CompletableScheduledFuture.java
package net.morimekta.testing.concurrent.internal;
import net.morimekta.testing.concurrent.FakeClock;
import java.time.Instant;
import java.util.Objects;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Delayed;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import static java.util.Objects.requireNonNull;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
public class CompletableScheduledFuture<T> extends CompletableFuture<T> implements ScheduledFuture<T> {
private final FakeClock clock;
private final AtomicReference<Instant> nextExecution;
public CompletableScheduledFuture(FakeClock clock, AtomicReference<Instant> nextExecution) {
this.clock = requireNonNull(clock, "clock == null");
this.nextExecution = requireNonNull(nextExecution, "nextExecution == null");
}
@Override
public long getDelay(TimeUnit timeUnit) {
Instant now = clock.instant();
Instant next = nextExecution.get();
if (now.isAfter(next)) {
return 0L;
}
return timeUnit.convert(next.toEpochMilli() - now.toEpochMilli(), MILLISECONDS);
}
@Override
public int compareTo(Delayed delayed) {
long otherDelay = delayed.getDelay(MILLISECONDS);
long myDelay = getDelay(MILLISECONDS);
return Long.compare(myDelay, otherDelay);
}
@Override
@SuppressWarnings("unchecked")
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
CompletableScheduledFuture<Object> that = (CompletableScheduledFuture<Object>) o;
return isDone() == that.isDone() &&
isCancelled() == that.isCancelled() &&
nextExecution.get() == that.nextExecution.get() &&
Objects.equals(getNow((T) ABSENT), that.getNow(ABSENT));
}
@Override
@SuppressWarnings("unchecked")
public int hashCode() {
return Objects.hash(isDone(), isCancelled(), nextExecution.get(), getNow((T) ABSENT));
}
private static final Object ABSENT = new Object();
}