LogRecordSequence LogRecordSequence LogRecordSequence LogRecordSequence Class

定義

LogStore に格納されているレコード シーケンスを表します。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
継承
LogRecordSequenceLogRecordSequenceLogRecordSequenceLogRecordSequence
実装

LogRecordSequence クラスを使用する方法を次の例に示します。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
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

注釈

LogRecordSequence クラスは、Common Log File System (CLFS) ログ上でレコード シーケンス インターフェイスの実装を提供します。The LogRecordSequence class provides an implementation of the record sequence interface on top of a Common Log File System (CLFS) log. 標準のレコード指向の機能に加えて、ログがいっぱいになる条件を回避し、同じ物理ファイル上でクライアントを多重化するためのポリシー モデルを提供します。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. CLFS ログ ファイルを直接操作および管理するためのインターフェイスを提供する LogStore クラスと共に動作します。It works with the LogStore class, which provides an interface for directly manipulating and managing a CLFS log file. LogStore クラスと LogRecordSequence クラスの関係は、ディスク ファイルと FileStream オブジェクトの関係に似ています。The relationship between the LogStore class and the LogRecordSequence class is similar to the relationship between a disk file and a FileStream object. ディスク ファイルは具象的な記憶域を提供し長さや最終アクセス日時などの属性を持つのに対して、FileStream オブジェクトはファイルに対する読み書きで使用できるファイルに関するビューを提供します。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. 同様に、LogStore クラスはポリシーやディスク エクステントのコレクションなどの属性を持つのに対して、LogRecordSequence クラスはデータを読み書きするためのレコード指向の機構を提供します。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.

コンストラクター

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

ログ ストアを指定して、LogRecordSequence クラスの新しいインスタンスを初期化します。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)

指定したログ ストア、各レコードのバッファー サイズ、バッファー番号を使用して、LogRecordSequence クラスの新しいインスタンスを初期化します。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)

ログ ストアとアクセス モードのパスを指定して、LogRecordSequence クラスの新しいインスタンスを初期化します。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)

ログ ストア、アクセス モード、および共有モードのパスを指定して、LogRecordSequence クラスの新しいインスタンスを初期化します。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)

ログ ストアとアクセス モードのパスを指定して、LogRecordSequence クラスの新しいインスタンスを初期化します。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)

ログ ストア、ファイル アクセス許可、アクセス モード、共有モード、およびレコードのバッファー サイズとバッファー カウントのパスを指定して、LogRecordSequence クラスの新しいインスタンスを初期化します。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)

LogRecordSequence クラスの新しいインスタンスを初期化します。Initializes a new instance of the LogRecordSequence class.

プロパティ

BaseSequenceNumber BaseSequenceNumber BaseSequenceNumber BaseSequenceNumber

現在の LogRecordSequence 内の最初の有効なレコードのシーケンス番号を取得します。Gets the sequence number of the first valid record in the current LogRecordSequence.

LastSequenceNumber LastSequenceNumber LastSequenceNumber LastSequenceNumber

追加された最後のレコードのシーケンス番号より大きいシーケンス番号を取得します。Gets the sequence number which is greater than the last record appended

LogStore LogStore LogStore LogStore

このレコード シーケンスのデータを含む LogStore を取得します。Gets the LogStore that contains the data for this record sequence. このメソッドは継承できません。This method cannot be inherited.

MaximumRecordLength MaximumRecordLength MaximumRecordLength MaximumRecordLength

このレコード シーケンスに追加可能なレコードの最大サイズを取得します。Gets the maximum size of a record that can be added to this record sequence.

ReservedBytes ReservedBytes ReservedBytes ReservedBytes

予約された合計バイト数を取得します。Gets the total number of bytes that have been reserved.

RestartSequenceNumber RestartSequenceNumber RestartSequenceNumber RestartSequenceNumber

ログの最後に最も近い再開領域のシーケンス番号を取得します。Gets the sequence number of the restart area closest to the end of the log.

RetryAppend RetryAppend RetryAppend RetryAppend

ログがいっぱいの場合に、追加を自動的に再試行するかどうかを示す値を取得または設定します。Gets or sets a value indicating whether or not appends are automatically retried if the log is full.

メソッド

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

ログの基本シーケンス番号を前方移動します。Moves the base sequence number of the log forward. このメソッドは継承できません。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)

ログ レコードを LogRecordSequence に書き込みます。Writes a log record to the LogRecordSequence. このメソッドは継承できません。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)

以前にシーケンスに予約された領域を使用して、IRecordSequence にログ レコードを追加します。Appends a log record to the IRecordSequence, using space previously reserved in the sequence. このメソッドは継承できません。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)

IRecordSequence にログ レコードを追加します。Appends a log record to the IRecordSequence. このメソッドは継承できません。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)

以前にシーケンスに予約された領域を使用して、IRecordSequence にログ レコードを追加します。Appends a log record to the IRecordSequence, using space previously reserved in the sequence. このメソッドは継承できません。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)

非同期の追加操作を開始します。Begins an asynchronous append operation. このメソッドは継承できません。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)

非同期の追加操作を開始します。Begins an asynchronous append operation. このメソッドは継承できません。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)

非同期の追加操作を開始します。Begins an asynchronous append operation. このメソッドは継承できません。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)

非同期の追加操作を開始します。Begins an asynchronous append operation. このメソッドは継承できません。This method cannot be inherited.

