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package com.vaadin.tests.components.grid;
import java.util.Calendar;
import java.util.LinkedList;
import java.util.List;
import java.util.Random;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.logging.Level;
import com.vaadin.annotations.Push;
import com.vaadin.server.VaadinRequest;
import com.vaadin.tests.components.AbstractTestUI;
import com.vaadin.ui.Button;
import com.vaadin.ui.Grid;
import com.vaadin.ui.HorizontalLayout;
import com.vaadin.ui.VerticalLayout;
@Push
public class GridFastAsyncUpdate extends AbstractTestUI {
private int counter;
private List<Item> items = new LinkedList<>();
private Grid<Item> grid;
private long loggingStart;
private volatile boolean scrollLock = false;
private final Runnable addRowsTask = () -> {
System.out.println("Logging...");
try {
Random random = new Random();
while (!Thread.currentThread().isInterrupted()) {
Thread.sleep(random.nextInt(100));
GridFastAsyncUpdate.this.access(() -> {
++counter;
Item item = new Item(counter,
(Calendar.getInstance().getTimeInMillis()
- loggingStart),
Level.INFO.toString(), "Message");
items.add(item);
grid.setItems(items);
if (grid != null && !scrollLock) {
grid.scrollToEnd();
}
});
}
} catch (InterruptedException e) {
System.out.println("logging thread interrupted");
}
};
@Override
protected void setup(VaadinRequest request) {
final VerticalLayout layout = new VerticalLayout();
layout.setSizeFull();
layout.setMargin(true);
addComponent(layout);
HorizontalLayout buttons = new HorizontalLayout();
layout.addComponent(buttons);
final ExecutorService logExecutor = Executors.newSingleThreadExecutor();
final Button logButton = new Button("Start logging");
logButton.addClickListener(clickEvent -> {
if ("Start logging".equals(logButton.getCaption())) {
loggingStart = Calendar.getInstance().getTimeInMillis();
logExecutor.submit(addRowsTask);
logButton.setCaption("Stop logging");
} else {
System.out.println("Stop logging...");
try {
logExecutor.shutdownNow();
} catch (Exception e) {
e.printStackTrace();
}
logButton.setCaption("Start logging");
}
});
buttons.addComponent(logButton);
final Button scrollButton = new Button("Stop scrolling");
scrollButton.addClickListener(clickEvent -> {
if (!scrollLock) {
System.out.println("Stop scrolling");
scrollButton.setCaption("Start scrolling");
scrollLock = true;
} else {
System.out.println("Start scrolling");
scrollButton.setCaption("Stop scrolling");
scrollLock = false;
}
});
buttons.addComponent(scrollButton);
grid = new Grid<>();
grid.addColumn(Item::getSequenceNumber).setCaption("");
grid.addColumn(Item::getMillis).setCaption("");
grid.addColumn(Item::getLevel).setCaption("");
grid.addColumn(Item::getMessage).setCaption("");
grid.setWidth("100%");
grid.setSelectionMode(Grid.SelectionMode.SINGLE);
grid.addSelectionListener(selectionEvent -> {
if (!selectionEvent.getAllSelectedItems().isEmpty()) {
disableScroll();
}
});
layout.addComponent(grid);
layout.setExpandRatio(grid, 1.0f);
}
protected void disableScroll() {
scrollLock = true;
}
protected class Item {
Integer sequenceNumber;
Long millis;
String level, message;
public Item(Integer sequanceNumber, Long millis, String level,
String message) {
this.sequenceNumber = sequanceNumber;
this.millis = millis;
this.level = level;
this.message = message;
}
public Integer getSequenceNumber() {
return sequenceNumber;
}
public void setSequenceNumber(Integer sequenceNumber) {
this.sequenceNumber = sequenceNumber;
}
public Long getMillis() {
return millis;
}
public void setMillis(Long millis) {
this.millis = millis;
}
public String getLevel() {
return level;
}
public void setLevel(String level) {
this.level = level;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
}
}
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