Zeromq

AOSA即《The Architecture of Open Source Application》是本不错的书，这本书的写成本本身也采源了开源社区的协作方式，目前已经出了两部，最新的版本为POSA即《The Performance of Open Source Application》，专注于开源软件的性能。 最近抽时间看了AOSA中关于ZeroMQ的章节，自己先前由于工作需求，简单了解到过ZeroMQ，这次可以借机会读读ZeroMQ创始人亲自写的章节，确实有不少的收获，记录在这里，在后续的项目实践中可以予以参考使用。 Library设计 The lesson here is pretty obvious: Don’t use global state in libraries. If you do, the library is likely to break when it happens to be instantiated twice in the same process. ZeroMQ设计时经过分析和对比，最终采用了Library而非单一的消息服务器的方案，在设计Library时，得出了上述结论。 也即对于Library而言，最好避免全局状态，采用Context的方式较好，特别是存在library被额外的library依赖在同一程序中存在多份library实例时可以避免带来的竞争性问题。 了解真正的问题 There are many more pitfalls in benchmarking the messaging systems that we won’t go further into. The stress should rather be placed on the lesson learned: Make sure you understand the problem you are solving. Even a problem as simple as “make it fast” can take lot of work to understand properly. What’s more, if you don’t understand the problem, you are likely to build implicit assumptions and popular myths into your code, making the solution either flawed or at least much more complex or much less useful than it could possibly be. ...