Ejemplo n.º 1
0
 public LockMessage(String loginName, bool isLocked, LockBatch batch)
 {
     msgType = NotificationMessage.MessageType.LockMessage;
     lockBatch = batch;
     this.loginName = loginName;
     this.isLocked = isLocked;
 }
Ejemplo n.º 2
0
 /// <summary>
 /// Tries to lock the items passed in LockBatch.
 /// </summary>
 /// <param name="login">The login of the user is our transaction id</param>
 /// <param name="batch">The items to lock</param>
 /// <param name="mode">The lock mode</param>
 /// <returns>True on lock success, false on rollback</returns>
 public bool Lock(String login, LockBatch batch, LockMode mode)
 {
     lock(locks)
     {
         foreach (LockItem item in batch.ItemsToLock)
         {
             if (SetLocks(login, batch, mode, item) == false)
             {
                 return false;
             }
         }
         return true;
     }
 }
Ejemplo n.º 3
0
 /// <summary>
 /// Unlock the locks for given user and mode.
 /// </summary>
 /// <param name="login">The login name of the user the unlock should be processed for</param>
 /// <param name="batch">The items to unlock</param>
 /// <param name="mode">The lock mode to unlock</param>
 /// <returns>True on all items could be unlocked. False if unlocking of at least one item has failed.</returns>
 public bool Unlock(String login, LockBatch batch, LockMode mode)
 {
     lock(locks)
     {
         bool allLocksReleased = true;
         foreach (LockItem item in batch.ItemsToLock)
         {
             if (ReleaseLocks(login, mode, item) == false)
             {
                 allLocksReleased = false;
             }
         }
         return allLocksReleased;
     }
 }
Ejemplo n.º 4
0
        public LockBatch GetCurrentLocks(string loginName)
        {
            LockBatch batch = new LockBatch();

            lock(locks)
            {
                LockItem cpLockItem = new LockItem();
                cpLockItem.ItemType = ResourceMap.ModelTypeToItemType<CollectionPoint>();
                cpLockItem.IDsToLock = locks.GetLockedIdsForItemType(cpLockItem.ItemType, loginName, LockMode.Locked);

                LockItem cLocks = new LockItem();
                cLocks.ItemType = ResourceMap.ModelTypeToItemType<Customer>();
                cLocks.IDsToLock = locks.GetLockedIdsForItemType(cLocks.ItemType, loginName, LockMode.Locked);

                batch.ItemsToLock = new List<LockItem>(new LockItem[] { cpLockItem, cLocks });
            }

            return batch;
        }
Ejemplo n.º 5
0
        public LockBatch GetItemsToLock(int id)
        {
            Console.WriteLine("Customer Strategy called.");

            LockBatch batch = new LockBatch();
            LockItem lockItem = new LockItem();
            lockItem.ItemType = ItemType.CollectionPoint;
            lockItem.IDsToLock = new List<int>(new int[] { 1, 2, 3 });
            LockItem lockItem2 = new LockItem();
            lockItem2.ItemType = ItemType.Customer;
            List<int> aLotOfIds = new List<int>();
            for (int i = 1; i < 30; i++)
            {
                aLotOfIds.Add(i);
            }
            lockItem2.IDsToLock = aLotOfIds;
            batch.ItemsToLock = new List<LockItem>(new LockItem[] { lockItem, lockItem2 });
            return batch;
        }
Ejemplo n.º 6
0
        public LockBatch GetItemsToLock(int id)
        {
            Console.WriteLine("CollectionPoint lock strategy for id: {0} called.", id);

            ResourceCache currentItems = tm.Cache;
            List<CollectionPoint> allCollectionPoints = currentItems.GetAllItems<CollectionPoint>();
            List<Customer> allCustomers = currentItems.GetAllItems<Customer>();

            LockItem cpLockItem = new LockItem();
            cpLockItem.ItemType = ItemType.CollectionPoint;
            cpLockItem.IDsToLock = new List<int>();

            LockItem customerLockItem = new LockItem();
            customerLockItem.ItemType = ItemType.Customer;
            customerLockItem.IDsToLock = new List<int>();

            LockBatch batch = new LockBatch();

            CollectionPoint targetItem = currentItems.GetItem<CollectionPoint>(id);
            if(targetItem != null)
            {
                batch.ItemsToLock = new List<LockItem>(new LockItem[] { cpLockItem, customerLockItem });

                cpLockItem.IDsToLock.Add(id); //root id of the lock request

                // get the customers
                List<Customer> targetCustomers = targetItem.Customers;

                // add the customers of target item first
                foreach(Customer currentCustomer in targetCustomers)
                {
                    customerLockItem.IDsToLock.Add(currentCustomer.Id);
                }

                // go over the other CollectionPoints and get the dependencies
                int oldCustomerCount = -1;

                //TODO: do we need to observe oldCollectionPoint count too?

                do
                {
                    oldCustomerCount = customerLockItem.IDsToLock.Count;

                    foreach(CollectionPoint currentCollectionPoint in allCollectionPoints)
                    {
                        if(cpLockItem.IDsToLock.Contains(currentCollectionPoint.Id) == false)
                        {
                            bool dependencyExists = false;
                            List<int> customerIdsOfCurrentCP = new List<int>();
                            //check if this collection point contains at least one customer with
                            //which is allready marked as locked
                            foreach(Customer currentCustomer in currentCollectionPoint.Customers)
                            {
                                customerIdsOfCurrentCP.Add(currentCustomer.Id);
                                if(customerLockItem.IDsToLock.Contains(currentCustomer.Id))
                                {
                                    dependencyExists = true;
                                }
                            }
                            if(dependencyExists == true)
                            {
                                // if new dependency found we need to add the CollectionPoint
                                // and the customer not allready marked to be locked
                                foreach(int customerId in customerIdsOfCurrentCP)
                                {
                                    if(customerLockItem.IDsToLock.Contains(customerId) == false)
                                    {
                                        customerLockItem.IDsToLock.Add(customerId);
                                    }
                                }
                                cpLockItem.IDsToLock.Add(currentCollectionPoint.Id);
                            }
                        }
                    }
                } while (oldCustomerCount.Equals(customerLockItem.IDsToLock.Count) == false);
            }
            else
            {
                Console.WriteLine("CollectionPoint root item: {0} isn't cached by the data source!", id);
                batch.ItemsToLock = null;
            }

            return batch;
        }
Ejemplo n.º 7
0
        private bool SetLocks(String login, LockBatch batch, LockMode mode, LockItem item)
        {
            foreach (int id in item.IDsToLock)
            {
                List<LockData> currentLocks = locks.GetLocksForItem(id, item.ItemType);
                LockData newLock = new LockData(login, mode);

                // for future write-lock development
                // we have to pass currentLocks as a whole to assure that ll
                // for this user are present in currentLocks
                // write locks can only be set if the ll for this user are set

                foreach(LockData lockData in currentLocks)
                {
                    if(newLock.Equals(lockData) == false
                        && !LockMatrix.IsModeCompatible(lockData.mode, mode))
                    {
                        Console.WriteLine("Lock conflict, rollback locks for user: {0}", login);
                        Unlock(login, batch, mode);
                        return false;
                    }
                }
                if(currentLocks.Contains(newLock) == false)
                {
                    currentLocks.Add(newLock);
                    locks.UpdateLocksForItem(id, item.ItemType, currentLocks);
                }
            }
            return true;
        }