67 lines
2.3 KiB
C#
67 lines
2.3 KiB
C#
// NullTargetBlock.cs
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//
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// Copyright (c) 2012 Petr Onderka
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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namespace System.Threading.Tasks.Dataflow {
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/// <summary>
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/// Target block returned by <see cref="DataflowBlock.NullTarget{TInput}"/>.
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/// </summary>
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class NullTargetBlock<TInput> : ITargetBlock<TInput> {
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public NullTargetBlock ()
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{
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Completion = new TaskCompletionSource<bool> ().Task;
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}
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public DataflowMessageStatus OfferMessage (
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DataflowMessageHeader messageHeader, TInput messageValue,
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ISourceBlock<TInput> source, bool consumeToAccept)
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{
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if (!messageHeader.IsValid)
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throw new ArgumentException ("The messageHeader is not valid.",
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"messageHeader");
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if (consumeToAccept && source == null)
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throw new ArgumentException (
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"consumeToAccept may only be true if provided with a non-null source.",
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"consumeToAccept");
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if (consumeToAccept) {
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if (!source.ReserveMessage (messageHeader, this))
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return DataflowMessageStatus.NotAvailable;
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bool consummed;
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source.ConsumeMessage (messageHeader, this, out consummed);
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if (!consummed)
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return DataflowMessageStatus.NotAvailable;
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}
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return DataflowMessageStatus.Accepted;
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}
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public Task Completion { get; private set; }
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public void Complete ()
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{
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}
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public void Fault (Exception exception)
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{
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}
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}
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} |