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/*
@ITMillApache2LicenseForJavaFiles@
*/
package com.vaadin.demo.featurebrowser;
import com.vaadin.terminal.PaintException;
import com.vaadin.terminal.PaintTarget;
import com.vaadin.ui.CustomComponent;
import com.vaadin.ui.Label;
import com.vaadin.ui.Layout;
import com.vaadin.ui.TabSheet;
import com.vaadin.ui.VerticalLayout;
/**
* 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 ClientCachingExample extends CustomComponent {
private static final String msg = "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 you 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.";
public ClientCachingExample() {
final VerticalLayout main = new VerticalLayout();
main.setMargin(true);
setCompositionRoot(main);
main.addComponent(new Label(msg));
final TabSheet ts = new TabSheet();
main.addComponent(ts);
Layout layout = new VerticalLayout();
layout.setMargin(true);
Label l = new Label("This is a normal label, quick to render.");
l.setCaption("A normal label");
layout.addComponent(l);
ts.addTab(layout, "Normal", null);
layout = new VerticalLayout();
layout.setMargin(true);
l = new Label("Slow label - until cached client side.") {
@Override
public void paintContent(PaintTarget target) throws PaintException {
try {
Thread.sleep(3000);
} catch (final Exception e) {
// IGNORED
}
super.paintContent(target);
}
};
l.setCaption("A slow label");
layout.addComponent(l);
ts.addTab(layout, "Slow", null);
}
}
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