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package com.vaadin.data.provider;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import java.util.concurrent.atomic.AtomicReference;
import java.util.stream.Stream;
import org.junit.Test;
import com.vaadin.shared.Registration;
/**
* @author Vaadin Ltd
*
*/
public class AbstractDataProviderTest {
private static class TestDataProvider
extends AbstractDataProvider<Object, Object> {
@Override
public Stream<Object> fetch(Query<Object, Object> t) {
return null;
}
@Override
public int size(Query<Object, Object> t) {
return 0;
}
@Override
public boolean isInMemory() {
return false;
}
}
@Test
public void refreshAll_notifyListeners() {
TestDataProvider dataProvider = new TestDataProvider();
AtomicReference<DataChangeEvent<Object>> event = new AtomicReference<>();
dataProvider.addDataProviderListener(ev -> {
assertNull(event.get());
event.set(ev);
});
dataProvider.refreshAll();
assertNotNull(event.get());
assertEquals(dataProvider, event.get().getSource());
}
@Test
public void removeListener_listenerIsNotNotified() {
TestDataProvider dataProvider = new TestDataProvider();
AtomicReference<DataChangeEvent<Object>> event = new AtomicReference<>();
Registration registration = dataProvider
.addDataProviderListener(ev -> event.set(ev));
registration.remove();
dataProvider.refreshAll();
assertNull(event.get());
}
}
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