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Cache Invalidation — Is there a General Solution?
... cannot have your cake and eat it...
If you can layer an additional cache based on a over the top then this affects the initial problem not one bit. If you chose 1 then you have whatever freedom you gave yourself and can thus cache more but must remember to consider the validity of the cached value...
What's wrong with overridable method calls in constructors?
...ide {
public static void main(String[] args) {
abstract class Base {
Base() {
overrideMe();
}
abstract void overrideMe();
}
class Child extends Base {
final int x;
Child(int x) {
...
Subclassing a Java Builder class
...ed the "Curiously recurring generic patterns"
Make the return type of the base class builder methods a generic argument.
public class NutritionFacts {
private final int calories;
public static class Builder<T extends Builder<T>> {
private int calories = 0;
p...
What is normalized UTF-8 all about?
...Conclusion
If in doubt, go with canonical normalization. Choose NFC or NFD based on the space/speed trade-off applicable, or based on what is required by something you are inter-operating with.
share
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How to show SQL queries run in the Rails console?
...r record.associated_things ) in the console, how can I see the actual database queries being run so I can gain more understanding of what is happening?
...
SQLAlchemy - Getting a list of tables
... the metadata yourself. Fortunately, the metadata is still present on the baseclass,
>>> Base = sqlalchemy.ext.declarative.declarative_base()
>>> Base.metadata
MetaData(None)
If you are trying to figure out what tables are present in your database, even among the ones you have...
targetContentOffsetForProposedContentOffset:withScrollingVelocity without subclassing UICollectionVi
...
Here's my implementation in Swift 5 for vertical cell-based paging:
override func targetContentOffset(forProposedContentOffset proposedContentOffset: CGPoint, withScrollingVelocity velocity: CGPoint) -> CGPoint {
guard let collectionView = self.collectionView else {
...
Read properties file outside JAR file
...ng (depending on the current state of the program) since it is just a text-based file. For example, your main.properties file may contain:
app.version=1.0.0.0
app.name=Hello
So, when you run your main program from its root/base folder, normally you will run it like this:
java -jar ./main.jar
o...
Get properties and values from unknown object
...e members to a file, but you shouldn't use this information to drive logic based on property sets.
Assuming you have control over the implementations of the types, you should derive from a common base class or implement a common interface and make the calls on those (you can use the as or is operat...
What does 'predicate' mean in the context of computer science? [duplicate]
...s, but in general we can use the term for any function that returns a bool based on evaluation of the truth of an assertion.
For sorting, might want have the member function
bool Fruit::ComesAfter(Fruit x) ...
as our predicate. If x comes after us, our sorting algorithm will swap the two fruits...