LogStore.SetArchiveTail(SequenceNumber) 方法

定义

设置存档尾数据的序列号。Sets the sequence number of the archive tail.

public:
 void SetArchiveTail(System::IO::Log::SequenceNumber archiveTail);
public void SetArchiveTail (System.IO.Log.SequenceNumber archiveTail);
member this.SetArchiveTail : System.IO.Log.SequenceNumber -> unit
Public Sub SetArchiveTail (archiveTail As SequenceNumber)

参数

archiveTail
SequenceNumber

存档尾数据的序列号。The sequence number of the archive tail.

例外

archiveTail 不在此序列的基序列号和最后一个序列号之间。archiveTail is not between the base and last sequence numbers of this sequence.

archiveTail 对此序列无效。archiveTail is not valid for this sequence.

执行了无效的操作。An invalid operation has been executed.

创建存档快照时发生 I/O 错误。An I/O error occurs when creating the archive snapshot.

日志存储区不可存档。The log store is not archivable.

该方法是在序列已释放之后调用的。The method was called after the sequence has been disposed of.

没有足够的内存来继续执行程序。There is not enough memory to continue the execution of a program.

操作系统拒绝了对指定的日志存储区的访问。Access for the specified log store is denied by the operating system.

示例

下面的示例演示如何将 LogStore 存档到 XML 文档。The following example shows how to archive a LogStore to an XML document.

class LogBackup
{ 
    static void ArchiveToXML(LogStore logStore, string fileName) 
    {  
        LogArchiveSnapshot snapshot = logStore.CreateLogArchiveSnapshot();
        
        XmlTextWriter writer = new XmlTextWriter(fileName, Encoding.ASCII);
        
        writer.WriteStartElement("logArchive");
        foreach(FileRegion region in snapshot.ArchiveRegions) 
        {
            writer.WriteStartElement("fileRegion"); 
            writer.WriteElementString("path", region.Path); 
            writer.WriteElementString("length", region.FileLength.ToString()); 
            writer.WriteElementString("offset", region.Offset.ToString()); 
            using(Stream dataStream = region.GetStream()) 
            { 
                byte[] data = new byte[dataStream.Length]; 
                dataStream.Read(data, 0, data.Length); 
                writer.WriteElementString("data", Convert.ToBase64String(data)); 
            }
            writer.WriteEndElement();
        }
        writer.WriteEndElement(); 
        writer.Close(); 
        logStore.SetArchiveTail(snapshot.LastSequenceNumber); 
    }
    static void RestoreFromXML(string fileName) 
    { 
        using(XmlTextReader reader = new XmlTextReader(fileName)) 
        {
            reader.ReadStartElement("logArchive"); 
            while(reader.IsStartElement()) 
            { 
                string path = reader.ReadElementString("path"); 
                long length = Int64.Parse(reader.ReadElementString("length")); 
                long offset = Int64.Parse(reader.ReadElementString("offset")); 
                string dataString = reader.ReadElementString("data"); 
                byte[] data = Convert.FromBase64String(dataString); 
                FileStream fileStream;
                using(fileStream = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write)) 
                { 
                    fileStream.SetLength(length); 
                    fileStream.Position = offset; fileStream.Write(data, 0, data.Length); 
                }
            } 
        reader.ReadEndElement(); 
        } 
    } 
}
Friend Class LogBackup
    Private Shared Sub ArchiveToXML(ByVal logStore As LogStore, ByVal fileName As String)
        Dim snapshot As LogArchiveSnapshot = logStore.CreateLogArchiveSnapshot()

        Dim writer As New XmlTextWriter(fileName, Encoding.ASCII)

        writer.WriteStartElement("logArchive")
        For Each region As FileRegion In snapshot.ArchiveRegions
            writer.WriteStartElement("fileRegion")
            writer.WriteElementString("path", region.Path)
            writer.WriteElementString("length", region.FileLength.ToString())
            writer.WriteElementString("offset", region.Offset.ToString())
            Using dataStream As Stream = region.GetStream()
                Dim data(dataStream.Length - 1) As Byte
                dataStream.Read(data, 0, data.Length)
                writer.WriteElementString("data", Convert.ToBase64String(data))
            End Using
            writer.WriteEndElement()
        Next region
        writer.WriteEndElement()
        writer.Close()
        logStore.SetArchiveTail(snapshot.LastSequenceNumber)

    End Sub
    Private Shared Sub RestoreFromXML(ByVal fileName As String)
        Using reader As New XmlTextReader(fileName)
            reader.ReadStartElement("logArchive")
            Do While reader.IsStartElement()
                Dim path = reader.ReadElementString("path")
                Dim length = Int64.Parse(reader.ReadElementString("length"))
                Dim offset = Int64.Parse(reader.ReadElementString("offset"))
                Dim dataString = reader.ReadElementString("data")
                Dim data() = Convert.FromBase64String(dataString)
                Dim fileStream As FileStream
                fileStream = New FileStream(path, FileMode.OpenOrCreate, FileAccess.Write)
                Using fileStream
                    fileStream.SetLength(length)
                    fileStream.Position = offset
                    fileStream.Write(data, 0, data.Length)
                End Using
            Loop
            reader.ReadEndElement()
        End Using
    End Sub
End Class

注解

基序列号和存档尾数据中的较小者决定日志的尾数据。The smaller of the base sequence number and the archive tail determines the tail of the log.

适用于