Procédure de création d'un gestionnaire CRM

Article
04/22/2008

Exemple de code

Un gestionnaire CRM (compensating resource manager) est un service fourni par COM+ qui vous permet d'inclure des objets non transactionnels dans des transactions Microsoft Distributed Transaction Coordinator (DTC). Bien que les CRM n'offrent pas les mêmes fonctionnalités qu'un gestionnaire de ressources complet, ils assurent néanmoins l'atomicité transactionnelle (comportement de type tout ou rien) et la durabilité via le journal de récupération.

Créer un gestionnaire CRM

Importez les espaces de noms EnterpriseServices et CompensatingResourceManager.

Imports System.EnterpriseServices
Imports System.EnterpriseServices.CompensatingResourceManager

using System.EnterpriseServices;
using System.EnterpriseServices.CompensatingResourceManager;

Activez la prise en charge CRM pour l'assembly.

<assembly: ApplicationCrmEnabled>

[assembly: ApplicationCrmEnabled]

Définissez une classe de travail CRM qui dérive de la classe ServicedComponent. Par exemple, le code suivant montre une classe CRMWorker qui dérive directement de la classe ServicedComponent.
```
<Transaction> Public Class CRMWorker
      Inherits Servicedcomponent

End Class
```
```
[Transaction]
public class CRMWorker:ServicedComponent
{
}
```

Implémentez une méthode publique qui crée un objet Clerk et valide ou annule la transaction. Cette méthode doit mettre à jour le journal du gestionnaire CRM en utilisant l'objet Clerk. Par exemple, le code suivant montre une méthode CRMMethod qui met à jour le journal du gestionnaire CRM et valide ou annule la transaction.

Public Sub CRMMethod(filename As String, bCommit As Boolean)
     ' Create the clerk object.
     Dim myclerk As Clerk=New Clerk(GetType(CRMCompensator), _
               "CRMCompensator", CompensatorOptions.AllPhases)
     myclerk.WriteLogRecord(filename)
     myclerk.ForceLog()
     If bCommit=true Then
         ContextUtil.SetComplete()
     Else
         ContextUtil.SetAbort()
     End If
End Sub

public void CRMMethod(string fileName, bool bCommit)
{
      // Create clerk object.
      Clerk clerk = new Clerk(typeof(CRMCompensator), 
                            "CRMCompensator",
                            CompensatorOptions.AllPhases);
      clerk.WriteLogRecord(fileName);
      clerk.ForceLog();
      if (bCommit)
           ContextUtil.SetComplete();
      else
           ContextUtil.SetAbort();
      }

Définissez une classe qui dérive de la classe Compensation.

JustInTimeActivation()
Public Class CRMCompensator
        Inherits Compensator
End Class

[JustInTimeActivation]
public class CRMCompensator:Compensator
{
}

Remarque :
Vous devez appliquer l'attribut `JustInTimeActivation` au compensateur car, dans le cas contraire, l'abandon est appelé deux fois.

Remplacez les membres BeginPrepare, PrepareRecord, EndPrepare, BeginCommit, CommitRecord, EndCommit, BeginAbort, AbortRecord et EndAbort de la classe Compensator.

Créez une application cliente pour tester les composants CRM Worker et Compensator.

Importez les noms requis, tels que System.EnterpriseServices et l'espace de noms qui implemente les classes CRM Worker et Compensator.

Imports System
Imports System.IO
Imports System.EnterpriseServices
Imports CrmServer
Imports System.Runtime.InteropServices

using System;
using System.IO;
using System.EnterpriseServices;
using CrmServer;
using System.Runtime.InteropServices;

Définissez une classe et implémentez la méthode Main pour créer une instance de la classe CRM Worker, puis appelez cette méthode pour créer l'objet CRM Clerk. Par exemple, le code suivant crée un objet de type CRMWorker et appelle la méthode CRMMethod pour créer l'objet CRM Clerk.

