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The task manager implements the ITaskManager interface, and the interface has a single method, making the task manager an easy implementation, albeit lacking in functionality As described in the beginning of this chapter, the task manager on the server has been responsible for managing the tasks to be executed and their results Executing the tasks and managing their results requires that the task manager be able to juggle multiple threads and to manage collections of objects EBVN I will explain the task manager not as one code segment, but multiple smaller segments: overall class structure, task management, and results management.

I could have combined the following functionality with the CreateSites routine, but by keeping them Tip

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The overall class structure is similar to the following class declaration: public class TaskManagerImpl : ITaskManager { private Queue<ITask> _tasks = new Queue< ITask>(); private Queue<ITask> _completedTasks = new Queue< ITask>(); private Queue<IResult> _results = new Queue< IResult>(); private Thread _thread = null; public TaskManagerImpl( ) { } } The class TaskManagerImpl implements the ITaskManager interface, where the method to be implemented will be discussed shortly In the overall class structure, the important pieces are the data members There are four data members: _tasks, _completedTasks, _results, and _thread Other than the _thread data member, the other data members are Queue<> typed lists The Queue<> list is being used because a producer-consumer threading architecture is implemented In a producer-consumer architecture, there is a producer of data and a consumer of data The producer-consumer architecture strictly requires that only one thread can produce data, and another thread consumes data.

The Clock app automatically launches when Nexus One phones are placed in the dock accessory, and other phones may have similar accessories. It s also an alarm you don t have to turn off on weekends, because it will remember to let you sleep. Launch the Clock app in Android 2.1 and above, and you ll notice that it lists the current time and weather. It also has four buttons on the bottom, as shown in Figure 13 4. One for alarms, one for slideshow photos, one for music, and a Home button for returning to the Home screen. The button at the upper right dims the contrast on the screen to let you get to sleep and keep the screen from being damaged. If you leave the Clock app running for a while, it will also automatically dim. Many versions also display weather information, so you know whether to wear your jacket as you leave for work. Click the alarm button, and you ll see a list of possible alarm times, as shown in Figure 13 5. Alarms that are active have a green indicator light. Because you can have many different alarms, you can keep alarms you only need occasionally and only turn them on when needed. Need to get up an hour early Just tap on the alarm once to activate it.

The dedication of functionality makes it simpler and more efficient to manage objects between multiple threads The data member _tasks contains the list of tasks to be executed The data member _completedTasks contains the list of tasks that have been completed The idea of these two data members is to retrieve a task from the _task.

The driver application is quite simple: it runs the CreateSites application iteratively, once for each customer in the Northwind.Customers table. Let s take a look at how Listing 9-8, when executed, gets a list of customers, creates a site for each customer in the list, and updates each customer s record indicating that a site was created. Listing 9-8. Driver Application to Process Multiple Sites Private strSiteRequestConnectionString As String = "user id=Northwind_test_user;" & "data source=(local);persist security info=False; " & _ "initial catalog=Northwind" Private con As New SqlClient.SqlConnection(strSiteRequestConnectionString) Private sql As New SqlClient.SqlCommand ' Get a list of all customers without extranet sites Private da As New SqlClient.SqlDataAdapter( _ "select * from Customers where Status='' " & _ "or Status IS NULL order by CustomerID", _ strSiteRequestConnectionString) Private ds As New DataSet Private dr As DataRow Sub Main() da.Fill(ds) 'Loop through SiteRequest queue, processing all requests with a 'Pending' 'status. For Each dr In ds.Tables(0).Rows Try 'Call our CreateSites command with the CustomerID of the customer that needs a site. Shell("C:\Documents and Settings\Administrator\My Documents\" & _ "Visual Studio Projects\CreateSites\bin\CreateSites.exe " & _ "dr(0) & " " & dr(1) & "", AppWinStyle.Hide, True) UpdateRequestStatus(dr("CustomerID"), "Complete", "") Catch ex As Exception UpdateRequestStatus(dr("CustomerID"), "Failed", ex.Message) End Try Next

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