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Common/DTS.Common/Classes/Locking/SensorsLocking.cs

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+using DTS.Common.Events;
+using DTS.Common.SharedResource.Strings;
+using DTS.Common.Utilities.Logging;
+using Prism.Events;
+using Prism.Events;
+using Prism.Ioc;
+using System;
+using System.Collections.Generic;
+using System.Drawing.Text;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Windows.Interop;
+
+namespace DTS.Common.Classes.Locking
+{
+    public class SensorsLocking
+    {
+        private LockRecord[] _existingLocks = null;
+        private static readonly object MyLock = new object();
+
+        private CancellationTokenSource _cancellationTokenSource = null;
+        private readonly Task _updateTask = null;
+        private const int MAX_WAIT_TIME_MS = 10000;
+        /// <summary>
+        /// returns false if stop was not needed or failed
+        /// returns true if stop was completed
+        /// </summary>
+        /// <returns></returns>
+        private bool StopUpdating()
+        {
+            if (null == _cancellationTokenSource || null == _existingLocks) { return false; }
+            lock (MyLock)
+            {
+                _cancellationTokenSource.Cancel();
+                if (!_updateTask.Wait(MAX_WAIT_TIME_MS))
+                {
+                    APILogger.Log("Failed to stop updating locks");
+                    return false;
+                }
+            }
+            return true;
+        }
+        public void Unlock(bool bCheckLock, string userName, int userId)
+        {
+            if (!StopUpdating()) { return; }
+
+            lock (MyLock)
+            {
+                if (null == _existingLocks || 0 == _existingLocks.Length) { return; }
+            }
+            try
+            {
+                FreeLocks();                
+            }
+            catch (Exception ex) { APILogger.Log(ex); }
+        }
+        private void FreeLocks()
+        {
+            LockRecord[] locks;
+            lock (MyLock)
+            {
+                if (null == _existingLocks || 0 == _existingLocks.Length) { return; }
+                locks = _existingLocks.ToArray();
+            }
+            foreach( var record in locks)
+            {
+                try
+                {
+                    LockManager.FreeLoc
+                }
+                catch(Exception ex) { APILogger.Log(ex); }
+            }
+        }
+        private bool CheckLock(bool publishErrors, string userName, int userId, LockRecord lockRecord, out LockError lockError)
+        {
+            throw new NotImplementedException();
+        }
+        /// <summary>
+        /// performs an immediate update of locks, publishes an error if the lock could not be updated
+        /// </summary>
+        /// <param name="publishErrors">whether to publish when there's an error or not</param>
+        /// <returns></returns>
+        private bool CheckLocks(bool publishErrors, string userName, int userId)
+        {
+            try
+            {
+                LockRecord[] records;
+                lock (MyLock)
+                {
+                    //FB 18006 Prevent null reference exception 
+                    if (_existingLocks == null || 0 == _existingLocks.Length)
+                    {
+                        APILogger.Log("_existingLock is null");
+                        return false;
+                    }
+                    //create a local copy of the locks so we can update them without the lock
+                    records = _existingLocks.ToArray();
+                }
+                var failed = new List<LockRecord>();
+                var errors = new List<LockError>();
+                foreach (var record in records)
+                {
+                    LockError lockError;
+                    if (!CheckLock(publishErrors, userName, userId, record, out lockError))
+                    {
+                        failed.Add(record);
+                        errors.Add(lockError);
+                    }
+                }
+                if (failed.Any() && errors.Any())
+                {
+                    if (publishErrors)
+                    {                        
+                        var msg = GetErrorMessage(errors.ToArray(), records.ToArray());
+                        var eventAggregator = ContainerLocator.Container.Resolve<IEventAggregator>();
+                        eventAggregator.GetEvent<PageErrorEvent>().Publish(new PageErrorArg(new[] { msg }, null));                        
+                    }
+                    //if we failed to update ANY of them we need to wipe out our selection
+                    lock (MyLock)
+                    {
+                        _existingLocks = new LockRecord[0];
+                    }
+                    WipeOutChanges();
+                    return false;
+                }
+                return true;
+            }
+            catch (Exception ex)
+            {
+                APILogger.Log(ex);
+                if (publishErrors)
+                {
+                    var eventAggregator = ContainerLocator.Container.Resolve<IEventAggregator>();
+                    eventAggregator.GetEvent<PageErrorEvent>().Publish(new PageErrorArg(
+                        new[] { $"{StringResources.FailedToUpdateLock}, {ex.Message}" }, null));
+                }
+                _cancellationTokenSource?.Cancel();
+                lock (MyLock)
+                {
+                    _existingLocks = new LockRecord[0];
+                }
+                return false;
+            }
+        }
+        private void WipeOutChanges()
+        {
+            throw new NotImplementedException();
+        }
+        private static string GetErrorMessage(LockError[] errors, LockRecord[] lockRecords )
+        {
+            StringBuilder sb = new StringBuilder(0);            
+
+            for( var i = 0; i < errors.Length && i < lockRecords.Length; i ++)
+            {
+                var error = errors[i];
+                var record = lockRecords[i];
+                if (error.LockStolen)
+                {
+                    sb.AppendLine(string.Format(StringResources.LockStolen_Sensors, record.ItemKey, error.LockingUser, error.LockingMachine));
+                }
+                else if(error.LockLost)
+                {
+                    sb.AppendLine(string.Format(StringResources.LockLost_Sensors, record.ItemKey));
+                }
+                else
+                {
+                    sb.AppendLine($"{StringResources.FailedToUpdateLock} - {record.ItemKey}");
+                }
+            }
+            return sb.ToString();
+        }
+        /// <summary>
+        /// returns true if the lockrecord matches the sensor currently locked in this control
+        /// 14340 sensor lost/locked - unlocked on sensor import
+        /// </summary>
+        /// <param name="lockRecord"></param>
+        /// <returns></returns>
+        public bool IsCurrentlyLocked(LockRecord lockRecord)
+        {
+            lock (MyLock)
+            {
+                if (null == _existingLocks) { return false; }
+
+                return Array.Exists(_existingLocks, x => x.ItemId == lockRecord.ItemId && x.ItemCategory == lockRecord.ItemCategory);
+            }
+        }
+    }
+}