刚刚尝试将一些 swingx-ws 组件添加到整个 swinglabs 演示中 - 并注意到与本地加载相比，一个简单的 JXMapKit/-Viewer 在webstartable中加载图块的速度要慢几个数量级。
相当迷失在我应该从哪里开始寻找（ui 更新似乎在 EDT 上，但可能需要仔细查看）：
- 还有其他人经历不同的加载时间吗？
- 任何猜测可能是什么原因？
- 如何调试 webstartable？
代码相当简单（要在本地运行，您需要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：
似乎它与网络上下文中的权限检查有某种关系：分析表明整个连接调用堆栈是不同的（不过分令人惊讶）并且需要很长时间。暂时放弃..
编辑 2：
似乎有2个不同的问题
- 正如@Howard 已经指出的那样，打开连接以在安全受限的上下文中加载磁贴所需的时间稍长，即 JavaWebStartSecurity.checkConnect(String, int) 中的热点。
- 一个相当奇怪的 EDT 阻塞似乎只有在 mapKit 用于 SingleFrameApplication（BSAF）时才会发生
要重现阻塞，运行SimpleWSDemoApp，等到地图可见（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 完全被阻塞。在普通帧（顶部的参考）上执行相同操作会等待初始加载，但无法重现阻塞。
奇怪的事情（对我来说）是什么阻止了 EDT，来自 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)
即拖动鼠标会检查剪贴板访问权限...