This change ensures the state of a SockJS session is set to CLOSED
immediately after close is invoked. This avoids duplicate invocations
of afterConnectionClosed in WebSocket transport.
Issue: SPR-11884
Update WebSocketSession toString methods to include the handshake URI
and add id and URI fields to ensure they're available after close().
Log WebSocket session open and close events at INFO.
Remove trace messages for destinations that do not match.
Issue: SPR-11884
Optimize logging with tracking the opening and closing of WebSocket
sessions and STOMP broker connections in mind.
While the volume of messages makes it impractical to log every message
at anything higher than TRACE, the opening and closing of connections
is more manageable and can be logged at INFO. This makes it possible to
drop to INFO in production and get useful information without getting
too much in a short period of time.
The logging is also optimized to avoid providing the same information
from multiple places since messages pass through multiple layers.
Issue: SPR-11884
Prior to this commit, the ServletResponseHttpHeaders.get method
would throw an NPE when used under Wildfly 8.0.0.Final and 8.1.0.Final.
This can be traced to WFLY-3474, which throws an NPE when calling
HttpServletResponse.getHeaders("foo") and that header has not
been defined prior to that.
This would cause NPE being thrown by AbstractSockJsService when
checking for CORS HTTP headers in the server HTTP response.
This commit surrounds that method call in AbstractSockJsService and
guards against this issue.
Issue: SPR-11919
In a recent CI build failure a test timed out waiting for a message:
https://build.spring.io/browse/SPR-PUB-1316
In fact there was a WebSocket transport failure originating in Jetty's
WebSocket Parser. However this failure is only apparent by looking at
the logs. This change adds a check if a transport error ocurred while
we were waiting and throws an AssertionError.
Sessions connected to a STOMP endpoint are expected to receive some
client messages. Having received none after successfully connecting
could be an indication of proxy or network issue. This change adds
periodic checks to see if we have not received any messages on a
session which is an indication the session isn't going anywhere
most likely due to a proxy issue (or unreliable network) and close
those sessions.
Issue: SPR-11884
Commit 5d2e6f enabled the setRemoveOnCancelPolicy of the SockJS
ScheduledThreadPoolExecutor by default. However that property is only
available in JDK 1.7 or later. This change fixes the issue and
introduces an extension of ThreadPoolTaskScheduler for for use with
SockJS which is necessary in any case since ThreadPoolTaskScheduler
does not expose the underlying ScheduledThreadPoolExecutor otherwise.
Issue: SPR-11918
This change sets the removeOnCancelPolicy on the SockJS
ScheduledThreadPoolExecutor to true. This ensures that cancelled
tasks are removed immediately to avoid the "unbounded retention
of cancelled tasks" that is mentioned in the Javadoc of
ScheduledThreadPoolExecutor:
"By default, such a cancelled task is not automatically removed from
the work queue until its delay elapses. While this enables further
inspection and monitoring, it may also cause unbounded retention of
cancelled tasks. To avoid this, set setRemoveOnCancelPolicy to true,
which causes tasks to be immediately removed from the work queue at
time of cancellation."
Issue: SPR-11918
This change ensures the server "WebSocketHandler" is notified of the
opening of a session before writing the open frame to the remote
handler. Any messages sent by the server "WebSocketHandler" while
getting notified of the opening get cached and flushed after the open
frame has been written.
This change introduces locking in AbtractHttpSockJsSession to guard
access to the HTTP response. The goal is to prevent contention between
client requests to receive messages (i.e. long polling) and
the application trying to write.
Issue: SPR-11916
This change adds a new implementation of WebSocketClient that can
connect to a SockJS server using one of the SockJS transports
"websocket", "xhr_streaming", or "xhr". From a client perspective
there is no implementation difference between "xhr_streaming" and
"xhr". Just keep receiving and when the response is complete,
start over. Other SockJS transports are browser specific
and therefore not relevant in Java ("eventsource", "htmlfile" or
iframe based variations).
The client loosely mimics the behavior of the JavaScript SockJS client.
First it sends an info request to find the server capabilities,
then it tries to connect with each configured transport, falling
back, or forcing a timeout and then falling back, until one of the
configured transports succeeds.
The WebSocketTransport can be configured with any Spring Framework
WebSocketClient implementation (currently JSR-356 or Jetty 9).
