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 //
  24
  25 using System.Collections.Concurrent;
  26
  27 namespace System.Threading.Tasks.Dataflow {
  28         internal class JoinTarget<TTarget> : MessageBox<TTarget>, ITargetBlock<TTarget>
  29         {
  30                 readonly IDataflowBlock joinBlock;
  31                 readonly Action signal;
  32
  33                 public JoinTarget (IDataflowBlock joinBlock, Action signal, CompletionHelper helper,
  34                                    Func<bool> externalCompleteTester)
  35                         : base (new BlockingCollection<TTarget> (), helper, externalCompleteTester)
  36                 {
  37                         this.joinBlock = joinBlock;
  38                         this.signal = signal;
  39                 }
  40
  41                 protected override void EnsureProcessing ()
  42                 {
  43                         signal ();
  44                 }
  45
  46                 public BlockingCollection<TTarget> Buffer {
  47                         get {
  48                                 return MessageQueue;
  49                         }
  50                 }
  51
  52                 DataflowMessageStatus ITargetBlock<TTarget>.OfferMessage (DataflowMessageHeader messageHeader,
  53                                                                           TTarget messageValue,
  54                                                                           ISourceBlock<TTarget> source,
  55                                                                           bool consumeToAccept)
  56                 {
  57                         return OfferMessage (this, messageHeader, messageValue, source, consumeToAccept);
  58                 }
  59
  60                 void IDataflowBlock.Complete ()
  61                 {
  62                         Complete ();
  63                 }
  64
  65                 Task IDataflowBlock.Completion {
  66                         get {
  67                                 return joinBlock.Completion;
  68                         }
  69                 }
  70
  71                 void IDataflowBlock.Fault (Exception e)
  72                 {
  73                         joinBlock.Fault (e);
  74                 }
  75         }
  76 }