How to get thread id from a thread pool

Question

I have a fixed thread pool that I submit tasks to  limited to 5 threads   How can I find out which one of those 5 threads executes my task  something like  thread  3 of 5 is doing this task     ExecutorService taskExecutor   Executors newFixedThreadPool 5      in infinite loop  taskExecutor execute new MyTask           private class MyTask implements Runnable       public void run             logger debug  Thread   XXX is doing this task     how to get thread id

User · Answer

If your class inherits from Thread  you can use methods getName and setName to name each thread  Otherwise you could just add a name field to MyTask  and initialize it in your constructor

User · Answer

Using Thread currentThread     private class MyTask implements Runnable       public void run             long threadId   Thread currentThread   getId            logger debug  Thread       threadId     is doing this task

User · Answer

There is the way of current thread getting   Thread t   Thread currentThread      After you have got Thread class object  t  you are able to get information you need using Thread class methods   Thread ID gettting   long tId   t getId       e g  14291   Thread name gettting    String tName   t getName       e g   pool-29-thread-7

User · Answer

You can use Thread getCurrentThread getId    but why would you want to do that when LogRecord objects managed by the logger already have the thread Id  I think you are missing a configuration somewhere that logs the thread Ids for your log messages

User · Answer

If you are using logging then thread names will be helpful  A thread factory helps with this   import org slf4j Logger  import org slf4j LoggerFactory   import java util concurrent ExecutorService  import java util concurrent Executors  import java util concurrent ThreadFactory   public class Main        static Logger LOG   LoggerFactory getLogger Main class        static class MyTask implements Runnable           public void run                 LOG info  A pool thread is doing this task                         public static void main String   args            ExecutorService taskExecutor   Executors newFixedThreadPool 5  new MyThreadFactory             taskExecutor execute new MyTask             taskExecutor shutdown             class MyThreadFactory implements ThreadFactory       private int counter      public Thread newThread Runnable r            return new Thread r   My thread       counter               Output       My thread   0  Main         INFO  A pool thread is doing this task

User · Answer

The accepted answer answers the question about getting a thread id  but it doesn t let you do  Thread X of Y  messages  Thread ids are unique across threads but don t necessarily start from 0 or 1   Here is an example matching the question   import java util concurrent    class ThreadIdTest      public static void main String   args         final int numThreads   5      ExecutorService exec   Executors newFixedThreadPool numThreads        for  int i 0  i lt 10  i            exec execute new Runnable             public void run               long threadId   Thread currentThread   getId              System out println  I am thread     threadId     of     numThreads                                  exec shutdown            and the output   burhan orion  dev shm  javac ThreadIdTest java  amp  amp  java ThreadIdTest I am thread 8 of 5 I am thread 9 of 5 I am thread 10 of 5 I am thread 8 of 5 I am thread 9 of 5 I am thread 11 of 5 I am thread 8 of 5 I am thread 9 of 5 I am thread 10 of 5 I am thread 12 of 5   A slight tweak using modulo arithmetic will allow you to do  thread X of Y  correctly      modulo gives zero-based results hence the  1 long threadId   Thread currentThread   getId   numThreads  1    New results   burhan orion  dev shm  javac ThreadIdTest java  amp  amp  java ThreadIdTest   I am thread 2 of 5  I am thread 3 of 5  I am thread 3 of 5  I am thread 3 of 5  I am thread 5 of 5  I am thread 1 of 5  I am thread 4 of 5  I am thread 1 of 5  I am thread 2 of 5  I am thread 3 of 5

[java] How to get thread id from a thread pool?

Examples related to java

Examples related to multithreading

Examples related to threadpool

Examples related to executorservice

Examples related to executors