Persistent Variables in ExecutorService (Java)

Question

I\'ve created a pool of 4 worker threads to process some files. In the test there\'s about 200 of them. The thread pool version is already about 3 times faster than doing it

Answer 1

Extend ThreadLocal for your class and override the initialValue() method. By default, it returns null.

private static class ThreadLocalGenerateSHA1 extends
  ThreadLocal {

  @Override
  protected GenerateSHA1 initialValue() {
    return new GenerateSHA1();
  }

}

private static final ThreadLocalGenerateSHA1 generateSHA1 = new ThreadLocalGenerateSHA1();

...

On the tasks, simply call the get() method of generateSHA1. You do not need to call set().