filelogtracelistener.vb

大名鼎鼎的mono是.NET平台的跨平台（支持linux

'
' FileLogTraceListener.vb
'
' Authors:
'   Rolf Bjarne Kvinge ([e-mail]>
'
' Copyright (C) 2007 Novell (http://www.novell.com)
'
' Permission is hereby granted, free of charge, to any person obtaining
' a copy of this software and associated documentation files (the
' "Software"), to deal in the Software without restriction, including
' without limitation the rights to use, copy, modify, merge, publish,
' distribute, sublicense, and/or sell copies of the Software, and to
' permit persons to whom the Software is furnished to do so, subject to
' the following conditions:
' 
' The above copyright notice and this permission notice shall be
' included in all copies or substantial portions of the Software.
' 
' THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
' EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
' MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
' NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
' LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
' OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
' WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
'
#If NET_2_0 Then
Imports System.Runtime.InteropServices
Imports System.Text

Namespace Microsoft.VisualBasic.Logging
    <ComVisible(False)> _
    Public Class FileLogTraceListener
        Inherits TraceListener

        Private m_Append As Boolean
        Private m_AutoFlush As Boolean
        Private m_BaseFileName As String
        Private m_CustomLocation As String
        Private m_Delimiter As String
        Private m_DiskSpaceExhaustedBehaviour As DiskSpaceExhaustedOption
        Private m_Encoding As System.Text.Encoding
        Private m_IncludeHostName As Boolean
        Private m_Location As LogFileLocation
        Private m_LogFileCreationSchedule As LogFileCreationScheduleOption
        Private m_MaxFileSize As Long
        Private m_ReserveDiskSpace As Long

        Private m_Stream As System.IO.StreamWriter
        Private m_SupportedAttributes As String()

        Public Sub New()
            Me.New("FileLogTraceListener")
        End Sub

        Public Sub New(ByVal name As String)
            MyBase.New(name)

            m_Append = True
            m_AutoFlush = False
#If TARGET_JVM = False Then 'Windows.Forms Not Supported by Grasshopper
            m_BaseFileName = System.IO.Path.GetFileNameWithoutExtension(System.Windows.Forms.Application.ExecutablePath)
            m_CustomLocation = Microsoft.VisualBasic.FileIO.SpecialDirectories.CurrentUserApplicationData
#End If
            m_Delimiter = Constants.vbTab
            m_DiskSpaceExhaustedBehaviour = DiskSpaceExhaustedOption.DiscardMessages
            m_Encoding = System.Text.Encoding.UTF8
            m_IncludeHostName = False
            m_Location = LogFileLocation.LocalUserApplicationDirectory
            m_LogFileCreationSchedule = LogFileCreationScheduleOption.None
            m_MaxFileSize = 5000000
            m_ReserveDiskSpace = 10000000
        End Sub

        Public Overrides Sub Close()
            MyBase.Close()
            m_Stream.Close()
            m_Stream = Nothing
        End Sub

        Protected Overrides Sub Dispose(ByVal disposing As Boolean)
            If m_Stream IsNot Nothing Then
                m_Stream.Dispose()
                m_Stream = Nothing
            End If
        End Sub

        Public Overrides Sub Flush()
            m_Stream.Flush()
            MyBase.Flush()
        End Sub

        Protected Overrides Function GetSupportedAttributes() As String()
            If m_SupportedAttributes Is Nothing Then
                m_SupportedAttributes = New String() {"append", "Append", "autoflush", "AutoFlush", "autoFlush", "basefilename", "BaseFilename", "baseFilename", "BaseFileName", "baseFileName", "customlocation", "CustomLocation", "customLocation", "delimiter", "Delimiter", "diskspaceexhaustedbehavior", "DiskSpaceExhaustedBehavior", "diskSpaceExhaustedBehavior", "encoding", "Encoding", "includehostname", "IncludeHostName", "includeHostName", "location", "Location", "logfilecreationschedule", "LogFileCreationSchedule", "logFileCreationSchedule", "maxfilesize", "MaxFileSize", "maxFileSize", "reservediskspace", "ReserveDiskSpace", "reserveDiskSpace"}
            End If
            Return m_SupportedAttributes
        End Function

