LogRecordSequence LogRecordSequence LogRecordSequence LogRecordSequence Class

Definición

Representa una secuencia de registro almacenada en un LogStore.Represents a record sequence stored in a LogStore.

public ref class LogRecordSequence sealed : IDisposable, System::IO::Log::IRecordSequence
public sealed class LogRecordSequence : IDisposable, System.IO.Log.IRecordSequence
type LogRecordSequence = class
    interface IRecordSequence
    interface IDisposable
Public NotInheritable Class LogRecordSequence
Implements IDisposable, IRecordSequence
Herencia
LogRecordSequenceLogRecordSequenceLogRecordSequenceLogRecordSequence
Implementaciones

Ejemplos

En este ejemplo se muestra cómo utilizar la clase LogRecordSequence.This example shows how to use the LogRecordSequence class:

using System;
using System.IO;
using System.Collections.Generic;
using System.Text;
using System.IO.Log;

namespace MyLogRecordSequence
{
    public class MyLog
    {
        string logName = "test.log";
        string logContainer = "MyExtent0";
        int containerSize = 32 * 1024;
        LogRecordSequence sequence = null;
        bool delete = true;

        // These are used in the TailPinned event handler.
        public static LogRecordSequence MySequence = null;
        public static bool AdvanceBase = true;

        public MyLog()
        {
            // Create a LogRecordSequence.
            sequence = new LogRecordSequence(this.logName,
                                              FileMode.CreateNew,
                                              FileAccess.ReadWrite,
                                              FileShare.None);

            // At least one container/extent must be added for Log Record Sequence.
            sequence.LogStore.Extents.Add(this.logContainer, this.containerSize);
     
            MySequence = sequence;

        }

        public void AddExtents()
        {
            // Add two additional extents. The extents are 
            // of the same size as the first extent.
            sequence.LogStore.Extents.Add("MyExtent1");
            sequence.LogStore.Extents.Add("MyExtent2");
        }

        public void EnumerateExtents()
        {
            LogStore store = sequence.LogStore;

            Console.WriteLine("Enumerating Log Extents...");
            Console.WriteLine("    Extent Count: {0} extents", store.Extents.Count);
            Console.WriteLine("    Extents Are...");
            foreach (LogExtent extent in store.Extents)
            {
                Console.WriteLine("      {0} ({1}, {2})",
                                  Path.GetFileName(extent.Path),
                                  extent.Size,
                                  extent.State);
            }
            Console.WriteLine("    Free Extents: {0} Free", store.Extents.FreeCount);   
        }

        public void SetLogPolicy()
        {
            Console.WriteLine();
            Console.WriteLine("Setting current log policy...");

            // SET LOG POLICY

            LogPolicy policy = sequence.LogStore.Policy;

            // Set AutoGrow policy. This enables the log to automatically grow
            // when the existing extents are full. New extents are added until
            // we reach the MaximumExtentCount extents.
            // AutoGrow policy is supported only in Windows Vista and not available in R2.
            
            //policy.AutoGrow = true;

            // Set the Growth Rate in terms of extents. This policy specifies
            // "how much" the log should grow. 
            policy.GrowthRate = new PolicyUnit(2, PolicyUnitType.Extents);

            // Set the AutoShrink policy. This enables the log to automatically
            // shrink if the available free space exceeds the shrink percentage. 
            // AutoGrow/shrink policy is supported only in Windows Vista and not available in R2.
            
            //policy.AutoShrinkPercentage = new PolicyUnit(30, PolicyUnitType.Percentage);

            // Set the PinnedTailThreshold policy.
            // A tail pinned event is triggered when there is no
            // log space available and log space may be freed by advancing the base.
            // The user must handle the tail pinned event by advancing the base of the log. 
            // If the user is not able to move the base of the log, the user should report with exception in
            // the tail pinned handler.
            // PinnedTailThreashold policy dictates the amount of space that the TailPinned event requests 
            // for advancing the base of the log. The amount of space can be in percentage or in terms of bytes 
            // which is rounded off to the nearest containers in CLFS. The default is 35 percent.

            
            policy.PinnedTailThreshold = new PolicyUnit(10, PolicyUnitType.Percentage);

            // Set the maximum extents the log can have.
            policy.MaximumExtentCount = 6;
            
            // Set the minimum extents the log can have.
            policy.MinimumExtentCount = 2;
            
            // Set the prefix for new containers that are added. 
            // when AutoGrow is enabled.
            //policy.NewExtentPrefix = "MyLogPrefix";
            
            // Set the suffix number for new containers that are added.
            // when AutoGrow is enabled. 
            policy.NextExtentSuffix = 3;

            // Commit the log policy.
            policy.Commit();

            // Refresh updates the IO.Log policy properties with current log policy 
            // set in the log. 
            policy.Refresh();

            // LOG POLICY END
            // 

            //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
            // Setting up IO.Log provided capabilities...
            // 

            // SET RETRY APPEND

            // IO.Log provides a mechanism similar to AutoGrow.
            // If the existing log is full and an append fails, setting RetryAppend
            // invokes the CLFS policy engine to add new extents and re-tries
            // record appends. If MaximumExtent count has been reached, 
            // a SequenceFullException is thrown. 
            // 

            sequence.RetryAppend = true;

            // RETRY APPEND END

            // REGISTER FOR TAILPINNED EVENT NOTIFICATIONS

            // Register for TailPinned Event by passing in an event handler.
            // An event is raised when the log full condition is reached.
            // The user should either advance the base sequence number to the 
            // nearest valid sequence number recommended in the tail pinned event or
            // report a failure that it is not able to advance the base sequence 
            // number. 
            //

            sequence.TailPinned += new EventHandler<TailPinnedEventArgs>(HandleTailPinned);  

