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MQTT物联网协议完全实践指南 · App Inventor 2 中文网
... 消息流
应用场景
网络开销
QoS 0
最多一次
PUBLISH → Broker → Subscriber
传感器数据、温度读数
最低
QoS 1
至少一次
PUBLISH → PUBACK → PUBLISH → PUBACK
控制指令、报...
How to find which rspec test is taking so long
...rofile flag or add --profile to your .rspec file. This will track the top 10 slowest examples.
For RSpec 1, you can use --format o with spec command. It shows a text-based progress bar with profiling of 10 slowest examples. For more details see this.
rspec --profile -- path/to/file/spec.rb
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Greenlet Vs. Threads
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208
Greenlets provide concurrency but not parallelism. Concurrency is when code can run independent...
How to read environment variables in Scala
...2.9 you can use sys.env for the same effect:
scala> sys.env("HOME")
res0: String = /home/paradigmatic
I think is nice to use the Scala API instead of Java. There are currently several project to compile Scala to other platforms than JVM (.NET, javascript, native, etc.) Reducing the dependencie...
How to print something without a new line in ruby
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Sergio TulentsevSergio Tulentsev
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Is there a common Java utility to break a list into batches?
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edited Jul 13 '16 at 1:02
Mando Escamilla
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answ...
Git fast forward VS no fast forward merge
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Mark
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answered Jul 14 '11 at 23:55
Ivan DanilovIvan Danilov
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Rails hidden field undefined method 'merge' error
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edited Sep 15 '14 at 9:01
answered Jul 9 '11 at 19:10
ap...
Android Fragments: When to use hide/show or add/remove/replace?
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answered Nov 1 '12 at 20:32
David C. Sainte-ClaireDavid C. Sainte-Claire
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error: Libtool library used but 'LIBTOOL' is undefined
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edited Mar 10 at 21:02
S.S. Anne
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a...