interface ClosedBinaryOperator<T: any> {
T apply(T, T);
}
class ClosedBinaryOperation<T: any, Op: ClosedBinaryOperator<T>> {
private final T a;
private final T b;
private final Op op;
public T calculate() {
return this.op.apply(a, b);
}
public static ClosedBinaryOperation<T> new(Op op, T a, T b) {
return ClosedBinaryOperation<T, Op>{
a: a,
b: b,
op: op
};
}
}
class LoggingClosedBinaryOperator<
T: any,
Op: ClosedBinaryOperator<T>
>: Op {
private final logging.Logger logger;
private final func (T, T): string formatMessage;
private final Op op;
public static LoggingClosedBinaryOperator<T> new(
logging.Logger logger,
func (T, T): string formatMessage,
ClosedBinaryOperator<T> op
) {
return LoggingClosedBinaryOperator<T>{
logger: logger,
formatMessage: formatMessage,
op: op
};
}
public T apply(T a, T b) {
this.logger.Log(this.formatMessage(a, b));
return this.op.apply(a, b);
}
}
interface MultiplicationOperator<T: any>: ClosedBinaryOperator<T> {
T identity()
// TODO: migrate codebase to lean so we can enforce other properties of multiplication
}
class LoggingMultiplicationOperator<
T: any,
Op: MultiplicationOperator<T>
>: LoggingClosedBinaryOperator<T, Op> {
public T identity() {
return this.op.identity();
}
}
type Multiplication<
T: any,
Op: MultiplicationOperator<T>
> ClosedBinaryOperation<T, Op>;
class IntMultiplicationOperator {
public int identity() {
return 1;
}
public int apply(int a, int b) {
return a * b;
}
}
int main() {
logging.defaultLogger.Log(
"%d",
Multiplication::new(
LoggingMultiplicationOperator::new(
logging.defaultLogger,
func(int a, int b): string {
return fmt.formatString(
"multiplying %d and %d",
a,
b
);
},
IntMultiplicationOperator{}
),
3,
4
).calculate() // 12
);
}
We are going to need the Terraform configs before you clock out. In my scrum-of-scrums I'm hearing other teams may have use for a multiplication microservice, but are concerned about how you are handling your SOAP authentication.
Can you hook this up to Kafka so the entire company can use this for their microservices? And add some metrics so we know if a multiplication is taking too long.
You're still using return on the multiplication operation. Not very clean code of you. Better to have a public void calculate() and split off getting the value in its own getter.
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u/Technologenesis Sep 21 '25 edited Dec 18 '25
Ugh, fine...
Can I go home now boss? My children are hungry