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multithreading - Python time.sleep() vs event.wait()

I want to perform an action at a regular interval in my multi-threaded Python application. I have seen two ... full delay while shutting down) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to define unidirectional OneToMany relationship in JPA

I have a following problem with entity mapping in JPA. I have two entities, first one is Lookup and the second ... if there is some other way? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How does the billion laughs XML DoS attack work?

<!DOCTYPE root [ <!ENTITY ha "Ha !"> <!ENTITY ha2 "&ha; &ha;"> <!ENTITY ha3 "&ha2; &ha2;"> <! ... DoS attack. does anyone know how it works? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Is Number.IsNaN() more broken than isNaN()

Soooooo isNaN is apparently broken in JavaScript, with things like: isNaN('') isNaN(' ') isNaN(true) isNaN ... understanding the point of isNaN? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How to download dependencies in gradle

I have a custom compile task. task compileSpeedTest(type: JavaCompile) { classpath = files('build') source = ... add it on list dependsOn. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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In what scenarios does freezing WPF objects benefit performance greatly?

Many types in WPF derive from Freezable. It provides immutability to mutable POCO objects and, apparently, ... but different question too) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ios - MKMapView MKPointAnnotation tap event

I have a list of annotations (MKPointAnnotation). I have a UIViewController which is for the whole view, MKMapView ... Sorry for all the fuss! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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json - Very large HTTP request vs many small requests

I need a 2D array (as Json) to be sent from server to client. It would be around 400x400 in size with ... request size for this data? Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Why do we have to call super in Android sometimes?

Sometimes when I override methods, I get an exception the first time it's called like below: 05-31 21:32:04. ... than waiting for it to crash? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Content-Length header versus chunked encoding

I'm trying to weigh the pros and cons of setting the Content-Length HTTP header versus using chunked encoding to ... may not have thought of? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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r - data.table and parallel computing

Following this post: multicore and data.table in R, I was wondering if there was a way to use all cores ... allows such operations by design. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android - Make new activity appear behind old one during transition

What I'm trying to achieve is to override the start activity animation. The animation should give the ... achieved using the framework? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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node.js - socket.io and express 4 sessions

I would like to access the express 4 session in my socket.io app. I'm kind of new with Node and I have ... they have to be the same/different ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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reactjs - Typescript react - Could not find a declaration file for module ''react-materialize'. 'path/to/module-name.js' implicitly has an any type

I am trying to import components from react-materialize as - import {Navbar, NavItem} from 'react-materialize'; ... /blob/master/src/index.js See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ubuntu - Make docker use IPv4 for port binding

I have docker host and inside I have one container. The docker host is binding the port on IPv6 interface only, not on ... R+ 04:11 0:00 ps aux See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mysql - Is there any performance gain in indexing a boolean field?

I'm just about to write a query that includes a WHERE isok=1. As the name implies, isok is a boolean field ... or worse looking up the index? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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185 views

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Get folder name of the file in Python

In Python what command should I use to get the name of the folder which contains the file I'm working with? "C ... any better way to do it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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992 views

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cryptography - How do one-way hash functions work? (Edited)

I read the Wikipedia article about md5 hashes but I still can't understand how a hash can't be "reconstituted" ... function makes it one-way? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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203 views

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PHP include best practices question

I have been learning syntax for PHP and practicing it. I come from a .NET background so masterpages always made ... . Is this good practice? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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iphone - What exactly must I do in viewDidUnload?

I tend to release my stuff in -dealloc, and now iPhone OS 3.0 introduced this funny -viewDidUnload method, ... can clear up the confusion. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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194 views

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Category Hierarchy (PHP/MySQL)

I am trying to get my all categories and sub-categories from MySQL database in a hierarchy: My result should be ... a hirarchy with PHP codes? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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125 views

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Chrome extension to read HTTP response

I have this Chrome extension that modifies the header of requests before sending them. I now would like to ... to an interesting source? Thanks See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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math - Javascript: Round up to the next multiple of 5

I need a utility function that takes in an integer value (ranging from 2 to 5 digits in length) that rounds up to the ... ... How do I do this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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521 views

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vertical & horizontal lines in matplotlib

I do not quite understand why I am unable to create horizontal and vertical lines at specified limits. I would like to ... color='k') plt.show() See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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2.0k views

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python - Why is pow(a, d, n) so much faster than a**d % n?

I was trying to implement a Miller-Rabin primality test, and was puzzled why it was taking so long (> 20 ... when usually PyPy is much faster? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.9k views

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c# - the source file is different from when the module was built

This is driving me crazy. I have a rather large project that I am trying to modify. I noticed earlier that ... or am I just missing something? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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189 views

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android - How to use isInEditMode() to see layout with custom View in the editor

I must edit a software that have a custom view, when I try to edit layout xml, Eclipse says me: Use View.isInEditMode( ... b; } private void drawGraph(Canvas canvas) { long t1 =...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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720 views

1 answer

ruby on rails - Bundler::GemNotFound: Could not find rake-10.3.2 in any of the sources

I have been working with Rails and it sends me back this error. Please provide questions. Thanks for all the help ... . Thanks for all the help. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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