com.vaadin.server
Interface ClientConnector

All Superinterfaces:

com.vaadin.shared.Connector, java.io.Serializable

All Known Subinterfaces:

Component, Component.Focusable, ComponentContainer, DragSource, DropTarget, Extension, Field<T>, HasComponents, Layout, LegacyComponent, Renderer<T>, SelectiveRenderer, SingleComponentContainer

All Known Implementing Classes:

AbsoluteLayout, AbstractClientConnector, AbstractColorPicker, AbstractComponent, AbstractComponentContainer, AbstractEmbedded, AbstractExtension, AbstractField, AbstractJavaScriptComponent, AbstractJavaScriptExtension, AbstractJavaScriptRenderer, AbstractLayout, AbstractMedia, AbstractOrderedLayout, AbstractSelect, AbstractSingleComponentContainer, AbstractSplitPanel, AbstractTextField, Accordion, Audio, BrowserFrame, BrowserWindowOpener, Button, ButtonRenderer, Calendar, CheckBox, ClickableRenderer, ColorPicker, ColorPickerArea, ColorPickerGradient, ColorPickerGrid, ColorPickerHistory, ColorPickerPopup, ColorPickerPreview, ColorPickerSelect, ComboBox, CssLayout, CustomComponent, CustomField, CustomLayout, DateField, DateRenderer, DragAndDropService, DragAndDropWrapper, Embedded, FileDownloader, Flash, Form, FormLayout, Grid, Grid.AbstractGridExtension, Grid.AbstractRenderer, GridLayout, HorizontalLayout, HorizontalSplitPanel, HtmlRenderer, Image, ImageRenderer, InlineDateField, JavaScript, Label, LegacyWindow, Link, ListSelect, LoginForm, MenuBar, NativeButton, NativeSelect, Navigator.EmptyView, NumberRenderer, OptionGroup, Panel, PasswordField, PopupDateField, PopupView, ProgressBar, ProgressBarRenderer, ProgressIndicator, Responsive, RichTextArea, RpcDataProviderExtension, Select, Slider, Table, TabSheet, TextArea, TextField, TextRenderer, Tree, TreeTable, TwinColSelect, UI, Upload, VerticalLayout, VerticalSplitPanel, Video, Window

public interface ClientConnector
extends com.vaadin.shared.Connector

Interface implemented by all connectors that are capable of communicating with the client side

Since:

7.0.0

Author:

Vaadin Ltd

Nested Class Summary

static class	ClientConnector.AttachEvent Event fired after a connector is attached to the application.
static interface	ClientConnector.AttachListener Interface for listening connector detach events.
static class	ClientConnector.ConnectorErrorEvent An error event for connector related errors.
static class	ClientConnector.DetachEvent Event fired before a connector is detached from the application.
static interface	ClientConnector.DetachListener Interface for listening connector detach events.

Method Summary

void	addAttachListener(ClientConnector.AttachListener listener)
void	addDetachListener(ClientConnector.DetachListener listener)
void	attach() Notifies the connector that it is connected to a VaadinSession (and therefore also to a UI).
void	beforeClientResponse(boolean initial) Called before the shared state and RPC invocations are sent to the client.
void	detach() Notifies the connector that it is detached from its VaadinSession.
elemental.json.JsonObject	encodeState() Called by the framework to encode the state to a JSONObject.
ErrorHandler	getErrorHandler() Gets the error handler for the connector.
java.util.Collection<Extension>	getExtensions() Get a read-only collection of all extensions attached to this connector.
ClientConnector	getParent()
ServerRpcManager<?>	getRpcManager(java.lang.String rpcInterfaceName) Returns the RPC manager instance to use when receiving calls for an RPC interface.
java.lang.Class<? extends com.vaadin.shared.communication.SharedState>	getStateType() Returns the type of the shared state for this connector
UI	getUI() Returns the UI this connector is attached to
boolean	handleConnectorRequest(VaadinRequest request, VaadinResponse response, java.lang.String path) Handle a request directed to this connector.
boolean	isAttached() Checks if the connector is attached to a VaadinSession.
boolean	isConnectorEnabled() Checks if the communicator is enabled.
void	markAsDirty() Marks that this connector's state might have changed.
void	markAsDirtyRecursive() Causes this connector and all connectors below it to be marked as dirty.
void	removeAttachListener(ClientConnector.AttachListener listener)
void	removeDetachListener(ClientConnector.DetachListener listener)
void	removeExtension(Extension extension) Remove an extension from this connector.
void	requestRepaint() Deprecated. As of 7.0, use markAsDirty() instead
void	requestRepaintAll() Deprecated. As of 7.0, use markAsDirtyRecursive() instead
java.util.List<ClientMethodInvocation>	retrievePendingRpcCalls() Returns the list of pending server to client RPC calls and clears the list.
void	setErrorHandler(ErrorHandler errorHandler) Sets the error handler for the connector.