            Console.WriteLine("Done...");
        }

        public void ShowLogPolicy()
        {
            Console.WriteLine();
            Console.WriteLine("Showing current log policy...");

            LogPolicy policy = sequence.LogStore.Policy;

            Console.WriteLine("    Minimum extent count:  {0}", policy.MinimumExtentCount);
            Console.WriteLine("    Maximum extent count:  {0}", policy.MaximumExtentCount);
            Console.WriteLine("    Growth rate:           {0}", policy.GrowthRate);
            Console.WriteLine("    Pinned tail threshold: {0}", policy.PinnedTailThreshold);
            Console.WriteLine("    Auto shrink percent:   {0}", policy.AutoShrinkPercentage);
            Console.WriteLine("    Auto grow enabled:     {0}", policy.AutoGrow);
            Console.WriteLine("    New extent prefix:     {0}", policy.NewExtentPrefix);
            Console.WriteLine("    Next extent suffix:    {0}", policy.NextExtentSuffix);

	}

        // Append records. Appending three records.  
        public void AppendRecords()
        {
            Console.WriteLine("Appending Log Records...");
            SequenceNumber previous = SequenceNumber.Invalid;

            previous = sequence.Append(CreateData("Hello World!"), SequenceNumber.Invalid, SequenceNumber.Invalid, RecordAppendOptions.ForceFlush);
            previous = sequence.Append(CreateData("This is my first Logging App"), SequenceNumber.Invalid, SequenceNumber.Invalid, RecordAppendOptions.ForceFlush);
            previous = sequence.Append(CreateData("Using LogRecordSequence..."), SequenceNumber.Invalid, SequenceNumber.Invalid, RecordAppendOptions.ForceFlush);
	    
            Console.WriteLine("Done...");
        }


        // Read the records added to the log. 
        public void ReadRecords()
        {
            Encoding enc = Encoding.Unicode;

            Console.WriteLine();

            Console.WriteLine("Reading Log Records...");
            try
            {
                foreach (LogRecord record in this.sequence.ReadLogRecords(this.sequence.BaseSequenceNumber, LogRecordEnumeratorType.Next))
                {
                    byte[] data = new byte[record.Data.Length];
                    record.Data.Read(data, 0, (int)record.Data.Length);
                    string mystr = enc.GetString(data);
                    Console.WriteLine("    {0}", mystr);
                }
            }
            catch (Exception e)
            {
                Console.WriteLine("Exception {0} {1}", e.GetType(), e.Message);
            }

            Console.WriteLine();
        }

        public void FillLog()
        {
            bool append = true;

            while (append)
            {
                try
                {
                    sequence.Append(CreateData(16 * 1024), SequenceNumber.Invalid, SequenceNumber.Invalid, RecordAppendOptions.ForceFlush);
                }

                catch (SequenceFullException)
                {
                    Console.WriteLine("Log is Full...");
                    append = false;
                }
            }
        }

        // Dispose the record sequence and delete the log file. 
        public void Cleanup()
        {
            // Dispose the sequence
            sequence.Dispose();

            // Delete the log file.
            if (delete)
            {
                try
                {
                    // This deletes the base log file and all the extents associated with the log.
                    LogStore.Delete(this.logName);
                }
                catch (Exception e)
                {
                    Console.WriteLine("Exception {0} {1}", e.GetType(), e.Message);
                }
            }
        }

        // Converts the given data to an Array of ArraySegment<byte> 
        public static IList<ArraySegment<byte>> CreateData(string str)
        {
            Encoding enc = Encoding.Unicode;

            byte[] array = enc.GetBytes(str);

            ArraySegment<byte>[] segments = new ArraySegment<byte>[1];
            segments[0] = new ArraySegment<byte>(array);

            return Array.AsReadOnly<ArraySegment<byte>>(segments);
        }

        public static IList<ArraySegment<byte>> CreateData(int size)
        {
            byte[] array = new byte[size];

            Random rnd = new Random();
            rnd.NextBytes(array);

            ArraySegment<byte>[] segments = new ArraySegment<byte>[1];
            segments[0] = new ArraySegment<byte>(array);

            return Array.AsReadOnly<ArraySegment<byte>>(segments);
        }

        public static SequenceNumber GetAdvanceBaseSeqNumber(SequenceNumber recTargetSeqNum)
        {
            SequenceNumber targetSequenceNumber = SequenceNumber.Invalid;

            Console.WriteLine("Getting actual target sequence number...");
            
            // 
            // Implement the logic for returning a valid sequence number closer to
            // recommended target sequence number. 
            //

            return targetSequenceNumber;
        }

        public static void HandleTailPinned(object arg, TailPinnedEventArgs tailPinnedEventArgs)
        {
            Console.WriteLine("TailPinned has fired");

            // Based on the implementation of a logging application, the log base can be moved
            // to free up more log space and if it is not possible to move the 
            // base, the application should report by throwing an exception.

            if(MyLog.AdvanceBase)
            {
                try
                {
                    // TailPnnedEventArgs has the recommended sequence number and its generated 
                    // based on PinnedTailThreshold policy. 
                    // This does not map to an actual sequence number in the record sequence
                    // but an approximation and potentially frees up the threshold % log space
                    // when the log base is advanced to a valid sequence number closer to the 
                    // recommended sequence number. 
                    // The user should use this sequence number to locate a closest valid sequence
                    // number to advance the base of the log.

