src/main/java/at/ac/tuwien/sbc/valesriegler/xvsm/WaiterXVSM.java

   1 package at.ac.tuwien.sbc.valesriegler.xvsm;
   2
   3 import java.io.Serializable;
   4 import java.util.Arrays;
   5 import java.util.List;
   6
   7 import at.ac.tuwien.sbc.valesriegler.common.OrderId;
   8 import at.ac.tuwien.sbc.valesriegler.types.*;
   9 import org.mozartspaces.core.MzsConstants.RequestTimeout;
  10 import org.mozartspaces.core.MzsCoreException;
  11 import org.mozartspaces.core.TransactionReference;
  12 import org.slf4j.Logger;
  13 import org.slf4j.LoggerFactory;
  14
  15 import at.ac.tuwien.sbc.valesriegler.common.Util;
  16
  17 public class WaiterXVSM extends AbstractXVSMConnector {
  18         private static final Logger log = LoggerFactory.getLogger(WaiterXVSM.class);
  19         private final int waiterId;
  20
  21         public WaiterXVSM(int waiterId, int port) {
  22                 super(port);
  23
  24                 this.waiterId = waiterId;
  25
  26                 freeTablesContainer = useContainer(Util.FREE_TABLES);
  27                 assignTableContainer = useContainer(Util.ASSIGN_TABLE);
  28                 takeOrderContainer = useContainer(Util.TAKE_ORDER);
  29                 orderTakenContainer = useContainer(Util.ORDER_TAKEN);
  30                 preparePizzasContainer = useContainer(Util.PREPARE_PIZZAS);
  31                 orderCompleteContainer = useContainer(Util.ORDER_COMPLETE);
  32                 deliverPizzasContainer = useContainer(Util.DELIVER_PIZZAS);
  33                 paymentRequestContainer = useContainer(Util.PAYMENT_REQUEST);
  34                 paymentDoneContainer = useContainer(Util.PAYMENT_DONE);
  35                 tableAssignedContainer = useContainer(Util.TABLE_ASSIGNED);
  36                 infoContainer = useContainer(Util.INFO);
  37         }
  38
  39         public void listenForFreeTable() {
  40                 SpaceListener listener = new SpaceListenerImpl(capi, freeTablesContainer, false) {
  41
  42                         @Override
  43                         void onEntriesWritten(List<? extends Serializable> entries) throws Exception {
  44
  45                                 List<Table> tables = castEntries(entries);
  46
  47                                 for (Table table : tables) {
  48
  49                                         TransactionReference tx = getDefaultTransaction();
  50
  51                                         // Acquire a lock for the free table in the
  52                                         // FreeTableContainer
  53                                         int id = table.getId();
  54
  55                                         Table tableTemplate = new Table(id);
  56                                         try {
  57                                                 Table lockedFreeTable = takeMatchingEntity(tableTemplate,
  58                                                                 freeTablesContainer, tx, RequestTimeout.DEFAULT,
  59                                                                 String.format("There was no free table found with id %d", id));
  60
  61
  62                                                 GroupData groupTemplate = new GroupData();
  63                                                 GroupData lockedGroup = takeMatchingEntity(groupTemplate,
  64                                                                 assignTableContainer, tx, RequestTimeout.DEFAULT,
  65                                                                 "There is no group waiting for a table at the moment");
  66
  67                                                 assignGroupToTable(lockedGroup, lockedFreeTable, tx);
  68                                         } catch (Exception e) {
  69 //                                              log.info(e.getMessage());
  70                                         }
  71                                 }
  72                         }
  73                 };
  74
  75                 createNotification(listener, freeTablesContainer);
  76         }
  77
  78
  79
  80         public void listenForNewGuests() {
  81                 SpaceListener listener = new SpaceListenerImpl(capi, assignTableContainer) {
  82
  83                         @Override
  84                         void onEntriesWritten(List<? extends Serializable> entries)
  85                                         throws Exception {
  86                                 log.info("New guest groups have arrived");
  87
  88                                 List<GroupData> groups = castEntries(entries);
  89
  90                                 for (GroupData group : groups) {
  91
  92                                         TransactionReference tx = getDefaultTransaction();
  93
  94                                         // Acquire a lock for the group in the
  95                                         // AssignTableContainer
  96                                         String groupNotFound = String.format("Group with id %d was already assigned a table by another waiter!", group.getId());
  97
  98                                         try {
  99                                                 GroupData lockedGroup = takeMatchingEntity(
 100                                                                 new GroupData(group.getId()),
 101                                                                 assignTableContainer, tx,
 102                                                                 RequestTimeout.DEFAULT, groupNotFound);
 103                                                 // Acquire a lock for one free table in the
 104                                                 // TablesContainer
 105                                                 String noFreeTable = String.format("No free table for group with id %d could be found", group.getId());
 106                                                 Table lockedFreeTable = takeMatchingEntity(new Table(null), freeTablesContainer, tx, RequestTimeout.DEFAULT,
 107                                                                 noFreeTable);
 108
 109                                                 assignGroupToTable(lockedGroup, lockedFreeTable, tx);
 110                                         } catch (Exception e) {
 111 //                                              log.info(e.getMessage());
 112                                         }
 113                                 }
 114                         }
 115                 };
 116
 117                 createNotification(listener, assignTableContainer);
 118         }
 119
 120     public void listenForPaymentRequest() {
 121                 SpaceListener paymentListener = new SpaceListenerImpl(capi, paymentRequestContainer) {
 122
 123                         @Override
 124                         void onEntriesWritten(List<? extends Serializable> entries)
 125                                         throws Exception {
 126
 127                                 List<GroupData> groups = castEntries(entries);
 128
 129                                 for (GroupData groupData : groups) {
 130                                         TransactionReference tx = getDefaultTransaction();
 131                                         GroupData entity = new GroupData(groupData.getId());
 132
 133                                         // Acquire the lock so that another waiter can't do the same
 134                                         // thing!
