration.class})
@Import(TracerSchedulingAutoConfiguration.TaskSchedulerConfiguration.class)
public class TracerSchedulingAutoConfiguration implements SchedulingConfigurer {
/**
* Needed because we require it inside {@link #configureTasks(ScheduledTaskRegistrar)} already.
*/
@Configuration
@ConditionalOnMissingBean(name = DEFAULT_TASK_SCHEDULER_BEAN_NAME)
public static class TaskSchedulerConfiguration {
@Bean(destroyMethod = "shutdown")
@ConditionalOnMissingBean(name = "taskSchedulerService")
public ScheduledExecutorService taskSchedulerService() {
return newScheduledThreadPool(Runtime.getRuntime().availableProcessors());
}
@Bean(name = DEFAULT_TASK_SCHEDULER_BEAN_NAME)
public TaskScheduler taskScheduler(final ScheduledExecutorService taskSchedulerService, final Tracer tracer) {
return new ConcurrentTaskScheduler(manage(taskSchedulerService, tracer));
}
}
private final TaskScheduler scheduler;
@Autowired
public TracerSchedulingAutoConfiguration(
@Qualifier(DEFAULT_TASK_SCHEDULER_BEAN_NAME) final TaskScheduler scheduler) {
this.scheduler = scheduler;
}
@Override
public void configureTasks(final ScheduledTaskRegistrar registrar) {
registrar.setTaskScheduler(scheduler);
}
}