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.net.URI;
   5 import java.util.Arrays;
   6 import java.util.Collections;
   7 import java.util.Iterator;
   8 import java.util.List;
   9
  10 import at.ac.tuwien.sbc.valesriegler.common.OrderId;
  11 import org.mozartspaces.capi3.AnyCoordinator;
  12 import org.mozartspaces.capi3.FifoCoordinator;
  13 import org.mozartspaces.capi3.LindaCoordinator;
  14 import org.mozartspaces.core.ContainerReference;
  15 import org.mozartspaces.core.MzsConstants;
  16 import org.mozartspaces.core.MzsConstants.RequestTimeout;
  17 import org.mozartspaces.core.MzsCoreException;
  18 import org.mozartspaces.core.TransactionException;
  19 import org.mozartspaces.core.TransactionReference;
  20 import org.mozartspaces.notifications.Notification;
  21 import org.mozartspaces.notifications.NotificationListener;
  22 import org.mozartspaces.notifications.Operation;
  23 import org.slf4j.Logger;
  24 import org.slf4j.LoggerFactory;
  25
  26 import at.ac.tuwien.sbc.valesriegler.common.Util;
  27 import at.ac.tuwien.sbc.valesriegler.types.GroupData;
  28 import at.ac.tuwien.sbc.valesriegler.types.GroupState;
  29 import at.ac.tuwien.sbc.valesriegler.types.Order;
  30 import at.ac.tuwien.sbc.valesriegler.types.OrderStatus;
  31 import at.ac.tuwien.sbc.valesriegler.types.Pizza;
  32 import at.ac.tuwien.sbc.valesriegler.types.Table;
  33
  34 public class WaiterXVSM extends AbstractXVSMConnector {
  35         private static final Logger log = LoggerFactory.getLogger(WaiterXVSM.class);
  36         private final int waiterId;
  37
  38         public WaiterXVSM(int waiterId) {
  39                 super();
  40
  41                 this.waiterId = waiterId;
  42
  43                 freeTablesContainer = useContainer(Util.FREE_TABLES);
  44                 assignTableContainer = useContainer(Util.ASSIGN_TABLE);
  45                 takeOrderContainer = useContainer(Util.TAKE_ORDER);
  46                 orderTakenContainer = useContainer(Util.ORDER_TAKEN);
  47                 preparePizzasContainer = useContainer(Util.PREPARE_PIZZAS);
  48                 orderCompleteContainer = useContainer(Util.ORDER_COMPLETE);
  49                 deliverPizzasContainer = useContainer(Util.DELIVER_PIZZAS);
  50                 paymentRequestContainer = useContainer(Util.PAYMENT_REQUEST);
  51                 paymentDoneContainer = useContainer(Util.PAYMENT_DONE);
  52                 tableAssignedContainer = useContainer(Util.TABLE_ASSIGNED);
  53                 infoContainer = useContainer(Util.INFO);
  54         }
  55
  56         public void listenForFreeTable() {
  57                 SpaceListener listener = new SpaceListenerImpl(capi, freeTablesContainer, false) {
  58
  59                         @Override
  60                         void onEntriesWritten(List<? extends Serializable> entries) throws Exception {
  61
  62                                 List<Table> tables = castEntries(entries);
  63
  64                                 for (Table table : tables) {
  65
  66                                         TransactionReference tx = capi.createTransaction(
  67                                                         Util.SPACE_TRANSACTION_TIMEOUT,
  68                                                         URI.create(Util.SERVER_ADDR));
  69
  70                                         // Acquire a lock for the free table in the
  71                                         // FreeTableContainer
  72                                         int id = table.getId();
  73
  74                                         Table tableTemplate = new Table(id);
  75                                         try {
  76                                                 Table lockedFreeTable = takeMatchingEntity(tableTemplate,
  77                                                                 freeTablesContainer, tx, RequestTimeout.DEFAULT,
  78                                                                 String.format("There was no free table found with id %d", id));
  79
  80
  81                                                 GroupData groupTemplate = new GroupData();
  82                                                 GroupData lockedGroup = takeMatchingEntity(groupTemplate,
  83                                                                 assignTableContainer, tx, RequestTimeout.DEFAULT,
