io.atleon.core.Acknowledgement Maven / Gradle / Ivy
package io.atleon.core;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.function.Consumer;
/**
* Wrapper for positive and negative acknowledgement that guarantees only one is ever executed.
*/
public final class Acknowledgement {
private final Runnable acknowledger;
private final Consumer nacknowledger;
private final AtomicBoolean once = new AtomicBoolean(false);
private Acknowledgement(Runnable acknowledger, Consumer nacknowledger) {
this.acknowledger = acknowledger;
this.nacknowledger = nacknowledger;
}
public static Acknowledgement create(Runnable acknowledger, Consumer nacknowledger) {
return new Acknowledgement(acknowledger, nacknowledger);
}
public void positive() {
if (once.compareAndSet(false, true)) {
acknowledger.run();
}
}
public void negative(Throwable error) {
if (once.compareAndSet(false, true)) {
nacknowledger.accept(error);
}
}
}