src/main/java/com/it_jaros/jscanner/PollState.java


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package com.it_jaros.jscanner;

/**
 * A sealed interface representing the three possible outcomes of a CompletionService
 * poll operation: successful result, task failure, or not ready yet.
 * Makes error handling explicit — Failure and Unavailable are distinct and compile-time
 * required to handle via exhaustiveness checking in switch statements.
 */
public sealed interface PollState<T> {
    record Success<T>(T value) implements PollState<T> {}
    record Failure<T>(Throwable error) implements PollState<T> {}
    record Unavailable<T>() implements PollState<T> {}
}