Public Class CRM
    Public Shared Sub Main()                        
       dim logfilename As String = "crm.log"
       Console.WriteLine("Creating a managed CRM worker"+ _ 
                                             "object...")
       dim crmworker As CRMWorker = new CRMWorker()
       Console.WriteLine("Demonstrating a worker commit...")
       crmworker.CRMMethod(logfilename, True)
       Console.WriteLine("Demonstrating a worker abort...")
       crmworker.CRMMethod(logfilename, False)
       Console.WriteLine("DONE!")
    End Sub
End Class

class CRM
{
    public static int Main()
    { 
       string logfilename = "crm.log";
       Console.WriteLine("Creating a managed CRM worker 
                                          object...");
       CRMWorker crmworker = new CRMWorker();
       Console.WriteLine("Demonstrating a worker commit...");
       crmworker.CRMMethod(logfilename, true);
       Console.WriteLine("Demonstrating a worker abort...");
       crmworker.CRMMethod(logfilename, false);
       Console.WriteLine("DONE!");
       return 0;   
    }
}

Générez une clé forte et compilez l'exemple de code suivant.

sn –k crm.key
vbc /t:library /r:System.EnterpriseServices.dll crm.vb
vbc /r:crm.dll /r:System.EnterpriseServices.dll crmclient.vb

sn –k crm.key
csc /t:library /r:System.EnterpriseServices.dll crm.cs
csc /r:crm.dll crmclient.cs

Exemple

Imports System
Imports System.IO
Imports System.Reflection
Imports System.EnterpriseServices
Imports System.EnterpriseServices.CompensatingResourceManager

<assembly: ApplicationActivation(ActivationOption.Server)>
<assembly: ApplicationCrmEnabled>
<assembly: AssemblyKeyFile("crm.key")>

Namespace CrmServer
' Create a Worker class.
<Transaction> Public Class CRMWorker
    Inherits Servicedcomponent
          Public Sub CRMMethod(filename As String, bCommit As Boolean)
              ' Create the clerk object.
              Dim myclerk As Clerk=New Clerk(GetType(CRMCompensator), _ 
                        "CRMCompensator", CompensatorOptions.AllPhases)
              myclerk.WriteLogRecord(filename)
              myclerk.ForceLog()
              If bCommit=true Then
                    ContextUtil.SetComplete()
              Else
                    ContextUtil.SetAbort()
              End If
        End Sub
    End Class

    ' Create a class derived from the Compensator class.
    JustInTimeActivation()
    Public Class CRMCompensator
      Inherits Compensator
            Dim bBeginPrepareCalled As Boolean = False
            Dim bPrepareRecordCalled As Boolean = False
            Dim bBeginCommitCalled As Boolean = False
            Dim bCommitRecordCalled As Boolean = False
            Dim bBeginAbortCalled As Boolean = False
            Dim bAbortRecordCalled As Boolean = False
            Dim _filename as String

            Public Overrides Sub BeginPrepare()
                  bBeginPrepareCalled = True
            End Sub

            Public Overrides Function PrepareRecord(rec As LogRecord) _
                                                           As Boolean
                  dim o as Object = rec.Record
                  _fileName = o.ToString()
                  bPrepareRecordCalled = True
                  Return False
            End Function

            Public Overrides Function EndPrepare() As Boolean
                  if not bBeginPrepareCalled then Return False   

                  if not bPrepareRecordCalled then Return False
                  if _fileName="" then Return False
                  ' This is a Prepare Phase success.
                  Return True
            End Function

            Public Overrides Sub BeginCommit(fRecovery As Boolean)
                  bBeginCommitCalled = True
            End Sub

            Public Overrides Function CommitRecord(rec As LogRecord) _
                                                          As Boolean
                  bCommitRecordCalled = True
                  Return True
            End Function

