[英]Using BlockingCollection(T) on existing IProducerConsumerCollection(T)
I'm exposing an IProducerConsumerCollection(T)
from an interface that will periodically add items for another thread to consume. 我正在从接口中暴露IProducerConsumerCollection(T)
,该接口将定期添加项目以供另一个线程使用。
public interface IProducer<T>
{
IProducerConsumerCollection<T> ProducerCollection { get; }
}
I was trying to use a BlockingCollection(T)
with the existing collection, but it appears that adding to the IProducerConsumerCollection(T)
directly is not supported: 我试图将BlockingCollection(T)
与现有集合一起使用,但是似乎不支持直接添加到IProducerConsumerCollection(T)
:
var queue = new ConcurrentQueue<string>();
var blockingCollection = new BlockingCollection<string>(queue);
var task1 = Task.Run(() => {
Console.WriteLine("Dequeued " + blockingCollection.Take());
Console.WriteLine("Dequeued " + blockingCollection.Take());
});
var task2 = Task.Run(() => {
Console.WriteLine("Enqueueing Hello");
queue.Enqueue("Hello");
Console.WriteLine("Enqueueing World");
queue.Enqueue("World");
});
Task.WaitAll(task1, task2);
This will hang indefinitely as the BlockingCollection(T)
will not notice the new items. 这将无限期地挂起,因为BlockingCollection(T)
将不会注意到新项。
Is there similar functionality to the BlockingCollection(T).Take
method or is there anything simpler than: 是否具有与BlockingCollection(T).Take
方法类似的功能,或者有什么比以下方法更简单的方法:
static async Task<T> TakeAsync<T>(
IProducerConsumerCollection<T> collection,
CancellationToken token
)
{
T result;
while(!collection.TryTake(out result))
{
await Task.Yield();
token.ThrowIfCancellationRequested();
}
return result;
}
This will hang indefinitely as the BlockingCollection(T) will not notice the new items. 这将无限期地挂起,因为BlockingCollection(T)将不会注意到新项。
Indeed - because you're adding directly to queue
. 确实如此-因为您是直接添加到queue
。 From the documentation: 从文档中:
Do not modify the underlying collection directly. 不要直接修改基础集合。 Use the
BlockingCollection<T>
methods to add or remove elements. 使用BlockingCollection<T>
方法添加或删除元素。 TheBlockingCollection<T>
object can become corrupted if you change the underlying collection directly. 如果直接更改基础集合,则BlockingCollection<T>
对象可能会损坏。
So your calls to queue.Enqueue
should use blockingCollection
instead. 因此,您对queue.Enqueue
的调用应改用blockingCollection
。
In terms of your TaskAsync
- you can use TryTake
with a timeout of Infinite
(-1) instead... but you might want to read Stephen Cleary's blog post on a similar topic , too... 在TaskAsync
方面,您可以使用TryTake
并使用Infinite
(-1)超时...但是您可能也想阅读Stephen Cleary关于类似主题的博客文章 ...
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