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/*
@ITMillApache2LicenseForJavaFiles@
*/
package com.itmill.toolkit.demo;
import com.itmill.toolkit.terminal.PaintException;
import com.itmill.toolkit.terminal.PaintTarget;
import com.itmill.toolkit.ui.Label;
import com.itmill.toolkit.ui.Layout;
import com.itmill.toolkit.ui.OrderedLayout;
import com.itmill.toolkit.ui.TabSheet;
import com.itmill.toolkit.ui.Window;
/**
* This example is a (simple) demonstration of client-side caching. The content
* in one tab is intentionally made very slow to produce server-side. When the
* user changes to this tab for the first time, there will be a 3 second wait
* before the content shows up, but the second time it shows up immediately
* since the content has not changed and is cached client-side.
*
* @author IT Mill Ltd.
*/
public class CachingDemo extends com.itmill.toolkit.Application {
public void init() {
final Window main = new Window("Client-side caching example");
setMainWindow(main);
setTheme("example");
final TabSheet ts = new TabSheet();
main.addComponent(ts);
Layout layout = new OrderedLayout();
layout.setMargin(true);
Label l = new Label(
"This is a normal label, quick to render.<br/>The second tab will be slow to render the first time, after that it will be as quick as this one.");
l.setCaption("A normal label");
l.setContentMode(Label.CONTENT_XHTML);
layout.addComponent(l);
ts.addTab(layout, "Normal", null);
layout = new OrderedLayout();
layout.setMargin(true);
l = new Label(
"The first time you change to this tab, this label is very slow to produce (server-side).<br/> However, it will seem fast the second time you change to this tab, because it has not changed and is cached client-side.") {
public void paintContent(PaintTarget target) throws PaintException {
try {
Thread.sleep(3000);
} catch (final Exception e) {
// IGNORED
}
super.paintContent(target);
}
};
l.setCaption("A slow label");
l.setContentMode(Label.CONTENT_XHTML);
layout.addComponent(l);
ts.addTab(layout, "Slow", null);
}
}
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