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What are Long-Polling, Websockets, Server-Sent Events (SSE) and Comet?
I have tried reading some articles, but I am not very clear on the concepts yet.
4 Answers
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What is Java Servlet?
I read many articles to understand java servlet but I did not succeed.
12 Answers
12
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How to call an external command?
...ocess.Popen("echo Hello World", shell=True, stdout=subprocess.PIPE).stdout.read()
instead of:
print os.popen("echo Hello World").read()
but it is nice to have all of the options there in one unified class instead of 4 different popen functions. See the documentation.
The call function from th...
Concurrent HashSet in .NET Framework?
...ng, byte> _data;
This is the recommended option because the type is thread-safe and provide you the same advantages than a HashSet<T> except key and value are different objects.
Source: Social MSDN
ConcurrentBag
If you don't mind about the duplicate entries, you can use the class Concu...
How do I import other TypeScript files?
...s files so everything I need is there. But I see what you need and you can read more about that here: typescriptlang.org/Content/… at page 75 (chapter 9). Btw it worth reading the whole specification, it's relatively short compared to other languages.
– Peter Porfy
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Java FileReader encoding issue
I tried to use java.io.FileReader to read some text files and convert them into a string, but I found the result is wrongly encoded and not readable at all.
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Maven: Non-resolvable parent POM
...s means you cannot resolve the parent repo.
Trun on debug mode:
[DEBUG] Reading global settings from **/usr/local/Cellar/maven/3.5.4/libexec/conf/settings.xml**
[DEBUG] **Reading user settings from /Users/username/.m2/settings.xml**
[DEBUG] Reading global toolchains from /usr/local/Cellar/maven/3...
Android: Getting a file URI from a content URI?
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Actually, I just re-read the docs for getContentResolver().openInputStream(), and it works automatically for schemes of "content" or "file", so you don't need to check the scheme... if you can safely assume that it's always going to be content:/...
COUNT DISTINCT with CONDITIONS
... be included in count.
One thing to note here is that this can be done by reading the table once. When it seems that you have to read the same table twice or more, it can actually be done by reading once, in most of the time. As a result, it will finish the task a lot faster with less I/O.
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Why use String.Format? [duplicate]
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I can see a number of reasons:
Readability
string s = string.Format("Hey, {0} it is the {1}st day of {2}. I feel {3}!", _name, _day, _month, _feeling);
vs:
string s = "Hey," + _name + " it is the " + _day + "st day of " + _month + ". I feel " + feeli...