SEARCH KEYWORD -- Exception
A plugin to update last_error in Delayed Job
delayed_job is a process based asynchronous task processing gem which can be ran at background. It will fork the specified number of processes to execute the tasks asynchronously. The task status is usually stored in the database so that it can be easily integrated into a Rails application where asynchronous job execution is desired. Normally when a job fails to execute or error occurs, it would save the error into the database with the column last_error. Ideally all these will be handled b...
RUBY,RUBY ON RAILS,DELAYED JOB,LAST_ERROR 2017-11-18 13:05:49
What is Hystrix and How does Hystrix work
Background In distributed systems, there is one effect where the unavailability of one service or some services will lead to the service unavailability of the whole system, this is called service avalanche effect. A common way to prevent service avalanche is do manual service fallback, in fact Hystrix also provides another option beside this. Definition of Service Avalanche Effect Service avalanche effect is a kind of effect where the service provider fails to provide service which causes t...
AVALANCHE EFFECT,HYSTRIX,DISTRIBUTED SYSTEM 2019-02-04 06:00:38
5 Reasons Your Javascript Stinks
Javascript gets a bad rap on the Internet, but there are few languages that are so dynamic, so widespread, and so deeply rooted in our lives as Javascript is. The low barrier of entry leads some people to call it a script kiddie language, others scoff at the concept of a dynamic language while riding their statically typed high horse. You and Javascript just got off on the wrong foot, and now you've made it angry. Here's five reasons why your Javascript code sucks.1. You're not using a namespace...
JavaScript,Good,Habit,Prototype,OOP 2011-04-13 12:25:37
Introducing JavaScript native file management
TL;DR The Mozilla Platform keeps improving: JavaScript native file management is an undergoing work to provide a high-performance JavaScript-friendly API to manipulate the file system. The Mozilla Platform, JavaScript and Files The Mozilla Platform is the application development framework behind Firefox, Thunderbird, Instantbird, Camino, Songbird and a number of other applications. While the performance-critical components of the Mozilla Platform are developed in C/C++, an increasing number o...
JavaScript,File,Local file,Firfox,Mozilla 2011-12-06 09:05:48
Python threads: communication and stopping
A very common doubt developers new to Python have is how to use its threads correctly. Specifically, a large amount of questions on StackOverflow show that people struggle most with two aspects: How to stop / kill a threadHow to safely pass data to a thread and back I already have a blog post touching on these issues right here, but I feel it’s too task-specific for sockets, and a more basic and general post would be appropriate. I assume the reader has a basic familiarity with Pytho...
Python,Multithreading,Communication,Synchronize 2011-12-28 07:38:32
How to read Haskell like Python
Have you ever been in the situation where you need to quickly understand what a piece of code in some unfamiliar language does? If the language looks a lot like what you’re comfortable with, you can usually guess what large amounts of the code does; even if you may not be completely familiar how all the language features work.For Haskell, this is a little more difficult, since Haskell syntax looks very different from traditional languages. But there's no really deep difference here; you j...
Haskell,Python,Format,Like,Similarity 2011-11-15 08:45:39
Valid JavaScript variable names
Did you know var π = Math.PI; is syntactically valid JavaScript? I thought this was pretty cool, so I decided to look into which Unicode glyphs are allowed in JavaScript variable names, or identifiers as the ECMAScript specification calls them. Reserved words The ECMAScript 5.1 spec says: An Identifier is an IdentifierName that is not a ReservedWord. The spec describes four groups of reserved words: keywords, future reserved words, null literals and boolean lite...
JavaScript,Name convention,Standard 2012-02-22 05:16:53
CSS3 & HTML5 Support in Browsers
Last week we launched FindMeByIP.com, a simple app which reveals your browsers' support for CSS3 and HTML5 features in an easy to read format using Modernizr.We've had a great response and we're going to be implementing some of your feedbackin the near future.UPDATE: Check out our Web Designers' HTML5 & CSS3 ChecklistFor now though I thought people mind find it useful to know the state of support in the current browser market. I've taken all the A-Gra...
CSS,HTML5,Web browser,Support 2011-05-14 11:26:45
Code coverage rate
When doing unit testing, the code coverage rate is often used as the criteria for measuring testing performance, even in some cases code coverage may be used to consider whether the testing task is completed or not. So testers need to spend much time on designing test cases which can cover as many codes as possible. There are advantages and disadvantages about using code coverage rate. First let's check what is code coverage rate: code coverage rate= the degree of code coverage in testing. There...
Unit testing,Code coverage 2013-04-16 12:50:57
Tricks with Direct Memory Access in Java
Java was initially designed as a safe managed environment. Nevertheless, Java HotSpot VM contains a “backdoor†that provides a number of low-level operations to manipulate memory and threads directly. This backdoor – sun.misc.Unsafe – is widely used by JDK itself in packages like java.nio or java.util.concurrent. It is hard to imagine a Java developer that uses this backdoor in any regular development because this API is extremely dangerous...
Java,Directly memory access,Tricks,JVM 2012-02-13 05:31:19
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