Main.java

public class SmoothBlockInterrupt {
		private final Map<Player, BukkitTask> tasks = new HashMap<>();
		
		public SmoothBlockInterrupt(Plugin plugin, BiConsumer<Block, Player> interruptions) {
			getProtocolManager().addPacketListener(new PacketAdapter(plugin, BLOCK_DIG) {
				@Override
				public void onPacketReceiving(PacketEvent event) {
					Player player = event.getPlayer();
					Block block = event.getPacket()
							.getBlockPositionModifier().read(0)
							.toLocation(player.getWorld()).getBlock();
					
					switch (event.getPacket().getPlayerDigTypes().getValues().get(0)) {
						case START_DESTROY_BLOCK: {
							tasks.compute(player, ($, task) -> {
								if (task != null)
									task.cancel();
								return getScheduler().runTaskLater(plugin, () -> {
									interruptions.accept(block, player);
									tasks.remove(player);
								}, getBreakTime(player, block));
							});
							break;
						}
						case ABORT_DESTROY_BLOCK:
						case STOP_DESTROY_BLOCK: {
							BukkitTask remove = tasks.remove(player);
							if (remove != null)
								remove.cancel();
						}
					}
				}
			});
		}
		
		protected long getBreakTime(Player player, Block block) {
			return 100; //TODO fill this in or a find a way to pull from nms.
		}
	}