                    SequenceNumber recommendedTargetSeqNum = tailPinnedEventArgs.TargetSequenceNumber; 
                    
                    // Get the actual Target sequence number.
                    SequenceNumber actualTargetSeqNum = MyLog.GetAdvanceBaseSeqNumber(recommendedTargetSeqNum);

                    MySequence.AdvanceBaseSequenceNumber(actualTargetSeqNum);
                }
                catch (Exception e)
                {
                    Console.WriteLine("Exception thrown {0} {1}", e.GetType(), e.Message);
                }
            }
            else
            {
                // Report back Error if under some conditions the log cannot
                // advance the base sequence number.

                Console.WriteLine("Reporting Error! Unable to move the base sequence number!");
                throw new IOException();
            }
        }
    }

    class LogSample
    {
        static void Main(string[] args)
        {
            // Create log record sequence.
            MyLog log = new MyLog();

            // Add additional extents.
            log.AddExtents();

            // Enumerate the current log extents.
            log.EnumerateExtents();

            // Set log policies and register for TailPinned event notifications. 
            log.SetLogPolicy();

            log.ShowLogPolicy();
            
            // Append a few records and read the appended records. 
            log.AppendRecords();
            log.ReadRecords();

            // Fill the Log to trigger log growth...and subsequent TailPinned notifications.
            log.FillLog();

            log.EnumerateExtents();

            log.Cleanup();
        }
    }
}


Imports System.IO
Imports System.Collections.Generic
Imports System.Text
Imports System.IO.Log

Namespace MyLogRecordSequence
	Public Class MyLog
		Private logName As String = "test.log"
		Private logContainer As String = "MyExtent0"
		Private containerSize As Integer = 32 * 1024
		Private sequence As LogRecordSequence = Nothing
		Private delete As Boolean = True

		' These are used in the TailPinned event handler.
		Public Shared MySequence As LogRecordSequence = Nothing
		Public Shared AdvanceBase As Boolean = True

		Public Sub New()
			' Create a LogRecordSequence.
			sequence = New LogRecordSequence(Me.logName, FileMode.CreateNew, FileAccess.ReadWrite, FileShare.None)

			' At least one container/extent must be added for Log Record Sequence.
			sequence.LogStore.Extents.Add(Me.logContainer, Me.containerSize)

			MySequence = sequence

		End Sub

		Public Sub AddExtents()
			' Add two additional extents. The extents are 
			' of the same size as the first extent.
			sequence.LogStore.Extents.Add("MyExtent1")
			sequence.LogStore.Extents.Add("MyExtent2")
		End Sub

		Public Sub EnumerateExtents()
			Dim store As LogStore = sequence.LogStore

			Console.WriteLine("Enumerating Log Extents...")
			Console.WriteLine("    Extent Count: {0} extents", store.Extents.Count)
			Console.WriteLine("    Extents Are...")
            For Each extent In store.Extents
                Console.WriteLine("      {0} ({1}, {2})", Path.GetFileName(extent.Path), extent.Size, extent.State)
            Next extent
			Console.WriteLine("    Free Extents: {0} Free", store.Extents.FreeCount)
		End Sub

		Public Sub SetLogPolicy()
			Console.WriteLine()
			Console.WriteLine("Setting current log policy...")

			' SET LOG POLICY

			Dim policy As LogPolicy = sequence.LogStore.Policy

			' Set AutoGrow policy. This enables the log to automatically grow
			' when the existing extents are full. New extents are added until
			' we reach the MaximumExtentCount extents.
			' AutoGrow policy is supported only in Windows Vista and not available in R2.

			'policy.AutoGrow = true;

			' Set the Growth Rate in terms of extents. This policy specifies
			' "how much" the log should grow. 
			policy.GrowthRate = New PolicyUnit(2, PolicyUnitType.Extents)

			' Set the AutoShrink policy. This enables the log to automatically
			' shrink if the available free space exceeds the shrink percentage. 
			' AutoGrow/shrink policy is supported only in Windows Vista and not available in R2.

			'policy.AutoShrinkPercentage = new PolicyUnit(30, PolicyUnitType.Percentage);

			' Set the PinnedTailThreshold policy.
			' A tail pinned event is triggered when there is no
			' log space available and log space may be freed by advancing the base.
			' The user must handle the tail pinned event by advancing the base of the log. 
			' If the user is not able to move the base of the log, the user should report with exception in
			' the tail pinned handler.
			' PinnedTailThreashold policy dictates the amount of space that the TailPinned event requests 
			' for advancing the base of the log. The amount of space can be in percentage or in terms of bytes 
			' which is rounded off to the nearest containers in CLFS. The default is 35 percent.


			policy.PinnedTailThreshold = New PolicyUnit(10, PolicyUnitType.Percentage)

			' Set the maximum extents the log can have.
			policy.MaximumExtentCount = 6

			' Set the minimum extents the log can have.
			policy.MinimumExtentCount = 2

			' Set the prefix for new containers that are added. 
			' when AutoGrow is enabled.
			'policy.NewExtentPrefix = "MyLogPrefix";

			' Set the suffix number for new containers that are added.
			' when AutoGrow is enabled. 
			policy.NextExtentSuffix = 3

			' Commit the log policy.
			policy.Commit()

			' Refresh updates the IO.Log policy properties with current log policy 
			' set in the log. 
			policy.Refresh()

			' LOG POLICY END
			' 

			'+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
			' Setting up IO.Log provided capabilities...
			' 

