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The example that follows demonstrates the use of the TransactionScopeActivity to group child activities into a single atomic unit of work. For this example, I ve chosen a simple transfer of funds from one account to another. The transfer involves two steps: a debit from one account and a credit to another. Both steps must succeed; otherwise, the transfer cannot take place. If either step fails, the entire transfer must be rolled back. To properly illustrate the transfer, the example uses a table in a SQL Server database to maintain the balance for the two accounts. A custom activity is developed that handles either a debit or a credit to a single account. The test workflow then includes two instances of this activity, one to process the debit and a second instance to handle the credit. Both of these instances are placed in a TransactionScopeActivity to ensure that they perform their work under the control of the same transaction. Before you implement this example, you will need to create the SQL Server database and the test table that are referenced by the example code. Please refer to the Preparing the ProWorkflow Database sidebar for the steps needed to accomplish this. The examples in this chapter also require a workflow persistence service. To set up a SQL Server database to be used for persistence, you can refer to the instructions in 4.

The examples in this chapter assume that you have a copy of SQL Server Express installed on your development machine. SQL Server Express is distributed with Visual Studio 2008 and is also available as a free download directly from Microsoft. A fully licensed version of SQL Server can also be used. However, the database connection strings shown in the example code assume that SQL Server Express is being used. Please make the appropriate adjustments to the connection strings if you are not using SQL Server Express. A database named ProWorkflow is used for all of the examples in this chapter. To create this database and also execute the SQL scripts needed to create and populate the test tables, you can use the sqlcmd command-line tool provided with SQL Server. Optionally, you can download a free copy of SQL Server Management Studio Express from Microsoft. This is a utility that allows you to graphically manage databases and objects within a database. First, save the following SQL script to a file named ProWorkflowCreate.sql. This script contains the statements that create the database and the tables needed by all of the examples in this chapter:

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Directory: Microsoft.PowerShell.Core\FileSystem::Z:\22 - PowerShel l Community Extensions\TestFolder

connectionStringName="ApplicationServerWorkflowInstanceStoreConnectionString" hostLockRenewalPeriod="00:00:30" runnableInstancesDetectionPeriod="00:00:05" instanceEncodingOption="None" instanceCompletionAction="DeleteAll" instanceLockedExceptionAction="NoRetry" /> </behavior> </serviceBehaviors> </behaviors> <diagnostics etwProviderId="4678ca55-f9bd-4f5e-bb78-8da3ef40e6a8"> <endToEndTracing propagateActivity="true" messageFlowTracing="true" /> </diagnostics> <tracking> <profiles> <trackingProfile name="ClaimProfile"> <workflow> <workflowInstanceQueries> <workflowInstanceQuery /> </workflowInstanceQueries> <activityStateQueries> <activityStateQuery> <states> <state name="Closed" /> </states> <variables> <variable name="saveResponse" /> <variable name="AppraisalEndpoint" /> </variables> </activityStateQuery> </activityStateQueries> </workflow> </trackingProfile> </profiles> </tracking> </system.serviceModel> <system.webServer> <modules runAllManagedModulesForAllRequests="true" /> </system.webServer> <microsoft.applicationServer> <monitoring> <default enabled="true" connectionStringName="ApplicationServerMonitoringConnectionString" monitoringLevel="Troubleshooting" /> </monitoring> </microsoft.applicationServer> </configuration> Note that sometimes as you execute configuration settings for monitoring and persistence of your WF services, you may encounter two configuration warnings (as shown in Figure 8-21).

USE [master] GO IF EXISTS (SELECT name FROM sys.databases WHERE name = N'ProWorkflow') DROP DATABASE [ProWorkflow] GO CREATE DATABASE [ProWorkflow] GO USE ProWorkflow GO SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[account]') AND type in (N'U'))

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BEGIN CREATE TABLE [dbo].[account]( [accountId] [int] NOT NULL, [description] [nvarchar](50) NULL, [balance] [money] NULL ) ON [PRIMARY] END GO SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[itemInventory]') AND type in (N'U')) BEGIN CREATE TABLE [dbo].[itemInventory]( [itemId] [int] NOT NULL, [description] [nvarchar](50) NULL, [qtyOnHand] [int] NULL ) ON [PRIMARY] END GO SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[orderDetail]') AND type in (N'U')) BEGIN CREATE TABLE [dbo].[orderDetail]( [orderId] [int] NOT NULL, [accountId] [int] NOT NULL, [itemId] [int] NOT NULL, [quantity] [int] NOT NULL ) ON [PRIMARY] END

After creating the database and the objects in it, you need to populate some of the tables with test data. To do this, you can save the following script to a file named PopulateTestTables.sql: USE [ProWorkflow] GO /* reset account table */ DELETE FROM [account] GO INSERT INTO [account] ([accountId],[description],[balance]) VALUES(1001, 'account 1', 100.00) GO

As the first warning message states, the workflow instance control is not functional until you enable the net.pipe protocol. The reason for this: AppFabric s Workflow Management Service (WMS) requires the net.pipe protocol to control the workflow instances.

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