 135                                         String paymentRequestTakenByOtherWaiter = String.format(
 136                                                         "The payment request for group %d was already taken by an other waiter!",
 137                                                         groupData.getId());
 138                                         try {
 139                                                 takeMatchingEntity(entity, paymentRequestContainer, tx, RequestTimeout.DEFAULT, paymentRequestTakenByOtherWaiter);
 140
 141                                                 groupData.setPayingWaiter(waiterId);
 142
 143                                                 sendItemsToContainer(Arrays.asList(groupData), paymentDoneContainer, RequestTimeout.ZERO, tx);
 144
 145                                                 capi.commitTransaction(tx);
 146                                         } catch (Exception e) {
 147 //                                              log.info(e.getMessage());
 148                                         }
 149                                 }
 150                         }
 151                 };
 152
 153                 createNotification(paymentListener, paymentRequestContainer);
 154         }
 155
 156         public void listenForOrderRequests() {
 157                 SpaceListener ordersListener = new SpaceListenerImpl(capi, takeOrderContainer) {
 158
 159                         @Override
 160                         void onEntriesWritten(List<? extends Serializable> entries)
 161                                         throws Exception {
 162
 163                                 List<GroupData> groups = castEntries(entries);
 164
 165                                 for (GroupData groupData : groups) {
 166
 167                                         TransactionReference tx = getDefaultTransaction();
 168                                         GroupData entity = new GroupData(groupData.getId());
 169                                         entity.setState(GroupState.SITTING);
 170
 171                                         try {
 172                                                 // Acquire the lock so that another waiter can't do the same thing!
 173                                                 String orderTakenByOtherWaiter = String.format(
 174                                                                 "The order for group %d was already taken by an other waiter!",
 175                                                                 groupData.getId());
 176                                                 takeMatchingEntity(entity, takeOrderContainer, tx, RequestTimeout.DEFAULT, orderTakenByOtherWaiter);
 177
 178                                                 groupData.setOrderWaiter(waiterId);
 179                                                 groupData.setState(GroupState.ORDERED);
 180                                                 Order order = groupData.getOrder();
 181                                                 order.setStatus(OrderStatus.ORDERED);
 182
 183                         /*  get the id of the last order of the pizzeria and set the order accordingly and
 184                             update the space */
 185                         final OrderId orderId = takeMatchingEntity(new OrderId(null), infoContainer, tx, RequestTimeout.INFINITE, "The Order id object could not be taken from the space!");
 186                         final int id = orderId.getId();
 187                         final int nextId = id+1;
 188                         order.setId(nextId);
 189                         final List<PizzaOrder> orderedPizzas = order.getOrderedPizzas();
 190                         for (PizzaOrder orderedPizza : orderedPizzas) {
 191                             orderedPizza.setOrderId(nextId);
 192                         }
 193                         sendItemsToContainer(Arrays.asList(new OrderId(nextId)), infoContainer, RequestTimeout.DEFAULT, tx);
 194
 195                         // send the order as a whole to the space
 196                                                 sendItemsToContainer(Arrays.asList(groupData),
 197                                 orderTakenContainer, RequestTimeout.ZERO, tx);
 198                                                 sendItemsToContainer(order.getOrderedPizzas(),
 199                                                                 preparePizzasContainer, RequestTimeout.ZERO, tx);
 200                                                 capi.commitTransaction(tx);
 201
 202                                                 log.info("Waiter has taken order from group {}",
 203                                                                 groupData.getId());
 204                                         } catch (Exception e) {
 205 //                                              log.info(e.getMessage());
 206                                         }
 207                                 }
 208                         }
 209                 };
 210
 211                 createNotification(ordersListener, takeOrderContainer);
 212         }
 213
 214         public void listenForPreparedPizzas() {
 215                 /**
 216                  * A waiter gets informed when a new pizza is complete. He takes the
 217                  * orderId of the pizza and looks up the corresponding order from which
 218                  * he gets the number of necessary pizzas of the order. He then tries to
 219                  * fetch all pizzas with the corresponding orderId and compares the
 220                  * number of those pizzas with the number of necessary pizzas. If all
 221                  * pizzas of an order are complete he then delivers them!
