From d74d21c1ef5c908aa98d7d067a94812a97257cfa Mon Sep 17 00:00:00 2001
From: Roy Ben Shabat <Roy.mail.net@gmail.com>
Date: Tue, 21 Apr 2020 00:59:11 +0300
Subject: Several PPC bug fixes.

---
 .../Connection/DefaultMachineProvider.cs           | 57 ++++++++++++++++++++++
 .../Connection/IMachineProvider.cs                 | 15 ++++++
 2 files changed, 72 insertions(+)

(limited to 'Software/Visual_Studio/PPC/Tango.PPC.Common/Connection')

diff --git a/Software/Visual_Studio/PPC/Tango.PPC.Common/Connection/DefaultMachineProvider.cs b/Software/Visual_Studio/PPC/Tango.PPC.Common/Connection/DefaultMachineProvider.cs
index 1c0c52196..9fe6d24bd 100644
--- a/Software/Visual_Studio/PPC/Tango.PPC.Common/Connection/DefaultMachineProvider.cs
+++ b/Software/Visual_Studio/PPC/Tango.PPC.Common/Connection/DefaultMachineProvider.cs
@@ -36,6 +36,26 @@ namespace Tango.PPC.Common.Connection
         private ObservablesContext _context;
         private bool disableConnectionFileLogging;
 
+        /// <summary>
+        /// Occurs when the machine has connected.
+        /// </summary>
+        public event EventHandler MachineConnected;
+
+        /// <summary>
+        /// Occurs when the machine has disconnected.
+        /// </summary>
+        public event EventHandler MachineDisconnected;
+
+        private bool _isConnected;
+        /// <summary>
+        /// Gets a value indicating whether the machine is currently connected.
+        /// </summary>
+        public bool IsConnected
+        {
+            get { return _isConnected; }
+            private set { _isConnected = value; RaisePropertyChangedAuto(); }
+        }
+
         private Machine _machine;
         /// <summary>
         /// Gets the database machine entity associated with the current machine.
@@ -78,6 +98,7 @@ namespace Tango.PPC.Common.Connection
             var settings = SettingsManager.Default.GetOrCreate<PPCSettings>();
 
             MachineOperator = new MachineOperator();
+            MachineOperator.StatusChanged += MachineOperator_StatusChanged;
             MachineOperator.EnableEventsNotification = true;
             MachineOperator.EnableJobResume = true;
             MachineOperator.UseKeepAlive = true;
@@ -101,6 +122,24 @@ namespace Tango.PPC.Common.Connection
             MachineOperator.EnableJobLiquidQuantityValidation = settings.EnableJobLiquidQuantityValidation;
         }
 
+        private void MachineOperator_StatusChanged(object sender, MachineStatuses status)
+        {
+            if (status != MachineStatuses.Disconnected)
+            {
+                if (!IsConnected)
+                {
+                    OnMachineConnected();
+                }
+            }
+            else
+            {
+                if (IsConnected)
+                {
+                    OnMachineConnected();
+                }
+            }
+        }
+
         private async void ConnectionThreadMethod()
         {
             while (true)
@@ -358,5 +397,23 @@ namespace Tango.PPC.Common.Connection
 
             return machineOperator;
         }
+
+        /// <summary>
+        /// Called when the machine has connected.
+        /// </summary>
+        protected virtual void OnMachineConnected()
+        {
+            IsConnected = true;
+            MachineConnected?.Invoke(this, new EventArgs());
+        }
+
+        /// <summary>
+        /// Called when the machine has disconnected.
+        /// </summary>
+        protected virtual void OnMachineDisconnected()
+        {
+            IsConnected = false;
+            MachineDisconnected?.Invoke(this, new EventArgs());
+        }
     }
 }
diff --git a/Software/Visual_Studio/PPC/Tango.PPC.Common/Connection/IMachineProvider.cs b/Software/Visual_Studio/PPC/Tango.PPC.Common/Connection/IMachineProvider.cs
index 10180b9cc..774fa7c9e 100644
--- a/Software/Visual_Studio/PPC/Tango.PPC.Common/Connection/IMachineProvider.cs
+++ b/Software/Visual_Studio/PPC/Tango.PPC.Common/Connection/IMachineProvider.cs
@@ -15,6 +15,21 @@ namespace Tango.PPC.Common.Connection
     /// </summary>
     public interface IMachineProvider
     {
+        /// <summary>
+        /// Occurs when the machine has connected.
+        /// </summary>
+        event EventHandler MachineConnected;
+
+        /// <summary>
+        /// Occurs when the machine has disconnected.
+        /// </summary>
+        event EventHandler MachineDisconnected;
+
+        /// <summary>
+        /// Gets a value indicating whether the machine is currently connected.
+        /// </summary>
+        bool IsConnected { get; }
+
         /// <summary>
         /// Gets the database machine entity associated with the current machine.
         /// </summary>
-- 
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