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Mutiny Zero is a minimal API for creating reactive-streams compliant publishers

There is a newer version: 1.1.1

package mutiny.zero.internal;

import java.util.Queue;
import java.util.concurrent.Flow;
import java.util.concurrent.LinkedBlockingDeque;

public class LatestTube extends BufferingTubeBase {

    private final LinkedBlockingDeque overflowQueue;

    public LatestTube(Flow.Subscriber subscriber, int bufferSize) {
        super(subscriber);
        overflowQueue = new LinkedBlockingDeque<>(bufferSize);
    }

    @Override
    Queue overflowQueue() {
        return overflowQueue;
    }

    @Override
    protected void handleItem(T item) {
        if (outstandingRequests() > 0L) {
            dispatchQueue.offer(item);
            drainLoop();
        } else if (!overflowQueue.offer(item)) {
            overflowQueue.remove();
            overflowQueue.offer(item);
        }
    }
}