            Public Overrides Sub EndCommit()
                  if not bBeginCommitCalled then Return 
                  if not bCommitRecordCalled then Return 
                  if _fileName="" then Return 
                  ' This is a Commit Phase success.
            End Sub

            Public Overrides Sub BeginAbort(fRecovery As Boolean)
                  bBeginAbortCalled = True
            End Sub
            
            Public Overrides Function AbortRecord(rec As LogRecord) _
                                                          As Boolean
                  bAbortRecordCalled = True
                  dim o as Object = rec.Record
                  _fileName = o.ToString()
                  Return True
            End Function

            Public Overrides Sub EndAbort()
                  if not bBeginAbortCalled then Return 
                  if not bAbortRecordCalled then Return 
                  if _fileName="" then Return
                  ' This is an Abort Phase success.
            End Sub
      End Class
End Namespace

using System;
using System.IO;
using System.Reflection;
using System.EnterpriseServices;
using System.EnterpriseServices.CompensatingResourceManager;

[assembly: ApplicationActivation(ActivationOption.Server)]
[assembly: ApplicationCrmEnabled]
[assembly: AssemblyKeyFile("crm.key")]

namespace CrmServer 
{
      [Transaction]
      // Create a Worker class.
      public class CRMWorker:ServicedComponent
      {
            public void CRMMethod(string fileName, bool bCommit)
            {
                  // Create clerk object.
                  Clerk clerk = new Clerk(typeof(CRMCompensator),
                       "CRMCompensator", CompensatorOptions.AllPhases);
                  clerk.WriteLogRecord(fileName);
                  clerk.ForceLog();
                  if (bCommit)
                        ContextUtil.SetComplete();
                  else
                        ContextUtil.SetAbort();
            }
      
      }
      // Create class derived from Compensator class.
      [JustInTimeActivation]
      public class CRMCompensator:Compensator
      {
            bool bBeginPrepareCalled = false;
            bool bPrepareRecordCalled = false;
            bool bBeginCommitCalled = false;
            bool bCommitRecordCalled = false;
            bool bBeginAbortCalled = false;
            bool bAbortRecordCalled = false;
      
            String _fileName;
      
            public override void BeginPrepare()
            {
                  bBeginPrepareCalled = true;
            }
      
            public override bool PrepareRecord(LogRecord rec)
            {
                  Object o = rec.Record;
                  _fileName = o.ToString();
                  bPrepareRecordCalled = true;
                  return false;
            }
      
            public override bool EndPrepare()
            {
                  if (!bBeginPrepareCalled)
                  {return false;}   
                  if (!bPrepareRecordCalled)
                  {return false;}   
                  if (_fileName==null)
                  {return false;}
                  // This is a Prepare Phase success.
                  return true;
            }
      
            public override void BeginCommit(bool fRecovery)
            {
                  bBeginCommitCalled = true;
            }
      
            public override bool CommitRecord(LogRecord rec)
            {
                  bCommitRecordCalled = true;
                  return true;
            }
      
            public override void EndCommit()
            {
                  if (!bBeginCommitCalled)
                  {return;}   
                  if (!bCommitRecordCalled)
                  {return;}
                  if (_fileName==null)
                  {return;}
                  // This is a Commit Phase success.
            }
      
            public override void BeginAbort(bool fRecovery)
            {
                  bBeginAbortCalled = true;
            }
      
            public override bool AbortRecord(LogRecord rec)
            {
                  bAbortRecordCalled = true;
                  Object o = rec.Record;
                  _fileName = o.ToString();
                  return true;
            }
      
            public override void EndAbort()
            {
                  if (!bBeginAbortCalled)
                  {return;}   
                  if (!bAbortRecordCalled)
                  {return;}               
                  if (_fileName==null)
                  {return;}
                  // This is an Abort Phase success.
            }
      
      }

}

Voir aussi

Référence

System.EnterpriseServices Namespace

Concepts

Résumé des services COM+ disponibles

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