mcs/class/System.Threading.Tasks.Dataflow/System.Threading.Tasks.Dataflow/ExecutingMessageBox.cs

   1 // ExecutingMessageBox.cs
   2 //
   3 // Copyright (c) 2011 Jérémie "garuma" Laval
   4 // Copyright (c) 2012 Petr Onderka
   5 //
   6 // Permission is hereby granted, free of charge, to any person obtaining a copy
   7 // of this software and associated documentation files (the "Software"), to deal
   8 // in the Software without restriction, including without limitation the rights
   9 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 // copies of the Software, and to permit persons to whom the Software is
  11 // furnished to do so, subject to the following conditions:
  12 //
  13 // The above copyright notice and this permission notice shall be included in
  14 // all copies or substantial portions of the Software.
  15 //
  16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22 // THE SOFTWARE.
  23
  24 using System.Collections.Concurrent;
  25
  26 namespace System.Threading.Tasks.Dataflow {
  27         /// <summary>
  28         /// Message box for executing blocks with synchrnous actions.
  29         /// </summary>
  30         /// <typeparam name="TInput">Type of the item the block is processing.</typeparam>
  31         class ExecutingMessageBox<TInput> : ExecutingMessageBoxBase<TInput> {
  32                 readonly Func<bool> processItem;
  33
  34                 public ExecutingMessageBox (
  35                         ITargetBlock<TInput> target, BlockingCollection<TInput> messageQueue,
  36                         CompletionHelper compHelper, Func<bool> externalCompleteTester,
  37                         Func<bool> processItem, Action outgoingQueueComplete,
  38                         ExecutionDataflowBlockOptions options)
  39                         : base (
  40                                 target, messageQueue, compHelper, externalCompleteTester,
  41                                 outgoingQueueComplete, options)
  42                 {
  43                         this.processItem = processItem;
  44                 }
  45
  46                 /// <summary>
  47                 /// Processes the input queue of the block.
  48                 /// </summary>
  49                 protected override void ProcessQueue ()
  50                 {
  51                         StartProcessQueue ();
  52
  53                         try {
  54                                 int i = 0;
  55                                 while (CanRun (i)) {
  56                                         if (!processItem ())
  57                                                 break;
  58                                         i++;
  59                                 }
  60                         } catch (Exception e) {
  61                                 CompHelper.RequestFault (e, false);
  62                         }
  63
  64                         FinishProcessQueue ();
  65                 }
  66         }
  67 }