本文整理了Java中com.vaadin.ui.UI.isAttached()方法的一些代码示例，展示了UI.isAttached()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。UI.isAttached()方法的具体详情如下：
包路径：com.vaadin.ui.UI
类名称：UI
方法名：isAttached

UI.isAttached介绍

暂无

代码示例

代码示例来源：origin: OpenNMS/opennms

public static <T extends UI> T getCurrent(Class<T> clazz) {
  final T ui = (T) UI.getCurrent();
  if (ui == null || !ui.isAttached()) {
    throw new IllegalStateException("UI is either null or not attached. Ensure it is invoked from within a VaadinRequest");
  }
  return ui;
}

代码示例来源：origin: info.magnolia.ui/magnolia-ui-framework

@Override
public void messageCleared(final Message message) {
  if (ui.isAttached()) {
    ui.access(() -> eventBus.fireEvent(new MessageEvent(message, true)));
  }
}

代码示例来源：origin: info.magnolia.ui/magnolia-ui-framework

@Override
public void messageSent(final Message message) {
  if (ui.isAttached()) {
    ui.access(() -> eventBus.fireEvent(new MessageEvent(message, false)));
  }
}

代码示例来源：origin: info.magnolia.ui/magnolia-ui-framework

@Override
  public void messageRemoved(final String id) {
    if (ui.isAttached()) {
      ui.access(() -> eventBus.fireEvent(new MessageEvent(id, true)));
    }
  }
}

代码示例来源：origin: info.magnolia.ui/magnolia-ui-framework

@Before
public void setUp() {
  Context ctx = mock(Context.class);
  User usr = mock(User.class);
  when(ctx.getUser()).thenReturn(usr);
  when(usr.getName()).thenReturn("peter");
  MgnlContext.setInstance(ctx);
  this.ui = mock(UI.class);
  doReturn(true).when(ui).isAttached();
  doAnswer(invocation -> {
    final Runnable task = invocation.getArgumentAt(0, Runnable.class);
    task.run();
    return null;
  }).when(ui).access(any(Runnable.class));
}

代码示例来源：origin: com.haulmont.addon.search/search-web

.filter(UI::isConnectorEnabled)
.forEach(ui -> {
  if (ui.isAttached()) {
    ui.access(callback);
  } else {

代码示例来源：origin: OpenNMS/opennms

public static ZoneId extractUserTimeZoneIdOrNull(final UI ui) {
    // Verify if a ui is provided, still attached and has a session
    if (ui != null && ui.isAttached() && ui.getSession() != null && ui.getSession().getSession() != null) {
      // Only the wrapped session has the attribute set, the VaadinSession does not!
      return (ZoneId) ui.getSession().getSession().getAttribute(CentralizedDateTimeFormat.SESSION_PROPERTY_TIMEZONE_ID);
    }
    return null;
  }
}

代码示例来源：origin: info.magnolia.ui/magnolia-ui-framework

@Before
public void setUp() {
  this.context = mock(Context.class);
  User usr = mock(User.class);
  when(context.getUser()).thenReturn(usr);
  MgnlContext.setInstance(context);
  this.componentProvider = mock(ComponentProvider.class);
  when(componentProvider.getComponent(eq(SystemContext.class))).thenReturn(new MockContext());
  this.eventBus = new SimpleEventBus();
  this.events = new ArrayList<>();
  final UI ui = mock(UI.class);
  doReturn(true).when(ui).isAttached();
  doAnswer(invocation -> {
    final Runnable task = invocation.getArgumentAt(0, Runnable.class);
    task.run();
    return null;
  }).when(ui).access(any(Runnable.class));
  this.dispatcher = new LocalTaskDispatcher(eventBus, ui, context, componentProvider);
  eventBus.addHandler(TaskEvent.class, new CollectingTaskEventHandler(events));
}

代码示例来源：origin: info.magnolia.ui/magnolia-ui-framework

@Override
public void onTaskEvent(final TaskEvent taskEvent) {
  if (!ui.isAttached()) {
    return;