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Thread test
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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++; | |
} | |
} |
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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