Concurrency and Application Design In the early days of computing, the maximum amount of work per unit of time that a computer could perform was determined by the clock speed of the CPU. But as technology advanced and processor designs became more co…

Operation Queues operation object是 NSOperation class实例用来封装想要执行的任务.nsoperation class是抽象类必须子类化. NSInvocation-Operation类用来创建基于应用程序对象和selector的operation object.这个不需要子类话可以动态创建. NSBlockOperation类可以并发执行一个或者多个block对象.直到所有的block都执行完毕这个operation才算完成了. NSOperat…

Dispatch Queues dispatch queues 是基于c机制的一系列自定义任务操作.遵循先进先出的规则.每次只执行一个任务,直到上个任务完成才执行新的任务.相反的,并发的dispatch queue可以启动多个任务而不用等待其他任务执行完成. 提交给dispatch queue的任务必须是封装好的方法或者block 对象.dispatch queue是gcd技术的一部分. Dispatch Sources dispatch sources是基于c机制的异步系统事件.一个dispa…

在计算机发展的早期,单位工作时间的最高限额是一台计算机可以执行通过CPU的时钟速度确定.但是,随着技术的进步和处理器设计变得更紧凑,热等物理约束开始限制处理器的最高时钟速度.因此,芯片制造商寻找其它的方法来提高其芯片的整体性能.该解决方案是它们增加每个芯片上的处理器核的数量.通过增加核的数量,在单个芯片可以在不增加CPU速度或改变每秒执行更多的指令芯片尺寸和热特性.唯一的问题是如何利用其他核. 脱离线程 虽然线程已经存在了很多年,继续有其用途,他们不解决在一个可扩展的方式执行多个任务的普遍问题.…

https://github.com/mspnp/azure-guidance https://github.com/mspnp/performance-optimization https://github.com/mspnp/data-pipeline Cloud Design Patterns: Prescriptive Architecture Guidance for Cloud Applications https://msdn.microsoft.com/en-us/library…

以下翻译是本人通过谷歌工具进行翻译,并进行修正后的结果,希望能对大家有所帮助.如果您发现翻译的不正确不合适的地方,希望您能够发表评论指正,谢谢.转载请注明出处. Concurrency and Application Design 并发和程序设计 In the early days of computing, the maximum amount of work per unit of time that a computer could perform was determined by th…

thread用来表述执行代码的独立path.os x的线程执行基于POSIX 线程API. process用来表述一个运行操作,可以包含多个线程. task用来描述工作的抽象概念. Concurrency and Application Design  不是依赖threads,os x和ios使用的是asynchronous design approach来解决并发的问题.异步函数在操作系统中已经使用多年用来初始化可能需要花费大量时间的task,比如从disk读取数据.当被调用的时候,异步函数会…

著作权归作者所有.商业转载请联系作者获得授权,非商业转载请注明出处.作者:Wang Hailong链接:https://www.zhihu.com/question/20016551/answer/13680483来源:知乎 关于iOS开发的学习 打个比方就像把汽车分解 最底层的原料有塑料 钢铁 再用这些底层的东西造出来发动机 座椅 最后再加上写螺丝 胶水等 把汽车就拼起来了 iOS基本都是英文的资料 也由于封闭 文档写的相当好在遇到新框架的时候 弄明白框架的功能 去文档里搜搜 框架的 Prog…

A Pattern Language for Parallel Application Programming Berna L. Massingill, Timothy G. Mattson, Beverly A. Sanders Abstract Parallel computing has failed to attract significant numbers of programmers outside the specialized world of supercomputing.…

pingback :http://java.sys-con.com/node/84633?page=0,1 Object-oriented design is like an alloy consisting of a solid grounding in the object-oriented (OO) approach and implementing the best OO practices heavily laced with how to sidestep the OO pitfal…

原文地址:http://www.infoq.com/articles/ddd-in-practice Background Domain Driven Design (DDD) is about mapping business domain concepts into software artifacts. Most of the writings and articles on this topic have been based on Eric Evans' book "Domain Dr…

About creating web GIS applications As you learn and use ArcGIS for Server, you'll probably reach the point where you want to build or customize your own web application to work with your GIS services. Esri offers several resources that you can use t…

f you run notepad elevated (Right click | Run as Administrator), and you try and drag-and-drop a file from Windows Explorer, nothing happens. It looks like it is going to work because the pointer icon changes but the file doesn’t open. Weird, huh? Wh…

