blocks|key|3301714|text|绿地|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3301715|3301716|在软件工程等其他学科中，绿地也是缺乏先前工作施加的任何约束的项目。这个比喻是在绿地上建造，在那里不需要重新改造或拆卸现有的结构。|blockquote|3301717|3301718|3301719|(来自http://en.wikipedia.org/wiki/Greenfield_project)|offset|length|3301720|棕地|3301721|3301722|+Brownfield开发是IT行业中常用的术语，用于描述在现有(遗留)软件应用程序/系统直接存在的情况下需要开发和部署新软件系统的问题空间。这意味着任何新的软件架构都必须考虑到并与已经存在的实时软件共存。|3301723|3301724|3301725|(来自http://en.wikipedia.org/wiki/Brownfield_(software_development)|3301726|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Greenfield_project|1|http://en.wikipedia.org/wiki/Brownfield_(software_development%2529)^0|0|0|0|0|0|3|1B|0|0|0|0|0|0|0|3|1Q|1|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|15|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|16|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|17|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|18|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|19|8|@]|9|@$J|1A|K|1B|1|1C]]|A|$]]|$1|L|3|M|5|6|7|1D|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|O|3|P|5|E|7|1F|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1I|8|@]|9|@$J|1J|K|1K|1|1L]]|A|$]]|$1|U|3|-4|5|6|7|1M|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11]]|12|$5|X|Y|Z|A|$10|13]]]]

<h3>Greenfield</h3>

<blockquote>
 in other disciplines like software engineering, a greenfield is also a project which lacks any constraints imposed by prior work. The analogy is to that of construction on greenfield land where there is no need to remodel or demolish an existing structure.
</blockquote>

(from <a href="http://en.wikipedia.org/wiki/Greenfield_project" rel="noreferrer">http://en.wikipedia.org/wiki/Greenfield_project</a>)

<h3>Brownfield</h3>

<blockquote>
 Brownfield development is a term commonly used in the IT industry to describe problem spaces needing the development and deployment of new software systems in the immediate presence of existing (legacy) software applications/systems. This implies that any new software architecture must take into account and coexist with live software already in situ.
</blockquote>

(from <a href="http://en.wikipedia.org/wiki/Brownfield_(software_development)" rel="noreferrer">http://en.wikipedia.org/wiki/Brownfield_(software_development)</a>)

blocks|key|330766|text|我认为这可能与城市规划术语"greenfield+land"和"brownfield+land"有关。绿地是未开发的土地-农业，景观，或自然。棕地是已开发的土地。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|330767|brownfield应用程序是现有的应用程序，而greenfield应用程序是尚未开发或处于非常早期开发阶段的应用程序。|330768|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Greenfield_land|1|http://en.wikipedia.org/wiki/Brownfield_land^0|D|H|0|V|H|1|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]|$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

I think it might be related to the urban planning terms <a href="http://en.wikipedia.org/wiki/Greenfield_land" rel="noreferrer">"greenfield land"</a> and <a href="http://en.wikipedia.org/wiki/Brownfield_land" rel="noreferrer">"brownfield land"</a>. Greenfield land is undeveloped land - agricultural, landscaping, or natural. Brownfield land is developed land.

A brownfield application is an existing application, while a greenfield application is one that is not yet made or is in very early stages of development.

blocks|key|328165|text|Greenfield应用程序:新的开发，之前没有对您的解决方案构成限制的工作。我想这个词来自于“未开耕的绿色”领域。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|328166|Brownfield:现有的应用程序，很多现有的东西需要考虑，等等。|328167|See+this+post。|offset|length|328168|entityMap|0|LINK|mutability|MUTABLE|url|http://footheory.com/blogs/donnfelker/archive/2008/05/05/software-development-greeenfield-vs-brownfield.aspx^0|0|0|0|D|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

Greenfield apps: new development, no prior work done that poses constraints on your solution. I think the term comes from un "unplowed, green" field.

Brownfield: existing application, lots of existing stuff to consider, etc. 

<a href="http://footheory.com/blogs/donnfelker/archive/2008/05/05/software-development-greeenfield-vs-brownfield.aspx" rel="noreferrer">See this post</a>.

blocks|key|3088678|text|我猜这是对建筑的类比|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3088679|3088680|a+greenfield+site是处女地-即一个新项目，从头开始一个新的软件项目|unordered-list-item|offset|length|3088681|a+brownfield+site是一个需要首先拆除现有结构的站点，即在现有软件项目|3088682|中构建|3088683|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Greenfield%255Fland|1|http://en.wikipedia.org/wiki/Brownfield_land^0|0|0|2|A|0|0|2|A|1|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|W|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|X|8|@]|9|@$F|Y|G|Z|1|10]]|A|$]]|$1|H|3|I|5|E|7|11|8|@]|9|@$F|12|G|13|1|14]]|A|$]]|$1|J|3|K|5|6|7|15|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]|T|$5|O|P|Q|A|$R|U]]]]