The XhrTransport currently has a RestTemplate-based and a Jetty
HttpClient-based implementations. To use those to simulate a large
number of users be sure to configure Jetty's HttpClient executor
and maxConnectionsPerDestination to high numbers. The same is true
for whichever underlying HTTP library is used with the RestTemplate
(e.g. maxConnPerRoute and maxConnTotal in Apache HttpComponents).
Issue: SPR-10797
This change adds support for a custom "websocket" scope.
WebSocket-scoped beans may be injected into controllers with message
handling methods as well as channel interceptor registered on the
"inboundClientChannel".
Issue: SPR-11305
Before this change, subscribing to a user destination and use of
@SendToUser annotation required an authenticated user.
This change makes it possible to subscribe to a user destination from
WebSocket sessions without an authenticated user. In such cases the
destination is associated with one session only rather than with a
user (and all their sessions).
It is then also possible to send a message to a user destination
via "/user/{sessionId}/.." rather than "/user/{user}/...".
That means @SendToUser works relying on the session id of the input
message, effectively sending a reply to destination private to the
session.
A key use case for this is handling an exception with an
@MessageExceptionHandler method and sending a reply with @SendToUser.
Issue: SPR-11309
Animal sniffer provides tools to assist verifying that classes
compiled with a newer JDK are compatible with an older JDK.
This integratesthe latest version of the tool (1.11) that
permits the use of custom annotations. Added @UsesJava7,
@UsesJava8 and @UsesSunHttpServer and annotated the few places
where we rely on a specific environment.
The verification process can be invoked by running the 'sniff'
task.
Issue: SPR-11604
polishing
The original fix for SPR-11423:
32e5f57e64
was insufficient when using an external broker since the original
destination header has to be in the "native headers" map (i.e. with
STOMP headers) in order to be included in messages broadcast by
the broker.
The BufferingStompDecoder now decorates rather than extend
StompDecoder. This allows a single StompDecoder instance to be
configured and extended independantly while buffering remains a
separate concern.
Mutate rather than re-create headers when decoding STOMP messages
before a message is sent on a message channel.
Use MessageBuilder.createMessage to ensure the fully prepared
MessageHeaders is used directly MessageHeaderAccessor instance.
Issue: SPR-11468
Refine semantics of ID and TIMESTAMP headers provided to protected
MessageHeaders constructor.
Refactor internal implementation of MessageHeaderAccessor.
Support mutating headers from a single thread while a message is being
built (e.g. StompDecoder creating message + then adding session id).
Improve immutablity in NativeMessageHeaderAccessor and in
StompHeaderAccessor.
Optimize object creation for initializing messages and subsequent
accessing their headers.
Introduce MessageHeaderAccessorFactory support to enable applying a
common strategies for ID and TIMESTAMP generation to every message.
Add MessageBuilder shortcut factory method for creating messages from
payload and a full-prepared MessageHeaders instance. Also add
equivalent constructors to GenericMessage and ErrorMessage.
Issue: SPR-11468
The UserDestinationMessageHandler adds a header providing a hint for
what the original destination a user may have used when subscribing.
That is then used when writing messages back to WebSocket clients to
ensure they dont see the internally used, transformed user destination.
This change moves the header name constatn to make it more broadly
applicable. For example SPR-11645.
Prior to this commit, @SubscribeMapping mapped methods (backed with
@SendTo* annotations, or not) would send MESSAGEs with the wrong
destination. Instead of using the original SUBSCRIBE destination, it
would use the lookup path computed from the configured prefixes in the
application.
This commit fixes this issue - now @SubscribeMapping MESSAGEs use the
original SUBSCRIBE destination.
Issue: SPR-11648
Update some native WebSocket session getters to return basic
information after it is closed. It is required for example in
SubProtocolWebSocketHandler#afterConnectionEstablished() or
StompSubProtocolHandler#afterSessionStarted().
Issue: SPR-11621
Proactively notify all active WebSocket sessions when a shutdown is
progress. Sessions then can ignore further attempts to send messages
and also stop stop trying to flush messages right away.
BufferingStompDecoder message buffer size limit can now be configured
with JavaConfig MessageBrokerRegistry.setMessageBufferSizeLimit() or
with XML <websocket:message-brocker message-buffer-size="">.
