Clerk Class

Writes records of transactional actions to a log.

Namespace: System.EnterpriseServices.CompensatingResourceManager
Assembly: System.EnterpriseServices (in system.enterpriseservices.dll)

'Declaration
Public NotInheritable Class Clerk
'Usage
Dim instance As Clerk

public final class Clerk
public final class Clerk

Each clerk is associated with a compensator, which is called back to perform actions during the two-phase commit of the transaction.

The following code example demonstrates the use of this class.

' A CRM Worker
<Transaction()>  _
Public Class Account
    Inherits ServicedComponent
    
    ' A data member for the account file name.
    Private filename As String
    
    
    Public Property Filenam() As String
        Get
            Return Filename
        End Get
        Set(ByVal value As String)
            filename = Value
        End Set
    End Property
    
    
    ' A boolean data member that determines whether to commit or abort the transaction.
    Private commit As Boolean
    
    
    Public Property AllowCommit() As Boolean 
        Get
            Return commit
        End Get
        Set
            commit = value
        End Set
    End Property
    
    
    
    
    ' Debit the account, 
    Public Sub DebitAccount(ByVal ammount As Integer) 
        
        ' Create a new clerk using the AccountCompensator class.
        Dim clerk As New Clerk(GetType(AccountCompensator), "An account transaction compensator", CompensatorOptions.AllPhases)
        ' Create a record of previous account status, and deliver it to the clerk.
        Dim balance As Integer = AccountManager.ReadAccountBalance(Filenam)
        
        Dim record(1) As [Object]
        record(0) = filename
        record(1) = balance
        
        clerk.WriteLogRecord(record)
        clerk.ForceLog()
        ' Perform the transaction
        balance -= ammount
        AccountManager.WriteAccountBalance(filename, balance)
        
        ' Commit or abort the transaction 
        If commit Then
            ContextUtil.SetComplete()
        Else
            ContextUtil.SetAbort()
        End If
    
End Class 'Account


// A CRM Worker
/** @attribute Transaction()
 */
public class Account extends ServicedComponent
{
    // A data member for the account file name.
    /** @property 
     */
    private String fileName;
    
    public String get_fileName()
    {
        return fileName;
    } //get_fileName
    
    public void set_fileName(String value)
    {
        fileName = value;
    } //set_fileName

    // A boolean data member that determines whether to commit or
    // abort the transaction.
    private boolean commit;

    /** @property 
     */
    public boolean get_AllowCommit()
    {
        return commit;
    } //get_AllowCommit

    /** @property 
     */
    public void set_AllowCommit(boolean value)
    {
        commit = value;
    } //set_AllowCommit

    // Debit the account, 
    public void DebitAccount(int ammount)
    {
        // Create a new clerk using the AccountCompensator class.
        Clerk clerk = new Clerk(AccountCompensator.class.ToType(),
            "An account transaction compensator",
            CompensatorOptions.AllPhases);

        // Create a record of previous account status, and deliver
        // it to the clerk.
        Console.WriteLine("filename = " + fileName);
        int balance = AccountManager.ReadAccountBalance(fileName);

        Object record[] = new Object[2];
        record.set_Item(0, fileName);
        record.set_Item(1,(Int32)balance);

        clerk.WriteLogRecord(record);
        clerk.ForceLog();

        // Perform the transaction
        balance -= ammount;
        AccountManager.WriteAccountBalance(fileName, balance);

        // Commit or abort the transaction 
        if (commit) {
            ContextUtil.SetComplete();
        }
        else {
            ContextUtil.SetAbort();
        }
    } //DebitAccount 
} //Account

The following code example demonstrates the corresponding Compensator class.

Imports System



Public Class CrmClient
    
    
    Public Shared Sub Main() 
        
        ' Create a new account object. The object is created in a COM+ server application.
        Dim account As New Account()
        
        ' Transactionally debit the account.
        Try
            account.Filenam = System.IO.Path.GetFullPath("JohnDoe")
            account.AllowCommit = True
            account.DebitAccount(3)
        Finally
            account.Dispose()
        End Try
    
    End Sub 'Main 
End Class 'CrmClient


import System.*;

public class CrmClient
{
    public static void main(String[] args)
    {
        // Create a new account object. The object is created in a COM+
        // server application.
        Account account = new Account();

        // Transactionally debit the account.
        try {
            account.set_fileName(System.IO.Path.GetFullPath("JohnDoe"));
            account.set_AllowCommit(true);
            account.DebitAccount(3);
        }
        finally {
            account.Dispose();
        }
    } //main
} //CrmClient 

System.Object
  System.EnterpriseServices.CompensatingResourceManager.Clerk

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

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