com.vaadin.client.

java.lang.Object
- com.vaadin.client.ApplicationConnection

All Implemented Interfaces:

com.google.gwt.event.shared.HasHandlers
```
public class ApplicationConnection
extends Object
implements com.google.gwt.event.shared.HasHandlers
```
This is the client side communication "engine", managing client-server communication with its server side counterpart com.vaadin.server.VaadinService. Client-side connectors receive updates from the corresponding server-side connector (typically component) as state updates or RPC calls. The connector has the possibility to communicate back with its server side counter part through RPC calls. TODO document better Entry point classes (widgetsets) define onModuleLoad().

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static class`	`ApplicationConnection.ApplicationConnectionEvent`
`static class`	`ApplicationConnection.ApplicationState`
`static class`	`ApplicationConnection.ApplicationStoppedEvent`	Event triggered when a application is stopped by calling {@link ApplicationConnection#setApplicationRunning(false)}.
`static interface`	`ApplicationConnection.ApplicationStoppedHandler`	A listener for listening to application stopped events.
`static interface`	`ApplicationConnection.CommunicationErrorHandler`	Allows custom handling of communication errors.
`static interface`	`ApplicationConnection.CommunicationHandler`	The communication handler methods are called at certain points during communication with the server.
`static class`	`ApplicationConnection.MultiStepDuration`
`static class`	`ApplicationConnection.RequestStartingEvent`
`static class`	`ApplicationConnection.ResponseHandlingEndedEvent`
`static class`	`ApplicationConnection.ResponseHandlingStartedEvent`

Field Summary

Fields
Modifier and Type	Field	Description
`protected ConnectionStateHandler`	`connectionStateHandler`
`protected boolean`	`cssLoaded`
`static String`	`DISABLED_CLASSNAME`	Deprecated.
`static String`	`ERROR_CLASSNAME_EXT`	Deprecated.
`protected MessageHandler`	`messageHandler`
`protected MessageSender`	`messageSender`
`static String`	`MODIFIED_CLASSNAME`	Deprecated.
`static String`	`REQUIRED_CLASSNAME`	Deprecated.
`static String`	`REQUIRED_CLASSNAME_EXT`	Deprecated.
`protected ServerRpcQueue`	`serverRpcQueue`
`static String`	`UIDL_REFRESH_TOKEN`	A string that, if found in a non-JSON response to a UIDL request, will cause the browser to refresh the page.

Constructor Summary

Constructors
Constructor Description

ApplicationConnection()

