eu.lucaventuri.fibry.MiniQueue Maven / Gradle / Ivy

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package eu.lucaventuri.fibry;

import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.TimeUnit;

public interface MiniQueue {
    boolean add(T message);

    public boolean offer(T message, long timeout, TimeUnit unit) throws InterruptedException;

    default boolean offer(T message) {
        try {
            return add(message);
        } catch (Exception e) {
            return false;
        }
    }

    T take() throws InterruptedException;

    T poll(long timeout, TimeUnit unit) throws InterruptedException;

    void clear();

    int size();

    T peek();

    /**
     * LinkedBlockingDeque implementing MiniQueue
     */
    static  MiniQueue blocking() {
        class MiniQueuedBlockingQueue extends LinkedBlockingDeque implements MiniQueue {
        }

        return new MiniQueuedBlockingQueue<>();
    }

    /**
     * MiniQueue dropping all the messages
     */
    static  MiniQueue dropping() {
        return new MiniQueue() {
            @Override
            public boolean add(T message) {
                return false;
            }

            @Override
            public boolean offer(T message, long timeout, TimeUnit unit) throws InterruptedException {
                return false;
            }

            @Override
            public T take() throws InterruptedException {
                throw new UnsupportedOperationException("This queue drops all the message and so cannot provide the take() operation ");
            }

            @Override
            public T poll(long timeout, TimeUnit unit) {
                throw new UnsupportedOperationException("This queue drops all the message and so cannot provide the poll() operation ");
            }

            @Override
            public void clear() {
            }

            @Override
            public int size() {
                return 0;
            }

            @Override
            public T peek() {
                return null;
            }
        };
    }
}