publish-subscribe

问题 I am using the sub/pub pattern via mufa to make communication between React components instead of props. Then, we will mitigate the logic in the Parent component (as you will notice that in the following snippet). const {on, fire} = mufa; class Input extends React.Component { onChange(event) { fire('input_change', event.target.value); } render() { return <input onChange={this.onChange.bind(this)} /> } } class Label extends React.Component { state= {text: ""}; componentDidMount() { on('input

问题 I have read something about "messaging system" using the MQTT protocol. But i was always reading about the constellation: using Android as a MQTT-Client and a MQTT-Server which is not installed on a Android smartphone oder tablet (but as a standalone server). Is it possible to use one Android-Tablet as a MQTT-Server and some other Android-Tablets (for example 5 Tablets) as MQTT-Clients?? And if this is possible, is it possible to use the one Android-Tablet which is a MQTT-Server, also as a

问题 If I change a Session var and trigger a re-subscription via autosubscribe , is there any callback mechanism to wait until the 'latest' data is down from the server? [1] If you take a look at this gist you'll see some code that logs the content of a collection over time as the subscription changes. A relevant section of the output: at Subscribed; comments are: first post on #1 - second post on #1 at Flushed; comments are: first post on #1 - second post on #1 at Subscription complete; comments

问题 I know some options using ruby on rails and/or node.js and PubNuB, a service that has many APIs so you can send/receive notifications between (almost) any platform. I now how to send messages from PHP and how to receive them there using Amazon SNS, but how can I receive a push notification (a SNS message) on a JS/jQuery script? Thanks. 回答1: Yes, but not directly and you'll have to poll for messages on a timer... In the Product Details page under the heading "Flexible", you'll see that none of

问题 I know some options using ruby on rails and/or node.js and PubNuB, a service that has many APIs so you can send/receive notifications between (almost) any platform. I now how to send messages from PHP and how to receive them there using Amazon SNS, but how can I receive a push notification (a SNS message) on a JS/jQuery script? Thanks. 回答1: Yes, but not directly and you'll have to poll for messages on a timer... In the Product Details page under the heading "Flexible", you'll see that none of

问题 redis supports pub-sub zmq also supports pub-sub via a message broker What would be the architectural pros\cons for choosing between them? I'm aiming at points which are beyond the obvious use-case specific performance benchmarking that should be done (here's a nice example). Assume use of a high-level language such as Python. 回答1: I have worked with both ZeroMQ and Redis with python. I would say ZeroMQ is more robust, it offers real simple load balancing and also more than pub-sub, like

问题 redis supports pub-sub zmq also supports pub-sub via a message broker What would be the architectural pros\cons for choosing between them? I'm aiming at points which are beyond the obvious use-case specific performance benchmarking that should be done (here's a nice example). Assume use of a high-level language such as Python. 回答1: I have worked with both ZeroMQ and Redis with python. I would say ZeroMQ is more robust, it offers real simple load balancing and also more than pub-sub, like

问题 I have 2 services. Both of them need subscribe to the same channel. The 2 services are load balanced. Each service runs on multiple servers. So how can I be sure only 1 instance of each service consume the message of that channel. Is this supported on Redis? Thanks 回答1: Pubsub doesn't work that way - the message goes to all connected subscribed clients. However, you could set it up so that the channel is a notification of an update to a list. That way all clients will get the message, but

问题 EDIT: this question, some of the answers, and some of the comments, contain a lot of misinformation. See how Meteor collections, publications and subscriptions work for an accurate understanding of publishing and subscribing to multiple subsets of the same server collection. How does one go about publishing different subsets (or "views") of a single collection on the server as multiple collections on the client? Here is some pseudo-code to help illustrate my question: items collection on the

问题 In the Discover Meteor examples, what's the diff between "posts" and "Posts"? Why is it that when we do an insert from the server we use "posts" but when querying from the browser we use "Posts"? Wouldn't the system be confused by the case differences? I see the variable assignment for client Posts to the server posts in posts.js. Is it a conventional notation to capitalize client and use small caps for server? Posts = new Meteor.Collection('posts') Why does server/fixtures.js use "Posts"? I