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

   1 // PropagatorWrapperBlock.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 namespace System.Threading.Tasks.Dataflow {
  25         /// <summary>
  26         /// Block returned by <see cref="DataflowBlock.Encapsulate{TInput,TOutput}"/>.
  27         /// </summary>
  28         class PropagatorWrapperBlock<TInput, TOutput> :
  29                 IPropagatorBlock<TInput, TOutput> {
  30                 readonly ITargetBlock<TInput> targetBlock;
  31                 readonly ISourceBlock<TOutput> sourceBlock;
  32
  33                 public PropagatorWrapperBlock (
  34                         ITargetBlock<TInput> target, ISourceBlock<TOutput> source)
  35                 {
  36                         if (target == null)
  37                                 throw new ArgumentNullException ("target");
  38                         if (source == null)
  39                                 throw new ArgumentNullException ("source");
  40
  41                         targetBlock = target;
  42                         sourceBlock = source;
  43                 }
  44
  45                 public DataflowMessageStatus OfferMessage (
  46                         DataflowMessageHeader messageHeader, TInput messageValue,
  47                         ISourceBlock<TInput> source, bool consumeToAccept)
  48                 {
  49                         return targetBlock.OfferMessage (
  50                                 messageHeader, messageValue, source, consumeToAccept);
  51                 }
  52
  53                 public TOutput ConsumeMessage (
  54                         DataflowMessageHeader messageHeader, ITargetBlock<TOutput> target,
  55                         out bool messageConsumed)
  56                 {
  57                         return sourceBlock.ConsumeMessage (messageHeader, target, out messageConsumed);
  58                 }
  59
  60                 public IDisposable LinkTo (
  61                         ITargetBlock<TOutput> target, DataflowLinkOptions linkOptions)
  62                 {
  63                         return sourceBlock.LinkTo (target, linkOptions);
  64                 }
  65
  66                 public void ReleaseReservation (
  67                         DataflowMessageHeader messageHeader, ITargetBlock<TOutput> target)
  68                 {
  69                         sourceBlock.ReleaseReservation (messageHeader, target);
  70                 }
  71
  72                 public bool ReserveMessage (
  73                         DataflowMessageHeader messageHeader, ITargetBlock<TOutput> target)
  74                 {
  75                         return sourceBlock.ReserveMessage (messageHeader, target);
  76                 }
  77
  78                 public void Complete ()
  79                 {
  80                         targetBlock.Complete ();
  81                 }
  82
  83                 public void Fault (Exception exception)
  84                 {
  85                         targetBlock.Fault (exception);
  86                 }
  87
  88                 public Task Completion {
  89                         get { return sourceBlock.Completion; }
  90                 }
  91         }
  92 }