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A very feature rich framework for discord bot commands written in Java

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package me.schlaubi.commandcord.event;

import me.schlaubi.commandcord.event.events.Event;

import java.util.ArrayList;

/**
 * @author Schlaubi / Michael Rittmeister
 */

public class EventManager {

    public ArrayList listeners = new ArrayList<>();

    /**
     * Register a eventListener
     *
     * @param listener Listener object
     */
    public void registerListener(Listener listener) {
        if (!(listener instanceof EventAdapter))
            throw new IllegalArgumentException("Listener needs to extend EventAdapter");
        if (!listeners.contains(listener))
            listeners.add(listener);
    }

    /**
     * Removes a eventListener
     *
     * @param listener Listener object
     */
    public void unregister(Listener listener) {
        if (!(listener instanceof EventAdapter))
            throw new IllegalArgumentException("Listener needs to extend EventAdapter");
        listeners.remove(listener);
    }

    public void call(Event event) {
        listeners.forEach(l -> {
            try {
                new Thread(() -> {
                    ((EventAdapter) l).onEvent(event);
                }).start();
            } catch (Exception e) {
                e.printStackTrace();
            }
        });
    }
}