Filesystem: Clean up

2020-12-17 13:36:40 +01:00
parent ebf53ea108
commit 99e5675d51
10 changed files with 9 additions and 9 deletions
--- a/Modules.Filesystem/FileWatcher/FileWatcher.vb
+++ b/Modules.Filesystem/FileWatcher/FileWatcher.vb
@@ -0,0 +1,132 @@
+Imports System.IO
+Imports DigitalData.Modules.Filesystem
+Imports DigitalData.Modules.Filesystem.FileWatcherFilters
+Imports DigitalData.Modules.Logging
+
+
+Public Class FileWatcher
+    ' Internals
+    Private ReadOnly _Logger As Logger
+    Private ReadOnly _Watchers As List(Of FileSystemWatcher)
+    Private ReadOnly _Files As Dictionary(Of String, FileWatcherProperties)
+    Private ReadOnly _Filters As List(Of BaseFileFilter)
+
+    ' Options
+    Private _Path As String
+
+    ' Public Events
+    Public Event FileSaved(ByVal FullName As String, ByVal IsSpecial As Boolean)
+
+    Public Sub New(LogConfig As LogConfig, Path As String, Optional Filters As List(Of BaseFileFilter) = Nothing)
+        _Logger = LogConfig.GetLogger()
+        _Files = New Dictionary(Of String, FileWatcherProperties)
+        _Watchers = New List(Of FileSystemWatcher)
+        _Filters = IIf(IsNothing(Filters), GetDefaultFilters(), Filters)
+        _Path = Path
+
+        For Each oFilePath In Directory.EnumerateFiles(_Path)
+            Try
+                If IO.File.Exists(oFilePath) Then
+                    _Files.Add(oFilePath, New FileWatcherProperties With {
+                        .CreatedAt = DateTime.Now,
+                        .ChangedAt = Nothing
+                    })
+                End If
+            Catch ex As Exception
+                _Logger.Error(ex)
+                _Logger.Warn("File {0} cannot be watched!")
+            End Try
+        Next
+    End Sub
+
+    Public Sub Add(Filter As String)
+        _Watchers.Add(CreateWatcher(Filter))
+    End Sub
+
+    Public Sub Start()
+        For Each oWatcher In _Watchers
+            oWatcher.EnableRaisingEvents = True
+        Next
+    End Sub
+
+    Public Sub [Stop]()
+        For Each oWatcher In _Watchers
+            If Not IsNothing(oWatcher) Then
+                oWatcher.EnableRaisingEvents = False
+                oWatcher.Dispose()
+            End If
+        Next
+    End Sub
+
+    Private Function GetDefaultFilters()
+        Return New List(Of BaseFileFilter) From {
+              New TempFileFilter,
+              New OfficeFileFilter
+        }
+    End Function
+
+    Private Function CreateWatcher(Filter As String)
+        Dim oWatcher = New FileSystemWatcher() With {
+            .Path = _Path,
+            .Filter = Filter,
+            .NotifyFilter = NotifyFilters.LastAccess _
+                            Or NotifyFilters.LastWrite _
+                            Or NotifyFilters.FileName _
+                            Or NotifyFilters.Size _
+                            Or NotifyFilters.FileName _
+                            Or NotifyFilters.Attributes
+        }
+
+        AddHandler oWatcher.Created, AddressOf HandleFileCreated
+        AddHandler oWatcher.Changed, AddressOf HandleFileChanged
+        AddHandler oWatcher.Deleted, AddressOf HandleFileDeleted
+        AddHandler oWatcher.Renamed, AddressOf HandleFileRenamed
+
+        Return oWatcher
+    End Function
+
+    Private Sub HandleFileCreated(sender As Object, e As FileSystemEventArgs)
+        _Files.Add(e.FullPath, New FileWatcherProperties())
+        _Logger.Debug("[Created] " & e.FullPath)
+    End Sub
+
+    ''' <summary>
+    ''' This may fire twice for a single save operation, 
+    ''' see: https://blogs.msdn.microsoft.com/oldnewthing/20140507-00/?p=1053/
+    ''' </summary>
+    Private Sub HandleFileChanged(sender As Object, e As FileSystemEventArgs)
+        _Files.Item(e.FullPath).ChangedAt = DateTime.Now
+        _Logger.Debug("[Changed] " & e.FullPath)
+
+        Dim oShouldRaiseSave As Boolean = Not _Filters.Any(Function(oFilter)
+                                                               Return oFilter.ShouldFilter(e)
+                                                           End Function)
+
+        If oShouldRaiseSave Then
+            RaiseEvent FileSaved(e.FullPath, False)
+        End If
+    End Sub
+    Private Sub HandleFileDeleted(sender As Object, e As FileSystemEventArgs)
+        _Files.Remove(e.FullPath)
+        _Logger.Debug("[Removed] " & e.FullPath)
+    End Sub
+
+    Private Sub HandleFileRenamed(sender As Object, e As RenamedEventArgs)
+        Dim oProperties = _Files.Item(e.OldFullPath)
+        _Files.Remove(e.OldFullPath)
+        _Files.Add(e.FullPath, oProperties)
+        ' Soll eine umbenannte datei als NEU gelten?
+
+        Dim oShouldRaiseSave = _Filters.Any(Function(oFilter)
+                                                Return oFilter.ShouldRaiseSave(e)
+                                            End Function)
+
+        If oShouldRaiseSave Then
+            RaiseEvent FileSaved(e.OldFullPath, True)
+        End If
+
+        _Logger.Debug("[Renamed] {0} --> {1}", e.OldFullPath, e.FullPath)
+    End Sub
+
+
+End Class