what emit

Signals and Slots Signals and slots are used for communication between objects. The signal/slot mechanism is a central feature of QT and may be the most distinct part of QT and other toolkits. In graphical user interface programming, we often

Map-reduce is a computational model, which simply means that a large amount of work (data) decomposition (MAP) is performed, and then the results are combined into the final result (REDUCE).MongoDB offers a very flexible map-reduce, which is also

1. Website: https://github.com/greedying/vux-uploader2. InstallationNPM Install vux-uploader--savenpm install--save-dev babel-preset-es2015. BABELRC{ "presets": [ ["env", { "modules": false, "targets": { "browsers": ["> 1%",

In the previous article, I translated an article on the signal and slot mechanism to explain the QT signal and slot working mechanism-translation. In this article, I will analyze the mechanism from QT source according to my own understanding. It is

1. MongoDB MapReduce is equivalent to Mysql's groupby, so it is easy to use MapReduce for parallel statistics on MongoDB. MapReduce is used to implement two functions: Map function and Reduce function. Map function calls emit (key, value), traverses

Sockets are used for real-time communication between the browser and the server. In the past, regular polling was often used to simulate real-time communication, but this undoubtedly increased the pressure on the server.Here are some uses of the

This article mainly introduces Node. in js, the event transmitter mode is used to implement event binding. This article also explains the basic knowledge of callback mode, transmitter mode, and event type. For more information, see Node, many

2.1 StormBasic ConceptsBefore running a storm task, you need to know some concepts: Topologies Streams Spouts Bolts Stream groupings Reliability Tasks Workers Configuration The storm cluster and the

Detailed description of Python self-built logging module and python self-built logging Module Easy to use At first, we used the shortest code to experience the basic functions of logging. Import logginglogger = logging. getLogger () logging.

IntroducedThe Qtimer is a QT-band timer class, and the Qtimer runtime is dependent on the event loop, and in a nutshell, Qtimer is not available in a thread that does not turn on the event loop (EXEC () is not called). By analyzing the QT source, it

Note: This article refers to the blog post [RxSwift into the pit interpretation-you need to know the various concepts] (http://www.codertian.com/2016/11/27/RxSwift-ru-keng-ji-read-document/), Rxswift Basic use for personal study and notes required

Webpack is a pleasant and worrying, powerful but requires a certain amount of learning costs. Before exploring the Webpack plug-in mechanism, we need to understand an interesting thing, the Webpack plug-in mechanism is the skeleton of the entire

http://blog.csdn.net/sheen1991/article/details/51745673 Storm Study Notes First, Introduction The storm version used in this article is 1.0.1 Storm is a free, open-source distributed real-time computing system that makes it easier to reliably

In the actual development process, a function is implemented, which needs to be handled by multiple threads. For example, room temperature monitors need to monitor the temperature of different rooms, and the temperature sensor is transferred and

RxJava development requires 4-Observables FilteringFilter Observables In the previous chapter, we learned how to use RxJava to create an Android project and how to create an observability list to populate the RecyclerView. We now know how to create

The event emitter is another important asynchronous programming technique in node that is outside of the callback function. In the graphics interface programming library such as MFC, event emitter is very common, for example, mouse click event,

For a front-end frame, it's easy to think about DOM events, such as mouse clicks and page scrolling, to bring up events. But what we're saying here is that the events and DOM events in angular are not a thing.Publication of eventsWe can do this by

(Http://www.cnblogs.com/kidon/archive/2006/09/06/495936.aspx) Introduction Sometimes, I run them ss the need to dynamically invoke the method of an object, where the actual method might not be known until run-time. usually, reflecting is nice, but

Reprint Please specify: Theviper http://www.cnblogs.com/TheViperThe last one tells the execution flow of the first request (handshake), which is how the Engine.io transmits the data after the handshake.Engine.io binds the request event for HTTP. In

QT Development will know that Qlabel is not the default clicked event, but Qt has a good set of signal/slot mechanism, and QT is based on C + + object-oriented thinking to design, then we can easily define some classes by ourselves, Rewrite some of