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What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?
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1075
Let's say you have a collection of Car objects (database rows), and each Car has a collection ...
What does OSGi solve?
...PI is surprisingly simple. The core API is only one package and less than 30 classes/interfaces. This core API is sufficient to write bundles, install them, start, stop, update, and uninstall them and includes all listener and security classes. There are very few APIs that provide so much functional...
Abusing the algebra of algebraic data types - why does this work?
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140
Disclaimer: A lot of this doesn't really work quite right when you account for ⊥, so I'm going...
How to declare global variables in Android?
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I wrote this answer back in '09 when Android was relatively new, and there were many not well established areas in Android development. I have added a long addendum at the bottom of this post, addressing some criticism, and detailing a philosophical disa...
REST vs JSON-RPC? [closed]
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+50
The fundamental problem with RPC is coupling. RPC clients become tightly coupled to service implementation in several ways and it beco...
How do cache lines work?
...recast a memory access (and prefetch it), the retrieval process can take ~90 nanoseconds, or ~250 clock cycles (from the CPU knowing the address to the CPU receiving data).
By contrast, a hit in L1 cache has a load-use latency of 3 or 4 cycles, and a store-reload has a store-forwarding latency of 4...
What is the difference between “JPG” / “JPEG” / “PNG” / “BMP” / “GIF” / “TIFF” Image?
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answered Jan 7 '09 at 8:42
coobirdcoobird
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What is the purpose of a stack? Why do we need it?
...d this question so much I made it the subject of my blog on November 18th 2011. Thanks for the great question!
I've always wondered: what is the purpose of the stack?
I assume you mean the evaluation stack of the MSIL language, and not the actual per-thread stack at runtime.
Why is there...
Difference between
...t<? super T> dest, List<? extends T> src) {
for (int i = 0; i < src.size(); i++)
dest.set(i, src.get(i));
}
}
Also see
How can I add to List<? extends Number> data structures?
share...