I would guess it's an analogy to building

<ul>
<li>a <a href="http://en.wikipedia.org/wiki/Greenfield%5Fland" rel="nofollow noreferrer">greenfield</a> site is virgin ground - i.e. a new project, starting a new software project from scratch</li>
<li>a <a href="http://en.wikipedia.org/wiki/Brownfield_land" rel="nofollow noreferrer">brownfield</a> site is one where existing structures need to dismantled first, i.e. building within an existing software project</li>
</ul>

blocks|key|3088754|text|根据我对James+Gregory+(+Fluent+NHibernate背后的人)的了解，我认为维基百科上关于brownfield的词条有点理想化。在Brownfield+Application+Development中，我们将其定义为：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3088755|3088756|以前创建的项目或代码库，可能会被糟糕的实践、结构和设计所污染，但有可能通过全面和定向的重构而复兴|blockquote|3088757|3088758|3088759|简而言之:需要工作但仍在积极开发的现有项目(与大多数遗留系统不同)。|3088760|entityMap|0|LINK|mutability|MUTABLE|url|http://manning.com/baley^0|24|Y|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|D|3|-4|5|6|7|X|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|Y|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|Z|8|@]|9|@]|C|$]]|$1|I|3|-4|5|6|7|10|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|11|8|@]|9|@]|C|$]]|$1|L|3|-4|5|6|7|12|8|@]|9|@]|C|$]]]|M|$N|$5|O|P|Q|C|$R|S]]]]

Based on what I know of James Gregory (the guy behind Fluent NHibernate), I think the Wikipedia entry for brownfield is a little on the theoretical side. In <a href="http://manning.com/baley" rel="nofollow noreferrer">Brownfield Application Development</a>, we define it as:

<blockquote>
 a project, or codebase, that was
 previously created and may be
 contaminated by poor practices,
 structure, and design but has the
 potential to be revived through
 comprehensive and directed refactoring
</blockquote>

Short version: An existing project that needs work but is still actively developed (unlike most legacy systems).

blocks|key|328199|text|围绕着公司是“绿地”还是“棕地”还是重构遗留代码的决定，有很多争论。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|328200|这一决定需要考虑到许多因素-尤其是可用于开发绿地应用程序的资金。在许多情况下，遗留应用程序是公司目前的摇钱树，在完全开发并掌握在第一个付费客户手中之前，任何对遗留代码的绿地替换都不会赚到一分钱。|328201|虽然大多数软件工程师的偏好是启动新的GREENFIELD项目，因为他们通常讨厌OPC+(其他人的代码)，但这可能并不总是公司的长期财务状况。|328202|我写了一篇文章，分析了绿地项目涉及的风险，基于多年前我在20%2B工作的一家公司的非常真实的经验(显示我现在的年龄;)。你可以在这里阅读：|328203|http://stepaheadsoftware.blogspot.com.au/2012/09/greenfield-or-refactor-legacy-code-base.html|offset|length|328204|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|0|2L|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|U|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|V|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|W|8|@]|9|@$J|X|K|Y|1|Z]]|A|$]]|$1|L|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|I]]]]

There is much debate surrounding a company's decision to 'greenfield' or 'brownfield' or refactor legacy code.

The decision needs to be made in consideration of many factors - not the least being the available funds to develop a greenfield application. In many cases the legacy app is the company's current cash cow and any greenfield replacement of that legacy code won't make a single red dollar until it is has been fully developed and in the hands of the first paying customer.

While the preference for most software engineers is START NEW GREENFIELD PROJECT because they usually hate OPC (Other People's Code) it may not always be in the long term financial of the company.

I wrote an article that analyses the risks involved with greenfield projects basing it on a very real experience at a company I worked for 20+ years ago (showing my age now ;). You can read it here:

<a href="http://stepaheadsoftware.blogspot.com.au/2012/09/greenfield-or-refactor-legacy-code-base.html" rel="nofollow">http://stepaheadsoftware.blogspot.com.au/2012/09/greenfield-or-refactor-legacy-code-base.html</a>

I read the following sentence in the <a href="http://wiki.fluentnhibernate.org/Auto_mapping" rel="noreferrer">Fluent NHibernate wiki</a>:

<blockquote>
 ...; however, for most greenfield applications (and quite a few brownfield ones too) auto mapping will be more than capable.
</blockquote>

What are greenfield and brownfield applications?

What are greenfield and brownfield applications?

软件工程

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我在中读到了下面这句话 ...；然而，对于大多数绿地应用程序(以及相当多的棕地应用程序)，自动映射的能力将会更强。什么是绿地和棕地应用程序？

问什么是绿地和棕地应用程序？
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