ton*_*nix 0 java window vaadin vaadin7
我试图谷歌找到一些提示,看看Vaadin的网站,但我没有找到任何与此问题王相关的内容:
在我启动应用程序的控制台中,我多次看到此警告:
忽略对已禁用连接器com.vaadin.ui.Window的RPC调用,caption = Window的标题
我正在使用Refresher插件,以2000毫秒的间隔轮询我的服务器.以及实现推送到Vaadin UI的ICEPush插件.
我认为这与Refresher插件有某种关系,因为如果我与我为测试创建的组件(在代码下面)进行交互,则会向控制台添加警告.
这是代码:
package com.example.events;
import java.util.ArrayList;
import java.util.List;
import com.github.wolfie.refresher.Refresher;
import com.vaadin.event.FieldEvents.BlurListener;
import com.vaadin.event.FieldEvents.FocusListener;
import com.vaadin.event.FieldEvents.TextChangeEvent;
import com.vaadin.event.FieldEvents.TextChangeListener;
import com.vaadin.event.LayoutEvents.LayoutClickNotifier;
import com.vaadin.ui.AbstractTextField.TextChangeEventMode;
import com.vaadin.ui.Button;
import com.vaadin.ui.Button.ClickEvent;
import com.vaadin.ui.Button.ClickListener;
import com.vaadin.ui.Component;
import com.vaadin.ui.Label;
import com.vaadin.ui.Layout;
import com.vaadin.ui.Notification;
import com.vaadin.ui.TextArea;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;
import com.vaadin.ui.Window;
public class Noticeboard extends VerticalLayout {
/**
*
*/
private static final long serialVersionUID = -6023888496081433464L;
private static List<Note> notes = new ArrayList<Note>();
private List<Window> windows = new ArrayList<Window>();
private static int userCount;
private int userId;
private static int noteId;
private Refresher refresher = new Refresher();
private static final int UPDATE_INTERVAL = 2000;
private Note currentlyFocusedNote;
public class NoticeboardUpdater extends Thread {
@Override
public void run() {
while (true) {
try {
Thread.sleep(UPDATE_INTERVAL);
} catch (Exception e) {
e.printStackTrace();
}
getUI().getSession().getLockInstance().lock();
try {
updateNoticeboard();
} finally {
getUI().getSession().getLockInstance().unlock();
}
}
}
}
public Noticeboard() {
refresher.setRefreshInterval(UPDATE_INTERVAL);
userId = ++userCount;
setSpacing(true);
setMargin(true);
addComponent(new Label("Logged in as User " + userId));
Button addNoteButton = new Button("Add note");
addNoteButton.addClickListener(new ClickListener() {
/**
*
*/
private static final long serialVersionUID = -4927018162887570343L;
@Override
public void buttonClick(ClickEvent event) {
Note note = new Note(++noteId);
note.setCaption("Note " + note.getId());
notes.add(note);
Window window = createWindow(note);
windows.add(window);
UI.getCurrent().addWindow(window);
}
});
addComponent(addNoteButton);
addExtension(refresher);
new NoticeboardUpdater().start();
}
private Window createWindow(final Note note) {
final Window window = new Window(note.getCaption());
VerticalLayout layout = new VerticalLayout();
layout.addComponent(createContentNote(note, window));
window.setContent(layout);
window.setWidth(300, Unit.PIXELS);
window.setResizable(false);
window.setPositionX(note.getPositionX());
window.setPositionY(note.getPositionY());
window.setData(note);
window.addBlurListener(createBlurListener(window));
window.addFocusListener(createFocusListener(window));
LayoutClickNotifier mainLayout = (LayoutClickNotifier) getUI().getContent();
mainLayout.addLayoutClickListener(e -> {
if (note.isNoteFocusedWindow() || note.isNoteFocusedTextArea()) {
if (note.getLockedByUser() > -1 && note.getLockedByUser() == userId) {
unlockNote(getWindow(currentlyFocusedNote));
note.setNoteFocusedWindow(false);
note.setNoteBlurredWindow(false);
note.setNoteFocusedTextArea(false);
note.setNoteBlurredTextArea(false);
currentlyFocusedNote = null;
}
}
});
return window;
}
private TextArea createContentNote(final Note note, final Window window) {
TextArea contentNote = new TextArea();
contentNote.setSizeFull();
contentNote.setValue(note.getText());
contentNote.setImmediate(true);
contentNote.setTextChangeEventMode(TextChangeEventMode.EAGER);
contentNote.addBlurListener(createBlurListener(window));
contentNote.addFocusListener(createFocusListener(window));