Method Summary

All Methods
Modifier and Type	Method	Description
`static String`	`addGetParameters(String uri, String extraParams)`	Deprecated. Use `SharedUtil.addGetParameters(String,String)` instead
`<H extends com.google.gwt.event.shared.EventHandler> com.google.gwt.event.shared.HandlerRegistration`	`addHandler(com.google.gwt.event.shared.GwtEvent.Type<H> type, H handler)`
`void`	`analyzeLayouts()`	Deprecated. as of 7.1.
`void`	`captionSizeUpdated(com.google.gwt.user.client.ui.Widget widget)`	Deprecated. As of 7.0.2, has not had any effect for a long time
`void`	`executeWhenCSSLoaded(com.google.gwt.user.client.Command c)`
`void`	`fireEvent(com.google.gwt.event.shared.GwtEvent<?> event)`
`void`	`flushActiveConnector()`	Calls `ComponentConnector.flush()` on the active connector.
`void`	`forceLayout()`	This will cause re-layouting of all components.
`ApplicationConnection.ApplicationState`	`getApplicationState()`	Returns the state of this application.
`ApplicationConfiguration`	`getConfiguration()`	Gets the `ApplicationConfiguration` for the current application.
`ConnectionStateHandler`	`getConnectionStateHandler()`	Gets the communication error handler for this application.
`ServerConnector`	`getConnector(String connectorId, int connectorType)`	Get either an existing ComponentConnector or create a new ComponentConnector with the given type and id.
`VContextMenu`	`getContextMenu()`	Singleton method to get instance of app's context menu.
`DependencyLoader`	`getDependencyLoader()`	Gets the instance which handles loading of dependencies.
`Heartbeat`	`getHeartbeat()`	Returns the hearbeat instance.
`Icon`	`getIcon(String uri)`	Gets an `Icon` instance corresponding to a URI.
`int`	`getLastSeenServerSyncId()`
`VLoadingIndicator`	`getLoadingIndicator()`	Returns the loading indicator used by this ApplicationConnection.
`MessageHandler`	`getMessageHandler()`	Gets the (server to client) message handler for this application.
`MessageSender`	`getMessageSender()`	Gets the (client to server) message sender for this application.
`ComponentConnector`	`getPaintable(UIDL uidl)`	Deprecated.
`String`	`getResource(String name)`	Gets a resource that has been pre-loaded via UIDL, such as custom layouts.
`RpcManager`	`getRpcManager()`	Gets the server rpc manager for this application.
`ServerRpcQueue`	`getServerRpcQueue()`	Gets the server RPC queue for this application.
`String`	`getThemeUri()`	Gets the URI for the current theme.
`UIConnector`	`getUIConnector()`	Gets the main view.
`VTooltip`	`getVTooltip()`	Get VTooltip instance related to application connection.
`WidgetSet`	`getWidgetSet()`
`void`	`handleCommunicationError(String details, int statusCode)`
`boolean`	`handleComponentRelativeSize(com.google.gwt.user.client.ui.Widget widget)`	Deprecated. As of 7.0, serves no purpose
`boolean`	`hasEventListeners(com.google.gwt.user.client.ui.Widget widget, String eventIdentifier)`	Deprecated. As of 7.0.
`boolean`	`hasEventListeners(ComponentConnector connector, String eventIdentifier)`	Deprecated. As of 7.0.
`void`	`init(WidgetSet widgetSet, ApplicationConfiguration cnf)`
`boolean`	`isApplicationRunning()`	Checks if the application is in the `ApplicationConnection.ApplicationState.RUNNING` state.
`protected boolean`	`isCSSLoaded()`	Checks whether or not the CSS is loaded.
`boolean`	`isLoadingIndicatorVisible()`	Deprecated. As of 7.1.
`void`	`runDescendentsLayout(com.google.gwt.user.client.ui.HasWidgets container)`	Deprecated. As of 7.0, serves no purpose
`protected void`	`scheduleHeartbeat()`	Deprecated. as of 7.2, use `Heartbeat.schedule()` instead
`protected void`	`sendHeartbeat()`	Deprecated. as of 7.2, use `Heartbeat.send()` instead
`void`	`sendPendingVariableChanges()`	Deprecated. as of 7.6, use `ServerRpcQueue.flush()`
`void`	`setApplicationRunning(boolean applicationRunning)`
`void`	`setCommunicationErrorDelegate(ApplicationConnection.CommunicationErrorHandler delegate)`	Sets the delegate that is called whenever a communication error occurrs.
`void`	`setResource(String name, String resource)`	Sets a resource that has been pre-loaded via UIDL, such as custom layouts.
`void`	`showAuthenticationError(String details)`	Shows the authentication error notification.
`void`	`showCommunicationError(String details, int statusCode)`	Shows the communication error notification.
`protected void`	`showError(String details, ApplicationConfiguration.ErrorMessage message)`	Shows an error notification.
`void`	`showSessionExpiredError(String details)`	Shows the session expiration notification.
`void`	`start()`	Starts this application.
`String`	`translateVaadinUri(String uidlUri)`	Translates custom protocols in UIDL URI's to be recognizable by browser.
`void`	`unregisterPaintable(ServerConnector p)`	Deprecated. As of 7.0.
`boolean`	`updateComponent(com.google.gwt.user.client.ui.Widget component, UIDL uidl, boolean manageCaption)`	Deprecated. As of 7.0, no longer serves any purpose
`void`	`updateVariable(String paintableId, String variableName, boolean newValue, boolean immediate)`	Sends a new value for the given paintables given variable to the server.
`void`	`updateVariable(String paintableId, String variableName, double newValue, boolean immediate)`	Sends a new value for the given paintables given variable to the server.
`void`	`updateVariable(String paintableId, String variableName, float newValue, boolean immediate)`	Sends a new value for the given paintables given variable to the server.
`void`	`updateVariable(String paintableId, String variableName, int newValue, boolean immediate)`	Sends a new value for the given paintables given variable to the server.
`void`	`updateVariable(String paintableId, String variableName, long newValue, boolean immediate)`	Sends a new value for the given paintables given variable to the server.
`void`	`updateVariable(String paintableId, String variableName, ServerConnector newValue, boolean immediate)`	Sends a new value for the given paintables given variable to the server.
`void`	`updateVariable(String paintableId, String variableName, Object[] values, boolean immediate)`	Sends a new value for the given paintables given variable to the server.
`void`	`updateVariable(String paintableId, String variableName, String[] values, boolean immediate)`	Sends a new value for the given paintables given variable to the server.
`void`	`updateVariable(String paintableId, String variableName, String newValue, boolean immediate)`	Sends a new value for the given paintables given variable to the server.
`void`	`updateVariable(String paintableId, String variableName, Map<String,Object> map, boolean immediate)`	Sends a new value for the given paintables given variable to the server.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - MODIFIED_CLASSNAME
```
@Deprecated
public static final String MODIFIED_CLASSNAME
```
    Deprecated.
    
