Spring Async get current Executor - spring-boot

Question

I am using Spring Async by implementing AsyncConfigurer and overriding the getAsyncExecutor to define my Executor.
Now I would like to expose an endpoint, to return the current queue size, number of threads ...etc, of the Executor that is used by Async.
But I could not find a way to find or autowire the current executor that is used by Async.
I was thinking I can define a bean, that will be both used by the getAsyncExecutor method, and my reporting service.
But I was wondering if there is an easier/more appropriate way I can interact with async to get the current Executor.
My current config:
#Configuration
#EnableAsync
public class AsyncConfiguration implements AsyncConfigurer {
#Override
public Executor getAsyncExecutor() {
final ThreadPoolTaskExecutor threadPoolTaskExecutor = new ThreadPoolTaskExecutor();
threadPoolTaskExecutor.setThreadNamePrefix("async-thread-");
threadPoolTaskExecutor.setCorePoolSize(2);
threadPoolTaskExecutor.setMaxPoolSize(2);
threadPoolTaskExecutor.setQueueCapacity(100);
threadPoolTaskExecutor.initialize();
return threadPoolTaskExecutor;
}
}

Answer 1

You haven't registered a bean for the ThreadPoolTaskExector.
#Configuration
#EnableAsync
public class AsyncConfiguration implements AsyncConfigurer {
#Override
public Executor getAsyncExecutor() {
return taskExecutor();
}
#Bean
public ThreadPoolTaskExecutor taskExecutor() {
ThreadPoolTaskExecutor threadPoolTaskExecutor = new ThreadPoolTaskExecutor();
threadPoolTaskExecutor.setThreadNamePrefix("async-thread-");
threadPoolTaskExecutor.setCorePoolSize(2);
threadPoolTaskExecutor.setMaxPoolSize(2);
threadPoolTaskExecutor.setQueueCapacity(100);
return threadPoolTaskExecutor;
}
}
However Spring Boot 2.1 already pre-configures a TaskExecutor for you which you can configure through properties. You can then remove all config and only use #EnableAsync in your configuration.
spring.task.execution.pool.core-size=2
spring.task.execution.pool.max-size=2
spring.task.execution.pool.queue-capacity=100
spring.task.exection.thread-name-prefix=async-thread-
This configuration, together with a single #EnableAsync will achieve the same, without additional configuration.
With either configuration, you can now use #Autowired to get the instance in your service.