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How to deal with a slow SecureRandom generator?
...f you want true random data, then unfortunately you have to wait for it. This includes the seed for a SecureRandom PRNG. Uncommon Maths can't gather true random data any faster than SecureRandom, although it can connect to the internet to download seed data from a particular website. My guess is tha...
Difference between volatile and synchronized in Java
...iable as volatile and always accessing the variable in a synchronized(this) block in Java?
4 Answers
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Apache Spark: The number of cores vs. the number of executors
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To hopefully make all of this a little more concrete, here’s a worked example of configuring a Spark app to use as much of the cluster as
possible: Imagine a cluster with six nodes running NodeManagers, each
equipped with 16 cores and 64GB of memory....
Inversion of Control vs Dependency Injection
According to the paper written by Martin Fowler , inversion of control is the principle where the control flow of a program is inverted: instead of the programmer controlling the flow of a program, the external sources (framework, services, other components) take control of it. It's like we plug so...
How can a Java variable be different from itself?
I am wondering if this question can be solved in Java (I'm new to the language). This is the code:
10 Answers
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Check if an image is loaded (no errors) with jQuery
...he jQuery library to manipulate image thumbnails contained in a unordered list. When the image is loaded it does one thing, when an error occurs it does something else. I'm using jQuery load() and error() methods as events. After these events I check the image DOM element for the .complete to m...
Which is faster : if (bool) or if(int)?
...ith bool and int in if condition. So just out of curiosity I wrote this program:
8 Answers
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Anatomy of a “Memory Leak”
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The best explanation I've seen is in Chapter 7 of the free Foundations of Programming e-book.
Basically, in .NET a memory leak occurs when referenced objects are rooted and thus cannot be garbage collected. This occurs accidentally when you hold on to ref...
What is the difference between HTTP_HOST and SERVER_NAME in PHP?
What is the difference between HTTP_HOST and SERVER_NAME in PHP?
10 Answers
10
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Django datetime issues (default=datetime.now())
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it looks like datetime.now() is being evaluated when the model is defined, and not each time you add a record.
Django has a feature to accomplish what you are trying to do already:
date = models.DateTimeField(auto_now_add=True, blank=True)
or
date =...