Issue: SPR-11527
Before this change the StompDecoder decoded and returned only the first
Message in the ByteBuffer passed to it. So to obtain all messages from
the buffer, one had to loop passing the same buffer in until no more
complete STOMP frames could be decoded.
This chage modifies StompDecoder to return List<Message> after
exhaustively decoding all available STOMP frames from the input buffer.
Also an overloaded decode method allows passing in Map that will be
populated with any headers successfully parsed, which is useful for
"peeking" at the "content-length" header.
This change also adds a BufferingStompDecoder sub-class which buffers
any content left in the input buffer after parsing one or more STOMP
frames. This sub-class can also deal with fragmented messages,
re-assembling them and parsing as a whole message.
Issue: SPR-11527
When a send timeout is detected, the WebSocket session is now closed
with a custom close status that indicates so. This allows skipping
parts of the close logic that may cause further hanging.
Issue: SPR-11450
Before this change SockJsSession implementations of WebSocketSession
used synchronization around its method implementations protecting
internal state and ensuring only a single thread is sending messages
at a time.
A WebSocketSession is generally expected to be used from one thread
at a time and now that application messages are sent through
ConcurrentWebSocketSessionDecorator, there is no concern about
application messages sent from the different threads.
While there are some remaining concerns, those can be addressed
without using the synchronized keyword. This change removes it from
the methods of all SockJS session implementations.
Issue: SPR-11450
Before this change the decorator ensured that for a specific WebSocket
session only one thread at a time can send a message. Other threads
attempting to send would have their messages buffered and each time
that occurs, a check is also made to see if the buffer limit has been
reached or the send time limit has been exceeded and if so the session
is closed.
This change adds further protection to ensure only one thread at a time
can perform the session limit checks and attempt to close the session.
Furthermore if the session has timed out and become unresponsive,
attempts to close it may block yet another thread. Taking this into
consideration this change also ensures that state associated with the
session is cleaned first before an attempt is made to close the session.
Issue: SPR-11450
Since we now wrap the WebSocketSession with a concurrent decorator, the
synchronized keyword around message sending needed to be removed.
Issue: SPR-11586
Prior to this commit, configuring a custom handshakeHandler when setting
up a stomp-endpoint with SockJS would not be taken into account:
<websocket:stomp-endpoint path="/foo">
<websocket:handshake-handler ref="customHandler"/>
<websocket:sockjs/>
</websocket:stomp-endpoint>
This commit fixes this by creating and registering a
WebsocketTransportHandler (with this handshakeHandler) as a
transportHandler override for the SockJSService.
Issue: SPR-11568
Prior to this commit, the codebase was using a mix of log4j.xml
and log4j.properties for test-related logging configuration. This
can be an issue as log4j takes the xml variant first when looking
for a default bootstrap configuration.
In practice, some modules declaring the properties variant were
taking the xml variant configuration from another module.
The general structure of the configuration has also been
harmonized to provide a standard console output as well as an
easy way to enable trace logs for the current module.
The clientInboundChannel and clientOutboundChannel now use twice
the number of available processors by default to accomodate for some
degree of blocking in task execution on average.
In practice these settings still need to be configured explicitly in
applications but these should serve as better default values than
the default values in ThreadPoolTaskExecutor.
Issue: SPR-11450
This change exposes the WebSocketSession attributes through a message header.
The StompSubProtocolHandler adds this to incoming messages.
For now messaging handling methods can access the map via @Header, e.g.:
@Header(StompHeaderAccessor.SESSION_ATTRIBUTES) Map<String, Object> attrs) {
Issue: SPR-11566
Add accessor for brokerAvailable in AbstractBrokerMessageHandler
Ensure brokerAvailable is set even if eventPublisher is not
Add tests BrokerMessageHandlerTests
Turn off brokerAvailable when StompBrokerRelayMessageHandler stops
Actually stop message handling when brokerAvailable=false
Improve log messages
Issue: SPR-11563
Prior to this commit, the `relay-port` attribute of the
`<websocket:stomp-broker-relay />` tag was of type `xsd:int`.
This prevents developers from using `PropertyPlaceholderConfigurer`,
even though this configuration key is a good candidate for such use
(this value depends on prod/staging/etc environment).
This commit changes that type to `xsd:string`.
Issue: SPR-11537
After this change, AbstractSockJsService does not add CORS headers if
the response already contains an "Access-Control-Allow-Origin" header.
