Thread test

gistfile1.java

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/")
public class Test extends HttpServlet {
	private static final long serialVersionUID = 1L;

	static class MyContext {
		int i = 0; // default value
	}

	static ThreadLocal<MyContext> myThreadLocal = ThreadLocal
			.withInitial(() -> {
				return new MyContext();
			}); // thread local.

	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		MyContext context = myThreadLocal.get();
		// get thread local or initialized local if first get.

		Thread currentThread = Thread.currentThread();

		System.out.println(String.format("%s \t: count %d",
				currentThread.toString(), context.i));

		context.i++;
	}
}

run

ab -n 64 -c 8 http://localhost:8080/ThreadTest/

result

Thread[http-nio-8080-exec-8,5,main] : count 0
Thread[http-nio-8080-exec-12,5,main] : count 0
Thread[http-nio-8080-exec-13,5,main] : count 0
Thread[http-nio-8080-exec-6,5,main] : count 0
Thread[http-nio-8080-exec-11,5,main] : count 0
Thread[http-nio-8080-exec-3,5,main] : count 0
Thread[http-nio-8080-exec-4,5,main] : count 0
Thread[http-nio-8080-exec-9,5,main] : count 0
Thread[http-nio-8080-exec-8,5,main] : count 1
Thread[http-nio-8080-exec-10,5,main] : count 0
Thread[http-nio-8080-exec-8,5,main] : count 2
Thread[http-nio-8080-exec-14,5,main] : count 0
Thread[http-nio-8080-exec-12,5,main] : count 1
Thread[http-nio-8080-exec-12,5,main] : count 2
Thread[http-nio-8080-exec-4,5,main] : count 1
Thread[http-nio-8080-exec-12,5,main] : count 3
Thread[http-nio-8080-exec-4,5,main] : count 2
Thread[http-nio-8080-exec-6,5,main] : count 1
Thread[http-nio-8080-exec-4,5,main] : count 3
Thread[http-nio-8080-exec-9,5,main] : count 1
Thread[http-nio-8080-exec-10,5,main] : count 1
Thread[http-nio-8080-exec-9,5,main] : count 2
Thread[http-nio-8080-exec-9,5,main] : count 3
Thread[http-nio-8080-exec-9,5,main] : count 4
Thread[http-nio-8080-exec-10,5,main] : count 2
Thread[http-nio-8080-exec-8,5,main] : count 3
Thread[http-nio-8080-exec-11,5,main] : count 1
Thread[http-nio-8080-exec-10,5,main] : count 3
Thread[http-nio-8080-exec-14,5,main] : count 1
Thread[http-nio-8080-exec-14,5,main] : count 2
Thread[http-nio-8080-exec-14,5,main] : count 3
Thread[http-nio-8080-exec-3,5,main] : count 1
Thread[http-nio-8080-exec-12,5,main] : count 4
Thread[http-nio-8080-exec-6,5,main] : count 2
Thread[http-nio-8080-exec-4,5,main] : count 4
Thread[http-nio-8080-exec-12,5,main] : count 5
Thread[http-nio-8080-exec-4,5,main] : count 5
Thread[http-nio-8080-exec-5,5,main] : count 0
Thread[http-nio-8080-exec-6,5,main] : count 3
Thread[http-nio-8080-exec-9,5,main] : count 5
Thread[http-nio-8080-exec-11,5,main] : count 2
Thread[http-nio-8080-exec-6,5,main] : count 4
Thread[http-nio-8080-exec-11,5,main] : count 3
Thread[http-nio-8080-exec-5,5,main] : count 1
Thread[http-nio-8080-exec-6,5,main] : count 5
Thread[http-nio-8080-exec-10,5,main] : count 4
Thread[http-nio-8080-exec-3,5,main] : count 2
Thread[http-nio-8080-exec-8,5,main] : count 4
Thread[http-nio-8080-exec-14,5,main] : count 4
Thread[http-nio-8080-exec-12,5,main] : count 6
Thread[http-nio-8080-exec-4,5,main] : count 6
Thread[http-nio-8080-exec-3,5,main] : count 3
Thread[http-nio-8080-exec-6,5,main] : count 6
Thread[http-nio-8080-exec-5,5,main] : count 2
Thread[http-nio-8080-exec-10,5,main] : count 5
Thread[http-nio-8080-exec-9,5,main] : count 6
Thread[http-nio-8080-exec-11,5,main] : count 4
Thread[http-nio-8080-exec-8,5,main] : count 5
Thread[http-nio-8080-exec-14,5,main] : count 5
Thread[http-nio-8080-exec-12,5,main] : count 7
Thread[http-nio-8080-exec-4,5,main] : count 7
Thread[http-nio-8080-exec-3,5,main] : count 4
Thread[http-nio-8080-exec-6,5,main] : count 7
Thread[http-nio-8080-exec-10,5,main] : count 6