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

以前にシーケンス内で予約された領域を使用して、非同期のフラッシュ操作を開始します。Begins an asynchronous flush operation, using space previously reserved in the sequence. このメソッドは継承できません。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)

非同期の予約および追加操作を開始します。Begins an asynchronous reserve and append operation. このメソッドは継承できません。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)

非同期の予約および追加操作を開始します。Begins an asynchronous reserve and append operation. このメソッドは継承できません。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)

以前にシーケンス内で予約された領域を使用して、非同期の再開領域の書き込み操作を開始します。Begins an asynchronous restart area write operation, using space previously reserved in the sequence. このメソッドは継承できません。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)

以前にシーケンス内で予約された領域を使用して、非同期の再開領域の書き込み操作を開始します。Begins an asynchronous restart area write operation, using space previously reserved in the sequence. このメソッドは継承できません。This method cannot be inherited.

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

新しい ReservationCollection を作成します。Creates a new ReservationCollection. このメソッドは継承できません。This method cannot be inherited.

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

コンポーネントによって使用されているリソースを解放します。Releases the resources used by the component.

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

非同期の追加操作を終了します。Ends an asynchronous append operation. このメソッドは継承できません。This method cannot be inherited.

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

非同期フラッシュ操作を終了します。Ends an asynchronous flush operation. このメソッドは継承できません。This method cannot be inherited.

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

非同期の予約および追加操作を終了します。Ends an asynchronous reserve and append operation. このメソッドは継承できません。This method cannot be inherited.

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

非同期の再開領域の書き込み操作を終了します。Ends an asynchronous restart area write operation. このメソッドは継承できません。This method cannot be inherited.

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

指定したオブジェクトが、現在のオブジェクトと等しいかどうかを判断します。Determines whether the specified object is equal to the current object.

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

追加したすべてのレコードが書き込まれたことを確認します。Ensures that all appended records have been written. このメソッドは継承できません。This method cannot be inherited.

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

指定のシーケンス番号以下のシーケンス番号を持つすべての追加されたレコードが永続的に書き込まれたことが確認されます。Ensures that all appended records up to and including the record with the specified sequence number have been durably written. このメソッドは継承できません。This method cannot be inherited.

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

既定のハッシュ関数として機能します。Serves as the default hash function.

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

現在のインスタンスの Type を取得します。Gets the Type of the current instance.

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

現在の Object の簡易コピーを作成します。Creates a shallow copy of the current Object.

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

シーケンス内のレコードの列挙可能なコレクションを返します。Returns an enumerable collection of records in the sequence. このメソッドは継承できません。This method cannot be inherited.

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

シーケンス内の再開領域の列挙可能なコレクションを返します。Returns an enumerable collection of the restart areas in the sequence. このメソッドは継承できません。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[])

単一の予約を自動的に行って、シーケンスにレコードを追加します。Automatically makes a single reservation and appends a record to the sequence. このメソッドは継承できません。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[])

単一の予約を自動的に行って、シーケンスにレコードを追加します。Automatically makes a single reservation and appends a record to the sequence. このメソッドは継承できません。This method cannot be inherited.

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

LogRecordSequence の最後の項目を設定します。Sets the last record in the LogRecordSequence.

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

現在のオブジェクトを表す文字列を返します。Returns a string that represents the current object.

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

再開領域を LogRecordSequence に書き込みます。Writes a restart area to the LogRecordSequence. このメソッドは継承できません。This method cannot be inherited.

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

再開領域を LogRecordSequence に書き込み、基本シーケンス番号を更新します。Writes a restart area to the LogRecordSequence and updates the base sequence number. このメソッドは継承できません。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)

予約を使用して再開領域を LogRecordSequence に書き込み、基本シーケンス番号を更新します。Writes a restart area to the LogRecordSequence using a reservation, and updates the base sequence number. このメソッドは継承できません。This method cannot be inherited.

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

再開領域を LogRecordSequence に書き込みます。Writes a restart area to the LogRecordSequence. このメソッドは継承できません。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)

再開領域を LogRecordSequence に書き込み、基本シーケンス番号を更新します。Writes a restart area to the LogRecordSequence and updates the base sequence number. このメソッドは継承できません。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)

予約を使用して再開領域を LogRecordSequence に書き込み、基本シーケンス番号を更新します。Writes a restart area to the LogRecordSequence using a reservation, and updates the base sequence number. このメソッドは継承できません。This method cannot be inherited.

イベント

TailPinned TailPinned TailPinned TailPinned

シーケンスの末尾を移動する必要があることを示します。Signals the need to move the tail of the sequence.

適用対象