Essentially it backs off assuming CORS headers are handled centrally
e.g. through a Filter.
In order to support this, the ServletServerHttpResponse now returns an
instance of HttpHeaders that also provides access to headers already
present in the HttpServletResponse.
Issue: SPR-11443
- Deleted empty AbstractWebSocketClientTests class.
- AbstractServletHandlerMethodTests and AbstractHttpRequestTests are
now actually declared as abstract.
- The following classes are not abstract but currently have an
"Abstract" prefix and therefore get ignored by the Gradle build.
This commit renames each of these by deleting the "Abstract" prefix.
- AbstractFlashMapManagerTests
- AbstractMappingContentNegotiationStrategyTests
- AbstractSockJsServiceTests
- AbstractWebSocketHandlerRegistrationTests
The Servlet API does not provide notifications when a client
disconnects, see see https://java.net/jira/browse/SERVLET_SPEC-44.
Therefore network IO failures may occur simply because a client has
gone away. Before this change that could fill logs with unnecessary
stack traces.
After this change we make a best effort to identify such network
failures, on a per-server basis (tested with Jetty, Tomcat, Glassfish,
and WildFly), and log them under a separate log category.
A simple one-line message is logged at DEBUG level (i.e. no stack trace)
while a full stack trace is shown at TRACE level.
Issue: SPR-11438
Before this change CompositeMessageConverter had a ContentTypeResolver
field that was in turn set on all contained converters.
After this change that field is removed and effectively
CompositeMessageConverter is a simple container of other converters.
Each converter in turn must have been configured with a
ContentTypeResolver.
Doing so means it is less likely to have unexpected consequences when
configuring converters, the ContentTypeResolver set in the composite
converter overriding the one configured in a contained converter.
Also commit 676ce6 added default ContentTypeResolver initialization
to AbstractMessageConverter, which ensures that converters are still
straight forward to configure.
Issue: SPR-11462
Before this change, when a client subscribed to a "user" destination
(e.g. /user/foo), actual messages received in response to that
subscription contained the server-translated, unique user destination
(e.g. /foo-user123).
This is not an issue for clients such as stomp.js since the
subscription is unique and sufficient to match subscription responses.
However, other STOMP clients do additional checks on the destination
of the subscription and the response.
This change ensures that messages sent to clients on user destionations
always contain a destination that matches the one on the original
subscription.
Issue: SPR-11423
The interface is to be implemented in addition to
java.security.Principal when Principal.getName() is not globally unique
enough for use in user destinations.
Issue: SPR-11327
sockjs-client expects a prelude to be written on every request with
streaming transports. The protocol tests don't make this clear and
don't expose this issue.
The test case for SPR-11183 (writing 20K messages in succession) did
expose the issue and this commit addresses it.
Issue: SPR-11183
This change adds a protected method to DefaultHandshakeHandler to
determine the user for the WebSocket session. By default it's
implemeted to obtain it from the request.
Issue: SPR-11228
The Jetty ServletWebUpgradeRequest implements getUserPrincipal to
return the Principal from the HttpServletRequest on the upgrade.
This change ensures we can fall back on that.
However the JettyRequestUpgradeStrategy still passes the user from
HttpServletRequest from the upgrade, in order to work with Jetty
9.0.x and avoid running into this 9.1.x issue:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=423118
The observed behavior was that the client does not get a response from
the WebSocket HTTP handshake. On the server the handshake actually
succeeds, the response is set correctly to status 101, and the
WebSocketHandler gets notified of the successfully established
connection.
This change flushes the ServletResponse just before returning from the
GlassfishRequestUpgradeStrategy. This is actually what Glassfish's own
TyrusServletFilter does as well at the end along with a comment that it
is a possible bug.
This commit adds an XML namespace equivalent of @EnableWebSocket and
@EnableWebSocketMessageBroker. Those are <websocket:handlers> and
<websocket:message-broker> respectively.
Examples can be found in the test suite.
This commit also alters the way MessageHandler's subscribe to their
respective MessageChannel's of interest. Rather than performing the
subscriptions in configuration code, the message channels are now
passed into MessageHandler's so they can subscribe themselves on
startup.
Issue: SPR-11063
Apply consistent styling to new classes introduced in Spring 4.0.
