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

   1 // JoinBlock.cs
   2 //
   3 // Copyright (c) 2011 Jérémie "garuma" Laval
   4 //
   5 // Permission is hereby granted, free of charge, to any person obtaining a copy
   6 // of this software and associated documentation files (the "Software"), to deal
   7 // in the Software without restriction, including without limitation the rights
   8 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   9 // copies of the Software, and to permit persons to whom the Software is
  10 // furnished to do so, subject to the following conditions:
  11 //
  12 // The above copyright notice and this permission notice shall be included in
  13 // all copies or substantial portions of the Software.
  14 //
  15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  21 // THE SOFTWARE.
  22
  23 using System.Collections.Concurrent;
  24
  25 namespace System.Threading.Tasks.Dataflow {
  26         internal class JoinTarget<TTarget> : MessageBox<TTarget>, ITargetBlock<TTarget>
  27         {
  28                 readonly IDataflowBlock joinBlock;
  29                 readonly Action signal;
  30
  31                 public JoinTarget (
  32                         IDataflowBlock joinBlock, Action signal, CompletionHelper helper,
  33                         Func<bool> externalCompleteTester, DataflowBlockOptions options,
  34                         bool greedy)
  35                         : base (null, new BlockingCollection<TTarget> (), helper, externalCompleteTester,
  36                                 options, greedy)
  37                 {
  38                         this.joinBlock = joinBlock;
  39                         this.signal = signal;
  40                         Target = this;
  41                 }
  42
  43                 protected override void EnsureProcessing (bool newItem)
  44                 {
  45                         signal ();
  46                 }
  47
  48                 public BlockingCollection<TTarget> Buffer {
  49                         get {
  50                                 return MessageQueue;
  51                         }
  52                 }
  53
  54                 DataflowMessageStatus ITargetBlock<TTarget>.OfferMessage (DataflowMessageHeader messageHeader,
  55                                                                           TTarget messageValue,
  56                                                                           ISourceBlock<TTarget> source,
  57                                                                           bool consumeToAccept)
  58                 {
  59                         return OfferMessage (messageHeader, messageValue, source, consumeToAccept);
  60                 }
  61
  62                 void IDataflowBlock.Complete ()
  63                 {
  64                         Complete ();
  65                 }
  66
  67                 Task IDataflowBlock.Completion {
  68                         get {
  69                                 throw new NotSupportedException();
  70                         }
  71                 }
  72
  73                 void IDataflowBlock.Fault (Exception e)
  74                 {
  75                         joinBlock.Fault (e);
  76                 }
  77         }
  78 }