org.springframework.web.socket.client.jetty

Class JettyWebSocketClient

java.lang.Object

org.springframework.web.socket.client.AbstractWebSocketClient

org.springframework.web.socket.client.jetty.JettyWebSocketClient

All Implemented Interfaces:

Lifecycle, WebSocketClient

public class JettyWebSocketClient
extends AbstractWebSocketClient
implements Lifecycle

Initiates WebSocket requests to a WebSocket server programmatically through the Jetty WebSocket API.

As of 4.1 this class implements Lifecycle rather than SmartLifecycle. Use WebSocketConnectionManager instead to auto-start a WebSocket connection.

Since:

4.0

Author:

Rossen Stoyanchev

Field Summary

Fields inherited from class org.springframework.web.socket.client.AbstractWebSocketClient

logger

Constructor Summary

Constructors

Constructor and Description
JettyWebSocketClient() Default constructor that creates an instance of WebSocketClient.
JettyWebSocketClient(org.eclipse.jetty.websocket.client.WebSocketClient client) Constructor that accepts an existing WebSocketClient instance.

Method Summary

Modifier and Type	Method and Description
ListenableFuture<WebSocketSession>	doHandshake(WebSocketHandler webSocketHandler, String uriTemplate, Object... uriVars)
ListenableFuture<WebSocketSession>	doHandshakeInternal(WebSocketHandler wsHandler, HttpHeaders headers, URI uri, List<String> protocols, List<WebSocketExtension> extensions, Map<String,Object> attributes) Perform the actual handshake to establish a connection to the server.
AsyncListenableTaskExecutor	getTaskExecutor() Return the configured TaskExecutor.
protected Principal	getUser() Return the user to make available through WebSocketSession.getPrincipal().
boolean	isRunning() Check whether this component is currently running.
void	setTaskExecutor(AsyncListenableTaskExecutor taskExecutor) Set an AsyncListenableTaskExecutor to use when opening connections.
void	start() Start this component.
void	stop() Stop this component, typically in a synchronous fashion, such that the component is fully stopped upon return of this method.

Methods inherited from class org.springframework.web.socket.client.AbstractWebSocketClient

assertUri, doHandshake

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JettyWebSocketClient

public JettyWebSocketClient()

Default constructor that creates an instance of WebSocketClient.

JettyWebSocketClient

public JettyWebSocketClient(org.eclipse.jetty.websocket.client.WebSocketClient client)

Constructor that accepts an existing WebSocketClient instance.

Method Detail

setTaskExecutor

public void setTaskExecutor(@Nullable
                            AsyncListenableTaskExecutor taskExecutor)

Set an AsyncListenableTaskExecutor to use when opening connections. If this property is set to null, calls to any of the doHandshake methods will block until the connection is established.

By default an instance of SimpleAsyncTaskExecutor is used.

getTaskExecutor

@Nullable
public AsyncListenableTaskExecutor getTaskExecutor()

Return the configured TaskExecutor.

start

public void start()

Description copied from interface: Lifecycle

Start this component.

Should not throw an exception if the component is already running.

In the case of a container, this will propagate the start signal to all components that apply.

Specified by:

start in interface Lifecycle

See Also:

SmartLifecycle.isAutoStartup()

stop

public void stop()

Description copied from interface: Lifecycle

Stop this component, typically in a synchronous fashion, such that the component is fully stopped upon return of this method. Consider implementing SmartLifecycle and its stop(Runnable) variant when asynchronous stop behavior is necessary.

Note that this stop notification is not guaranteed to come before destruction: On regular shutdown, Lifecycle beans will first receive a stop notification before the general destruction callbacks are being propagated; however, on hot refresh during a context's lifetime or on aborted refresh attempts, a given bean's destroy method will be called without any consideration of stop signals upfront.

Should not throw an exception if the component is not running (not started yet).

In the case of a container, this will propagate the stop signal to all components that apply.

Specified by:

stop in interface Lifecycle

See Also:

SmartLifecycle.stop(Runnable), DisposableBean.destroy()

isRunning

public boolean isRunning()

Description copied from interface: Lifecycle

Check whether this component is currently running.

In the case of a container, this will return true only if all components that apply are currently running.

Specified by:

isRunning in interface Lifecycle

Returns:

whether the component is currently running

doHandshake

public ListenableFuture<WebSocketSession> doHandshake(WebSocketHandler webSocketHandler,
                                                      String uriTemplate,
                                                      Object... uriVars)

Specified by:

doHandshake in interface WebSocketClient

Overrides:

doHandshake in class AbstractWebSocketClient

doHandshakeInternal

public ListenableFuture<WebSocketSession> doHandshakeInternal(WebSocketHandler wsHandler,
                                                              HttpHeaders headers,
                                                              URI uri,
                                                              List<String> protocols,
                                                              List<WebSocketExtension> extensions,
                                                              Map<String,Object> attributes)

Description copied from class: AbstractWebSocketClient

Perform the actual handshake to establish a connection to the server.

Specified by:

doHandshakeInternal in class AbstractWebSocketClient

Parameters:

wsHandler - the client-side handler for WebSocket messages

headers - the HTTP headers to use for the handshake, with unwanted (forbidden) headers filtered out (never null)

uri - the target URI for the handshake (never null)

protocols - requested sub-protocols, or an empty list

extensions - requested WebSocket extensions, or an empty list

attributes - attributes to associate with the WebSocketSession, i.e. via WebSocketSession.getAttributes(); currently always an empty map.

Returns:

the established WebSocket session wrapped in a ListenableFuture.

getUser

@Nullable
protected Principal getUser()

Return the user to make available through WebSocketSession.getPrincipal(). By default this method returns null