- Javadoc line wrapping, whitespace and formatting
- General code whitespace
- Consistent Assert.notNull messages
@EnableWebSocketMessageBroker message channel configuration can now be
customized via WebSocketMessageBrokerConfigurer. It is necessary to
make this easy and even required as part of the basic configuration
since by default the message channels are backed by a thread pool of
size 1, not suitable for production use.
Issue: SPR-11023
Two concurrent threads should not send a message on a single WebSocket
session at the same time, for example see:
http://docs.oracle.com/javaee/7/api/javax/websocket/RemoteEndpoint.Basic.html
In StompSubProtocolHandler it is quite possible that multiple messages
may be broadcast to a single WebSocket client concurrently.
This change adds synchronization around the sending of a message to a
specific cilent session.
Issue: SPR-11023
Fix a variety of typos throughout the project, primarily in
comments (javadoc or otherwise) but also in a handful of log messages
and a couple exception messages.
ISSUE: SPR-11123
The addition of SubProtocolCapable simplifies configuration since it is
no longer necessary to explicitly configure DefaultHandshakeHandler
with a list of supported sub-protocols. We will not also check if the
WebSocketHandler to use for the WebSocket request is an instance of
SubProtocolCapable and obtain the list of sub-protocols that way. The
provided SubProtocolWebSocketHandler does implement this interface.
Issue: SPR-11111
Fix remaining Java compiler warnings, mainly around missing
generics or deprecated code.
Also add the `-Werror` compiler option to ensure that any future
warnings will fail the build.
Issue: SPR-11064
Before this change spring-messaging contained a few WebSocket-related
classes including WebSocket sub-protocol support for STOMP as well
as @EnableWebSocketMessageBroker and related configuration classes.
After this change those classes are located in the spring-websocket
module under org.springframework.web.socket.messaging.
This means the following classes in application configuration must
have their packages updated:
org.springframework.web.socket.messaging.config.EnableWebSocketMessageBroker
org.springframework.web.socket.messaging.config.StompEndpointRegistry
org.springframework.web.socket.messaging.config.WebSocketMessageBrokerConfigurer
MessageBrokerConfigurer has been renamed to MessageBrokerRegistry and
is also located in the above package.
Before this change the amount of logging was too little or too much
with TRACE turned on. This change separates useful debugging
information and logs it under DEBUG and leaves more detailed
information to be logged under TRACE.
Before this change subscribing to a user-specific destination in STOMP
required manually appending a unique queue suffix provided in a header
with the CONNECTED frame.
This change removes the need to do that. Instead STOMP clients can
subscribe to "/user/queue/error" and can then begin to receive messages
sent to "/user/{username}/queue/error" without colliding with any other
user doing the same.
Issue: SPR-11077
This changes switches from using Jetty's WebSocketListener interface
to use Jetty's @WebSocket annotations instead. The change should be
transparent but the annnotations provide a little more controler
including handling pong frames.
This change also introduces a WebSocketMessage interface.
Issue: SPR-10877
- add WebSocketHttpHeaders
- client-side support for WebSocket extensions
- DefaultHandshakeHandler updates
- replace use of ServletAttributes in JettyRequestUpgradeStratey
- upgrade spring-web to jetty 9.0.5
This commits adds simple, overridable WebSocket Extension
filtering during the handshake phase and adds that
information in the WebSocket session.
The actual WebSocket Extension negotiation happens
within the server implementation (Glassfish, Jetty, Tomcat...),
so one can only remove requested extensions from
the list provided by the WebSocket client.
See RFC6455 Section 9.
Issue: SPR-10843
Commit 2397b21096 changed websocket
support to use GlassFish 4.0.1 nightlies, but broke support for 4.0. In
GlassFish 4.0.1, the package that TyrusEndpoint is located in changed.
This commit provides an abstract handler that does all required
GlassFish setup, but delegates to version specific upgrade handlers to
create the final TyrusEndpoint.
GlassFish 4.0 handler uses reflection to create its endpoint to prevent
dependency issues of depending on different versions of
tyrus-websocket-core and tyrus-container-servlet
After this change, annotated message handling methods configured to use
a destination prefix (e.g. "/app") no longer have to include the prefix
in their mapping. For example if a client sends a message to "/app/foo"
the annotated methods should be mapped with @MessageMapping("/foo").
Ensure configuration provided for WebSocketHandler's (eg interceptors,
or HandshakeHandler) are passed on to the SockJsService if congiured.
