November 2020
Intermediate to advanced
226 pages
5h 34m
Chinese
Content preview from C#并发编程经典实例（第2版）
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122
｜
第
9
章
// 在添加
13
之前，该添加操作等待
7
被移除
queue.Add(13);
queue.CompleteAdding();
讨论
当生产者比消费者运行得快时，节流就很重要了。我们必须考虑这个问题：当应用程序在
其他与本地硬件不同的硬件上运行时，生产者是否会比消费者运行得快？为了确保应用程
序能在未来的硬件和云实例上运行，一定程度的节流通常是很有必要的。相比开发机来
说，这些环境的限制往往更多。
节流会对生产者造成背压，通过减缓它们来确保消费者能处理所有项，而不会导致内存压
力过大。如果无须处理所有项，那么可以选择采样而不是节流。关于采样生产者队列（或
消费者队列），参阅
9.10
节。
可以从
System.Threading.Channels
NuGet
包中获取通道，从
System.Threading.
Tasks.Dataflow
NuGet
包中获取
BufferBlock<T>
类型，从
Nito.AsyncEx
NuGet
包中获取
AsyncProducerConsumerQueue<T>
类型。
参阅
9.6
节探讨同步生产者队列（或消费者队列）的基本用法。
9.8
节探讨异步生产者队列（或消费者队列）的基本用法。
9.10
节探讨节流的一种替代方案，即采样生产者队列（或消费者队列）。
9.10
采样队列
问题
假设有生产者队列和消费者队列，但是生产者可能比消费者运行得快，于是造成了不必要
的内存使用。你并不需要保留所有的队列项，现在需要设法过滤队列项，让运行较慢的生
产者只需要处理那些重要项。
解决方案 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.