JXMapKit/-Viewer非常慢,因为webstartable - 从哪里开始挖掘？

Question

只是尝试在整个swinglabs演示中添加一些swingx-ws组件 - 并注意到与本地加载相比,简单的JXMapKit/-Viewer在webstartable中加载tile的速度要慢几个数量级.

相当失去我应该开始寻找的地方(ui更新似乎在EDT上,但可能需要仔细看看):

• 是否有其他人遇到不同的加载时间？
• 可能是什么原因的猜测？
• 如何调试webstartable？

代码非常简单(要在本地运行,你需要swingx和swingx-ws:

public class WSDemo {

    private JComponent createContent() {
        JComponent content = new JPanel();
        content.setLayout(new BorderLayout());

        content.add(createMapKit()); 
        return content;
    }

    protected JComponent createMapKit() {
        final int max = 17;
        TileFactoryInfo info = new TileFactoryInfo(1, max - 2, max, 256, true,
                true, // tile size is 256 and x/y orientation is normal
                "http://tile.openstreetmap.org",// 5/15/10.png",
                "x", "y", "z") {
            public String getTileUrl(int x, int y, int zoom) {
                zoom = max - zoom;
                String url = this.baseURL + "/" + zoom + "/" + x + "/" + y
                        + ".png";
                return url;
            }

        };
        DefaultTileFactory tf = new DefaultTileFactory(info);
        tf.setThreadPoolSize(1);
        final JXMapKit kit = new JXMapKit();
        kit.setTileFactory(tf);
        kit.setZoom(10);
        kit.setAddressLocation(new GeoPosition(51.5, 0));
        kit.getMainMap().setDrawTileBorders(true);
        return kit;
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JFrame frame = new JFrame("");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new WSDemo().createContent());
                frame.setLocationByPlatform(true);
                frame.setSize(400, 400);
                frame.setVisible(true);
            }
        });
    }

}

编辑:

看起来它在某种程度上与Web上下文中的权限检查有关:分析显示整个连接调用堆栈是不同的(并不过分令人惊讶)并且需要很长时间.现在放弃..

编辑2:

似乎有两个不同的问题

• 正如@Howard已经指出的那样,在安全受限的上下文中打开用于加载切片的连接所需的时间稍长,这是JavaWebStartSecurity.checkConnect(String,int)中的热点.
• 只有在SingleFrameApplication(BSAF)中使用mapKit时才会发生相当奇怪的EDT阻塞

要重现阻塞,请运行SimpleWSDemoApp,等待地图可见(需要一些时间,这是第一个问题)然后使用鼠标快速上下移动缩放拇指:ui被完全阻止.在普通帧(顶部的引用)上执行相同操作会有初始加载等待,但无法重现阻塞.

奇怪的东西(对我来说)是什么阻止了EDT,从VisualVM的线程转储:

"AWT-EventQueue-0" prio=6 tid=0x063d3000 nid=0x1468 waiting for monitor entry [0x05efe000]
   java.lang.Thread.State: BLOCKED (on object monitor)
    at java.security.Permissions.implies(Unknown Source)
    - waiting to lock <0x29f7b118> (a java.security.Permissions)
    at sun.security.provider.PolicyFile.implies(Unknown Source)
    at java.security.ProtectionDomain.implies(Unknown Source)
    at java.security.AccessControlContext.checkPermission(Unknown Source)
    at java.security.AccessController.checkPermission(Unknown Source)
    at java.lang.SecurityManager.checkPermission(Unknown Source)
    at java.lang.SecurityManager.checkSystemClipboardAccess(Unknown Source)
    at java.awt.event.InputEvent.canAccessSystemClipboard(Unknown Source)
    at java.awt.event.InputEvent.<init>(Unknown Source)
    at java.awt.event.MouseEvent.<init>(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Window.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$200(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)

这是拖动鼠标踢检查剪贴板访问权限...

Answer 1

Web Start 应用程序也是一个 JVM 进程，因此您可以尝试使用VisualVM对其进行分析（本条目介绍了如何执行此操作）。还值得使用 VisualVM 分析这两个应用程序并比较 JVM 设置（例如堆大小、JIT 编译器差异）。我认为 Web Start 应用程序使用客户端编译器运行，通过生成本机代码，客户端编译器比服务器编译器慢。