  84                                                                 "There is no group waiting for a table at the moment");
  85
  86                                                 assignGroupToTable(lockedGroup, lockedFreeTable, tx);
  87                                         } catch (Exception e) {
  88 //                                              log.info(e.getMessage());
  89                                         }
  90                                 }
  91                         }
  92                 };
  93
  94                 createNotification(listener, freeTablesContainer);
  95         }
  96
  97
  98
  99         public void listenForNewGuests() {
 100                 SpaceListener listener = new SpaceListenerImpl(capi, assignTableContainer) {
 101
 102                         @Override
 103                         void onEntriesWritten(List<? extends Serializable> entries)
 104                                         throws Exception {
 105                                 log.info("New guest groups have arrived");
 106
 107                                 List<GroupData> groups = castEntries(entries);
 108
 109                                 for (GroupData group : groups) {
 110
 111                                         TransactionReference tx = capi.createTransaction(
 112                                                 Util.SPACE_TRANSACTION_TIMEOUT,
 113                                                 URI.create(Util.SERVER_ADDR));
 114
 115                                         // Acquire a lock for the group in the
 116                                         // AssignTableContainer
 117                                         String groupNotFound = String.format("Group with id %d was already assigned a table by another waiter!", group.getId());
 118
 119                                         try {
 120                                                 GroupData lockedGroup = takeMatchingEntity(
 121                                                                 new GroupData(group.getId()),
 122                                                                 assignTableContainer, tx,
 123                                                                 RequestTimeout.DEFAULT, groupNotFound);
 124                                                 // Acquire a lock for one free table in the
 125                                                 // TablesContainer
 126                                                 String noFreeTable = String.format("No free table for group with id %d could be found", group.getId());
 127                                                 Table lockedFreeTable = takeMatchingEntity(new Table(null), freeTablesContainer, tx, RequestTimeout.DEFAULT,
 128                                                                 noFreeTable);
 129
 130                                                 assignGroupToTable(lockedGroup, lockedFreeTable, tx);
 131                                         } catch (Exception e) {
 132 //                                              log.info(e.getMessage());
 133                                         }
 134                                 }
 135                         }
 136                 };
 137
 138                 createNotification(listener, assignTableContainer);
 139         }
 140
 141         public void listenForPaymentRequest() {
 142                 SpaceListener paymentListener = new SpaceListenerImpl(capi, paymentRequestContainer) {
 143
 144                         @Override
 145                         void onEntriesWritten(List<? extends Serializable> entries)
 146                                         throws Exception {
 147
 148                                 List<GroupData> groups = castEntries(entries);
 149
 150                                 for (GroupData groupData : groups) {
 151                                         TransactionReference tx = capi.createTransaction(
 152                                                         Util.SPACE_TRANSACTION_TIMEOUT,
 153                                                         URI.create(Util.SERVER_ADDR));
 154                                         GroupData entity = new GroupData(groupData.getId());
 155
 156                                         // Acquire the lock so that another waiter can't do the same
 157                                         // thing!
