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The dependency properties required by this activity are the following: SalesItemId: An Int32 that identifies the product to be validated IsSalesItemVerified: A Boolean that indicates whether the SalesItemId is valid SalesItemAmount: A Decimal that contains the cost of the product /// <summary> /// Validate the product ID and determine the product cost /// </summary> /// <param name="executionContext"></param> /// <returns></returns> protected override ActivityExecutionStatus Execute( ActivityExecutionContext executionContext) { //simulate an item lookup to retrieve the sales amount switch (SalesItemId) { case 501: IsSalesItemVerified = true; SalesItemAmount = 59.95M; break; case 502: IsSalesItemVerified = true; SalesItemAmount = 199.99M; break; default: IsSalesItemVerified = false; SalesItemAmount = 0; break; } return base.Execute(executionContext); } } } The Execute method contains the business logic for this activity. If the SalesItemId value is valid, the IsSalesItemVerified property is set to true and the SalesItemAmount property is set to an example product cost. Otherwise, IsSalesItemVerified is set to false.

Now assume something goes wrong with one of the servers in the farm and that server shuts down. Obviously, the bad news is that you must recover from the crash on that machine and possibly rebuild it or replace it with another server. The good news, however, is that your server farm has never stopped working. It continues to process messages and deliver data in and out to all the services and workflows deployed into this farm, as long as you have at least one AppFabric server and one SQL Server database node running your workflow service instances and other monitoring data. This highly available scenario becomes possible thanks to the AppFabric Instance Recovery and Durable Timer services provided to you out-of-the-box as part of the AppFabric Runtime Service components, which were described in detail in 4. If one of your servers goes down, these built-in services make sure that your workflow continues from the last known persisted point on another available server in the farm. Now consider the scenario where a WF service instance is prematurely terminated. AppFabric s WMS will detect that the instance should be running, and it will restart it on another machine in the farm. AppFabric also deals with orphan messages in a graceful manner. An orphan message is one that cannot be consumed by its correlated WF instance because the message was routed into a different machine in a server farm. Instead of throwing an exception, AppFabric will retry for a configurable timeout period to obtain a lock on the instance, load it on the local machine, and then pass the orphan message to the correct instance.

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The event log infrastructure recognizes the concept of logs, or files that are basically containers for event log entries or messages. A system will have several default logs that were created at installation time, plus zero or more custom event logs. For example, any Windows system has the Application, Security, and System event logs. PowerShell s installation adds another the Windows PowerShell log. The primary tool that system administrators use for viewing messages is the Windows Event Viewer control panel. It is available under the Administrative Tools section, which you can reach via both the Start menu and the Control Panel. Figure 16-1 shows a screen shot of the Windows Event Viewer management snap-in.

The final custom activity simulates entering the order. It really doesn t need to do much, other than to prove that the workflow reached this critical point with all of the correct property values. Add another activity to the project, name it EnterOrderActivity, and change the base class from SequenceActivity to Activity. Listing 3-6 shows the complete EnterOrderActivity.cs file. Listing 3-6. Complete EnterOrderActivity.cs File using using using using System; System.ComponentModel; System.Workflow.ComponentModel; System.Workflow.Activities;

namespace OrderEntryActivities { /// <summary> /// Enter a validated order /// </summary> public partial class EnterOrderActivity : Activity { public EnterOrderActivity() { InitializeComponent(); } #region Public workflow properties public static DependencyProperty AccountIdProperty = System.Workflow.ComponentModel.DependencyProperty.Register( "AccountId", typeof(Int32), typeof(EnterOrderActivity)); /// <summary> /// Identifies the account /// </summary> [Description("Identifies the account")] [Category("Custom Activity Example")] [Browsable(true)] [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)] public Int32 AccountId { get { return ((Int32)(base.GetValue( EnterOrderActivity.AccountIdProperty))); } set { base.SetValue(EnterOrderActivity.AccountIdProperty, value); } } public static DependencyProperty SalesItemIdProperty = System.Workflow.ComponentModel.DependencyProperty.Register( "SalesItemId", typeof(Int32), typeof(EnterOrderActivity)); /// <summary> /// Identifies the product /// </summary> [Description("Identifies the product")] [Category("Custom Activity Example")] [Browsable(true)] [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

The Event Viewer is a nice and powerful application, but it does little to help us in our scripting needs. There is no way to use it from a PowerShell script to get event log entries, so fortunately, PowerShell offers a separate cmdlet that is the entry point of all event-log-related operations Get-EventLog. The first thing that we need to do is get a list of all event logs on the system. We can do that using the -List cmdlet switch: PS> Get-EventLog -List Max(K) Retain OverflowAction Entries Name

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