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package soundbot;
import com.sedmelluq.discord.lavaplayer.player.AudioPlayer;
import com.sedmelluq.discord.lavaplayer.player.event.AudioEventAdapter;
import com.sedmelluq.discord.lavaplayer.track.AudioTrack;
import com.sedmelluq.discord.lavaplayer.track.AudioTrackEndReason;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
/**
* This class schedules tracks for the audio player. It contains the queue of tracks.
*/
public class TrackScheduler extends AudioEventAdapter {
private final AudioPlayer player;
private final BlockingQueue<AudioTrack> queue;
/**
* @param player The audio player this scheduler uses
*/
public TrackScheduler(AudioPlayer player) {
this.player = player;
this.queue = new LinkedBlockingQueue<>();
}
/**
* Add the next track to queue or play right away if nothing is in the queue.
*
* @param track The track to play or add to queue.
*/
public void queue(AudioTrack track) {
// Calling startTrack with the noInterrupt set to true will start the track only if nothing is currently playing. If
// something is playing, it returns false and does nothing. In that case the player was already playing so this
// track goes to the queue instead.
if (!player.startTrack(track, true)) {
queue.offer(track);
}
}
/**
* Start the next track, stopping the current one if it is playing.
*/
public void nextTrack() {
// Start the next track, regardless of if something is already playing or not. In case queue was empty, we are
// giving null to startTrack, which is a valid argument and will simply stop the player.
player.startTrack(queue.poll(), false);
}
@Override
public void onTrackEnd(AudioPlayer player, AudioTrack track, AudioTrackEndReason endReason) {
// Only start the next track if the end reason is suitable for it (FINISHED or LOAD_FAILED)
if (endReason.mayStartNext) {
nextTrack();
}
}
}
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