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A lightweight powerful flow control component enabling reliability and monitoring for microservices. (轻量级的流量控制、熔断降级 Java 库) – alibaba/Sentinel

As distributed systems become increasingly popular, the reliability between services is becoming more important than ever before. Sentinel takes “flow” as breakthrough point, and works on multiple fields including flow control, circuit breaking and system adaptive protection, to guarantee reliability of microservices.

Sentinel has the following features:

  • Rich applicable scenarios: Sentinel has been wildly used in Alibaba, and has covered almost all the core-scenarios in Double-11 (11.11) Shopping Festivals in the past 10 years, such as “Second Kill” which needs to limit burst flow traffic to meet the system capacity, message peak clipping and valley fills, circuit breaking for unreliable downstream services, cluster flow control, etc. […]

Sorgente: alibaba/Sentinel

Please Don’t Learn to Code Unless… – DZone Agile

“Focusing On Coding Inflates the Importance of Finding the “Right” Method to Solve a Problem Rather Than the Importance of Understanding the Problem. Before we start working on a solution to a coding problem we have to decide what the problem is–if we even have one to begin with. If we let ourselves become fixated on how to solve a problem via code–regardless of if it is a programming problem or not–and lose sight of why, we gain nothing.”

Che è più o meno:

Concentrarsi  sulla programmazione porta a concentrarsi sulla ricerca del modo “giusto” di risolvere un problema invece che concentrarsi l’importanza di capire il problema stesso.

Prima di iniziare a programmare dobbiamo capire il problema e se veramente esiste. Se ci fissiamo su come risolvere un problema con la programmazione, senza considerare se questo è un problema di programmazione o meno, e dimentichiamo il perché lo stiamo risolvendo, non guadagniamo nulla.



The GNU Trove library has two objectives: Provide “free” (as in “free speech” and “free beer”), fast, lightweight implementations of the java.util Collections API. These implementations are designed to be pluggable replacements for their JDK equivalents. Whenever possible, provide the same collections support for primitive types. This gap in the JDK is often addressed by using the “wrapper” classes (java.lang.Integer, java.lang.Float, etc.) with Object-based collections. For most applications, however, collections which store primitives directly will require less space and yield significant performance gains.

CodinGame – Become a Better Developer

Game-ificazione della programmazione. Divertente.

Isomorphic JavaScript: The Future of Web Apps – Airbnb Engineering

This idea isn’t new — Nodejitsu wrote a great description of isomorphic JavaScript architecture in 2011 — but it’s been slow to adopt. There have been a few isomorphic frameworks to spring up already. Mojito was the first open-source isomorphic framework to get any press. It’s an advanced, full-stack Node.js-based framework, but its dependence on YUI and Yahoo!-specific quirks haven’t led to much popularity in the JavaScript community since they open sourced it in April 2012.

Express – Node.js web application framework

Express Fast, unopinionated, minimalist web framework for Node.js

React and Flux


A JavaScript library for building user interfaces | React

Just the UI Lots of people use React as the V in MVC. Since React makes no assumptions about the rest of your technology stack, it’s easy to try it out on a small feature in an existing project. Virtual DOM React abstracts away the DOM from you, giving a simpler programming model and better performance. React can also render on the server using Node, and it can power native apps using React Native. Data flow React implements one-way reactive data flow which reduces boilerplate and is easier to reason about than traditional data binding.

Flux | Application Architecture for Building User Interfaces

Flux is the application architecture that Facebook uses for building client-side web applications. It complements React’s composable view components by utilizing a unidirectional data flow. It’s more of a pattern rather than a formal framework, and you can start using Flux immediately without a lot of new code.

Kotlin Koans

This tutorials walks you through a series of exercises to get familiar with Kotlin.

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