. NET parallel Computing and Concurrency 11: concurrent Interface Iproducerconsumercollection

1 usingSystem;2 usingSystem.Collections;3 usingSystem.Collections.Generic;4 usingSystem.Collections.Concurrent;5 usingSystem.Linq;6 usingSystem.Threading;7 usingSystem.Threading.Tasks;8 9 Ten //Sample implementation of Iproducerconsumercollection (T) One //--In this case, a thread-safe stack. A  Public classSafestack<t>: iproducerconsumercollection<t> -{ -     //used for enforcing thread-safety the     Private ObjectM_lockobject =New Object(); -  -     //We 'll use the a regular old Stack for our core operations -     PrivateStack<t> M_sequentialstack =NULL; +  -     // +     //Constructors A     // at      PublicSafestack () -{ -M_sequentialstack =NewStack<t> (); -} -  -      PublicSafestack (ienumerable<t> Collection) in{ -M_sequentialstack =NewStack<t> (collection); to} +  -     // the     //Safe Push/pop Support *     // $      Public voidPush (T Item)Panax Notoginseng{ -         Lock(m_lockobject) M_sequentialstack.push (item); the} +  A      Public BOOLTrypop ( outT Item) the{ +         BOOLRval =true; -         Lock(M_lockobject) ${ $             if(M_sequentialstack.count = = 0) {item =default(T); Rval =false; } -             Elseitem = M_sequentialstack.pop (); -} the         returnRval; -}Wuyi  the     // -     //Iproducerconsumercollection (T) support Wu     // -      Public BOOLTryTake ( outT Item) About{ $         returnTrypop ( outItem); -} -  -      Public BOOLTryAdd (T Item) A{ +Push (item); the         return true;//Push doesn ' t fail -} $  the      PublicT[] ToArray () the{ thet[] Rval =NULL; the         Lock(m_lockobject) Rval = M_sequentialstack.toarray (); -         returnRval; in} the  the      Public voidCopyTo (t[] array,intIndex About{ the         Lock(m_lockobject) M_sequentialstack.copyto (array, index); the} the  +  -  the     //Bayi     //support for IEnumerable (T) the     // the      PublicIenumerator<t> GetEnumerator () -{ -         //The performance here is unfortunate for large stacks, the         //But thread-safety is effectively implemented. theStack<t> stackcopy =NULL; the         Lock(m_lockobject) Stackcopy =NewStack<t> (M_sequentialstack); the         returnStackcopy.getenumerator (); -} the  the  the     //94     // support for IEnumerable the     // theIEnumerator Ienumerable.getenumerator () the{98         return((ienumerable<t>) This). GetEnumerator (); About} - 101     // 102     // support for ICollection103     //104      Public BOOLIsSynchronized the{106         Get{return true; }107}108 109      Public ObjectSyncRoot the{111         Get{returnM_lockobject; } the}113  the      Public intCount the{ the         Get{returnM_sequentialstack.count; }117}118 119      Public voidCopyTo (array array,intIndex -{121         Lock(M_lockobject) ((ICollection) m_sequentialstack). CopyTo (array, index);122}123}124  the  Public classProgram126{127     Static voidMain () -{129Testsafestack (); the 131         //Keep the console window open in debug mode. theConsole.WriteLine ("Press any key to exit.");133Console.readkey ();134}135 136     //Test Our implementation of Iproducerconsumercollection (T)137     //demonstrates:138     //IPCC (T). TryAdd ()139     //IPCC (T). TryTake () $     //IPCC (T). CopyTo ()141     Static voidTestsafestack ()142{143safestack<int> stack =Newsafestack<int> ();144iproducerconsumercollection<int> IPCC = (iproducerconsumercollection<int>) stack;145 146         //Test Push ()/tryadd ()147Stack. Push (10); Console.WriteLine ("pushed ten");148IPCC. TryAdd (20); Console.WriteLine ("IPCC. tryadded");149Stack. Push (15); Console.WriteLine ("pushed"); Max 151         int[] Testarray =New int[3]; the 153         //Try CopyTo () within Boundaries154         Try155{156IPCC. CopyTo (Testarray, 0);157Console.WriteLine ("CopyTo () within boundaries worked, as expected");158}159         Catch(Exception e) the{161Console.WriteLine ("CopyTo () Within boundaries unexpectedly threw an exception: {0}", e.message);162}163 164         //Try CopyTo () that overflows165         Try166{167IPCC. CopyTo (Testarray, 1);168Console.WriteLine ("CopyTo () with index overflow worked, and it should not has");169} the         Catch(Exception e)171{172Console.WriteLine ("CopyTo () with index overflow threw an exception, as expected: {0}", e.message);173}174 175         //Test enumeration176Console.Write ("enumeration (should be three items):");177         foreach(intIteminchStack) Console.Write ("{0}", item);178Console.WriteLine ("");179  the         //Test Trypop ()181         intpopped = 0;182         if(Stack. Trypop ( outpopped))183{184Console.WriteLine ("successfully popped {0}", popped);185}186         ElseConsole.WriteLine ("FAILED to pop!!");187 188         //Test Count189Console.WriteLine ("stack count is {0}, should be 2", Stack. Count); the 191         //Test TryTake ()192         if(IPCC. TryTake ( outpopped))193{194Console.WriteLine ("successfully ipcc-trytaked {0}", popped);195}196         ElseConsole.WriteLine ("FAILED to the IPCC. trytake!!");197}198}199 

. NET parallel Computing and Concurrency 11: concurrent Interface Iproducerconsumercollection