publish-subscribe

问题 Basic pubsub architecture question. At a high level, when designing pubsub, I sometimes face a choice between two architectures: Publish mutations or "new-state". Some DB state is mutated, and publishers notify of that change via pubsub. But they include enough information in the message so that the subscriber doesn't need to do a look-up on the DB. Imagine the subscriber has a cache of the DB. It could receive the mutations or new-state, and update its cache without doing a look-up.

问题 How to subscribe a IBM MQ topic from .net client in a subscriber model I have already a working copy of the code which is able to get message from the topic. string qmName = "Q1"; string hostName = "MyHost"; string strPort = "1114"; string channelName = "MyCh"; string transport = TRP; Hashtable connectionProperties = new Hashtable(); connectionProperties.Add(MQC.HOST_NAME_PROPERTY, hostName); connectionProperties.Add(MQC.PORT_PROPERTY, strPort); connectionProperties.Add(MQC.CHANNEL_PROPERTY,

问题 I'm new to Redis, and I've been messing around with the Pub/Sub. Due to dependency factors, I would like the publisher to also be the subscriber of a channel, such that when the publisher sends a message through the channel, they also receive the message. Is this possible? 回答1: No it is not possible with pub/sub because there is no persistence. When the publisher publishes the message to a channel, only the connected clients of the channel will receive the message. No message will be saved.

问题 I'm new to Redis, and I've been messing around with the Pub/Sub. Due to dependency factors, I would like the publisher to also be the subscriber of a channel, such that when the publisher sends a message through the channel, they also receive the message. Is this possible? 回答1: No it is not possible with pub/sub because there is no persistence. When the publisher publishes the message to a channel, only the connected clients of the channel will receive the message. No message will be saved.

问题 I'm new to Redis, and I've been messing around with the Pub/Sub. Due to dependency factors, I would like the publisher to also be the subscriber of a channel, such that when the publisher sends a message through the channel, they also receive the message. Is this possible? 回答1: No it is not possible with pub/sub because there is no persistence. When the publisher publishes the message to a channel, only the connected clients of the channel will receive the message. No message will be saved.

问题 The procedure for sharing data between components in a child-parent relationship is well documented and dealt with straightforwardly in the React docs. What is less obvious is the accepted way of how one shares state and arbitrary data between components that do not share a child-parent relationship. Flux is offered as a solution, and in the past I have rolled my own pub/sub system, but still there seems a great divide among reactjs developers in this arena. RxJS has been offered as a

问题 Scenario : We were evaluating ZeroMQ (specifically jeroMq ) for an event driven mechanism. The application is distributed where multiple services (both publishers and subscribers are services) can exist either in the same jvm or in distinct nodes, which depends on the deployment architecture. Observation For playing around I created a pub / sub pattern with inproc: as the transport , using jero mq (version :0.3.5) The thread publishing is able to publish (looks like getting published, at

问题 I'm trying to build a chat applicaton in react native using redis pub/sub. Searched redis client for javascript but i didn't get. Can anyone let me know how to use redis pub/sub in react native. 回答1: You have to implement redis on the backend side, not on the frontend. Redis is a database as they say on their websites here Redis is an open source (BSD licensed), in-memory data structure store, used as a database, cache and message broker For the frontend side if you want to use publish /

问题 I'm working with the paho-mqtt client and wondering if anybody of you can help me subscribing and publishing messages parallel. My Setup: I've got a couple of sensors writing data into an InfluxDB. Using subscriptions with some parameters (time, start of recording) I can afterwards get the sensordata out of the InfluxDB. I've wrote a script which subscribes to all sensors/# and hands me a list of all avalible sensors in my system, which leads me directly to my question: My Problem: Now I've

问题 Within the same application I send different message types that have a completely different format and that are totally unrelated. What is the best practice to tackle this problem? I see two different approaches here : Filter at application level, which means I receive all messages on the same puller (same subscription) Create a new subscription, this means the application will have two pullers running (one for each message type) 回答1: You anwsered your question with 2. point. If the message