Better separate Servlet-specific parts of the configuration to make it
more obvious where non-Servlet alternatives could fit in.
Add more tests.
Improve WebSocket integration tests.
While RC2 is not yet out, we need to support RC1 as well.
This change introduces temporary code that can be removed
once RC2 becomes available to avoid having to use Tomcat
snapshots.
After this change the DefaultHandshakeHandler delegates to a
server-specific RequestUpgradeStrategy to update the HTTP response for
the handshake request and to begin the WebSocket interaction.
The DefaultHandshakeHandler however still retains the initial
validation of the WebSocket handshake including negotation of origin,
sub-protocol, etc. This allows sub-classes to override various
aspects of the negotiation independant of the WebSocket engine.
In addition to implementing ServerEndpointConfig, the
ServerEndpointRegistration now also extends
ServerEndpointConfig.Configurator making it easier to override
handshake customization methods without having to extend a separate
class.
Tomcat now provides a method for initiating a WebSocket upgrade at
runtime vs relying on JSR-356 deployment at startup. This change
switches to use that latest feature. For more information on the
Tomcat change see:
https://issues.apache.org/bugzilla/show_bug.cgi?id=55314#c7
Although ServletHttpRequest provides access to Cookies, other
implementations may not. At the moment this was only needed
for SockJS to check the value of the JSESSIONID cookie. This
is now down by parsing the raw cookie values locally.
If comprehensive cookie support is to be added, we should
probably consider HttpHeaders as a potential candidate.
A HandshakeInterceptor can be used to intercept WebSocket handshakes
(or SockJS requests where a new session is created) in order to
inspect the request and response before and after the handshake
including the ability to pass attributes to the WebSocketHandler,
which the hander can access through
WebSocketSession.getHandshakeAttributes()
An HttpSessionHandshakeInterceptor is available that can copy
attributes from the HTTP session to make them available to the
WebSocket session.
Issue: SPR-10624
The method returning query parameters now returns only query string
parameters as opposed to any Servlet request parameter.
This commit also adds a ReadOnlyMultiValueMap.
ServerHttpAsyncResponseControl wraps a ServetHttpRequest and -Response
pair and allows putting the processing of the request in async mode
so that the response remains open until explicitly closed, either from
the current or from another thread.
ServletServerHttpAsyncResponseControl provides a Serlvet-based
implementation.
A getCookies method is now available on ServerHttpRequest with one
ServletServerCookie implementation that wraps a Servlet cookie.
The SockJS service makes use of this to check for an existing session
cookie in the request.
Add SubProtocolHandler to encapsulate the logic for using a
sub-protocol.
A SubProtocolWebSocketHandler is also provided to
delegate to the appropriate SubProtocolHandler based on the
negotiated sub-protocol value at handshake.
StompSubProtocolHandler provides handling for STOMP messages.
Issue: SPR-10786
A SockJS message frame is an array of JSON-encoded messages and before
this change the use of the Jackson 2 library was hard-coded.
A Jackson 2 and Jackson 1.x implementations are provided and
automatically used if those libraries are present on the classpath.
Issue: SPR-10800
The method WsServerContainer.getServerContainer() was removed from
JSR-356 but remained in Tomcat a little while longer. Instead the
ServerContainer is obtained through a ServletContext attribute.
Tomcat has now removed this method, hence the need for this fix.
The SubscriptionRegistry and implementations are now in a package
together with SimpleBrokerWebMessageHandler and primarily support
with matching subscriptions to messages. Subscriptions can contain
patterns as supported by AntPathMatcher.
StopmWebSocketHandler no longer keeps track of subscriptions and simply
ignores messages without a subscription id, since it has no way of
knowing broker-specific destination semantics for patterns.
The Reactor Environment (that's used by the TcpClient) manages a
number of threads. To ensure that these threads are cleaned up
Environment.shutdown() must be called when the Environment is no
longer needed.
A new type MessageHeaderAccesssor provides read/write access to
MessageHeaders along with typed getter/setter methods along the lines
of the existing MessageBuilder methods (internally MessageBuilder
merely delegates to MessageHeaderAccessor). This class is extensible
with sub-classes expected to provide typed getter/setter methods for
specific categories of message headers.