        Public Overrides Sub TraceData(ByVal eventCache As TraceEventCache, ByVal source As String, ByVal eventType As TraceEventType, ByVal id As Integer, ByVal data As Object)
            If data Is Nothing Then
                TraceEvent(eventCache, source, eventType, id, String.Empty)
            Else
                TraceEvent(eventCache, source, eventType, id, data.ToString)
            End If
        End Sub

        Public Overrides Sub TraceData(ByVal eventCache As TraceEventCache, ByVal source As String, ByVal eventType As TraceEventType, ByVal id As Integer, ByVal ParamArray data As Object())
            If data Is Nothing Then
                TraceEvent(eventCache, source, eventType, id, String.Empty)
            Else
                TraceEvent(eventCache, source, eventType, id, Microsoft.VisualBasic.Join(data, m_Delimiter))
            End If
        End Sub

#If TARGET_JVM = False Then            
        Public Overrides Sub TraceEvent(ByVal eventCache As TraceEventCache, ByVal source As String, ByVal eventType As TraceEventType, ByVal id As Integer, ByVal message As String)

	    If Me.Filter IsNot Nothing AndAlso Me.Filter.ShouldTrace(eventCache, source, eventType, id, message, Nothing, Nothing, Nothing) = False Then Return

            Dim builder As New System.Text.StringBuilder()
            builder.Append(source)
            builder.Append(m_Delimiter)
            builder.Append(eventType.ToString())
            builder.Append(m_Delimiter)
            builder.Append(id.ToString)
            builder.Append(m_Delimiter)
            builder.Append(message)
            If CBool(Me.TraceOutputOptions And TraceOptions.Callstack) Then
                builder.Append(m_Delimiter)
                builder.Append(eventCache.Callstack)
            End If
            If CBool(Me.TraceOutputOptions And TraceOptions.LogicalOperationStack) Then
                builder.Append(m_Delimiter)
                builder.Append("""")
                For Each item As Object In eventCache.LogicalOperationStack
                    builder.Append(eventCache.ToString)
                Next
                builder.Append("""")
            End If
            If CBool(Me.TraceOutputOptions And TraceOptions.DateTime) Then
                builder.Append(m_Delimiter)
                builder.Append(eventCache.DateTime.ToString("u", System.Globalization.CultureInfo.InvariantCulture))
            End If
            If CBool(Me.TraceOutputOptions And TraceOptions.ProcessId) Then
                builder.Append(m_Delimiter)
                builder.Append(eventCache.ProcessId)
            End If
            If CBool(Me.TraceOutputOptions And TraceOptions.ThreadId) Then
                builder.Append(m_Delimiter)
                builder.Append(eventCache.ThreadId)
            End If
            If CBool(Me.TraceOutputOptions And TraceOptions.Timestamp) Then
                builder.Append(m_Delimiter)
                builder.Append(eventCache.Timestamp)
            End If
            If m_IncludeHostName Then
                builder.Append(m_Delimiter)
                builder.Append(Environment.MachineName)
            End If
            WriteLine(builder.ToString)
        End Sub
#End If

        Public Overrides Sub TraceEvent(ByVal eventCache As TraceEventCache, ByVal source As String, ByVal eventType As TraceEventType, ByVal id As Integer, ByVal format As String, ByVal ParamArray args As Object())
            If args Is Nothing Then
                TraceEvent(eventCache, source, eventType, id, format)
            Else
                TraceEvent(eventCache, source, eventType, id, String.Format(format, args))
            End If
        End Sub


        Public Overloads Overrides Sub Write(ByVal message As String)
            Dim stream As System.IO.StreamWriter
            stream = GetOpenStream()

            If CheckSpace(message.Length) = False Then Return

            stream.Write(message)

            If m_AutoFlush Then stream.Flush()
        End Sub

        Public Overloads Overrides Sub WriteLine(ByVal message As String)
            Dim stream As System.IO.StreamWriter
            stream = GetOpenStream()

            If CheckSpace(message.Length + System.Environment.NewLine.Length) = False Then Return