event-driven | 易学教程

What tools to use on documenting event schema

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问题 Our team is starting to implement event driven designs. We are now figuring what's the best tool/s and practices for documenting the schema of these events. What are the common tools used for this use case? Any links or suggestions is appreciated. 回答1: I would start off with the common CloudEvents spec and model my events based on that, i.e., define the events as subtypes of the generic CloudEvent model. The benefit here is interoperability with other systems based on the same spec as well as

Event driven programming in Ext JS

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问题 I'm working on an application where different widgets from different plugins would be loaded into a host, and they don't know of each other. So I want to use EDP and in one widget raise an event (for example, UserDeleted) and in another widget, subscribe to that event (the famous publisher/subscriber, or let's get more specific, observer pattern). In jQuery I use trigger() and bind() methods to accomplish this. However, I'm not able to find anything equivalent in Ext JS. Am I missing

Winforms subscribing to own events

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问题 One common thing I see developers doing in WinForms is forms/controls subscribing to their own events so you get this.Load += new System.EventHandler(this.WelcomeQuickViewWF_Load); this.Activated += new System.EventHandler(this.WelcomeQuickViewWF_Activated); rather than protected override void OnActivated(EventArgs e) { } Now I know the second way is more Object Oriented, the first way is event driven and I tend to refactor towards overriding - is there any reason NOT to do this? What I don't

Creating a simple event driven architecture

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问题 Having a bit of trouble with a project at the moment. I am implementing a game and I'd like to have it event-driven. So far I have an EventHandler class which has an overloaded method depending on what type of event is generated(PlayerMove, Contact, Attack, etc) I will have either the game driver or the class generate the events. My question is how can I efficiently handle the events without tightly coupling the event generating classes to the event handler and making the use of EDA redundant

Event grid throughput limit

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I'm new to azure event grid concepts and currently doing research on event grid to implement in our project. Can any one tell about the throughput of event grid, how many events I can push per second and what is the egress of event grid per second, means count of output events per second from event grid. I asked Microsoft about this topic and this was their response: Nape: Publish rate limit is about 5000 events per second. This is the events you can publish to Event Grid. You can achieve rates higher than this if the service instance is not as loaded. Keep in mind EG is a multitenant system.

How to handle transaction in event driven architecture?

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I'm currently playing with DDD & CQRS, and I moved forward a legacy application. Let's say I have an Article entity, on which I can cast votes. When a Vote is casted on an Article, I want to increment or decrement a counter accordingly to the value of the vote. This counter is part of my Query model and thus I don't think it fits the Domain Model, for such reasons, I decided to write a CastArticleVoteService in which I put the business logic about a vote, and I dispatch an Event to be handle by a custom Event Handler which in turns update the counter in a database. First of all, I was

Event grid throughput limit

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问题 I'm new to azure event grid concepts and currently doing research on event grid to implement in our project. Can any one tell about the throughput of event grid, how many events I can push per second and what is the egress of event grid per second, means count of output events per second from event grid. 回答1: I asked Microsoft about this topic and this was their response: Nape: Publish rate limit is about 5000 events per second. This is the events you can publish to Event Grid. You can

JavaScript | Angular | Mediator Pattern: Tactics for Obviating Circular Dependencies In AngularJS

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问题 Ways to Implement Dependency Inversion Principle in AngularJS Case Study: The Mediator Pattern Normally, implementing a Mediator/Director entails both Director and Colleague(s) having a reference to each other. Not difficult when Director is responsible for Module-Lifecycle Management (MLM) : Director creates Colleagues while passing itself in during construction: var Director = function Director($$) { ... function init(...) { _moduleA = new ModuleA(this); _moduleB = new ModuleX(this);

how to use AnyEvent::Handler with socket that has port reuse

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问题 Recently I ran into a great perl module "AnyEvent", which allows user to do asynchronous/event-driven programing. Created the following snippet which works fine. The problem I have is that after it opens and closes lots sockets, it quickly exhausted all the client ports ("netstat -ant" shows 20,000+ sockets are in TIME_WAIT state). $hdl = new AnyEvent::Handle ( connect => [$ip, $port], on_connect=> sub { my ($handle, $host, $port, $tmp) = @_; #print "connect routine for $handle->{ue}\r\n";

How socket.io works

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问题 I would like to know how socket.io methods work for emitting a certain event, I've read that it is not like long-polling method but a different one that can work on all of different browsers ... How could a client keep-in-contact with the server without a long polling request? I'm new at node.js and I would like to implement my own system for eventdriven servers (yes...reinvent the wheel!) because I want to touch by hands what is going behind this so easy "socket.io - emit()" method. Thanks