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package com.vaadin.tests.components.grid;
import java.util.Arrays;
import java.util.concurrent.atomic.AtomicReference;
import java.util.stream.Stream;
import com.vaadin.data.provider.AbstractBackEndDataProvider;
import com.vaadin.data.provider.Query;
import com.vaadin.server.VaadinRequest;
import com.vaadin.ui.Button;
import com.vaadin.ui.Grid;
/**
* Tests that Grid refresh doesn't get stuck when filtering doesn't match row
* requests.
*
* @author Vaadin Ltd
*/
public class GridDataProviderRefresh extends SimpleGridUI {
private volatile Boolean filter = false;
private Stream<AtomicReference<String>> fetchValue(Boolean filter) {
if (filter) {
return Arrays
.asList("One", String.valueOf(System.currentTimeMillis()))
.stream().map(s -> new AtomicReference<>(s));
} else {
return Stream.empty();
}
}
@Override
protected void setup(VaadinRequest request) {
AbstractBackEndDataProvider<AtomicReference<String>, Object> dataProvider = new AbstractBackEndDataProvider<AtomicReference<String>, Object>() {
@Override
protected Stream<AtomicReference<String>> fetchFromBackEnd(
Query<AtomicReference<String>, Object> query) {
try {
Thread.sleep(250);
} catch (InterruptedException e) {
e.printStackTrace();
}
return fetchValue(filter);
}
@Override
protected int sizeInBackEnd(
Query<AtomicReference<String>, Object> query) {
return (int) fetchValue(filter).count();
}
};
Grid<AtomicReference<String>> grid = new Grid<>();
grid.setDataProvider(dataProvider);
grid.addColumn(AtomicReference::get);
addComponent(grid);
Button button = new Button("Refresh");
button.addClickListener(event1 -> {
filter = new Boolean(!filter);
dataProvider.refreshAll();
});
addComponent(button);
}
@Override
protected String getTestDescription() {
return "Grid refreshAll shouldn't get stuck when filtering doesn't match row requests "
+ "(randomly triggered when button is clicked fast enough "
+ "several times in a row, especially if using old and slow Windows)";
}
@Override
protected Integer getTicketNumber() {
return 10038;
}
}
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