contentNote.addTextChangeListener(new TextChangeListener() {
/**
*
*/
private static final long serialVersionUID = 8552875156973567499L;
@Override
public void textChange(TextChangeEvent event) {
note.setText(event.getText());
}
});
return contentNote;
}
private BlurListener createBlurListener(Window window) {
return e -> {
Component blurredComponent = e.getComponent();
if (blurredComponent == window) {
currentlyFocusedNote.setNoteBlurredWindow(true);
}
else if (blurredComponent == (((Layout) window.getContent())).iterator().next()) {
currentlyFocusedNote.setNoteBlurredTextArea(true);
}
};
}
private FocusListener createFocusListener(Window window) {
return e -> {
Component focusedComponent = e.getComponent();
Note note = (Note) window.getData();
if (currentlyFocusedNote != null && currentlyFocusedNote != note) {
unlockNote(getWindow(currentlyFocusedNote));
currentlyFocusedNote.setNoteFocusedWindow(false);
currentlyFocusedNote.setNoteBlurredWindow(false);
currentlyFocusedNote.setNoteFocusedTextArea(false);
currentlyFocusedNote.setNoteBlurredTextArea(false);
}
currentlyFocusedNote = note;
if (focusedComponent == window) {
Notification.show("Focused Note Window");
currentlyFocusedNote.setNoteFocusedWindow(true);
}
else if (focusedComponent == (((Layout) window.getContent())).iterator().next()) {
Notification.show("Focused Note TextArea");
currentlyFocusedNote.setNoteFocusedTextArea(true);
}
if (currentlyFocusedNote.isNoteFocusedWindow() && currentlyFocusedNote.isNoteBlurredTextArea() ||
currentlyFocusedNote.isNoteFocusedTextArea() && currentlyFocusedNote.isNoteBlurredWindow()) {
// Lock is already set here, skipping
return;
}
lockNote(window);
};
}
private void lockNote(Window window) {
Note note = (Note) window.getData();
note.setLockedByUser(userId);
String caption = "Locked by User " + userId;
note.setCaption(caption);
window.setCaption(caption);
}
private void unlockNote(Window window) {
Note note = (Note) window.getData();
note.setLockedByUser(-1);
note.setPositionX(window.getPositionX());
note.setPositionY(window.getPositionY());
note.setCaption("Note " + note.getId());
window.setCaption("Note " + note.getId());
}
private void updateNoticeboard() {
for (Note note : notes) {
Window window = getWindow(note);
if (window == null) {
window = createWindow(note);
windows.add(window);
UI.getCurrent().addWindow(window);
}
if (note.getLockedByUser() > -1) {
if (note.getLockedByUser() != userId) {
// If the note is locked by another user, then we disable this window.
window.setEnabled(false);
updateTextArea(window, note);
updateWindowPosition(window, note);
}
else {
// Otherwise the window is enabled.
window.setEnabled(true);
Note focusedNote = (Note) window.getData();
updateFocusedNotePosition(focusedNote, window);
}
}
else {
window.setEnabled(true);
updateTextArea(window, note);
updateWindowPosition(window, note);
}
}
}
private void updateTextArea(Window window, Note note) {
Layout layout = (Layout) window.getContent();
TextArea area = (TextArea) layout.iterator().next();
area.setValue(note.getText());
}
private Window getWindow(Note note) {
for (Window window : windows) {
if (window.getData().equals(note))
return window;
}
return null;
}
private void updateWindowPosition(Window window, Note note) {
window.setPositionX(note.getPositionX());
window.setPositionY(note.getPositionY());
window.setCaption(note.getCaption());
}
private void updateFocusedNotePosition(Note focusedNote, Window window) {
focusedNote.setPositionX(window.getPositionX());
focusedNote.setPositionY(window.getPositionY());
focusedNote.setCaption(window.getCaption());
}
}
在UI的init方法中,我只使用这个Noticeboard类:
@Override
protected void init(VaadinRequest request) {
setContent(new Noticeboard());
}
当我移动使用"添加注释"按钮创建的窗口或将焦点从窗口更改为另一个窗口时,我会遇到警告.
这样的问题可能是什么原因？
我知道,代码不是更好的代码,只是看看这个Vaadin插件如何表现.
禁用组件时,在客户端和服务器端都会处理禁用状态,这意味着,组件不仅在视觉上被禁用,而且服务器也拒绝处理对禁用组件的任何请求.
您看到的警告意味着存在针对已禁用组件的RPC请求(来自客户端的HTTP请求).由于组件已禁用,因此将忽略RPC请求.
当您有一个后台线程禁用组件,然后从客户端进行轮询时,通常会发生这种情况.