 158                                         String paymentRequestTakenByOtherWaiter = String.format(
 159                                                         "The payment request for group %d was already taken by an other waiter!",
 160                                                         groupData.getId());
 161                                         try {
 162                                                 takeMatchingEntity(entity, paymentRequestContainer, tx, RequestTimeout.DEFAULT, paymentRequestTakenByOtherWaiter);
 163
 164                                                 groupData.setPayingWaiter(waiterId);
 165
 166                                                 sendItemsToContainer(Arrays.asList(groupData), paymentDoneContainer, RequestTimeout.ZERO, tx);
 167
 168                                                 capi.commitTransaction(tx);
 169                                         } catch (Exception e) {
 170 //                                              log.info(e.getMessage());
 171                                         }
 172                                 }
 173                         }
 174                 };
 175
 176                 createNotification(paymentListener, paymentRequestContainer);
 177         }
 178
 179         public void listenForOrderRequests() {
 180                 SpaceListener ordersListener = new SpaceListenerImpl(capi, takeOrderContainer) {
 181
 182                         @Override
 183                         void onEntriesWritten(List<? extends Serializable> entries)
 184                                         throws Exception {
 185
 186                                 List<GroupData> groups = castEntries(entries);
 187
 188                                 for (GroupData groupData : groups) {
 189
 190                                         TransactionReference tx = capi.createTransaction(
 191                                                         Util.SPACE_TRANSACTION_TIMEOUT,
 192                                                         URI.create(Util.SERVER_ADDR));
 193                                         GroupData entity = new GroupData(groupData.getId());
 194                                         entity.setState(GroupState.SITTING);
 195
 196                                         try {
 197                                                 // Acquire the lock so that another waiter can't do the same thing!
 198                                                 String orderTakenByOtherWaiter = String.format(
 199                                                                 "The order for group %d was already taken by an other waiter!",
 200                                                                 groupData.getId());
 201                                                 takeMatchingEntity(entity, takeOrderContainer, tx, RequestTimeout.DEFAULT, orderTakenByOtherWaiter);
 202
 203                                                 groupData.setOrderWaiter(waiterId);
 204                                                 groupData.setState(GroupState.ORDERED);
 205                                                 Order order = groupData.getOrder();
 206                                                 order.setStatus(OrderStatus.ORDERED);
 207
 208                         /*  get the id of the last order of the pizzeria and set the order accordingly and
 209                             update the space */
 210                         final OrderId orderId = takeMatchingEntity(new OrderId(null), infoContainer, tx, RequestTimeout.INFINITE, "The Order id object could not be taken from the space!");
 211                         final int id = orderId.getId();
 212                         order.setId(id+100);
 213                         sendItemsToContainer(Arrays.asList(new OrderId(id+1)), infoContainer, RequestTimeout.DEFAULT, tx);
 214
 215                         // send the order as a whole to the space
 216                                                 sendItemsToContainer(Arrays.asList(groupData),
 217                                 orderTakenContainer, RequestTimeout.ZERO, tx);
 218                                                 sendItemsToContainer(order.getOrderedPizzas(),
 219                                                                 preparePizzasContainer, RequestTimeout.ZERO, tx);
 220                                                 capi.commitTransaction(tx);
 221
 222                                                 log.info("Waiter has taken order from group {}",
 223                                                                 groupData.getId());
 224                                         } catch (Exception e) {
 225 //                                              log.info(e.getMessage());
 226                                         }
 227                                 }
 228                         }
 229                 };
 230
 231                 createNotification(ordersListener, takeOrderContainer);
 232         }
 233
 234         public void listenForPreparedPizzas() {
 235                 /**
 236                  * A waiter gets informed when a new pizza is complete. He takes the
 237                  * orderId of the pizza and looks up the corresponding order from which
 238                  * he gets the number of necessary pizzas of the order. He then tries to
 239                  * fetch all pizzas with the corresponding orderId and compares the
 240                  * number of those pizzas with the number of necessary pizzas. If all
 241                  * pizzas of an order are complete he then delivers them!
