event-driven | 易学教程

jQuery custom events on non-DOM objects

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问题 I read some code recently that does something like this: bob = {'name': 'Bob Smith', 'rank': 7}; $(bob).bind("nameChanged", function () { /* ... */}); // ... $(bob).trigger("nameChanged"); This appears to work. But I can't find anything in the jQuery documentation or source about calling the jQuery constructor with an object that is neither a selector nor a DOM node. So my question is, is this a supported use, or is it essentially working by accident? If you wanted to use an event-driven

Microservices async operation HTTP response

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问题 We're building a microservice app where clients can create projects . The following diagram shows the technical flow of this process: My question: what HTTP response should the API gateway return to the client (step 1.)? My initial idea was to give back a 202, but the problem there is that I don't know the Location yet ( /projects/{id} ), because the id of the project will be created at the Project Management Service. 回答1: Considering that the IDs of the newly created project entity is not

Android smoothScrollTo not invoking onScrollStateChanged

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问题 I am using smoothScrollBy() to scroll to a specific position in a ListView . I would like to be notified when the ListView is done scrolling to integrate it with the current onScrollStateChanged() event that is fired off when the user scrolls with their finger. Currently I'm using a Timer that runs 100ms after the duration of the smooth scroll, but that is not as event driven as I would prefer. 回答1: If you have implemented the OnScrollListener for your listview you can watch for when the

How socket.io works

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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 for your helps! Here's how socket.io works in a nutshell: First off, socket.io is a thin protocol layer

Creating a simple event driven architecture

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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? I want to design my own simple handler and not use the built-in Java one for this If you want to have

How is event driven programming implemented?

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问题 I was looking on how the twisted and node.js frameworks work and I am trying to understand exactly how the operating system supports I/O operations using callbacks. I understand it's good because we need less threads because we don't need to have blocked threads waiting for I/O operations. But something has to call the callback once the I/O is finished. How is this implemented by the operating system? 回答1: One approach is to have the OS attach information about anyone waiting for a callback

Microservices async operation HTTP response

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We're building a microservice app where clients can create projects . The following diagram shows the technical flow of this process: My question: what HTTP response should the API gateway return to the client (step 1.)? My initial idea was to give back a 202, but the problem there is that I don't know the Location yet ( /projects/{id} ), because the id of the project will be created at the Project Management Service. Considering that the IDs of the newly created project entity is not known at the request time (i.e. it is generated after the insertion into the database) you indeed cannot

Event-driven architecture and structure of events

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问题 I'm new to EDA and I've read a lot about benefits and would probably be interested to apply it during my next project but still haven't understood something. When raising an event, which pattern is the most suited: Name the event "CustomerUpdate" and include all information (updated or not) about the customer Name the event "CustomerUpdate" and include only information that have really been updated Name the event "CustomerUpdate" and include minimum information (Identifier) and/or a URI to

where does node.js fit within the web development context?

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问题 I know that node.js is said to be "event-driven I/O" server-side javascript hosted on V8 Javascript engine . I visited the node.js website, and then read the wikipedia entry, but cant quite get the whole idea of where to use it and how it will be useful. "Event-driven I-O"? "V8 Javascript engine"? In some context though, I see that using "server-side" javascript as a little overkill..I take for instance this piece of code in the wikipedia entry of node.js: var http = require('http'); http

Microservice data replication patterns

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In a microservice architecture, we usually have two ways to communicate 2 microservices. Let’s say service A needs to get information from service B. The first option is an remote call, usually synchronous over HTTPS, so service A query an API hosted by service B. The second option is adopting an event-driven architecture, where the state of service B can be published and consumed by service A in asynchronous way. Using this model, the service A can update its own database with the information from the service B’s events and all queries are made locally in this database. This approach has the