Methods inherited from interface com.vaadin.shared.Connector

getConnectorId

Method Detail

addAttachListener

void addAttachListener(ClientConnector.AttachListener listener)

removeAttachListener

void removeAttachListener(ClientConnector.AttachListener listener)

addDetachListener

void addDetachListener(ClientConnector.DetachListener listener)

removeDetachListener

void removeDetachListener(ClientConnector.DetachListener listener)

retrievePendingRpcCalls

java.util.List<ClientMethodInvocation> retrievePendingRpcCalls()

Returns the list of pending server to client RPC calls and clears the list.

Returns:

an unmodifiable ordered list of pending server to client method calls (not null)

isConnectorEnabled

boolean isConnectorEnabled()

Checks if the communicator is enabled. An enabled communicator is allowed to receive messages from its counter-part.

Returns:

true if the connector can receive messages, false otherwise

getStateType

java.lang.Class<? extends com.vaadin.shared.communication.SharedState> getStateType()

Returns the type of the shared state for this connector

Returns:

The type of the state. Must never return null.

getParent

ClientConnector getParent()

Specified by:

getParent in interface com.vaadin.shared.Connector

requestRepaint

@Deprecated
void requestRepaint()

Deprecated. As of 7.0, use markAsDirty() instead

markAsDirty

void markAsDirty()

Marks that this connector's state might have changed. When the framework is about to send new data to the client-side, it will run beforeClientResponse(boolean) followed by encodeState() for all connectors that are marked as dirty and send any updated state info to the client.

Since:

7.0.0

requestRepaintAll

@Deprecated
void requestRepaintAll()

Deprecated. As of 7.0, use markAsDirtyRecursive() instead

markAsDirtyRecursive

void markAsDirtyRecursive()

Causes this connector and all connectors below it to be marked as dirty.

This should only be used in special cases, e.g when the state of a descendant depends on the state of an ancestor.

Since:

7.0.0

See Also:

markAsDirty()

isAttached

boolean isAttached()

Checks if the connector is attached to a VaadinSession.

Returns:

true if the connector is attached to a session, false otherwise

Since:

7.1

attach

void attach()

Notifies the connector that it is connected to a VaadinSession (and therefore also to a UI).

The caller of this method is #setParent(ClientConnector) if the parent is itself already attached to the session. If not, the parent will call the attach() for all its children when it is attached to the session. This method is always called before the connector's data is sent to the client-side for the first time.

The attachment logic is implemented in AbstractClientConnector.

detach

void detach()

Notifies the connector that it is detached from its VaadinSession.

The caller of this method is #setParent(ClientConnector) if the parent is in the session. When the parent is detached from the session it is its responsibility to call detach() for each of its children.

getExtensions

java.util.Collection<Extension> getExtensions()

Get a read-only collection of all extensions attached to this connector.

Returns:

a collection of extensions

removeExtension

void removeExtension(Extension extension)

Remove an extension from this connector.

Parameters:

extension - the extension to remove.

getUI

UI getUI()

Returns the UI this connector is attached to

Returns:

The UI this connector is attached to or null if it is not attached to any UI

beforeClientResponse

void beforeClientResponse(boolean initial)

Called before the shared state and RPC invocations are sent to the client. Gives the connector an opportunity to set computed/dynamic state values or to invoke last minute RPC methods depending on other component features.

This method must not alter the component hierarchy in any way. Calling markAsDirty() from this method will have no effect.

Parameters:

initial - true if the client-side connector will be created and initialized after this method has been invoked. false if there is already an initialized client-side connector.

Since:

7.0

encodeState

elemental.json.JsonObject encodeState()

Called by the framework to encode the state to a JSONObject. This is typically done by calling the static method LegacyCommunicationManager.encodeState(ClientConnector, SharedState) .

Returns:

a JSON object with the encoded connector state

handleConnectorRequest

boolean handleConnectorRequest(VaadinRequest request,
                               VaadinResponse response,
                               java.lang.String path)
                               throws java.io.IOException

Handle a request directed to this connector. This can be used by connectors to dynamically generate a response and it is also used internally when serving ConnectorResources.

Requests to /APP/connector/[ui id]/[connector id]/ are routed to this method with the remaining part of the requested path available in the path parameter.

NOTE that the session is not locked when this method is called. It is the responsibility of the connector to ensure that the session is locked while handling state or other session related data. For best performance the session should be unlocked before writing a large response to the client.

Parameters:

request - the request that should be handled

response - the response object to which the response should be written

path - the requested relative path

Returns:

true if the request has been handled, false if no response has been written.

Throws:

java.io.IOException - if there is a problem generating a response.

getRpcManager

ServerRpcManager<?> getRpcManager(java.lang.String rpcInterfaceName)

Returns the RPC manager instance to use when receiving calls for an RPC interface.

Parameters:

rpcInterfaceName - name of the interface for which the call was made

Returns:

ServerRpcManager or null if none found for the interface

getErrorHandler

ErrorHandler getErrorHandler()

Gets the error handler for the connector. The error handler is dispatched whenever there is an error processing the data coming from the client to this connector.

Returns:

The error handler or null if not set

setErrorHandler

void setErrorHandler(ErrorHandler errorHandler)

Sets the error handler for the connector. The error handler is dispatched whenever there is an error processing the data coming from the client for this connector.

Parameters:

errorHandler - The error handler for this connector