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There is a newer version: 1.4.0

package com.bigcustard.util;

public class CompositeWatchable extends Watchable {
    private final WatchableValue[] watchables;

    public CompositeWatchable(WatchableValue... watchables) {
        this.watchables = watchables;
        for (WatchableValue watchable : watchables) {
            watchable.watch((ignored) -> broadcast());
        }
    }

    public void watch(Runnable listener) {
        super.watch((ignored) -> listener.run());
        broadcast();
    }

    public void broadcast() {
        broadcast(null);
    }
}