			' SET RETRY APPEND

			' IO.Log provides a mechanism similar to AutoGrow.
			' If the existing log is full and an append fails, setting RetryAppend
			' invokes the CLFS policy engine to add new extents and re-tries
			' record appends. If MaximumExtent count has been reached, 
			' a SequenceFullException is thrown. 
			' 

			sequence.RetryAppend = True

			' RETRY APPEND END

			' REGISTER FOR TAILPINNED EVENT NOTIFICATIONS

			' Register for TailPinned Event by passing in an event handler.
			' An event is raised when the log full condition is reached.
			' The user should either advance the base sequence number to the 
			' nearest valid sequence number recommended in the tail pinned event or
			' report a failure that it is not able to advance the base sequence 
			' number. 
			'

			AddHandler sequence.TailPinned, AddressOf HandleTailPinned

			Console.WriteLine("Done...")
		End Sub

		Public Sub ShowLogPolicy()
			Console.WriteLine()
			Console.WriteLine("Showing current log policy...")

			Dim policy As LogPolicy = sequence.LogStore.Policy

			Console.WriteLine("    Minimum extent count:  {0}", policy.MinimumExtentCount)
			Console.WriteLine("    Maximum extent count:  {0}", policy.MaximumExtentCount)
			Console.WriteLine("    Growth rate:           {0}", policy.GrowthRate)
			Console.WriteLine("    Pinned tail threshold: {0}", policy.PinnedTailThreshold)
			Console.WriteLine("    Auto shrink percent:   {0}", policy.AutoShrinkPercentage)
			Console.WriteLine("    Auto grow enabled:     {0}", policy.AutoGrow)
			Console.WriteLine("    New extent prefix:     {0}", policy.NewExtentPrefix)
			Console.WriteLine("    Next extent suffix:    {0}", policy.NextExtentSuffix)

		End Sub

		' Append records. Appending three records.  
		Public Sub AppendRecords()
			Console.WriteLine("Appending Log Records...")
			Dim previous As SequenceNumber = SequenceNumber.Invalid

			previous = sequence.Append(CreateData("Hello World!"), SequenceNumber.Invalid, SequenceNumber.Invalid, RecordAppendOptions.ForceFlush)
			previous = sequence.Append(CreateData("This is my first Logging App"), SequenceNumber.Invalid, SequenceNumber.Invalid, RecordAppendOptions.ForceFlush)
			previous = sequence.Append(CreateData("Using LogRecordSequence..."), SequenceNumber.Invalid, SequenceNumber.Invalid, RecordAppendOptions.ForceFlush)

			Console.WriteLine("Done...")
		End Sub


		' Read the records added to the log. 
		Public Sub ReadRecords()
			Dim enc As Encoding = Encoding.Unicode

			Console.WriteLine()

			Console.WriteLine("Reading Log Records...")
			Try
				For Each record As LogRecord In Me.sequence.ReadLogRecords(Me.sequence.BaseSequenceNumber, LogRecordEnumeratorType.Next)
					Dim data(record.Data.Length - 1) As Byte
					record.Data.Read(data, 0, CInt(Fix(record.Data.Length)))
					Dim mystr As String = enc.GetString(data)
					Console.WriteLine("    {0}", mystr)
				Next record
			Catch e As Exception
				Console.WriteLine("Exception {0} {1}", e.GetType(), e.Message)
			End Try

			Console.WriteLine()
		End Sub

		Public Sub FillLog()
			Dim append As Boolean = True

			Do While append
				Try
					sequence.Append(CreateData(16 * 1024), SequenceNumber.Invalid, SequenceNumber.Invalid, RecordAppendOptions.ForceFlush)

				Catch e1 As SequenceFullException
					Console.WriteLine("Log is Full...")
					append = False
				End Try
			Loop
		End Sub

		' Dispose the record sequence and delete the log file. 
		Public Sub Cleanup()
			' Dispose the sequence
			sequence.Dispose()

			' Delete the log file.
			If delete Then
				Try
					' This deletes the base log file and all the extents associated with the log.
					LogStore.Delete(Me.logName)
				Catch e As Exception
					Console.WriteLine("Exception {0} {1}", e.GetType(), e.Message)
				End Try
			End If
		End Sub

		' Converts the given data to an Array of ArraySegment<byte> 
		Public Shared Function CreateData(ByVal str As String) As IList(Of ArraySegment(Of Byte))
			Dim enc As Encoding = Encoding.Unicode

			Dim array() As Byte = enc.GetBytes(str)

			Dim segments(0) As ArraySegment(Of Byte)
			segments(0) = New ArraySegment(Of Byte)(array)

            Return System.Array.AsReadOnly(Of ArraySegment(Of Byte))(segments)
		End Function

		Public Shared Function CreateData(ByVal size As Integer) As IList(Of ArraySegment(Of Byte))
			Dim array(size - 1) As Byte

			Dim rand As New Random()
			rand.NextBytes(array)

			Dim segments(0) As ArraySegment(Of Byte)
			segments(0) = New ArraySegment(Of Byte)(array)

            Return System.Array.AsReadOnly(Of ArraySegment(Of Byte))(segments)
		End Function

		Public Shared Function GetAdvanceBaseSeqNumber(ByVal recTargetSeqNum As SequenceNumber) As SequenceNumber
			Dim targetSequenceNumber As SequenceNumber = SequenceNumber.Invalid

			Console.WriteLine("Getting actual target sequence number...")

