IEnlistmentNotification Interfaccia

Definizione

public interface class IEnlistmentNotification

public interface IEnlistmentNotification

type IEnlistmentNotification = interface

Public Interface IEnlistmentNotification

Derivato

System.Transactions.ISinglePhaseNotification

Esempio

Nell'esempio seguente viene illustrata un'implementazione di questa interfaccia, nonché l'integrazione dell'oggetto come partecipante a una transazione utilizzando il metodo EnlistVolatile.The following example shows an implementation of this interface, as well as enlisting the object as a participant in a transaction using the EnlistVolatile method.

static void Main(string[] args)
{
    try
    {
        using (TransactionScope scope = new TransactionScope())
        {
        
            //Create an enlistment object
            myEnlistmentClass myElistment = new myEnlistmentClass();

            //Enlist on the current transaction with the enlistment object
            Transaction.Current.EnlistVolatile(myElistment, EnlistmentOptions.None);

            //Perform transactional work here.

            //Call complete on the TransactionScope based on console input
                            ConsoleKeyInfo c;
            while(true)
                            {
                Console.Write("Complete the transaction scope? [Y|N] ");
                c = Console.ReadKey();
                Console.WriteLine();
        
                                    if ((c.KeyChar == 'Y') || (c.KeyChar == 'y'))
                {
                    scope.Complete();
                    break;
                }
                else if ((c.KeyChar == 'N') || (c.KeyChar == 'n'))
                {
                    break;
                }
            }
        }
    }
    catch (System.Transactions.TransactionException ex)
    {
        Console.WriteLine(ex);
    }
    catch
    {
        Console.WriteLine("Cannot complete transaction");
        throw;
    }
}

class myEnlistmentClass : IEnlistmentNotification
{
    public void Prepare(PreparingEnlistment preparingEnlistment)
    {
        Console.WriteLine("Prepare notification received");

        //Perform transactional work

        //If work finished correctly, reply prepared
        preparingEnlistment.Prepared();

        // otherwise, do a ForceRollback
        preparingEnlistment.ForceRollback();
    }

    public void Commit(Enlistment enlistment)
    {
        Console.WriteLine("Commit notification received");

        //Do any work necessary when commit notification is received

        //Declare done on the enlistment
        enlistment.Done();
    }

    public void Rollback(Enlistment enlistment)
    {
        Console.WriteLine("Rollback notification received");

        //Do any work necessary when rollback notification is received

        //Declare done on the enlistment
        enlistment.Done();
    }

    public void InDoubt(Enlistment enlistment)
    {
        Console.WriteLine("In doubt notification received");

        //Do any work necessary when indout notification is received
        
        //Declare done on the enlistment
        enlistment.Done();
    }
}

    Public Shared Sub Main()
        Try
            Using scope As TransactionScope = New TransactionScope()

                'Create an enlistment object
                Dim myEnlistmentClass As New EnlistmentClass

                'Enlist on the current transaction with the enlistment object
                Transaction.Current.EnlistVolatile(myEnlistmentClass, EnlistmentOptions.None)

                'Perform transactional work here.

                'Call complete on the TransactionScope based on console input
                Dim c As ConsoleKeyInfo
                While (True)
                    Console.Write("Complete the transaction scope? [Y|N] ")
                    c = Console.ReadKey()
                    Console.WriteLine()
                    If (c.KeyChar = "Y") Or (c.KeyChar = "y") Then
                        scope.Complete()
                        Exit While
                    ElseIf ((c.KeyChar = "N") Or (c.KeyChar = "n")) Then
                        Exit While
                    End If
                End While
            End Using
        Catch ex As TransactionException
            Console.WriteLine(ex)
        Catch
            Console.WriteLine("Cannot complete transaction")
            Throw
        End Try
    End Sub
End Class

Public Class EnlistmentClass
    Implements IEnlistmentNotification

    Public Sub Prepare(ByVal myPreparingEnlistment As PreparingEnlistment) Implements System.Transactions.IEnlistmentNotification.Prepare
        Console.WriteLine("Prepare notification received")

        'Perform transactional work

        'If work finished correctly, reply with prepared
        myPreparingEnlistment.Prepared()
    End Sub

    Public Sub Commit(ByVal myEnlistment As Enlistment) Implements System.Transactions.IEnlistmentNotification.Commit
        Console.WriteLine("Commit notification received")

        'Do any work necessary when commit notification is received

        'Declare done on the enlistment
        myEnlistment.Done()
    End Sub

    Public Sub Rollback(ByVal myEnlistment As Enlistment) Implements System.Transactions.IEnlistmentNotification.Rollback
        Console.WriteLine("Rollback notification received")

        'Do any work necessary when rollback notification is received

        'Declare done on the enlistment
        myEnlistment.Done()
    End Sub

    Public Sub InDoubt(ByVal myEnlistment As Enlistment) Implements System.Transactions.IEnlistmentNotification.InDoubt
        Console.WriteLine("In doubt notification received")

        'Do any work necessary when indout notification is received

        'Declare done on the enlistment
        myEnlistment.Done()
    End Sub
End Class

Commenti

Affinché una gestione risorse partecipi a una transazione, è necessario integrarla nella transazione tramite la gestione transazioni.In order for a resource manager to participate in a transaction, it must enlist in the transaction through the transaction manager. La classe Transaction definisce un set di metodi i cui nomi iniziano con Enlist che forniscono questa funzionalità.The Transaction class defines a set of methods whose names begin with Enlist that provide this functionality. I diversi metodi Enlist corrispondono ai vari tipi di integrazione disponibili in un gestore di risorse.The different Enlist methods correspond to the different types of enlistment that a resource manager may have.

Questa classe descrive un'interfaccia che deve essere implementata da un gestore di risorse per fornire callback di notifica di commit a due fasi per la gestione transazioni in seguito all'integrazione per la partecipazione.This class describes an interface that a resource manager should implement to provide two phase commit notification callbacks for the transaction manager upon enlisting for participation. Per ogni implementazione di Resource Manager dell'interfaccia IEnlistmentNotification, è necessario integrarla usando il metodo EnlistVolatile o il metodo EnlistDurable della classe Transaction, a seconda che la risorsa sia volatile o durevole.For each resource manager's implementation of the IEnlistmentNotification interface, you should enlist it using the EnlistVolatile method or the EnlistDurable method of the Transaction class, depending on whether your resource is volatile or durable. Per ulteriori informazioni sull'integrazione e 2PC, vedere integrazione di risorse come partecipanti a una transazione e commit di una transazione rispettivamente in un'unica fase e in più fasi .For more information on enlistment and 2PC, see Enlisting Resources as Participants in a Transaction and Committing a Transaction in Single-Phase and Multi-Phase respectively.

Il gestore delle transazioni invia una notifica all'oggetto integrato in fasi diverse del protocollo di commit a due fasi mediante i metodi seguenti.The transaction manager notifies the enlisted object at different phases of the Two Phase Commit Protocol by the following methods.

Metodi

Si applica a

Vedi anche

• ISinglePhaseNotification
• Integrazione di risorse come partecipanti a una transazioneEnlisting Resources as Participants in a Transaction
• Commit di una transazione in monofase e multifaseCommitting a Transaction in Single-Phase and Multi-Phase