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App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
...质量等级会有额外的开销，一般用于安全性、可靠性要求高的场景，比如支付。
RetainFlag：保留消息
保留消息定义：如果PUBLISH消息的RETAIN标记位被设置为1，则称该消息为“保留消息”。
Broker对保留消息的处理：...
How do I fix the Visual Studio compile error, “mismatch between processor architecture”?
...rying to warn you when you state that your project is compatible with "Any CPU" but you have a dependency on a project or .dll assembly that is either x86 or x64. Because you have an x86 dependency, technically your project is therefore not "Any CPU" compatible. To make the warning go away, you shou...
How do I return multiple values from a function? [closed]
...g (or too simplistic).
Returning a dictionary with keys "y0", "y1", "y2", etc. doesn't offer any advantage over tuples. Returning a ReturnValue instance with properties .y0, .y1, .y2, etc. doesn't offer any advantage over tuples either. You need to start naming things if you want to get anywhere, a...
How to make the 'cut' command treat same sequental delimiters as one?
... for parsing files where the separator is not whitespace (for example /etc/passwd) and that have a fixed number of fields. Two separators in a row mean an empty field, and that goes for whitespace too.
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分布式系统的事务处理 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...一台服务器来提供数据服务的时候，我会遇到如下的两个问题：1）一台服务器的性能不足以提供足够的能力服务于所有的网络...当我们在生产线上用一台服务器来提供数据服务的时候，我会遇到如下的两个问题：
1）一台服务...
What is thread contention?
... or more threads over a shared resource. Resource can be a lock, a counter etc. Competition means "who gets it first". The more threads the more contention. The more frequent access to a resource the more contention.
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What is the iPad user agent?
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Mozilla/5.0(iPad; U; CPU iPhone OS 3_2 like Mac OS X; en-us) AppleWebKit/531.21.10 (KHTML, like Gecko) Version/4.0.4 Mobile/7B314 Safari/531.21.10
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PHP操作MongoDB时的整数问题及对策 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
PHP操作MongoDB时的整数问题及对策本文所说的整数问题，其实并不是MongoDB的问题，而是PHP驱动的问题：MongoDB本身有两种整数类型，分别是：32位整数和64位整数，但旧版的PHP...本文所说的整数问题，其实并不是MongoDB的问题，而是P...
Why does Android use Java? [closed]
...ill be exploitable themselves. No buffer-overruns, mistakes with pointers, etc...
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Node.js on multi-core machines
...pling between processes, have more sophisticated load-balancing decisions, etc.), but it is definitely more work to set up and the built-in cluster module is a low-complexity alternative that works for most people.
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