			' 
			' Implement the logic for returning a valid sequence number closer to
			' recommended target sequence number. 
			'

			Return targetSequenceNumber
		End Function

		Public Shared Sub HandleTailPinned(ByVal arg As Object, ByVal tailPinnedEventArgs As TailPinnedEventArgs)
			Console.WriteLine("TailPinned has fired")

			' Based on the implementation of a logging application, the log base can be moved
			' to free up more log space and if it is not possible to move the 
			' base, the application should report by throwing an exception.

			If MyLog.AdvanceBase Then
				Try
					' TailPnnedEventArgs has the recommended sequence number and its generated 
					' based on PinnedTailThreshold policy. 
					' This does not map to an actual sequence number in the record sequence
					' but an approximation and potentially frees up the threshold % log space
					' when the log base is advanced to a valid sequence number closer to the 
					' recommended sequence number. 
					' The user should use this sequence number to locate a closest valid sequence
					' number to advance the base of the log.

					Dim recommendedTargetSeqNum As SequenceNumber = tailPinnedEventArgs.TargetSequenceNumber

					' Get the actual Target sequence number.
					Dim actualTargetSeqNum As SequenceNumber = MyLog.GetAdvanceBaseSeqNumber(recommendedTargetSeqNum)

					MySequence.AdvanceBaseSequenceNumber(actualTargetSeqNum)
				Catch e As Exception
					Console.WriteLine("Exception thrown {0} {1}", e.GetType(), e.Message)
				End Try
			Else
				' Report back Error if under some conditions the log cannot
				' advance the base sequence number.

				Console.WriteLine("Reporting Error! Unable to move the base sequence number!")
				Throw New IOException()
			End If
		End Sub
	End Class

	Friend Class LogSample
		Shared Sub Main(ByVal args() As String)
			' Create log record sequence.
			Dim log As New MyLog()

			' Add additional extents.
			log.AddExtents()

			' Enumerate the current log extents.
			log.EnumerateExtents()

			' Set log policies and register for TailPinned event notifications. 
			log.SetLogPolicy()

			log.ShowLogPolicy()

			' Append a few records and read the appended records. 
			log.AppendRecords()
			log.ReadRecords()

			' Fill the Log to trigger log growth...and subsequent TailPinned notifications.
			log.FillLog()

			log.EnumerateExtents()

			log.Cleanup()
		End Sub
	End Class
End Namespace

Comentarios

La clase LogRecordSequence proporciona una implementación de la interfaz de secuencia de registro encima de un registro de Sistema de Registro Archivo Común (CLFS).The LogRecordSequence class provides an implementation of the record sequence interface on top of a Common Log File System (CLFS) log. Además de las características orientadas a registro estándares, proporciona un modelo de directiva para evitar las condiciones registro completo y multiplexar los clientes en el mismo archivo físico.In addition to the standard record-oriented features, it provides a policy model for avoiding log-full conditions, and multiplexing of clients on the same physical file. Funciona con la clase LogStore, que proporciona una interfaz para manipular directamente y administrar un archivo de registro de CLFS.It works with the LogStore class, which provides an interface for directly manipulating and managing a CLFS log file. La relación entre la clase LogStore y la clase LogRecordSequence es similar a la relación entre un archivo de disco y un objeto FileStream.The relationship between the LogStore class and the LogRecordSequence class is similar to the relationship between a disk file and a FileStream object. El archivo de disco proporciona el almacenamiento concreto y tiene atributos como longitud y último tiempo de acceso, mientras que el objeto FileStream proporciona una vista en el archivo que se puede utilizar para leer de él y para escribir en él.The disk file provides the concrete storage, and has attributes such as length and last access time; while the FileStream object provides a view on the file that can be used to read from it and write to it. De igual forma, la clase LogStore tiene atributos como una directiva y una colección de extensiones de disco; y la clase LogRecordSequence proporciona un mecanismo orientado al registro para la lectura y escritura de datos.Similarly, the LogStore class has attributes like a policy and a collection of disk extents; and the LogRecordSequence class provides a record-oriented mechanism for reading and writing data.

Constructores

LogRecordSequence(LogStore) LogRecordSequence(LogStore) LogRecordSequence(LogStore) LogRecordSequence(LogStore)

Inicializa una nueva instancia de la clase LogRecordSequence con el almacén de registros especificado.Initializes a new instance of the LogRecordSequence class with the specified log store.

LogRecordSequence(LogStore, Int32, Int32) LogRecordSequence(LogStore, Int32, Int32) LogRecordSequence(LogStore, Int32, Int32) LogRecordSequence(LogStore, Int32, Int32)

Inicializa una nueva instancia de la clase LogRecordSequence con el almacén de registros, el tamaño de búfer para cada registro y el número de búfer especificados.Initializes a new instance of the LogRecordSequence class with the specified log store, buffer size for each record, and buffer number.

LogRecordSequence(String, FileMode) LogRecordSequence(String, FileMode) LogRecordSequence(String, FileMode) LogRecordSequence(String, FileMode)

Inicializa una nueva instancia de la clase LogRecordSequence con una ruta de acceso especificada al almacén de registros y el modo de acceso.Initializes a new instance of the LogRecordSequence class with a specified path to the log store and the access mode.

LogRecordSequence(String, FileMode, FileAccess) LogRecordSequence(String, FileMode, FileAccess) LogRecordSequence(String, FileMode, FileAccess) LogRecordSequence(String, FileMode, FileAccess)

Inicializa una nueva instancia de la clase LogRecordSequence con una ruta de acceso especificada al almacén de registros los modos de acceso y de recurso compartido.Initializes a new instance of the LogRecordSequence class with a specified path to the log store and the access and share modes.