Application Programs 应用程序 If you're building an application programsuch as a document editor or spreadsheet, then internal reuse, maintainability, andextension are high priorities. Internal reuse ensures that you don't design andimplement any more th…

A modular application is an application that is divided into a set of loosely coupled functional units (named modules) that can be integrated into a larger application. A client module encapsulates a portion of the application's overall functionality…

Dev 401-002:Application Essentials:Designing Application on the Force.com Platform Course Objectives1.Describe the type of application best suited for the Force.com platform.2.Describe the feature of the Force.com platform that help you build your da…

[it-ebooks]电子书列表   [2014]: Learning Objective-C by Developing iPhone Games || Leverage Xcode and Objective-C to develop iPhone games http://it-ebooks.info/book/3544/Learning Web App Development || Build Quickly with Proven JavaScript Techniques http:…

RAC: Frequently Asked Questions [ID 220970.1]   修改时间 13-JAN-2011     类型 FAQ     状态 PUBLISHED   Applies to: Oracle Server - Enterprise Edition - Version: 9.2.0.1 to 11.2.0.1 - Release: 9.2 to 11.2 Purpose Frequently Asked Questions for Real Applicatio…

http://www.onjava.com/pub/a/onjava/2001/05/30/optimization.htmlComparing the performance of LinkedLists and ArrayLists (and Vectors) (Page last updated May 2001, Added 2001-06-18, Author Jack Shirazi, Publisher OnJava). Tips: ArrayList is faster than…

典型的不好的设计: 破坏了系统的可扩展性(韧性) Applications requiring significant concurrency management as user populations increase Increased locking activities Increased data consistency workload Increased operating system workload Transactions requiring increases in d…

http://devs.cloudimmunity.com/gotchas-and-common-mistakes-in-go-golang/ 50 Shades of Go: Traps, Gotchas, and Common Mistakes for New Golang Devs Go is a simple and fun language, but, like any other language, it has a few gotchas... Many of those gotc…

英文投稿的一点经验[转载] From: http://chl033.woku.com/article/2893317.html 1. 首先一定要注意杂志的发表范围, 超出范围的千万别投,要不就是浪费时间;另外,每个杂志都有他们的具体格式要求,一定要按照他们的要求把论文写好,免得浪费时间,前些时候,我的一个同事向一个著名的英文杂志投稿,由于格式问题,人家过两个星期就退回来了,而且说了很多难听的话,说投稿前首先就应该看清楚他们的格式要求:2. 论文写作一定要言简意赅,特别是摘要,引言和结论部分,特别…

http://blog.csdn.net/win_lin/article/details/8242653 译文在后面. State Threads for Internet Applications Introduction State Threads is an application library which provides a foundation for writing fast and highly scalable Internet Applications on UNIX-li…

1. Access method(访问方法):此步骤包括从文件中存储和检索记录. 2. Alias(别名):某属性的另一个名字.在SQL中,可以用别名替换表名. 3. Alternate keys(备用键,ER/关系模型):在实体/表中没有被选为主健的候选键. 4. Anomalies(异常)参见更新异常(update anomalies) 5. Application design(应用程序设计):数据库应用程序生命周期的一个阶段,包括设计用户界面以及使用和处理数据库的应用程序. 6. Att…

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Introduction to Java EE Gain an understanding of the Java Platform, Enterprise Edition (Java EE) Examine the Java EE application architecture Examine Java EE container services Examine the EJB component types Evaluate the EJB Lite Container Compare J…

https://github.com/onurakpolat/awesome-bigdata A curated list of awesome big data frameworks, resources and other awesomeness. Inspired by awesome-php, awesome-python, awesome-ruby, hadoopecosystemtable & big-data. Your contributions are always welco…

Oracle Real Application Clusters (RAC) databases form an increasing proportion of Oracle database systems. RAC was introduced in 2001 as part of Oracle 9i and was based on Oracle's earlier Oracle Parallel Server architecture. RAC is almost unique as…

Open source software has become a fundamental building block for some of the biggest websites. And as those websites have grown, best practices and guiding principles around their architectures have emerged. This chapter seeks to cover some of the ke…

译文在后面. State Threads for Internet Applications Introduction State Threads is an application library which provides a foundation for writing fast and highly scalable Internet Applications on UNIX-like platforms. It combines the simplicity of the multi…