    See Also:
    
    Constant Field Values
  - DISABLED_CLASSNAME
```
@Deprecated
public static final String DISABLED_CLASSNAME
```
    Deprecated.
    
    See Also:
    
    Constant Field Values
  - REQUIRED_CLASSNAME
```
@Deprecated
public static final String REQUIRED_CLASSNAME
```
    Deprecated.
    
    See Also:
    
    Constant Field Values
  - REQUIRED_CLASSNAME_EXT
```
@Deprecated
public static final String REQUIRED_CLASSNAME_EXT
```
    Deprecated.
    
    See Also:
    
    Constant Field Values
  - ERROR_CLASSNAME_EXT
```
@Deprecated
public static final String ERROR_CLASSNAME_EXT
```
    Deprecated.
    
    See Also:
    
    Constant Field Values
  - UIDL_REFRESH_TOKEN
```
public static final String UIDL_REFRESH_TOKEN
```
    A string that, if found in a non-JSON response to a UIDL request, will cause the browser to refresh the page. If followed by a colon, optional whitespace, and a URI, causes the browser to synchronously load the URI.
    This allows, for instance, a servlet filter to redirect the application to a custom login page when the session expires. For example:
```
 if (sessionExpired) {
     response.setHeader("Content-Type", "text/html");
     response.getWriter().write(myLoginPageHtml + "");
 }
 
```
    See Also:
    
    Constant Field Values
  - cssLoaded
```
protected boolean cssLoaded
```
  - serverRpcQueue
```
protected ServerRpcQueue serverRpcQueue
```
  - connectionStateHandler
```
protected ConnectionStateHandler connectionStateHandler
```
  - messageHandler
```
protected MessageHandler messageHandler
```
  - messageSender
```
protected MessageSender messageSender
```
- Constructor Detail
  - ApplicationConnection
```
public ApplicationConnection()
```
- Method Detail
  - init
```
public void init(WidgetSet widgetSet,
                 ApplicationConfiguration cnf)
```
  - start
```
public void start()
```
    Starts this application. Don't call this method directly - it's called by ApplicationConfiguration#startNextApplication(), which should be called once this application has started (first response received) or failed to start. This ensures that the applications are started in order, to avoid session-id problems.
  - analyzeLayouts
```
@Deprecated
public void analyzeLayouts()
```
    Deprecated.
    as of 7.1. Replaced by UIConnector.analyzeLayouts()
    
    Requests an analyze of layouts, to find inconsistencies. Exclusively used for debugging during development.
  - executeWhenCSSLoaded
```
public void executeWhenCSSLoaded(com.google.gwt.user.client.Command c)
```
  - isCSSLoaded
```
protected boolean isCSSLoaded()
```
    Checks whether or not the CSS is loaded. By default checks the size of the loading indicator element.
    
    Returns:
  - showCommunicationError
```
public void showCommunicationError(String details,
                                   int statusCode)
```
    Shows the communication error notification.
    
    Parameters:
    
    details - Optional details.
    
    statusCode - The status code returned for the request
  - showAuthenticationError
```
public void showAuthenticationError(String details)
```
    Shows the authentication error notification.
    
    Parameters:
    
    details - Optional details.
  - showSessionExpiredError
```
public void showSessionExpiredError(String details)
```
    Shows the session expiration notification.
    
    Parameters:
    
    details - Optional details.
  - showError
```
protected void showError(String details,
                         ApplicationConfiguration.ErrorMessage message)
```
    Shows an error notification.
    
    Parameters:
    
    details - Optional details.
    
    message - An ErrorMessage describing the error.
  - getLoadingIndicator
```
public VLoadingIndicator getLoadingIndicator()
```
    Returns the loading indicator used by this ApplicationConnection.
    
