خدمات التطبيق وحدود المجال

package training.catalog;

import org.springframework.stereotype.Service;

record StockDecision(String code, int proposedRemaining) {}

@Service
class StockPolicy {
    StockDecision evaluate(int available, int requested) {
        if (available < 0) throw new IllegalStateException("invalid stock snapshot");
        if (requested <= 0) throw new IllegalArgumentException("quantity");
        return available >= requested
            ? new StockDecision("eligible", available - requested)
            : new StockDecision("insufficient", available);
    }
}

النتيجة قرار على لقطة فقط، ولا يثبت الجزء اكتشاف الكائن أو انتقال الحفظ.

public class Main {
record Decision(String code,int proposedRemaining) {}
static Decision decide(int available,int requested) {
 if(available<0) throw new IllegalStateException("snapshot");
 if(requested<=0) throw new IllegalArgumentException("quantity");
 return available>=requested?new Decision("eligible",available-requested):new Decision("insufficient",available);
}
 public static void main(String[] args) throws Exception {
int available=5;
Decision answer=decide(available,2);
System.out.println(answer.code()+" "+answer.proposedRemaining());
System.out.println("snapshot "+available);
 }
}

eligible 3
snapshot 5

الباقي المقترح 3 وتبقى اللقطة 5؛ وليس ذلك حجزاً مخزناً.