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Figure 7-8. The process of a method call to queued component Creating queued components is a little more involved than some of the other features of COM+. You ll need to do specific configurations on the server and on the client. You must add an assembly-level attribute to the assembly containing your components to queue. Finally, you must define an interface with all the methods you re planning to queue for a component, and then your Serviced Component must implement the interface. When a client creates an instance of the component, it won t automatically call it using queuing. The good part about this is that the client has the flexibility to call the component in a queued manner or not. The downside is the need to write some specific code to leverage the queuing functionality. (You can find this queuing code in the Client and Server projects in the QCDemo directory of the Code07 solution.) Let s start by taking a look at the assembly-level attribute that must be present. [assembly: ApplicationQueuing(Enabled = true, QueueListenerEnabled = true)] This sets up the application containing the component so that it can be queued. You can control the maximum number of listener threads with the attribute as well. The default is 16 per processor on the hosting machine.
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Next you need to define an interface that you ll bind your queued messages to. An interface is necessary because you re using a COM-based technology, and all COM objects implement at least one interface. Queuing is, therefore, exposed on an interface-specific level of scope. So your Serviced Component must explicitly implement an interface, which your client will use to bind to and leverage the queued behavior. You ll define an interface containing a single method. Remember that methods on this interface will not be able to return values; therefore, any method used with queuing must be declared as returning void. public interface IQueuable { void executeSQL(string sql); } Now you ll create a Serviced Component that implements this interface: [InterfaceQueuing(Interface = "IQueuable")] public class QCDemo : ServicedComponent, IQueuable { public QCDemo() {} public void executeSQL(string sql) { try { SqlCommand cm = new SqlCommand(sql, new SqlConnection(ConnStr)); cm.Connection.Open(); cm.ExecuteNonQuery(); } finally { cm.Connection.Close(); } } } Notice you have decorated the type with the InterfaceQueuing attribute. With this attribute you re declaring your intent to use the named interface with in a queued manner. This will affect how the component gets configured (see Figure 7-9).
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Figure 7-9. An interface configured for queuing Your class is then declared as inheriting from ServicedComponent and implementing IQueuing. Clients will now have the choice of invoking this type via queuing or not. Here s a simple application to test your component: static void Main(string[] args) { string sql = "insert into jobs ( job_desc, min_lvl, max_lvl) " + "values ('Some job',10,250)"; QCDemo o = new QCDemo(); o.Dispose(); Console.Write("Component registered. Press enter to invoke"); Console.ReadLine(); IQueuable qable; try { qable = (IQueuable)Marshal.BindToMoniker ("queue:/new:Server.QCDemo"); for(int i = 0; i < 100; i++) qable.executeSQL(sql); } finally { Marshal.ReleaseComObject(qable); } }
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Configuration of a queued component can take a long time. Since you re relying on lazy registration (see the Configuration section a bit later in this chapter), your first block of code creates an instance of the type specifically for the purpose of registering it in COM+. You then declare an instance of the IQueuable interface and instantiate by using the Marshal.BindToMoniker method. This method lives in the System.Runtime.InteropServices namespace, which must be imported with a using statement. The string passed to it has the fully qualified name of the type built into the tail end of it, which is how the BindToMoniker method knows the proper type to create. The Serviced Component infrastructure takes care of the rest. Your code proceeds to call the executeSQL method 99 times. These method calls do not wait for the work of the insert statements to get done. Execution continues (and in our case, the application terminates) while the database work is picked up off the queue by the COM+ listener and executes asynchronously independently from our application. The last thing you do is explicitly destroy the COM object by calling ReleaseComObject (another static method on the Marshal type).
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