    Returns:
    
    The loading indicator for this ApplicationConnection
  - isLoadingIndicatorVisible
```
@Deprecated
public boolean isLoadingIndicatorVisible()
```
    Deprecated.
    As of 7.1. Use getLoadingIndicator() and VLoadingIndicator.isVisible().isVisible() instead.
    
    Determines whether or not the loading indicator is showing.
    
    Returns:
    
    true if the loading indicator is visible
  - sendPendingVariableChanges
```
@Deprecated
public void sendPendingVariableChanges()
```
    Deprecated.
    as of 7.6, use ServerRpcQueue.flush()
  - updateVariable
```
public void updateVariable(String paintableId,
                           String variableName,
                           ServerConnector newValue,
                           boolean immediate)
```
    Sends a new value for the given paintables given variable to the server.
    The update is actually queued to be sent at a suitable time. If immediate is true, the update is sent as soon as possible. If immediate is false, the update will be sent along with the next immediate update.
    
    Parameters:
    
    paintableId - the id of the paintable that owns the variable
    
    variableName - the name of the variable
    
    newValue - the new value to be sent
    
    immediate - true if the update is to be sent as soon as possible
  - updateVariable
```
public void updateVariable(String paintableId,
                           String variableName,
                           String newValue,
                           boolean immediate)
```
    Sends a new value for the given paintables given variable to the server.
    The update is actually queued to be sent at a suitable time. If immediate is true, the update is sent as soon as possible. If immediate is false, the update will be sent along with the next immediate update.
    
    Parameters:
    
    paintableId - the id of the paintable that owns the variable
    
    variableName - the name of the variable
    
    newValue - the new value to be sent
    
    immediate - true if the update is to be sent as soon as possible
  - updateVariable
```
public void updateVariable(String paintableId,
                           String variableName,
                           int newValue,
                           boolean immediate)
```
    Sends a new value for the given paintables given variable to the server.
    The update is actually queued to be sent at a suitable time. If immediate is true, the update is sent as soon as possible. If immediate is false, the update will be sent along with the next immediate update.
    
    Parameters:
    
    paintableId - the id of the paintable that owns the variable
    
    variableName - the name of the variable
    
    newValue - the new value to be sent
    
    immediate - true if the update is to be sent as soon as possible
  - updateVariable
```
public void updateVariable(String paintableId,
                           String variableName,
                           long newValue,
                           boolean immediate)
```
    Sends a new value for the given paintables given variable to the server.
    The update is actually queued to be sent at a suitable time. If immediate is true, the update is sent as soon as possible. If immediate is false, the update will be sent along with the next immediate update.
    
    Parameters:
    
    paintableId - the id of the paintable that owns the variable
    
    variableName - the name of the variable
    
    newValue - the new value to be sent
    
    immediate - true if the update is to be sent as soon as possible
  - updateVariable
```
public void updateVariable(String paintableId,
                           String variableName,
                           float newValue,
                           boolean immediate)
```
    Sends a new value for the given paintables given variable to the server.
    The update is actually queued to be sent at a suitable time. If immediate is true, the update is sent as soon as possible. If immediate is false, the update will be sent along with the next immediate update.
    
    Parameters:
    
    paintableId - the id of the paintable that owns the variable
    
    variableName - the name of the variable
    
    newValue - the new value to be sent
    
    immediate - true if the update is to be sent as soon as possible
  - updateVariable
```
public void updateVariable(String paintableId,
                           String variableName,
                           double newValue,
                           boolean immediate)
```
    Sends a new value for the given paintables given variable to the server.
    The update is actually queued to be sent at a suitable time. If immediate is true, the update is sent as soon as possible. If immediate is false, the update will be sent along with the next immediate update.
    
    Parameters:
    
    paintableId - the id of the paintable that owns the variable
    
    variableName - the name of the variable
    
    newValue - the new value to be sent
    
    immediate - true if the update is to be sent as soon as possible
  - updateVariable
```
public void updateVariable(String paintableId,
                           String variableName,
                           boolean newValue,
                           boolean immediate)
```
    Sends a new value for the given paintables given variable to the server.
    The update is actually queued to be sent at a suitable time. If immediate is true, the update is sent as soon as possible. If immediate is false, the update will be sent along with the next immediate update.
    