LogRecordSequence(String, FileMode, FileAccess, FileShare) LogRecordSequence(String, FileMode, FileAccess, FileShare) LogRecordSequence(String, FileMode, FileAccess, FileShare) LogRecordSequence(String, FileMode, FileAccess, FileShare)

Inicializa una nueva instancia de la clase LogRecordSequence con una ruta de acceso especificada al almacén de registros y el modo de acceso.Initializes a new instance of the LogRecordSequence class with a specified path to the log store and the access mode.

LogRecordSequence(String, FileMode, FileAccess, FileShare, Int32, Int32) LogRecordSequence(String, FileMode, FileAccess, FileShare, Int32, Int32) LogRecordSequence(String, FileMode, FileAccess, FileShare, Int32, Int32) LogRecordSequence(String, FileMode, FileAccess, FileShare, Int32, Int32)

Inicializa una nueva instancia de la clase LogRecordSequence con una ruta de acceso especificada al almacén del registro, permiso de archivo, modos de acceso y de recursos compartidos, así como el tamaño y número de búferes de los registros.Initializes a new instance of the LogRecordSequence class with a specified path to the log store, file permission, access and share modes, and the buffer size and count for records.

LogRecordSequence(String, FileMode, FileAccess, FileShare, Int32, Int32, FileSecurity) LogRecordSequence(String, FileMode, FileAccess, FileShare, Int32, Int32, FileSecurity) LogRecordSequence(String, FileMode, FileAccess, FileShare, Int32, Int32, FileSecurity) LogRecordSequence(String, FileMode, FileAccess, FileShare, Int32, Int32, FileSecurity)

Inicializa una nueva instancia de la clase LogRecordSequence.Initializes a new instance of the LogRecordSequence class.

Propiedades

BaseSequenceNumber BaseSequenceNumber BaseSequenceNumber BaseSequenceNumber

Obtiene el número de secuencia del primer registro válido en la LogRecordSequence actual.Gets the sequence number of the first valid record in the current LogRecordSequence.

LastSequenceNumber LastSequenceNumber LastSequenceNumber LastSequenceNumber

Obtiene el número de secuencia que es mayor que el último registro anexado.Gets the sequence number which is greater than the last record appended

LogStore LogStore LogStore LogStore

Obtiene el LogStore que contiene los datos de esta secuencia de registro.Gets the LogStore that contains the data for this record sequence. Este método no puede heredarse.This method cannot be inherited.

MaximumRecordLength MaximumRecordLength MaximumRecordLength MaximumRecordLength

Obtiene el tamaño máximo de un registro que se puede agregar a esta secuencia de registro.Gets the maximum size of a record that can be added to this record sequence.

ReservedBytes ReservedBytes ReservedBytes ReservedBytes

Obtiene el número total de bytes que se ha reservado.Gets the total number of bytes that have been reserved.

RestartSequenceNumber RestartSequenceNumber RestartSequenceNumber RestartSequenceNumber

Obtiene el número de secuencia del área de reinicio más cercano al final del registro.Gets the sequence number of the restart area closest to the end of the log.

RetryAppend RetryAppend RetryAppend RetryAppend

Obtiene o establece un valor que indica si los anexos se reintentan automáticamente en caso de que el registro esté completo.Gets or sets a value indicating whether or not appends are automatically retried if the log is full.

Métodos

AdvanceBaseSequenceNumber(SequenceNumber) AdvanceBaseSequenceNumber(SequenceNumber) AdvanceBaseSequenceNumber(SequenceNumber) AdvanceBaseSequenceNumber(SequenceNumber)

Avanza el número de secuencia base del registro.Moves the base sequence number of the log forward. Este método no puede heredarse.This method cannot be inherited.

Append(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions) Append(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions) Append(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions) Append(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions)

Escribe una entrada de registro en la LogRecordSequence.Writes a log record to the LogRecordSequence. Este método no puede heredarse.This method cannot be inherited.

Append(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection) Append(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection) Append(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection) Append(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection)

Anexa una entrada de registro a la IRecordSequence, utilizando el espacio previamente reservado en la secuencia.Appends a log record to the IRecordSequence, using space previously reserved in the sequence. Este método no puede heredarse.This method cannot be inherited.

Append(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions) Append(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions) Append(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions) Append(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions)

Anexa una entrada de registro a la IRecordSequence.Appends a log record to the IRecordSequence. Este método no puede heredarse.This method cannot be inherited.

Append(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection) Append(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection) Append(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection) Append(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection)

Anexa una entrada de registro a la IRecordSequence, utilizando el espacio previamente reservado en la secuencia.Appends a log record to the IRecordSequence, using space previously reserved in the sequence. Este método no puede heredarse.This method cannot be inherited.

BeginAppend(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, AsyncCallback, Object) BeginAppend(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, AsyncCallback, Object) BeginAppend(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, AsyncCallback, Object) BeginAppend(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, AsyncCallback, Object)

Comienza una operación de anexado asincrónica.Begins an asynchronous append operation. Este método no puede heredarse.This method cannot be inherited.

BeginAppend(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, AsyncCallback, Object) BeginAppend(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, AsyncCallback, Object) BeginAppend(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, AsyncCallback, Object) BeginAppend(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, AsyncCallback, Object)

Comienza una operación de anexado asincrónica.Begins an asynchronous append operation. Este método no puede heredarse.This method cannot be inherited.

BeginAppend(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions, AsyncCallback, Object) BeginAppend(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions, AsyncCallback, Object) BeginAppend(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions, AsyncCallback, Object) BeginAppend(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions, AsyncCallback, Object)

Comienza una operación de anexado asincrónica.Begins an asynchronous append operation. Este método no puede heredarse.This method cannot be inherited.

