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package com.vaadin.tests.components.table;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import com.vaadin.shared.ui.ContentMode;
import com.vaadin.tests.components.TestBase;
import com.vaadin.tests.util.TestUtils;
import com.vaadin.ui.Button;
import com.vaadin.ui.CheckBox;
import com.vaadin.ui.Component;
import com.vaadin.ui.Label;
import com.vaadin.v7.data.Container;
import com.vaadin.v7.ui.DefaultFieldFactory;
import com.vaadin.v7.ui.Field;
import com.vaadin.v7.ui.Table;
public class EditableTableLeak extends TestBase {
private final Table table = new Table("ISO-3166 Country Codes and flags");
private final CheckBox useFieldFactory = new CheckBox(
"Use a caching TableFieldFactory");
private final Label sizeLabel = new Label("", ContentMode.HTML);
private long size = 0;
static class DebugUtils {
private static class ByteCountNullOutputStream extends OutputStream
implements Serializable {
private static final long serialVersionUID = 4220043426041762877L;
private long bytes;
@Override
public void write(int b) {
bytes++;
}
public long getBytes() {
return bytes;
}
}
public static long getSize(Object object) {
try (ByteCountNullOutputStream os = new ByteCountNullOutputStream()) {
ObjectOutputStream oos = new ObjectOutputStream(os);
oos.writeObject(object);
return os.getBytes();
} catch (IOException e) {
e.printStackTrace();
return 0;
}
}
}
private static class CachingFieldFactory extends DefaultFieldFactory {
private final Map<Object, Map<Object, Field<?>>> cache = new HashMap<>();
@Override
public Field<?> createField(Container container, Object itemId,
Object propertyId, Component uiContext) {
if (cache.containsKey(itemId)) {
if (cache.get(itemId) != null
&& cache.get(itemId).containsKey(propertyId)) {
return cache.get(itemId).get(propertyId);
}
}
Field<?> f = super.createField(container, itemId, propertyId,
uiContext);
if (!cache.containsKey(itemId)) {
cache.put(itemId, new HashMap<Object, Field<?>>());
}
cache.get(itemId).put(propertyId, f);
return f;
}
}
@Override
protected void setup() {
addComponent(useFieldFactory);
useFieldFactory.addValueChangeListener(event -> {
if (useFieldFactory.getValue()) {
table.setTableFieldFactory(new CachingFieldFactory());
} else {
table.setTableFieldFactory(DefaultFieldFactory.get());
}
});
addComponent(table);
table.setEditable(true);
table.setWidth("100%");
table.setHeight("170px");
table.setSelectable(true);
table.setContainerDataSource(TestUtils.getISO3166Container());
table.setColumnHeaders("Country", "Code");
table.setColumnAlignment(TestUtils.iso3166_PROPERTY_SHORT,
Table.ALIGN_CENTER);
table.setColumnExpandRatio(TestUtils.iso3166_PROPERTY_NAME, 1);
table.setColumnWidth(TestUtils.iso3166_PROPERTY_SHORT, 70);
addComponent(sizeLabel);
addComponent(new Button("Show size of the table", event -> {
table.markAsDirtyRecursive();
updateSize();
}));
addComponent(new Button("Select the second row", event -> {
table.select("AL");
updateSize();
}));
}
private void updateSize() {
System.gc();
long newSize = DebugUtils.getSize(table);
sizeLabel.setValue("Size of the table: " + newSize
+ " bytes<br/>Delta: " + (newSize - size));
size = newSize;
}
@Override
protected String getDescription() {
return "Table leaks memory while scrolling/selecting when in editable mode";
}
@Override
protected Integer getTicketNumber() {
return 6071;
}
}
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