    Parameters:
    
    paintableId - the id of the paintable that owns the variable
    
    variableName - the name of the variable
    
    newValue - the new value to be sent
    
    immediate - true if the update is to be sent as soon as possible
  - updateVariable
```
public void updateVariable(String paintableId,
                           String variableName,
                           Map<String,Object> map,
                           boolean immediate)
```
    Sends a new value for the given paintables given variable to the server.
    The update is actually queued to be sent at a suitable time. If immediate is true, the update is sent as soon as possible. If immediate is false, the update will be sent along with the next immediate update.
    
    Parameters:
    
    paintableId - the id of the paintable that owns the variable
    
    variableName - the name of the variable
    
    map - the new values to be sent
    
    immediate - true if the update is to be sent as soon as possible
  - updateVariable
```
public void updateVariable(String paintableId,
                           String variableName,
                           String[] values,
                           boolean immediate)
```
    Sends a new value for the given paintables given variable to the server.
    The update is actually queued to be sent at a suitable time. If immediate is true, the update is sent as soon as possible. If immediate is false, the update will be sent along with the next immediate update.
    A null array is sent as an empty array.
    
    Parameters:
    
    paintableId - the id of the paintable that owns the variable
    
    variableName - the name of the variable
    
    values - the new value to be sent
    
    immediate - true if the update is to be sent as soon as possible
  - updateVariable
```
public void updateVariable(String paintableId,
                           String variableName,
                           Object[] values,
                           boolean immediate)
```
    Sends a new value for the given paintables given variable to the server.
    The update is actually queued to be sent at a suitable time. If immediate is true, the update is sent as soon as possible. If immediate is false, the update will be sent along with the next immediate update.
    A null array is sent as an empty array.
    
    Parameters:
    
    paintableId - the id of the paintable that owns the variable
    
    variableName - the name of the variable
    
    values - the new value to be sent
    
    immediate - true if the update is to be sent as soon as possible
  - runDescendentsLayout
```
@Deprecated
public void runDescendentsLayout(com.google.gwt.user.client.ui.HasWidgets container)
```
    Deprecated.
    As of 7.0, serves no purpose
    
    Does absolutely nothing. Replaced by LayoutManager.
    
    Parameters:
    
    container -
  - forceLayout
```
public void forceLayout()
```
    This will cause re-layouting of all components. Mainly used for development. Published to JavaScript.
  - handleComponentRelativeSize
```
@Deprecated
public boolean handleComponentRelativeSize(com.google.gwt.user.client.ui.Widget widget)
```
    Deprecated.
    As of 7.0, serves no purpose
    
    Returns false.
    
    Parameters:
    
    paintable -
    
    Returns:
    
    false, always
  - getPaintable
```
@Deprecated
public ComponentConnector getPaintable(UIDL uidl)
```
    Deprecated.
  - getConnector
```
public ServerConnector getConnector(String connectorId,
                                    int connectorType)
```
    Get either an existing ComponentConnector or create a new ComponentConnector with the given type and id. If a ComponentConnector with the given id already exists, returns it. Otherwise creates and registers a new ComponentConnector of the given type.
    
    Parameters:
    
    connectorId - Id of the paintable
    
    connectorType - Type of the connector, as passed from the server side
    
    Returns:
    
    Either an existing ComponentConnector or a new ComponentConnector of the given type
  - getResource
```
public String getResource(String name)
```
    Gets a resource that has been pre-loaded via UIDL, such as custom layouts.
    
    Parameters:
    
    name - identifier of the resource to get
    
    Returns:
    
    the resource
  - setResource
```
public void setResource(String name,
                        String resource)
```
    Sets a resource that has been pre-loaded via UIDL, such as custom layouts.
    
    Parameters:
    
    name - identifier of the resource to Set
    
    resource - the resource
    
    Since:
    
    7.6
  - getContextMenu
```
public VContextMenu getContextMenu()
```
    Singleton method to get instance of app's context menu.
    
    Returns:
    
    VContextMenu object
  - getIcon
```
public Icon getIcon(String uri)
```
    Gets an Icon instance corresponding to a URI.
    
    Parameters:
    
    uri -
    
    Returns:
    
    Icon object
    
    Since:
    
    7.2
  - translateVaadinUri
```
public String translateVaadinUri(String uidlUri)
```
    Translates custom protocols in UIDL URI's to be recognizable by browser. All uri's from UIDL should be routed via this method before giving them to browser due URI's in UIDL may contain custom protocols like theme://.
    
