Alibaba tip: it is better to create threads manually

Original creation method

ExecutorService executorService = Executors.newFixedThreadPool(threadNum);

Ali's plug-in tips ： Creating threads manually works well
I looked at the explanation ： It is easy to cause OOM, As it happens , I had this problem before .
So I used the way recommended by Ali to wear threads

 ThreadFactory threadFactory = new ThreadFactoryBuilder().setNameFormat("thread-call-runner-%d").build();
        ThreadPoolExecutor executor = new ThreadPoolExecutor(threadNum, threadNum + 2, 500L, TimeUnit.MICROSECONDS, new LinkedBlockingDeque<>(), threadFactory);

The packages that need to be imported manually

import com.google.common.util.concurrent.ThreadFactoryBuilder;
import java.util.concurrent.TimeUnit;

ThreadPoolExecutor The parameters of are detailed as follows

public ThreadPoolExecutor(int corePoolSize,
                          int maximumPoolSize,
                          long keepAliveTime,
                          TimeUnit unit,
                          BlockingQueue<Runnable> workQueue,
                          ThreadFactory threadFactory,
                          RejectedExecutionHandler handler)



corePoolSize =>  Number of core threads in thread pool 
maximumPoolSize =>  Maximum number of thread pools 
keepAliveTime =>  Idle thread lifetime 
unit =>  Time unit 
workQueue =>  Buffer queue used by thread pool 
threadFactory =>  Thread pool creates the factory used by threads 
handler =>  The processing strategy of the thread pool to reject the task 

Alibaba Java Coding Guidelines It's really a good thing , You deserve it

Add something extra ：

import com.google.common.util.concurrent.ThreadFactoryBuilder;

The problem is due to the lack of dependencies

<dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>30.1-jre</version>
        </dependency>