 222                  */
 223                 SpaceListener preparedPizzasListener = new SpaceListenerImpl(capi, deliverPizzasContainer) {
 224
 225                         @Override
 226                         void onEntriesWritten(List<? extends Serializable> entries)
 227                                         throws Exception {
 228
 229                                 List<Pizza> pizzas = castEntries(entries);
 230
 231                                 for (Pizza pizza : pizzas) {
 232                                         int orderId = pizza.getOrderId();
 233
 234                                         TransactionReference tx = getDefaultTransaction();
 235
 236                                         try {
 237                                                 GroupData entity = new GroupData();
 238                                                 entity.setState(null);
 239                                                 Order order = new Order();
 240                                                 order.setId(orderId);
 241                                                 entity.setOrder(order);
 242
 243                                                 GroupData groupData = takeMatchingEntity(entity,
 244                                                                 orderTakenContainer, tx, RequestTimeout.DEFAULT,
 245                                                                 "Another waiter just checks if the order is complete");
 246                                                 int groupId = groupData.getId();
 247                                                 int numberOfPizzas = groupData.getOrder().getNumberOfPizzas();
 248
 249                                                 Pizza pizzaTemplate = new Pizza();
 250                                                 pizzaTemplate.setOrderId(orderId);
 251
 252                                                 List<Pizza> pizzasOfOrder = takeMatchingEntities(
 253                                                                 pizzaTemplate, deliverPizzasContainer, tx,
 254                                                                 RequestTimeout.DEFAULT,
 255                                                                 "Cannot take the pizzas from the deliverPizzasContainer");
 256
 257                                                 if (pizzasOfOrder.size() == numberOfPizzas) {
 258                                                         GroupData group = new GroupData();
 259                                                         group.setServingWaiter(waiterId);
 260                                                         Order completeOrder = new Order();
 261                                                         completeOrder.setId(orderId);
 262                                                         completeOrder.setGroupId(groupId);
 263                                                         group.setOrder(completeOrder);
 264                                                         sendItemsToContainer(Arrays.asList(group),
 265                                                                         orderCompleteContainer, RequestTimeout.DEFAULT,
 266                                                                         tx);
 267                                                         capi.commitTransaction(tx);
 268                                                 } else {
 269                                                         log.info("Not yet all pizzas prepared! Order with id "
 270                                                                         + orderId + " has " + numberOfPizzas
 271                                                                         + " pizzas, but only " + pizzasOfOrder.size()
 272                                                                         + " pizzas are ready by now!");
 273                                                         capi.rollbackTransaction(tx);
 274                                                 }
 275                                         } catch (NullPointerException e) {
 276
 277                                         } catch (Exception e) {
 278                                                 capi.rollbackTransaction(tx);
 279                                         }
 280                                 }
 281                         }
 282                 };
 283
 284                 createNotification(preparedPizzasListener, deliverPizzasContainer);
 285         }
 286
 287         private void assignGroupToTable(GroupData lockedGroup,
 288                         Table lockedFreeTable, TransactionReference tx)
 289                         throws MzsCoreException {
 290                 // The new group sits down at the table
 291                 lockedFreeTable.setGroupId(lockedGroup.getId());
 292
 293                 // The new group now wants to order
 294                 lockedGroup.setState(GroupState.SITTING);
 295                 lockedGroup.setTable(lockedFreeTable);
 296                 lockedGroup.setTableWaiter(waiterId);
 297
 298                 sendItemsToContainer(Arrays.asList(lockedFreeTable),
 299                                 tableAssignedContainer, RequestTimeout.ZERO, tx);
 300                 sendItemsToContainer(Arrays.asList(lockedGroup), takeOrderContainer,
 301                                 RequestTimeout.ZERO, tx);
 302
 303                 try {
 304                         capi.commitTransaction(tx);
 305                         log.info("Assigned table to group with groupId {}",
 306                                         lockedGroup.getId());
 307                 } catch (Exception e) {
 308                         log.info("Assigning a table to group with groupId {} failed",
 309                                         lockedGroup.getId());
 310                         log.info(e.getMessage());
 311                 }
 312         }
 313
 314 }