    Parameters:
    
    uidlUri - Vaadin URI from uidl
    
    Returns:
    
    translated URI ready for browser
  - getThemeUri
```
public String getThemeUri()
```
    Gets the URI for the current theme. Can be used to reference theme resources.
    
    Returns:
    
    URI to the current theme
  - captionSizeUpdated
```
@Deprecated
public void captionSizeUpdated(com.google.gwt.user.client.ui.Widget widget)
```
    Deprecated.
    As of 7.0.2, has not had any effect for a long time
    
    Use to notify that the given component's caption has changed; layouts may have to be recalculated.
    
    Parameters:
    
    widget - The Widget whose caption has changed
  - getUIConnector
```
public UIConnector getUIConnector()
```
    Gets the main view.
    
    Returns:
    
    the main view
  - getConfiguration
```
public ApplicationConfiguration getConfiguration()
```
    Gets the ApplicationConfiguration for the current application.
    
    Returns:
    
    the configuration for this application
    
    See Also:
    
    ApplicationConfiguration
  - hasEventListeners
```
@Deprecated
public boolean hasEventListeners(ComponentConnector connector,
                                 String eventIdentifier)
```
    Deprecated.
    As of 7.0. Use AbstractConnector.hasEventListener(String) instead
    
    Checks if there is a registered server side listener for the event. The list of events which has server side listeners is updated automatically before the component is updated so the value is correct if called from updatedFromUIDL.
    
    Parameters:
    
    connector - The connector to register event listeners for
    
    eventIdentifier - The identifier for the event
    
    Returns:
    
    true if at least one listener has been registered on server side for the event identified by eventIdentifier.
  - addGetParameters
```
@Deprecated
public static String addGetParameters(String uri,
                                      String extraParams)
```
    Deprecated.
    Use SharedUtil.addGetParameters(String,String) instead
    
    Adds the get parameters to the uri and returns the new uri that contains the parameters.
    
    Parameters:
    
    uri - The uri to which the parameters should be added.
    
    extraParams - One or more parameters in the format "a=b" or "c=d&e=f". An empty string is allowed but will not modify the url.
    
    Returns:
    
    The modified URI with the get parameters in extraParams added.
  - unregisterPaintable
```
@Deprecated
public void unregisterPaintable(ServerConnector p)
```
    Deprecated.
    As of 7.0. No longer serves any purpose.
  - getVTooltip
```
public VTooltip getVTooltip()
```
    Get VTooltip instance related to application connection.
    
    Returns:
    
    VTooltip instance
  - updateComponent
```
@Deprecated
public boolean updateComponent(com.google.gwt.user.client.ui.Widget component,
                               UIDL uidl,
                               boolean manageCaption)
```
    Deprecated.
    As of 7.0, no longer serves any purpose
    
    Method provided for backwards compatibility. Duties previously done by this method is now handled by the state change event handler in AbstractComponentConnector. The only function this method has is to return true if the UIDL is a "cached" update.
    
    Parameters:
    
    component -
    
    uidl -
    
    manageCaption -
    
    Returns:
  - hasEventListeners
```
@Deprecated
public boolean hasEventListeners(com.google.gwt.user.client.ui.Widget widget,
                                 String eventIdentifier)
```
    Deprecated.
    As of 7.0. Use AbstractConnector.hasEventListener(String) instead
  - scheduleHeartbeat
```
@Deprecated
protected void scheduleHeartbeat()
```
    Deprecated.
    as of 7.2, use Heartbeat.schedule() instead
    
    Schedules a heartbeat request to occur after the configured heartbeat interval elapses if the interval is a positive number. Otherwise, does nothing.
  - sendHeartbeat
```
@Deprecated
protected void sendHeartbeat()
```
    Deprecated.
    as of 7.2, use Heartbeat.send() instead
    
    Sends a heartbeat request to the server.
    Heartbeat requests are used to inform the server that the client-side is still alive. If the client page is closed or the connection lost, the server will eventually close the inactive UI.
  - handleCommunicationError
```
public void handleCommunicationError(String details,
                                     int statusCode)
```
  - setCommunicationErrorDelegate
```
public void setCommunicationErrorDelegate(ApplicationConnection.CommunicationErrorHandler delegate)
```
    Sets the delegate that is called whenever a communication error occurrs.
    
