discord4j.common.ResettableInterval Maven / Gradle / Ivy

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/*
 * This file is part of Discord4J.
 *
 * Discord4J is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Discord4J is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Discord4J.  If not, see .
 */
package discord4j.common;

import reactor.core.Disposable;
import reactor.core.publisher.EmitterProcessor;
import reactor.core.publisher.Flux;

import java.time.Duration;

public class ResettableInterval {

    private final EmitterProcessor backing = EmitterProcessor.create(false);
    private volatile Disposable task;
    private volatile Duration period;

    public void start(Duration period) {
        this.period = period;
        this.task = Flux.interval(Duration.ZERO, period).subscribe(backing::onNext);
    }

    public void stop() {
        if (task == null) {
            throw new IllegalStateException("Emitter has not started!");
        }
        task.dispose();
    }

    public Flux ticks() {
        return backing;
    }

    public Duration getPeriod() {
        return period;
    }
}