BeginAppend(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, AsyncCallback, Object) BeginAppend(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, AsyncCallback, Object) BeginAppend(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, AsyncCallback, Object) BeginAppend(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, AsyncCallback, Object)

Comienza una operación de anexado asincrónica.Begins an asynchronous append operation. Este método no puede heredarse.This method cannot be inherited.

BeginFlush(SequenceNumber, AsyncCallback, Object) BeginFlush(SequenceNumber, AsyncCallback, Object) BeginFlush(SequenceNumber, AsyncCallback, Object) BeginFlush(SequenceNumber, AsyncCallback, Object)

Comienza una operación de vaciado asincrónica, utilizando el espacio previamente reservado en la secuencia.Begins an asynchronous flush operation, using space previously reserved in the sequence. Este método no puede heredarse.This method cannot be inherited.

BeginReserveAndAppend(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, Int64[], AsyncCallback, Object) BeginReserveAndAppend(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, Int64[], AsyncCallback, Object) BeginReserveAndAppend(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, Int64[], AsyncCallback, Object) BeginReserveAndAppend(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, Int64[], AsyncCallback, Object)

Comienza una reserva asincrónica y una operación de anexado.Begins an asynchronous reserve and append operation. Este método no puede heredarse.This method cannot be inherited.

BeginReserveAndAppend(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, Int64[], AsyncCallback, Object) BeginReserveAndAppend(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, Int64[], AsyncCallback, Object) BeginReserveAndAppend(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, Int64[], AsyncCallback, Object) BeginReserveAndAppend(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, Int64[], AsyncCallback, Object)

Comienza una reserva asincrónica y una operación de anexado.Begins an asynchronous reserve and append operation. Este método no puede heredarse.This method cannot be inherited.

BeginWriteRestartArea(ArraySegment<Byte>, SequenceNumber, ReservationCollection, AsyncCallback, Object) BeginWriteRestartArea(ArraySegment<Byte>, SequenceNumber, ReservationCollection, AsyncCallback, Object) BeginWriteRestartArea(ArraySegment<Byte>, SequenceNumber, ReservationCollection, AsyncCallback, Object) BeginWriteRestartArea(ArraySegment<Byte>, SequenceNumber, ReservationCollection, AsyncCallback, Object)

Comienza una operación de escritura de área de reinicio asincrónica, utilizando el espacio reservado previamente en la secuencia.Begins an asynchronous restart area write operation, using space previously reserved in the sequence. Este método no puede heredarse.This method cannot be inherited.

BeginWriteRestartArea(IList<ArraySegment<Byte>>, SequenceNumber, ReservationCollection, AsyncCallback, Object) BeginWriteRestartArea(IList<ArraySegment<Byte>>, SequenceNumber, ReservationCollection, AsyncCallback, Object) BeginWriteRestartArea(IList<ArraySegment<Byte>>, SequenceNumber, ReservationCollection, AsyncCallback, Object) BeginWriteRestartArea(IList<ArraySegment<Byte>>, SequenceNumber, ReservationCollection, AsyncCallback, Object)

Comienza una operación de escritura de área de reinicio asincrónica, utilizando el espacio reservado previamente en la secuencia.Begins an asynchronous restart area write operation, using space previously reserved in the sequence. Este método no puede heredarse.This method cannot be inherited.

CreateReservationCollection() CreateReservationCollection() CreateReservationCollection() CreateReservationCollection()

Crea un nuevo ReservationCollection.Creates a new ReservationCollection. Este método no puede heredarse.This method cannot be inherited.

Dispose() Dispose() Dispose() Dispose()

Libera los recursos utilizados por el componente.Releases the resources used by the component.

EndAppend(IAsyncResult) EndAppend(IAsyncResult) EndAppend(IAsyncResult) EndAppend(IAsyncResult)

Finaliza una operación de anexado asincrónica.Ends an asynchronous append operation. Este método no puede heredarse.This method cannot be inherited.

EndFlush(IAsyncResult) EndFlush(IAsyncResult) EndFlush(IAsyncResult) EndFlush(IAsyncResult)

Finaliza una operación de vaciado asincrónica.Ends an asynchronous flush operation. Este método no puede heredarse.This method cannot be inherited.

EndReserveAndAppend(IAsyncResult) EndReserveAndAppend(IAsyncResult) EndReserveAndAppend(IAsyncResult) EndReserveAndAppend(IAsyncResult)

Finaliza una reserva asincrónica y una operación de anexado.Ends an asynchronous reserve and append operation. Este método no puede heredarse.This method cannot be inherited.

EndWriteRestartArea(IAsyncResult) EndWriteRestartArea(IAsyncResult) EndWriteRestartArea(IAsyncResult) EndWriteRestartArea(IAsyncResult)

Finaliza una operación de escritura de área de reinicio asincrónica.Ends an asynchronous restart area write operation. Este método no puede heredarse.This method cannot be inherited.

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Determina si el objeto especificado es igual al objeto actual.Determines whether the specified object is equal to the current object.

(Inherited from Object)
Flush() Flush() Flush() Flush()

Asegúrese de que todos los registros anexados se han escrito.Ensures that all appended records have been written. Este método no puede heredarse.This method cannot be inherited.

Flush(SequenceNumber) Flush(SequenceNumber) Flush(SequenceNumber) Flush(SequenceNumber)

Asegura que todos los registros anexados incluyendo el registro con el número de secuencia especificado se han escrito de manera duradera.Ensures that all appended records up to and including the record with the specified sequence number have been durably written. Este método no puede heredarse.This method cannot be inherited.

GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Sirve como la función hash predeterminada.Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

Obtiene el Type de la instancia actual.Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Crea una copia superficial del objeto Object actual.Creates a shallow copy of the current Object.

(Inherited from Object)
ReadLogRecords(SequenceNumber, LogRecordEnumeratorType) ReadLogRecords(SequenceNumber, LogRecordEnumeratorType) ReadLogRecords(SequenceNumber, LogRecordEnumeratorType) ReadLogRecords(SequenceNumber, LogRecordEnumeratorType)

Devuelve una colección enumerable de registros en la secuencia.Returns an enumerable collection of records in the sequence. Este método no puede heredarse.This method cannot be inherited.

ReadRestartAreas() ReadRestartAreas() ReadRestartAreas() ReadRestartAreas()

Devuelve una colección enumerable de las áreas de reinicio de la secuencia.Returns an enumerable collection of the restart areas in the sequence. Este método no puede heredarse.This method cannot be inherited.

ReserveAndAppend(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, Int64[]) ReserveAndAppend(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, Int64[]) ReserveAndAppend(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, Int64[]) ReserveAndAppend(ArraySegment<Byte>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, Int64[])

Realiza automáticamente una reserva única y anexa un registro a la secuencia.Automatically makes a single reservation and appends a record to the sequence. Este método no puede heredarse.This method cannot be inherited.

ReserveAndAppend(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, Int64[]) ReserveAndAppend(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, Int64[]) ReserveAndAppend(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, Int64[]) ReserveAndAppend(IList<ArraySegment<Byte>>, SequenceNumber, SequenceNumber, RecordAppendOptions, ReservationCollection, Int64[])

Realiza automáticamente una reserva única y anexa un registro a la secuencia.Automatically makes a single reservation and appends a record to the sequence. Este método no puede heredarse.This method cannot be inherited.

SetLastRecord(SequenceNumber) SetLastRecord(SequenceNumber) SetLastRecord(SequenceNumber) SetLastRecord(SequenceNumber)

Establece el último registro en LogRecordSequence.Sets the last record in the LogRecordSequence.

ToString() ToString() ToString() ToString()

Devuelve una cadena que representa el objeto actual.Returns a string that represents the current object.

(Inherited from Object)
WriteRestartArea(ArraySegment<Byte>) WriteRestartArea(ArraySegment<Byte>) WriteRestartArea(ArraySegment<Byte>) WriteRestartArea(ArraySegment<Byte>)

Escribe un área de reinicio en LogRecordSequence.Writes a restart area to the LogRecordSequence. Este método no puede heredarse.This method cannot be inherited.

WriteRestartArea(ArraySegment<Byte>, SequenceNumber) WriteRestartArea(ArraySegment<Byte>, SequenceNumber) WriteRestartArea(ArraySegment<Byte>, SequenceNumber) WriteRestartArea(ArraySegment<Byte>, SequenceNumber)

Escribe un área de reinicio en la LogRecordSequence y actualiza el número de secuencia base.Writes a restart area to the LogRecordSequence and updates the base sequence number. Este método no puede heredarse.This method cannot be inherited.

WriteRestartArea(ArraySegment<Byte>, SequenceNumber, ReservationCollection) WriteRestartArea(ArraySegment<Byte>, SequenceNumber, ReservationCollection) WriteRestartArea(ArraySegment<Byte>, SequenceNumber, ReservationCollection) WriteRestartArea(ArraySegment<Byte>, SequenceNumber, ReservationCollection)

Escribe un área de reinicio a la LogRecordSequence usando una reserva y actualiza el número de secuencia base.Writes a restart area to the LogRecordSequence using a reservation, and updates the base sequence number. Este método no puede heredarse.This method cannot be inherited.

WriteRestartArea(IList<ArraySegment<Byte>>) WriteRestartArea(IList<ArraySegment<Byte>>) WriteRestartArea(IList<ArraySegment<Byte>>) WriteRestartArea(IList<ArraySegment<Byte>>)

Escribe un área de reinicio en LogRecordSequence.Writes a restart area to the LogRecordSequence. Este método no puede heredarse.This method cannot be inherited.

WriteRestartArea(IList<ArraySegment<Byte>>, SequenceNumber) WriteRestartArea(IList<ArraySegment<Byte>>, SequenceNumber) WriteRestartArea(IList<ArraySegment<Byte>>, SequenceNumber) WriteRestartArea(IList<ArraySegment<Byte>>, SequenceNumber)

Escribe un área de reinicio en la LogRecordSequence y actualiza el número de secuencia base.Writes a restart area to the LogRecordSequence and updates the base sequence number. Este método no puede heredarse.This method cannot be inherited.

WriteRestartArea(IList<ArraySegment<Byte>>, SequenceNumber, ReservationCollection) WriteRestartArea(IList<ArraySegment<Byte>>, SequenceNumber, ReservationCollection) WriteRestartArea(IList<ArraySegment<Byte>>, SequenceNumber, ReservationCollection) WriteRestartArea(IList<ArraySegment<Byte>>, SequenceNumber, ReservationCollection)

Escribe un área de reinicio a la LogRecordSequence usando una reserva y actualiza el número de secuencia base.Writes a restart area to the LogRecordSequence using a reservation, and updates the base sequence number. Este método no puede heredarse.This method cannot be inherited.

Eventos

TailPinned TailPinned TailPinned TailPinned

Señala la necesidad de mover la cola de la secuencia.Signals the need to move the tail of the sequence.

Se aplica a