Spring Boot Asynchronous Request Processing Task Executor Configuration - spring-boot

Question

From this doc I have learned that, now we can return Callable<T> from any action method. And spring will execute this action in a separate thread with the help of a TaskExecutor. This blog only says that this TaskExecutor is configurable. But I did not find a way to configure this TaskExecutor in spring boot application. Can anyone help me?
My another question is should I worry about the configuration of this TaskExecutor like threadpool size, queue size etc?
As pkoli asked, here is my Main class
#SpringBootApplication
public class MyWebApiApplication extends SpringBootServletInitializer {
public static void main(String[] args) {
SpringApplication.run(MyWebApiApplication.class, args);
}
#Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(MyWebApiApplication.class);
}
#Bean
public Executor asyncExecutor() {
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setCorePoolSize(10);
executor.setMaxPoolSize(10);
executor.setQueueCapacity(100);
executor.setThreadNamePrefix("MyThread-");
executor.initialize();
return executor;
}
}

Answer 1

Finally found answer here
To use other implementation of TaskExecutor we can extend our configuration class from WebMvcConfigurerAdapter or we can use it as bean. For example in a boot application:
#SpringBootApplication
public class AsyncConfigExample{
#Bean
WebMvcConfigurer configurer(){
return new WebMvcConfigurerAdapter(){
#Override
public void configureAsyncSupport (AsyncSupportConfigurer configurer) {
ThreadPoolTaskExecutor t = new ThreadPoolTaskExecutor();
t.setCorePoolSize(10);
t.setMaxPoolSize(100);
t.setQueueCapacity(50);
t.setAllowCoreThreadTimeOut(true);
t.setKeepAliveSeconds(120);
t.initialize();
configurer.setTaskExecutor(t);
}
};
}
public static void main (String[] args) {
SpringApplication.run(AsyncConfigExample.class, args);
}
}

Answer 2

To create a task executor simply create a bean as follows with the configuration that suits your requirement.
#Bean
public Executor asyncExecutor() {
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setCorePoolSize(1);
executor.setMaxPoolSize(1);
executor.setQueueCapacity(100);
executor.setThreadNamePrefix("MyThread-");
executor.initialize();
return executor;
}
Regarding the second part of your question, Yes the configuration needs to be provided keeping in mind your application.
Here's an explanation from the javadoc.
When a new task is submitted in method execute(java.lang.Runnable), and fewer than corePoolSize threads are running, a new thread is created to handle the request, even if other worker threads are idle. If there are more than corePoolSize but less than maximumPoolSize threads running, a new thread will be created only if the queue is full.