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myQueue.Enqueue(i); } // create an array to make tracking the Tasks simpler Task[] taskArray = new Task[10]; // create and start the Tasks for (int i = 0; i < taskArray.Length; i++) { taskArray[i] = Task.Factory.StartNew(() => { while (myQueue.Count > 0) { // take an item from the queue int item = myQueue.Dequeue(); // increment the counter to report that we have taken an item IncrementCounter(); } }); } // wait for all of the Tasks to finish Task.WaitAll(taskArray); // print out the value of the counter Console.WriteLine("Items Processed: {0}", counter); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } private static void IncrementCounter() { lock (lockObject) { counter++; } } } Listing 24-27 creates a Queue<int> collection and populates it with 10,000 int values. Ten Tasks are created, the bodies of which enter a while loop whose condition is that the Queue<int> contains some items. On each loop iteration, the Dequeue method is called to remove an item from the collection. Each time a Task removes an item, it calls the IncrementCounter method that contains a critical region that safely updates a shared counter. When all of the Tasks have finished, the value of the shared counter is written to the console. If there are 10,000 items in the Queue<int>, you would hope that the counter value is also 10,000, showing that all of the items were removed by the Tasks. Of course, that isn t what you see. There are three possible outcomes and if you run Listing 24-27 over and over, you will quickly see them all. The first is the hoped-for result: there are 10,000 items in the collection and the counter value is 10,000. Here is the output of this outcome: Items Processed: 10000 Press enter to finish
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You may want to calculate the size of a particular bit of text before drawing to make sure the text will fit correctly or to align the text. The Font class possesses a ComputeExtent method that enables you to do this. The following code snippet will compute the size of a rectangle that is needed to show the text using the specified font. The method returns the two calculated width and height parameters. Because the method returns two parameters, it needs to use the out parameter construct to deliver the results instead of a single function return value. Font myFont = Resources.GetFont(Resources.FontResources.NinaB); int width, height; myFont.ComputeExtent("Hello world.", out width, out height);
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The base type for all delegates is System.Delegate, and we can use the members of this class to find out which methods a delegate will invoke on our behalf. Listing 10-7 contains an example. Listing 10-7. Interrogating Delegate Types using System; delegate int PerformCalc(int x, int y);
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The process in the destructor is similar to but shorter than that in the Dispose method. Just check to see whether the object has already been cleaned up, and if not, then release the unmanaged resources. Notice that in this case you do not call the Dispose methods of any managed resources, because the garbage collector might have already deleted those objects. class MyClass { bool disposed = false;
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You can see that the PrintCarDetails method doesn t require any parameters. We call such a method using the dot operator to combine the object reference and the method name, but we use empty parentheses (()) because there are no parameters, like this:
Within .NET, the principal object is the centerpiece for authorization. The object must implement System.Security.Principal.IPrincipal, which defines an Identity property and an IsInRole() method. Default implementations are implemented in Csla.Security. BusinessPrincipalBase, and so PTPrincipal inherits from that class: <Serializable()> _ Public Class PTPrincipal Inherits Csla.Security.BusinessPrincipalBase Principal objects typically have a constructor that accepts the identity object that represents the user s identity, and PTPrincipal is no exception: Private Sub New(ByVal identity As IIdentity) MyBase.New(identity) End Sub The BusinessPrincipalBase class also has a constructor that requires an identity object. This object is used to implement the Identity property in that base class, so it doesn t need to be implemented in PTPrincipal. The IsInRole() method is a bit more complex, however. To implement this method, the principal object must have the list of roles to which the user belongs. Of course, the identity object actually represents the user s identity and profile, and so it most likely contains the list of roles for the user as well. Certainly, that is how I choose to implement my custom objects, and so PTIdentity maintains the user s roles. This means that PTPrincipal can simply delegate the call to its identity object: Public Overrides Function IsInRole(ByVal role As String) As Boolean Dim identity As PTIdentity = DirectCast(Me.Identity, PTIdentity) Return identity.IsInRole(role) End Function The result indicates whether the user is in the specified role or not.
When connected to an Oracle instance running on a Windows server, where there is a single Oracle process per database instance with multiple process threads, SQL*Plus will output the following when ORADEBUG SETOSPID 3424 is executed: Oracle pid: 14, Windows thread id: 3424, image: ORACLE.EXE (SHAD) The ORADEBUG SETORAPID 14 command executed in Oracle running on Linux will output the following: Oracle pid: 14, Unix process pid: 3424, image: oracle (TNS V1-V3) A couple of other ORADEBUG commands are helpful when dumping information. The following sets an unlimited maximum trace file size for the attached process: SQL> ORADEBUG UNLIMIT The following closes the trace file for the attached process: SQL> ORADEBUG CLOSE_TRACE The following displays the trace filename for the attached process (the column TRACEFILE in the view V$PROCESS starting with Oracle 11.1 also shows the trace filename): SQL> ORADEBUG TRACEFILE_NAME To display a list of commands for ORADEBUG, use the following command: SQL> ORADEBUG HELP
Look Up: Is It a Decorator, Is It a Composite
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