BlockBeacon.java

    public static void c(final World world, final BlockPosition blockposition) {
        HttpUtilities.a.submit(new Runnable() {
            public void run() {
                Chunk chunk = world.getChunkAtWorldCoords(blockposition);

                for (int i = blockposition.getY() - 1; i >= 0; --i) {
                    final BlockPosition blockposition1 = new BlockPosition(blockposition.getX(), i, blockposition.getZ());

                    if (!chunk.c(blockposition1)) {
                        break;
                    }

                    IBlockData iblockdata = world.getType(blockposition1);

                    if (iblockdata.getBlock() == Blocks.BEACON) {
                        ((WorldServer) world).postToMainThread(new Runnable() {
                            public void run() {
                                TileEntity tileentity = world.getTileEntity(blockposition);

                                if (tileentity instanceof TileEntityBeacon) {
                                    ((TileEntityBeacon) tileentity).n();
                                    world.playBlockAction(blockposition, Blocks.BEACON, 1, 0);
                                }

                            }
                        });
                    }
                }

            }
        });
    }