Issue in abstracting common code using function interface

Question

here I have implemented two following functions like below:

  Output1 computeFirst(Input1 input) {
        String lockName = input.getId();
        LockItem lock         


        

Answer 1

Runnable would not work as there is an output as well.

public interface Identifiable{
    String getId();
}

public static <T extends Identifiable,R> R executeWithLock(T input, Function<T,R> func) {
    String lockName = input.getId();
    LockItem lockItem = acquireLock(lockName);
    try{
        return func.apply(input);
    } catch(Exception e){
        log.error(e);
        return null;
    } finally {
        releaseLock(lockItem);
    }
}

call like

Output1 output = executeWithLock(input1, 
    (input) -> {return /*compute output as in critical section*/ null;});