在上一篇文章演示了并行的流水線操作（生產者和消費者并行同時執行），C#是通過BlockingCollection這個線程安全的對象作為Buffer，并且結合Task來實現的。但是上一篇文章有個缺陷，在整個流水線上，生產者和消費者是唯一的。本文將演示多個消費者多個生產者同時并行執行。
與前一篇文章演示的流水線思想類似，不同之處就是本文的topic：消費者和生產者有多個，以buffer1為例，起生產者有兩個，消費者有兩個，現在有三個緯度的并行：
class PiplelineDemo { PRivate int seed; public PiplelineDemo() { seed = 10; } public void Action11(BlockingCollection<string> output) { for (var i = 0; i < seed; i++) { output.Add(i.ToString());//initialize data to buffer1 } } public void Action12(BlockingCollection<string> output) { for (var i = 0; i < seed; i++) { output.Add(i.ToString());//initialize data to buffer1 } } public void Action21(BlockingCollection<string> input, BlockingCollection<string> output) { foreach (var item in input.GetConsumingEnumerable()) { var itemToInt = int.Parse(item); output.Add((itemToInt * itemToInt).ToString());// add new data to buffer2 } } public void Action22(BlockingCollection<string> input, BlockingCollection<string> output) { foreach (var item in input.GetConsumingEnumerable()) { var itemToInt = int.Parse(item); output.Add((itemToInt * itemToInt).ToString());// add new data to buffer2 } } public void Action31(BlockingCollection<string> input, BlockingCollection<string> output) { foreach (var item in input.GetConsumingEnumerable()) { output.Add((item));// add new data to buffer3 } } public void Action32(BlockingCollection<string> input, BlockingCollection<string> output) { foreach (var item in input.GetConsumingEnumerable()) { output.Add((item));// add new data to buffer3 } } public void Pipeline() { var buffer1 = new BlockingCollection<string>(seed * 2); var buffer2 = new BlockingCollection<string>(seed * 2); var buffer3 = new BlockingCollection<string>(seed * 2); var taskFactory = new TaskFactory(TaskCreationOptions.LongRunning, TaskContinuationOptions.None); var stage11 = taskFactory.StartNew(() => Action11(buffer1)); var stage12 = taskFactory.StartNew(() => Action12(buffer1)); Task.Factory.ContinueWhenAll(new Task[] { stage11, stage12 }, (tasks) => { buffer1.CompleteAdding(); }); var stage21 = taskFactory.StartNew(() => Action21(buffer1, buffer2)); var stage22 = taskFactory.StartNew(() => Action22(buffer1, buffer2)); Task.Factory.ContinueWhenAll(new Task[] { stage21, stage22 }, (tasks) => { buffer2.CompleteAdding(); }); var stage31 = taskFactory.StartNew(() => Action31(buffer2, buffer3)); var stage32 = taskFactory.StartNew(() => Action32(buffer2, buffer3)); Task.Factory.ContinueWhenAll(new Task[] { stage31, stage32 }, (tasks) => { buffer3.CompleteAdding(); }); Task.WaitAll(stage11, stage12, stage21, stage22, stage31, stage32); foreach (var item in buffer3.GetConsumingEnumerable())//print data in buffer3 { Console.WriteLine(item); } } }
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