1 // PassingMessageBox.cs
3 // Copyright (c) 2011 Jérémie "garuma" Laval
4 // Copyright (c) 2012 Petr Onderka
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:
13 // The above copyright notice and this permission notice shall be included in
14 // all copies or substantial portions of the Software.
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
24 using System.Collections.Concurrent;
26 namespace System.Threading.Tasks.Dataflow {
28 /// Message box for blocks that don't need any special processing of incoming items.
30 class PassingMessageBox<TInput> : MessageBox<TInput> {
31 readonly Action<bool> processQueue;
33 public PassingMessageBox (
34 ITargetBlock<TInput> target, BlockingCollection<TInput> messageQueue,
35 CompletionHelper compHelper, Func<bool> externalCompleteTester,
36 Action<bool> processQueue, DataflowBlockOptions dataflowBlockOptions,
37 bool greedy = true, Func<bool> canAccept = null)
38 : base (target, messageQueue, compHelper, externalCompleteTester,
39 dataflowBlockOptions, greedy, canAccept)
41 this.processQueue = processQueue;
45 /// Makes sure the input queue is processed the way it needs to.
46 /// Executes synchronously, so shouldn't cause any long processing.
48 /// <param name="newItem">Was new item just added?</param>
49 protected override void EnsureProcessing (bool newItem)
51 processQueue (newItem);