block | 易学教程

Nginx模块开发入门

阅读更多关于 Nginx模块开发入门

前言 Nginx是当前最流行的HTTP Server之一，根据W3Techs的统计，目前世界排名（根据Alexa）前100万的网站中， Nginx的占有率为6.8% 。与Apache相比， Nginx在高并发情况下具有巨大的性能优势。 Nginx属于典型的微内核设计，其内核非常简洁和优雅，同时具有非常高的可扩展性。Nginx最初仅仅主要被用于做反向代理，后来随着HTTP核心的成熟和各种HTTP扩展模块的丰富，Nginx越来越多被用来取代Apache而单独承担HTTP Server的责任，例如目前淘宝内各个部门正越来越多使用Nginx取代Apache，据笔者了解，在腾讯和新浪等公司也存在类似情况。同时，大量的第三方扩展模块也令Nginx越来越强大。例如，由淘宝的工程师清无（王晓哲）和春来（章亦春）所开发的 nginx_lua_module 可以将Lua语言嵌入到Nginx配置中，从而利用Lua极大增强了Nginx本身的编程能力，甚至可以不用配合其它脚本语言（如PHP或Python等），只靠Nginx本身就可以实现复杂业务的处理。而春来所开发的 ngx_openresty 更是通过集成 LuaJIT 等组件，将Nginx本身变成了一个完全的应用开发平台。目前淘宝数据平台与产品部量子统计的产品都是基于ngx_openresty所开发。对ngxin_lua_module或ngx

Golang http server blocks when starts a goroutine of infinite-loop

阅读更多关于 Golang http server blocks when starts a goroutine of infinite-loop

问题 As i learned from golang docs, if i set runtime.GOMAXPROCS(8) with a cpu of 8 cores (intel i7), then start a goroutine of infinite-loop, other gorutines should not be blocked because there are engough threads and goprocs. But this is not true when using net/http package, an infinite-loop goroutine will block http server after a few invocations. Can anyone help to explain why ? If i comment the line of "go infinite loop", start client after server, client will output 1000 asterisks; but if i

How do I create an objective-c method that return a block

阅读更多关于 How do I create an objective-c method that return a block

问题 -(NSMutableArray *)sortArrayByProminent:(NSArray *)arrayObject { NSArray * array = [arrayObject sortedArrayUsingComparator:^(id obj1, id obj2) { Business * objj1=obj1; Business * objj2=obj2; NSUInteger prom1=[objj1 .prominent intValue]; NSUInteger prom2=[objj2 .prominent intValue]; if (prom1 > prom2) { return NSOrderedAscending; } if (prom1 < prom2) { return NSOrderedDescending; } return NSOrderedSame; }]; NSMutableArray *arrayHasBeenSorted = [NSMutableArray arrayWithArray:array]; return

block syntax difference causes “LocalJumpError: no block given (yield)” [duplicate]

阅读更多关于 block syntax difference causes “LocalJumpError: no block given (yield)” [duplicate]

问题 This question already has answers here : Code block passed to each works with brackets but not with 'do'-'end' (ruby) (3 answers) Closed 5 years ago . Saw a strange case come up, trying to figure out what is happening here: > def test > p yield > end => nil > test { 1 } 1 => 1 > p test { 1 } 1 1 => 1 > p test do > 1 > end LocalJumpError: no block given (yield) 回答1: The parser recognizes this p test do 1 end as this (p test) do 1 end The block is passed to p , not test . Therefore, yield can't

Weird imoperfection in Ruby blocks [duplicate]

阅读更多关于 Weird imoperfection in Ruby blocks [duplicate]

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: What is the difference or value of these block coding styles in Ruby? # This works method :argument do other_method end # This does not method :argument { other_method } Why? It seems like the interpreter is confused and thinks that the { ... } is a hash. I always get angry when an interpreter can't understand a code that is actually valid. It resembles PHP that had many problems of this kind. 回答1: It doesn't

Cast closures/blocks

阅读更多关于 Cast closures/blocks

问题 In Objective-C, I often pass around blocks. I use them very often to implement patterns that help avoid storing stuff into instance variables, thus avoiding threading/timing issues. For example, I assign them to a CAAnimation via -[CAAnimation setValue:forKey:] so I can execute the block when the animation is finished. (Objective-C can treat blocks as objects; you also can do [someBlock copy] and [someBlock release] .) However, trying to use these patterns in Swift together with Objective-C

Linux: Block until a string is matched in a file (“tail + grep with blocking”)

阅读更多关于 Linux: Block until a string is matched in a file (“tail + grep with blocking”)

问题 Is there some one-line way in bash/GNU tools to block until there's a string matched in a file? Ideally, with timeout. I want to avoid multi-line loop. Update: Seems like I should have emphasize that I want the process to end when the string is matched. 回答1: Thanks both for answers, but the important part was that the process blocks until found, then ends. I found this: grep -q 'PATTERN' <(tail -f file.log) -q is not much portable, but I will only use Red Hat Enterprise Linux so it's ok. And

iOS Name of this way of building and returning an object in Objective-C

阅读更多关于 iOS Name of this way of building and returning an object in Objective-C

问题 I'm trying to find out what this style of coding is called, is it an inline block? inline scope? what? What will the compiler create when it comes across one of these... - (UIView *)createMyView { return ({ UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 0)]; /* set some stuff up on the view;  */ view;  }); } I'm asking because we're getting a lot of cxx_destruct calls in a crash log with lines numbers that are way bigger than the actual size of the file. I'm wondering if

Chrome extension: Block page items before access

阅读更多关于 Chrome extension: Block page items before access

问题 I am trying to do block items on a webpage but I want to do that, before they are loaded. So, e.g., I could use chrome.webRequest.onBeforeRequest.addListener(...); And redirect/cancel the request. But i want to inspect the actual content of the request. What I am doing right now, is starting a XMLHttpRequest to load the url/object myself, inspect the content, and block it if necessary. However, the main problem is that in fact, not many objects are blocked. This means, that each object is

Understanding Magento Block and Block Type

阅读更多关于 Understanding Magento Block and Block Type

问题 I just want to understand the meaning of <block type="page/html" name="root" output="toHtml" template="example/view.phtml"> I got many references from Google and understood many things about it but I am still unable to understand the formation of type="page/html" how to form a type for my custom module. Please explain type="A/B" Let me know where this A and B come from? 回答1: The A is a module's alias . In this case page is short for Mage_Page_Block (it is defined in app/code/core/Mage/Page