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Merge pull request #291 from DougSchmidt-AI/feature/PF-1365-NtdnRepor…
…tingTweaks PF-1365 - Minor tweaks
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73 changes: 73 additions & 0 deletions
73
Samples/DotNetSdk/ObservationReportExporter/SingleInstanceGuard.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| using System; | ||
| using System.Reflection; | ||
| using System.Threading; | ||
| using log4net; | ||
|
|
||
| namespace ObservationReportExporter | ||
| { | ||
| public class SingleInstanceGuard : IDisposable | ||
| { | ||
| // ReSharper disable once PossibleNullReferenceException | ||
| private static readonly ILog Log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType); | ||
|
|
||
| private Mutex InstanceMutex { get; set; } | ||
| public string Name { get; } | ||
| private bool ShouldRelease { get; set; } | ||
|
|
||
| public SingleInstanceGuard(string name) | ||
| { | ||
| Name = $"{ExeHelper.ExeName}.{name}"; | ||
| InstanceMutex = new Mutex(true, Name); | ||
| ShouldRelease = true; | ||
| } | ||
|
|
||
| public bool IsAnotherInstanceRunning() | ||
| { | ||
| try | ||
| { | ||
| var isAnotherInstanceRunning = !InstanceMutex.WaitOne(TimeSpan.Zero, true); | ||
|
|
||
| if (isAnotherInstanceRunning) | ||
| { | ||
| ShouldRelease = false; | ||
| } | ||
|
|
||
| return isAnotherInstanceRunning; | ||
| } | ||
| catch (AbandonedMutexException) | ||
| { | ||
| Log.Debug($"Previous run of the program did not clear the '{Name}' mutex cleanly."); | ||
|
|
||
| return false; | ||
| } | ||
| catch (Exception ex) | ||
| { | ||
| Log.Warn($"Error occurred while checking if the program is still running:'{ex.Message}'. Will continue."); | ||
| } | ||
|
|
||
| return false; | ||
| } | ||
|
|
||
| public void Dispose() | ||
| { | ||
| Release(); | ||
|
|
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| InstanceMutex?.Dispose(); | ||
| } | ||
|
|
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| private void Release() | ||
| { | ||
| if (!ShouldRelease) | ||
| return; | ||
|
|
||
| try | ||
| { | ||
| InstanceMutex?.ReleaseMutex(); | ||
| } | ||
| catch (Exception e) | ||
| { | ||
| Log.Warn($"Can't release mutex '{Name}': {e.Message}"); | ||
| } | ||
| } | ||
| } | ||
| } |