    Parameters:
    
    delegate - the delegate.
  - setApplicationRunning
```
public void setApplicationRunning(boolean applicationRunning)
```
  - isApplicationRunning
```
public boolean isApplicationRunning()
```
    Checks if the application is in the ApplicationConnection.ApplicationState.RUNNING state.
    
    Returns:
    
    true if the application is in the running state, false otherwise
    
    Since:
    
    7.6
  - addHandler
```
public <H extends com.google.gwt.event.shared.EventHandler> com.google.gwt.event.shared.HandlerRegistration addHandler(com.google.gwt.event.shared.GwtEvent.Type<H> type,
                                                                                                                       H handler)
```
  - fireEvent
```
public void fireEvent(com.google.gwt.event.shared.GwtEvent<?> event)
```
    Specified by:
    
    fireEvent in interface com.google.gwt.event.shared.HasHandlers
  - flushActiveConnector
```
public void flushActiveConnector()
```
    Calls ComponentConnector.flush() on the active connector. Does nothing if there is no active (focused) connector.
  - getHeartbeat
```
public Heartbeat getHeartbeat()
```
    Returns the hearbeat instance.
  - getApplicationState
```
public ApplicationConnection.ApplicationState getApplicationState()
```
    Returns the state of this application. An application state goes from "initializing" to "running" to "stopped". There is no way for an application to go back to a previous state, i.e. a stopped application can never be re-started
    
    Returns:
    
    the current state of this application
    
    Since:
    
    7.6
  - getServerRpcQueue
```
public ServerRpcQueue getServerRpcQueue()
```
    Gets the server RPC queue for this application.
    
    Returns:
    
    the server RPC queue
    
    Since:
    
    7.6
  - getConnectionStateHandler
```
public ConnectionStateHandler getConnectionStateHandler()
```
    Gets the communication error handler for this application.
    
    Returns:
    
    the server RPC queue
    
    Since:
    
    7.6
  - getMessageHandler
```
public MessageHandler getMessageHandler()
```
    Gets the (server to client) message handler for this application.
    
    Returns:
    
    the message handler
    
    Since:
    
    7.6
  - getRpcManager
```
public RpcManager getRpcManager()
```
    Gets the server rpc manager for this application.
    
    Returns:
    
    the server rpc manager
    
    Since:
    
    7.6
  - getMessageSender
```
public MessageSender getMessageSender()
```
    Gets the (client to server) message sender for this application.
    
    Returns:
    
    the message sender
    
    Since:
    
    7.6
  - getWidgetSet
```
public WidgetSet getWidgetSet()
```
    Returns:
    
    the widget set
    
    Since:
    
    7.6
  - getLastSeenServerSyncId
```
public int getLastSeenServerSyncId()
```
  - getDependencyLoader
```
public DependencyLoader getDependencyLoader()
```
    Gets the instance which handles loading of dependencies.
    
    Returns:
    
    the dependency loader for this connection

com.vaadin.client.

Class ApplicationConnection

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

MODIFIED_CLASSNAME

DISABLED_CLASSNAME

REQUIRED_CLASSNAME

REQUIRED_CLASSNAME_EXT

ERROR_CLASSNAME_EXT

UIDL_REFRESH_TOKEN

cssLoaded

serverRpcQueue

connectionStateHandler

messageHandler

messageSender

Constructor Detail

ApplicationConnection

Method Detail

init

start

analyzeLayouts

executeWhenCSSLoaded

isCSSLoaded

showCommunicationError

showAuthenticationError

showSessionExpiredError

showError

getLoadingIndicator

isLoadingIndicatorVisible

sendPendingVariableChanges

updateVariable

updateVariable

updateVariable

updateVariable

updateVariable

updateVariable

updateVariable

updateVariable

updateVariable

updateVariable

runDescendentsLayout

forceLayout

handleComponentRelativeSize

getPaintable

getConnector

getResource

setResource

getContextMenu

getIcon

translateVaadinUri

getThemeUri

captionSizeUpdated

getUIConnector

getConfiguration

hasEventListeners

addGetParameters

unregisterPaintable

getVTooltip

updateComponent

hasEventListeners

scheduleHeartbeat

sendHeartbeat

handleCommunicationError

setCommunicationErrorDelegate

setApplicationRunning

isApplicationRunning

addHandler

fireEvent

flushActiveConnector

getHeartbeat

getApplicationState

getServerRpcQueue

getConnectionStateHandler

getMessageHandler

getRpcManager

getMessageSender