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How to make ThreadPoolExecutor's submit() method block if it is saturated?
...eate a ThreadPoolExecutor such that when it has reached its maximum size and the queue is full, the submit() method blocks when trying to add new tasks. Do I need to implement a custom RejectedExecutionHandler for that or is there an existing way to do this using a standard Java library?
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printf with std::string?
My understanding is that string is a member of the std namespace, so why does the following occur?
7 Answers
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What is the difference between pluck and collect in Rails?
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Yes. According to Rails guides, pluck directly converts a database result into an array, without constructing ActiveRecord objects. This means better performance for a large or often-running query.
In addition to @apneadiving's answer, pluck can take both single and mult...
Program only crashes as release build — how to debug?
...t a program nonetheless) is crashing, but only when built in release mode, and only when launched from the command line. Through caveman debugging (ie, nasty printf() messages all over the place), I have determined the test method where the code is crashing, though unfortunately the actual crash se...
What is the maximum float in Python?
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Cool, both are very useful. inf for all things python, and float_info.max as a workaround when the earlier doesn't work, for example time.sleep(float("inf")) is not allowed :(
– Dima Tisnek
Oct 20 '16 at 11:27
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What does the [Flags] Enum Attribute mean in C#?
...t expect in bitwise operations, because by default the values start with 0 and increment.
Incorrect declaration:
[Flags]
public enum MyColors
{
Yellow, // 0
Green, // 1
Red, // 2
Blue // 3
}
The values, if declared this way, will be Yellow = 0, Green = 1, Red = 2, Blu...
How to initialize HashSet values by construction?
...;
Again, this is not time efficient since you are constructing an array, converting to a list and using that list to create a set.
When initializing static final sets I usually write it like this:
public static final String[] SET_VALUES = new String[] { "a", "b" };
public static final Set<Str...
How can I time a code segment for testing performance with Pythons timeit?
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You can use time.time() or time.clock() before and after the block you want to time.
import time
t0 = time.time()
code_block
t1 = time.time()
total = t1-t0
This method is not as exact as timeit (it does not average several runs) but it is straightforward.
time.time...
Using Emacs as an IDE
...tangle functions can be really useful for taking a dump from some tool and converting it to useful data such as an elisp program or a comma delimited spreadsheet.
I wrote a page about IDE like things you can do with emacs
http://justinsboringpage.blogspot.com/2007/09/11-visual-studio-tricks-in-e...
How do I read configuration settings from Symfony2 config.yml?
... the first approach and the documentation, it's that the config values are converted into parameters in the MyNiceProjectExtension->load() method with this line: $container->setParameter( 'my_nice_project.contact_email', $processedConfig[ 'contact_email' ]);. Thanks Xavi!
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