 242                  */
 243                 SpaceListener preparedPizzasListener = new SpaceListenerImpl(capi, deliverPizzasContainer) {
 244
 245                         @Override
 246                         void onEntriesWritten(List<? extends Serializable> entries)
 247                                         throws Exception {
 248
 249                                 List<Pizza> pizzas = castEntries(entries);
 250
 251                                 for (Pizza pizza : pizzas) {
 252                                         int orderId = pizza.getOrderId();
 253
 254                                         TransactionReference tx = capi.createTransaction(
 255                                                         Util.SPACE_TRANSACTION_TIMEOUT,
 256                                                         URI.create(Util.SERVER_ADDR));
 257
 258                                         try {
 259                                                 GroupData entity = new GroupData();
 260                                                 entity.setState(null);
 261                                                 Order order = new Order();
 262                                                 order.setId(orderId);
 263                                                 entity.setOrder(order);
 264
 265                                                 GroupData groupData = takeMatchingEntity(entity,
 266                                                                 orderTakenContainer, tx, RequestTimeout.DEFAULT,
 267                                                                 "Another waiter just checks if the order is complete");
 268                                                 int groupId = groupData.getId();
 269                                                 int numberOfPizzas = groupData.getOrder().getNumberOfPizzas();
 270
 271                                                 Pizza pizzaTemplate = new Pizza();
 272                                                 pizzaTemplate.setOrderId(orderId);
 273
 274                                                 List<Pizza> pizzasOfOrder = takeMatchingEntities(
 275                                                                 pizzaTemplate, deliverPizzasContainer, tx,
 276                                                                 RequestTimeout.DEFAULT,
 277                                                                 "Cannot take the pizzas from the deliverPizzasContainer");
 278
 279                                                 if (pizzasOfOrder.size() == numberOfPizzas) {
 280                                                         GroupData group = new GroupData();
 281                                                         group.setServingWaiter(waiterId);
 282                                                         Order completeOrder = new Order();
 283                                                         completeOrder.setId(orderId);
 284                                                         completeOrder.setGroupId(groupId);
 285                                                         group.setOrder(completeOrder);
 286                                                         sendItemsToContainer(Arrays.asList(group),
 287                                                                         orderCompleteContainer, RequestTimeout.DEFAULT,
 288                                                                         tx);
 289                                                         capi.commitTransaction(tx);
 290                                                 } else {
 291                                                         log.info("Not yet all pizzas prepared! Order with id "
 292                                                                         + orderId + " has " + numberOfPizzas
 293                                                                         + " pizzas, but only " + pizzasOfOrder.size()
 294                                                                         + " pizzas are ready by now!");
 295                                                         capi.rollbackTransaction(tx);
 296                                                 }
 297                                         } catch (NullPointerException e) {
 298
 299                                         } catch (Exception e) {
 300                                                 capi.rollbackTransaction(tx);
 301                                         }
 302                                 }
 303                         }
 304                 };
 305
 306                 createNotification(preparedPizzasListener, deliverPizzasContainer);
 307         }
 308
 309         private void assignGroupToTable(GroupData lockedGroup,
 310                         Table lockedFreeTable, TransactionReference tx)
 311                         throws MzsCoreException {
 312                 // The new group sits down at the table
 313                 lockedFreeTable.setGroupId(lockedGroup.getId());
 314
 315                 // The new group now wants to order
 316                 lockedGroup.setState(GroupState.SITTING);
 317                 lockedGroup.setTable(lockedFreeTable);
 318                 lockedGroup.setTableWaiter(waiterId);
 319
 320                 sendItemsToContainer(Arrays.asList(lockedFreeTable),
 321                                 tableAssignedContainer, RequestTimeout.ZERO, tx);
 322                 sendItemsToContainer(Arrays.asList(lockedGroup), takeOrderContainer,
 323                                 RequestTimeout.ZERO, tx);
 324
 325                 try {
 326                         capi.commitTransaction(tx);
 327                         log.info("Assigned table to group with groupId {}",
 328                                         lockedGroup.getId());
 329                 } catch (Exception e) {
 330                         log.info("Assigning a table to group with groupId {} failed",
 331                                         lockedGroup.getId());
 332                         log.info(e.getMessage());
 333                 }
 334         }
 335
 336 }