publish-subscribe

问题 I have a question about ZeroMQ PUB/SUB . Does the publisher create a separate queue for each individual subscriber or is there one queue for all subscribers (and hence limited by the slowest subscriber)? 回答1: Each connected subscriber gets its own queue. When a subscriber is slow, its own queue will fill up and then overflow (high water mark is by default 1,000), and its messages will get dropped. This won't affect other subscribers. 来源： https://stackoverflow.com/questions/16220679/zeromq

问题 Sorry kind of new to the Meteor framework! I Subscribed to two Publish functions. Even if both publish functions target the same Collection, they both have different functions, that I would like to display in one template. How do I achieve this. I have done allot of research but there doesn't seem to be sufficient information on how to achieve. Following are the two publish functions in code that I subscribe to: .server/main.js: Meteor.publish('MerchantTrending', function (categoryMan){ var

问题 I tried and made run this example. It worked very well. I can add as many publishers or subscribers as I want, everything will communicate thanks to the forwarder. My concern is about redundancy. If the forwarder does not respond anymore, nothing's gonna work until forwarder is up. I found an example for REQ/REP, but it can't be applied for PUB/SUB as subscribers. But idea is here. Is there a way to have something similar in a pub/sub scenario? Thank you. 回答1: First read this chapter. In the

问题 I'm pretty new to this world so I need some clarifications on it. Maybe I could be wrong on the subject. So, feel free to correct me. I'm studying how Marionette and Backbone work together. Oh yeah. Marionette gives us extension to Backbone. Really nice stuff. The thing that is not obvious to me is when to use the routing mechanism provided by Backbone and when to use publisher/subscriber pattern by Marionette. Is there any rule of thumb? Here, Where to use event aggregator in backbone

问题 I've a publication which sends limited number of records based on start and limit Metero.publish("posts",function(start,limit){ return Posts.find({},{"start":start,"limit":limit}); }); I'm subscribing to the publish function in autorun function. My problem is I already have few records of posts collection in client which is used by another table the current publish function may have records that already existed in client I just want to know the records that are sent by the current publish

问题 Currently I am working on the Angular6 project, and I have auth-http-interceptor. The problem in this file is that I want to get refresh token/acquire token from angular4-adal service every time, and for that, I have to subscribe the acquire token which will give the token and then want to assign that token in authReq object. But my intercept method's return type is Observable. Then how could I wait for subscribing the acquire token and then return next.handle(authReq). I have tried to write

问题 I am in an Ionic2 / Angular2 project using a Meteor Database. I have a Collection of Points and want to show them on a map. Every time the map-view changes, I set a new query with the new bounds . This is working quite fine already. But the collection is already really huge, so I have to reduce the publication as it slows down my app a lot. I want to restrict it also to the bounds of the shown area. So I need to update the subscription every time I send a new query. My code looks like this:

问题 Import org.zeromq.ZMQ; -For the above import statement, I am using "org folder" in jzmq master folder which consists of ZMQ.java file. -So, there is no problem with compilation. When I start running the program, It shows below exception Exception in thread "main" java.lang.UnsatisfiedLinkError: no jzmq in java.library.path at java.lang.ClassLoader.loadLibrary(Unknown Source) at java.lang.Runtime.loadLibrary0(Unknown Source) at java.lang.System.loadLibrary(Unknown Source) at org.zeromq.ZMQ.

问题 How to publish single objects seems not clear enough to me. Please what's the best way to handle this. This code snippet does not display anything on the view. Helper file singleSchool: function () { if (Meteor.userId()) { let myslug = FlowRouter.getParam('myslug'); var subValues = Meteor.subscribe('SingleSchool', myslug ); if (myslug ) { let Schools = SchoolDb.findOne({slug: myslug}); if (Schools && subValues.ready()) { return Schools; } } } }, Publish file Meteor.publish('SingleSchool',

问题 I am trying to build an application which subscribes to multiple mqtt topics, get the information, process it and form xmls and upon processing trigger an event so that these can be sent to some cloud server and the successful response from there to be sent back to the mqtt channel. <int-mqtt:message-driven-channel-adapter id="mqttAdapter" client-id="${clientId}" url="${brokerUrl}" topics="${topics}" channel="startCase" auto-startup="true" /> <int:channel id="startCase" /> <int:service