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public void StopTask() { // Perform no operation if task isn't running. if (status != StatusState.InProgress) return; // Try the polite approach. if (cancelWaitTime != TimeSpan.Zero) { DateTime startTime = DateTime.Now; while (DateTime.Now.Subtract(startTime).TotalSeconds > cancelWaitTime) { // Still waiting for the time limit to pass. // Allow other threads to do some work. Thread.Sleep(TimeSpan.FromSeconds(cancelCheckInterval)); } } // Use the forced approach. thread.Abort(); } You could use a similar approach to implement the Pause() and Resume() methods. The next refinement is progress tracking. If your derived class supports progress reporting, it should set the SupportsProgress property to true. It can then supply the percentage complete through the protected progress variable. private bool supportsProgress = false; protected bool SupportsProgress { get { return supportsProgress; } set { supportsProgress = value; } } protected int progress; public int Progress { get { if (!supportsProgress) throw new InvalidOperationException( "This worker does not report progess."); else return progress; } } You ll see progress reporting in the next example.

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There s still a lot more you can do with this example. One improvement would be to implement some form of task queuing. This approach prevents the possibility that the user might start a huge number of threads running simultaneously, ensuring that none can get enough system resources to finish their work (a problem known as thread starvation). Instead, you allow only a set number of threads to work at once. Once you reach the limit, you add any additional requests to a queue and execute them only when a thread becomes available. To manage this work, you need to replace the simple collection of worker threads (from the previous example) with a dedicated class that wraps the queuing and thread management work. This model requires too much code to show it all here, but you can see the complete code in the downloadable examples for this chapter.

used.</item> <item>For provider name "System.Data.OracleClient", or for a provider of type <see cref="System.Data.OracleClient.OracleClientFactory"/>, the <see cref="Microsoft.Practices.EnterpriseLibrary.Data.Oracle.OracleDatabase"/> will be used.</item> <item>For provider name "Oracle.DataAccess.Client", or for a provider of type <see cref="OracleClientFactory"/>, the <see cref="Microsoft.Practices.EnterpriseLibrary.Data.OracleNET.OracleNETDatabase"/> will be used.</item> <item>In any other case, the <see cref="GenericDatabase"/> will be used.</item> </list> </para> </remarks> <seealso cref="DatabaseConfigurationView.GetProviderMapping(string, string)"/> <seealso cref="System.Data.Common.DbProviderFactory"/> .

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Note You can also use the ThreadPool class from the System.Threading namespace for a simple implementation of thread queuing that uses threads from the CLR s pool. However, the ThreadPool doesn t give you much flexibility for example, you can t stop tasks, report progress, control how many tasks execute at once, and change priorities. However, the ThreadPool implementation is still better than the example you ll consider in this section in one respect. Because it reuses threads for more than one task, you avoid the overhead of creating new threads.

The basic idea is that your form uses a new TaskManager class. The TaskManager class derives from Component, so it can be added to a form at design time. This makes it easy to hook up event handlers. public class TaskManager : System.ComponentModel.Component { ... } The TaskManager allows you to choose how many tasks can be performed at a time through a MaxThreads property: private int maxThreads = 2; public int MaxThreads { get { return maxThreads; } set { maxThreads = value; } } The TaskManager class wraps three ThreadWrapper collections. These collections reflect tasks that are queued, currently underway, and completed: // Track ongoing workers. List<ThreadWrapper> workers = new List<ThreadWrapper>(); // Track queued requests. List<ThreadWrapper> workersQueued = new List<ThreadWrapper>(); // Task completed requests. List<ThreadWrapper> workersCompleted = new List<ThreadWrapper>();

In the same class, search for the section shown in Listing 13-5. Add a new constant for the ODP.NET assembly name, which is shown in bold here. Listing 13-5. Adding a New Constant in the DBProviderMapping.cs File

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