uitest/src/main/java/com/vaadin/tests/performance/ThreadMemoryLeaksTest.java


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54

package com.vaadin.tests.performance;

import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

import com.vaadin.server.VaadinRequest;
import com.vaadin.tests.components.AbstractReindeerTestUI;
import com.vaadin.ui.Button;
import com.vaadin.ui.Label;

public class ThreadMemoryLeaksTest extends AbstractReindeerTestUI {

    public static class Worker {
        long value = 0;
        private TimerTask task = new TimerTask() {
            @Override
            public void run() {
                value++;
            }
        };
        private final Timer timer = new Timer(true);

        public Worker() {
            timer.scheduleAtFixedRate(task, new Date(), 1000);
        }
    }

    int workers = 0;
    Label label;

    @Override
    protected void setup(VaadinRequest request) {
        label = new Label(String.format("%d workers", workers));
        addComponent(label);
        addComponent(new Button("Add worker", event -> {
            new Worker();
            workers++;
            label.setValue(String.format("%d workers", workers));
        }));
    }

    @Override
    protected String getTestDescription() {
        return "Inherited ThreadLocals should not leak memory. Clicking the "
                + "button starts a new thread, after which memory consumption "
                + "can be checked with visualvm";
    }

    @Override
    protected Integer getTicketNumber() {
        return 12401;
    }
}