Test for the bulk block change API.

BulkBlockTest.java

import org.bukkit.*;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.plugin.java.JavaPlugin;

public class BulkBlockTest extends JavaPlugin implements Listener {
    @Override
    public void onEnable() {
        Bukkit.getPluginManager().registerEvents(this, this);
    }

    @EventHandler
    public void dig(PlayerInteractEvent event) {
            Player player = event.getPlayer();
            player.sendMessage(ChatColor.GREEN + "Beginning chunk transformation...");
            long start = System.currentTimeMillis();

            Location loc = player.getTargetBlock(null, 200).getLocation();
            World world = loc.getWorld();
            Chunk c = world.getChunkAt(loc);

            int cx = c.getX() << 4;
            int cz = c.getZ() << 4;

            for (int x = cx; x < cx + 16; x++) {
                for (int z = cz; z < cz + 16; z++) {
                    for (int y = 0; y < 128; y++) {
                        world.setBlockTypeFast(x, y, z, Material.GLASS);
                    }
                }
            }

            event.getPlayer().updateChunk(c);
            long millis = System.currentTimeMillis() - start;
            player.sendMessage(ChatColor.GREEN + "Transformation complete in " + (millis / 1000) + " seconds (" + millis + "ms)!");
        }
}