How to use

MultiServantLogic

in

slimeknights.mantle.multiblock

 protected boolean isValidSlave(World world, BlockPos pos) {
  if(!world.isBlockLoaded(pos)) {
   return false;
  }
  TileEntity te = world.getTileEntity(pos);

  // slave-blocks are only allowed if they already belong to this smeltery
  if(te instanceof MultiServantLogic) {
   MultiServantLogic slave = (MultiServantLogic) te;
   if(slave.hasValidMaster()) {
    if(!tile.getPos().equals(slave.getMasterPosition())) {
     return false;
    }
   }
  }

  return true;
 }
}

 public static void assignMultiBlock(World world, BlockPos master, List<BlockPos> servants) {
  TileEntity masterBlock = world.getTileEntity(master);
  if(!(masterBlock instanceof IMasterLogic)) {
   throw new IllegalArgumentException("Master must be of IMasterLogic");
  }

  // assign master to each servant
  for(BlockPos pos : servants) {
   if(world.isBlockLoaded(pos)) {
    TileEntity slave = world.getTileEntity(pos);
    if(slave instanceof MultiServantLogic && slave.getWorld() != null) {
     ((MultiServantLogic) slave).overrideMaster(master);
     IBlockState state = world.getBlockState(pos);
     world.notifyBlockUpdate(pos, state, state, 3);
    }
   }
  }
 }
}

@Override
public void onDataPacket(NetworkManager net, SPacketUpdateTileEntity pkt) {
 super.onDataPacket(net, pkt);
 readFromNBT(pkt.getNbtCompound());
}

@Override
public boolean verifyMaster(IMasterLogic logic, World world, BlockPos pos) {
 if(this.hasMaster) {
  return this.hasValidMaster();
 }
 else {
  this.overrideMaster(pos);
  return true;
 }
}

@Override
public void notifyMasterOfChange() {
 if(this.hasValidMaster()) {
  IMasterLogic logic = (IMasterLogic) this.world.getTileEntity(this.master);
  logic.notifyChange(this, this.pos);
 }
}

public void readFromNBT(NBTTagCompound tags) {
 super.readFromNBT(tags);
 this.readCustomNBT(tags);
public NBTTagCompound writeToNBT(NBTTagCompound tags) {
 tags = super.writeToNBT(tags);
 return this.writeCustomNBT(tags);
public NBTTagCompound getUpdateTag() {
 NBTTagCompound tag = new NBTTagCompound();
 this.writeCustomNBT(tag);
 return tag;

@Override
public void onDataPacket(NetworkManager net, SPacketUpdateTileEntity packet) {
 this.readCustomNBT(packet.getNbtCompound());
 this.world.notifyLightSet(this.pos);
 IBlockState state = world.getBlockState(this.pos);
 this.world.notifyBlockUpdate(this.pos, state, state, 3);
}

@Deprecated
public boolean setMaster(BlockPos pos) {
 if(!this.hasMaster || this.world.getBlockState(this.master) != this.state || (this.world
                                            .getBlockState(this.master)
                                            .getBlock() != this.masterBlock)) {
  this.overrideMaster(pos);
  return true;
 }
 else {
  return false;
 }
}