I am using websocket with spring boot and stomp messaging protocol, where i created a HTML and using javascript event listener code to publish and subscribe the data. I can see publisher data in network tab and i can process the request in java as well. but subscriber data not showing. could any one help on this?
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I want to build a messaging backend service (similar to whatsapp) using spring boot and websockets.
I have look online at the examples of spring boot websockets.
I see how I would send a message to the server from client 1 using the #MessageMapping annotation.
However assuming client 2 (recipient of the message) is also connected to the server with websockets how would I send a message to them.
I have seen the sendToUser annotation however it seems to me that that sends the message to client 1 (the sender of the message).
Is there a map of client ids to websocket sessions or something so that if I know the message should go to (client 2). I can gethis active websocket session and then send him the message?
Is there a way to send message from Spring Kafka to Angular without using Websocket?
I use Spring as service side, and Angular as Client side.
When, I send a Kafka message from Spring server-side, I just want to transmit this message to Angular based client side.
I used this code in Spring-server to send message:
kafkaTemplate.send(topic, payload);
Actually my question is nearly same of this:
Actually my question is nearly same of this:
Receiving Kafka event on web browser real time
You can use Kafka REST API (proxy), it lets you to call Kafka directly from you client javascript and so you could consume/send events directly.
Have a look: https://github.com/confluentinc/kafka-rest
I am working to build an application (Server side) which should pick message from tibco jms queue and then post that to a url at which the Client (written in angular js) will listen, and also from client when some actions are taken then the server should listen to those actions and perform respective actions.
I can read from tibco jms queue and can place it to a spring integration channel.
My question here is that, can this be build using spring integration websocket adaptors (inbound & outbound) ? If yes then can someone help me with some references for sending to the client and receiving from the client adaptor configurations ?
All the info about Spring Integration Websocket module is in the Reference Manual.
You also can take a look to a couple samples:
Simple plain Websockets
Chat based on STOMP protocol
I need a simple web-app in spring-boot that listens for messages on a JMS queue and when arriving it should appear on a webpage via WebSocket.
I have searched for examples and found several individual; either WebSocket or JMS which I have tested on their own but have not succeeded in wiring it together.
I have searched for an example but not found any and in my mind I think it should be pretty easy since it's a very basic requirement.
Do you know about any example with JMS and HTML display via WebSocket that you can share or can give some hints or help for me to solve it?
The Spring Integration comes to the rescue.
You can write <int-jms:message-driven-channel-adapter> to read messages from JMS queue and forward them to the <int-websocket:outbound-channel-adapter>. Where the last one just sends messages to the connected WebSocket session(s).
See these Spring Integration samples on the matter:
https://github.com/spring-projects/spring-integration-samples/tree/master/basic/jms
https://github.com/spring-projects/spring-integration-samples/tree/master/basic/web-sockets
UPDATE
To send the message to all subscribed WebSocket session you should do something like this:
<int:splitter input-channel="enricheMessage" output-channel="sendMessage" apply-sequence="false">
<int-groovy:script>
#serverWebSocketContainer.sessions.keySet().collect {
org.springframework.integration.support.MessageBuilder.withPayload(payload)
.copyHeaders(headers)
.setHeader('simpSessionId', it)
.build()
}
</int-groovy:script>
</int:splitter>
With this Groovy script I retrieve session ids from the serverWebSocketContainer (all those connected clients), iterate over them to build messages to send them over their websocket. And split finally, to send to the <int-websocket:outbound-channel-adapter> one by one.
We're using spring-messaging websocket with STOMP. Now we've defined multiple #SubscribeMapping methods, but is there also some sort of callback that gets fired when a client application disconnects from the socket?
We got a list of connect clients and some additional properties, like status. Status field needs to be updated when the client application disconnects.
Any suggestions on how to achieve this in Spring? I've tried implementing ApplicationListener however, there's no usefull information in the OnSessionDisconnect object.