NativeMessageHeaderAccessor is one specific sub-class that further
provides read/write access to headers from some external message
source (e.g. STOMP headers). Native headers are stored in a separate
MultiValueMap and kept under a specific key.
Similar to @ExceptionHandler but for message processing. Such a method
can send messages to both the message broker channel and the client
channel provided the client is subscribed to the target destination.
The "system" STOMP session is established at startup and can be used
to send messages without a client session, e.g. to support broadcasting
from a REST/HTTP handler method.
MessageHolder holds the currently processed message in a ThreadLocal,
which allows PubSubMessageBuilder to automatically add a session id
to messages to be sent.
Rename to PubSubHeaderAccessor and StompHeaderAccessor
Move the renamed classes to support packages
Remove fromPayloadAndHeaders from MessageBuilder, just use
withPayload(..).copyHeaders(..) instead.
The use of an AtomicBoolean and no lock meant that it was possible
for a message to be queued and then never be flushed and sent to the
broker:
1. On t1, a message is received and isConnected is false. The message
will be queued.
2. On t2, CONNECTED is received from the broker. isConnected is set
to true, the queue is drained and the queued messages are forwarded
3. On t1, the message is added to the queue
To fix this, checking that isConnected is false (step 1 above) and the
queueing of a message (step 3 above) need to be performed as a unit
so that the flushing of the queued messages can't be interleaved. This
is achieved by synchronizing on a monitor and performing steps 1
and 3 and synchronizing on the same monitor while performing step 2.
The monitor is held while the messages are actually being forwarded
to the broker. An alternative would be to drain the queue into
a local variable, release the monitor, and then forward the messages.
The main advantage of this alternative is that the monitor is held for
less time. It also reduces the theoretical risk of deadlock by not
holding the monitor while making an alien call. The downside of the
alternative is that it may lead to messages being forwarded out of
order. For this reason the alternative approach was rejected.
When an annotated handler returns a Message from a @SubscribeEvent
or @MessageMapping method and it contains no destination in its
headers, use the received message's destination as the response
message's destination.
Without generics, extending AbstractPubSubChannelRegistry and using
a custom Message type requires some unpleasant casting and suppression
of warnings. By genericizing PubSubChannelRegistry and
AbstractPubSubChannelRegistry these problems can be avoided.
To improve compatibility between Spring's messaging classes and
Spring Integration, the type of Message that is created has been made
pluggable through the introduction of a factory abstraction;
MessageFactory.
By default a MessageFactory is provided that will create
org.springframework.messaging.GenericMessage instances, however this
can be replaced with an alternative implementation. For example,
Spring Integration can provide an implementation that creates
org.springframework.integration.message.GenericMessage instances.
This control over the type of Message that's created allows messages
to flow from Spring messaging code into Spring Integration code without
any need for conversion. In further support of this goal,
MessageChannel, MessageHandler, and SubscribableChannel have been
genericized to make the Message type that they deal with more
flexible.
org.springframework.web.stomp is now
org.springframework.web.messaging.stomp
Also classes in the ~.stomp.server and ~.stomp.adapter packages have
been renamed.
Allow WebSocketHandler methods to raise an exception.
By default we install ExceptionWebSocketHandlerDecorator, which logs
unhandled exceptions and closes the session. That decorator can be
extended or replaced.
Any exceptions that remain unhandled still (i.e. no exception handling
decorator), are caught in the lowest level before propagating to the
WebSocket engine or a SockJS transport handler and handled the same
way. That means default behavior is guaranteed but also fully
customizable.
WebSocketHandler implementations:
- methods must deal with exceptions locally
- uncaught runtime exceptions are handled by ending the session
- transport errors (websocket engine) are passed into handleError
WebSocketSession methods may raise IOException
SockJS implementation of WebSocketHandler:
- delegate SockJS transport errors into handleError
- stop runtime exceptions from user WebSocketHandler and end session
SockJsServce and TransportHandlers:
- raise IOException or TransportErrorException
HandshakeHandler:
- raise IOException
Rossen Stoyanchev
Brian Clozel
Juergen Hoeller
Artem Bilan
Stephane Nicoll
Philippe Marschall
Sebastien Deleuze
Sam Brannen
Phillip Webb
Eric Dahl
Michael Irwin
Jan Machacek
Andy Wilkinson
Phillip Webb
Rossen Stoyanchev
Rob Winch