From c964053e9edded74b4f93b5f9974d42fa05607b2 Mon Sep 17 00:00:00 2001
From: Bill Long <bilong@microsoft.com>
Date: Wed, 24 May 2023 10:58:11 -0500
Subject: [PATCH] Enable watcher on background thread

---
 src/EventLogExpert/Store/EventLog/EventLogReducers.cs |  5 +++++
 src/EventLogExpert/Store/EventLog/LiveLogWatcher.cs   | 10 ++++++++--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/EventLogExpert/Store/EventLog/EventLogReducers.cs b/src/EventLogExpert/Store/EventLog/EventLogReducers.cs
index db45ca40..aa709aa3 100644
--- a/src/EventLogExpert/Store/EventLog/EventLogReducers.cs
+++ b/src/EventLogExpert/Store/EventLog/EventLogReducers.cs
@@ -96,6 +96,11 @@ public static EventLogState ReduceSetContinouslyUpdate(EventLogState state, Even
                 Events = state.NewEventBuffer.Events.Concat(state.Events).ToList().AsReadOnly(),
                 NewEventBuffer = new(new List<DisplayEventModel>().AsReadOnly(), false)
             };
+
+            if (state.Watcher != null && !state.Watcher.IsWatching)
+            {
+                state.Watcher.StartWatching();
+            }
         }
 
         return newState;
diff --git a/src/EventLogExpert/Store/EventLog/LiveLogWatcher.cs b/src/EventLogExpert/Store/EventLog/LiveLogWatcher.cs
index e95735b0..e68a90a3 100644
--- a/src/EventLogExpert/Store/EventLog/LiveLogWatcher.cs
+++ b/src/EventLogExpert/Store/EventLog/LiveLogWatcher.cs
@@ -64,9 +64,15 @@ public void StartWatching()
             }
         };
 
-        _watcher.Enabled = true;
+        // When the watcher is enabled, it reads all the events since the
+        // last bookmark. Do this on a background thread so we don't tie
+        // up the UI.
+        Task.Run(() =>
+        {
+            _watcher.Enabled = true;
 
-        _debugLogger.Trace("LiveLogWatcher started watching.");
+            _debugLogger.Trace("LiveLogWatcher started watching.");
+        });
     }
 
     public void StopWatching()