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

   1 // PropagatorWrapperBlock.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
  26 using System;
  27 using System.Threading.Tasks;
  28 using System.Collections.Generic;
  29 using System.Collections.Concurrent;
  30
  31 namespace System.Threading.Tasks.Dataflow
  32 {
  33         internal class PropagatorWrapperBlock<TInput, TOutput> : IPropagatorBlock<TInput, TOutput>
  34         {
  35                 ITargetBlock<TInput> target;
  36                 ISourceBlock<TOutput> source;
  37                 CompletionHelper compHelper = CompletionHelper.GetNew ();
  38
  39                 public PropagatorWrapperBlock (ITargetBlock<TInput> target, ISourceBlock<TOutput> source)
  40                 {
  41                         this.target = target;
  42                         this.source = source;
  43                 }
  44
  45                 public DataflowMessageStatus OfferMessage (DataflowMessageHeader messageHeader,
  46                                                            TInput messageValue,
  47                                                            ISourceBlock<TInput> source,
  48                                                            bool consumeToAccept)
  49                 {
  50                         return target.OfferMessage (messageHeader, messageValue, source, consumeToAccept);
  51                 }
  52
  53                 public TOutput ConsumeMessage (DataflowMessageHeader messageHeader, ITargetBlock<TOutput> target, out bool messageConsumed)
  54                 {
  55                         return source.ConsumeMessage (messageHeader, target, out messageConsumed);
  56                 }
  57
  58                 public IDisposable LinkTo (ITargetBlock<TOutput> target, bool unlinkAfterOne)
  59                 {
  60                         return source.LinkTo (target, unlinkAfterOne);
  61                 }
  62
  63                 public void ReleaseReservation (DataflowMessageHeader messageHeader, ITargetBlock<TOutput> target)
  64                 {
  65                         source.ReleaseReservation (messageHeader, target);
  66                 }
  67
  68                 public bool ReserveMessage (DataflowMessageHeader messageHeader, ITargetBlock<TOutput> target)
  69                 {
  70                         return source.ReserveMessage (messageHeader, target);
  71                 }
  72
  73                 public void Complete ()
  74                 {
  75                         compHelper.Complete ();
  76                         source.Complete ();
  77                         target.Complete ();
  78                 }
  79
  80                 public void Fault (Exception ex)
  81                 {
  82                         compHelper.Fault (ex);
  83                         source.Fault (ex);
  84                         target.Fault (ex);
  85                 }
  86
  87                 public Task Completion {
  88                         get {
  89                                 return compHelper.Completion;
  90                         }
  91                 }
  92         }
  93 }
  94