C# 使用IEnumerable源进行分区
我有类型为IProducerConsumerCollection的ConcurrentQueue,即C# 使用IEnumerable源进行分区,c#,async-await,task-parallel-library,producer-consumer,C#,Async Await,Task Parallel Library,Producer Consumer,我有类型为IProducerConsumerCollection的ConcurrentQueue,即 IProducerConsumerCollection<Job> _queue = new ConcurrentQueue<Job>(); IProducerConsumerCollection\u queue=new ConcurrentQueue(); 生产者方法将作业添加到_队列,消费者方法处理来自_队列的作业。现在在consumer方法中,我喜欢同时处理作业。
IProducerConsumerCollection<Job> _queue = new ConcurrentQueue<Job>();
IProducerConsumerCollection\u queue=new ConcurrentQueue();
生产者方法将作业添加到_队列,消费者方法处理来自_队列的作业。现在在consumer方法中,我喜欢同时处理作业。下面是带有生产者和消费者方法的示例类的代码:
public class TestQueue
{
IProducerConsumerCollection<Job> _queue = new ConcurrentQueue<Job>();
private static HttpClient _client = new HttpClient();
public TestQueue()
{
WorkProducerThread();
WorkConsumerThread();
}
public void WorkConsumerThread()
{
if (_queue.Count > 0)
{
//At this point, 4 partitions are created but all records are in 1st partition only; 2,3,4 partition are empty
var partitioner = Partitioner.Create(_queue).GetPartitions(4);
Task t = Task.WhenAll(
from partition in partitioner
select Task.Run(async () =>
{
using (partition)
{
while (partition.MoveNext())
await CreateJobs(partition.Current);
}
}));
t.Wait();
//At this point, queue count is still 20, how to remove item from _queue collection when processed?
}
}
private async Task CreateJobs(Job job)
{
HttpContent bodyContent = null;
await _client.PostAsync("job", bodyContent);
}
public void WorkProducerThread()
{
if (_queue.Count == 0)
{
try
{
for (int i = 0; i < 20; i++)
{
Job job = new Job { Id = i, JobName = "j" + i.ToString(), JobCreated = DateTime.Now };
_queue.TryAdd(job);
}
}
catch (Exception ex)
{
//_Log.Error("Exception while adding jobs to collection", ex);
}
}
}
}
public class Job
{
public int Id { get; set; }
public string JobName { get; set; }
public DateTime JobCreated { get; set; }
}
公共类测试队列
{
IProducerConsumerCollection_queue=new ConcurrentQueue();
私有静态HttpClient _client=new HttpClient();
公共测试队列()
{
WorkProducerThread();
WorkConsumerThread();
}
public void WorkConsumerThread()
{
如果(_queue.Count>0)
{
//此时,创建了4个分区,但所有记录仅在第1个分区中;2、3、4个分区为空
var partitioner=partitioner.Create(_queue).GetPartitions(4);
Task t=Task.WhenAll(
从分区器中的分区
选择Task.Run(异步()=>
{
使用(分区)
{
while(partition.MoveNext())
等待CreateJobs(partition.Current);
}
}));
t、 等待();
//此时,队列计数仍为20,如何在处理时从队列集合中删除项目?
}
}
专用异步任务CreateJobs(作业作业)
{
HttpContent bodyContent=null;
等待_client.PostAsync(“作业”,bodyContent);
}
public void WorkProducerThread()
{
如果(_queue.Count==0)
{
尝试
{
对于(int i=0;i<20;i++)
{
Job Job=new Job{Id=i,JobName=“j”+i.ToString(),JobCreated=DateTime.Now};
_queue.TryAdd(作业);
}
}
捕获(例外情况除外)
{
//_Log.Error(“将作业添加到集合时出现异常”,例如);
}
}
}
}
公开课工作
{
公共int Id{get;set;}
公共字符串JobName{get;set;}
已创建公共日期时间作业{get;set;}
}
有两个问题,
Partitioner.Create(_queue).GetPartitions(4);GetPartitions创建4个分区,但所有记录仅在第一个分区中;2、3、4分区为空。我找不到,为什么会这样?理想情况下,所有4个分区每个都应该有5条记录(因为队列中总共有20条记录)。我读了MSDN关于分区的文章,但并没有得到任何线索。我还检查了文章中的分区示例
Task t = Task.WhenAll(
from partition in partitioner.Select((jobs, i) => new { jobs, i })
select Task.Run(async () =>
{
using (partition.jobs)
{
while (partition.jobs.MoveNext())
{
Console.WriteLine(partition.i);
await CreateJobs(partition.jobs.Current);
}
}
}));
您会注意到,控制台.WriteLine
会将值从0
写入3
——表明它们被正确分区
另外,我想在中处理后从_队列中删除该项目
消费者方法,只有一种方法_queue.TryTake方法
删除项目。我不知道如何删除项目和分区
您只需稍加重写即可实现这一点。主要的变化是切换到BlockingCollection
,并通过添加来访问GetConsumingPartitioner
尝试一下:
using System;
using System.Collections.Concurrent;
using System.Linq;
using System.Net.Http;
using System.Threading.Tasks;
namespace Test
{
public class TestQueue
{
BlockingCollection<Job> _queue = new BlockingCollection<Job>();
private static HttpClient _client = new HttpClient();
public TestQueue()
{
WorkProducerThread();
WorkConsumerThread();
}
public void WorkConsumerThread()
{
if (!_queue.IsCompleted)
{
//At this point, 4 partitions are created but all records are in 1st partition only; 2,3,4 partition are empty
var partitioner = _queue.GetConsumingPartitioner().GetPartitions(4);
Task t = Task.WhenAll(
from partition in partitioner
select Task.Run(async () =>
{
using (partition)
{
while (partition.MoveNext())
await CreateJobs(partition.Current);
}
}));
t.Wait();
Console.WriteLine(_queue.Count);
}
}
private async Task CreateJobs(Job job)
{
//HttpContent bodyContent = null;
//await _client.PostAsync("job", bodyContent);
await Task.Delay(100);
}
public void WorkProducerThread()
{
if (_queue.Count == 0)
{
try
{
for (int i = 0; i < 20; i++)
{
Job job = new Job { Id = i, JobName = "j" + i.ToString(), JobCreated = DateTime.Now };
_queue.TryAdd(job);
}
_queue.CompleteAdding();
}
catch (Exception ex)
{
//_Log.Error("Exception while adding jobs to collection", ex);
}
}
}
}
public class Job
{
public int Id { get; set; }
public string JobName { get; set; }
public DateTime JobCreated { get; set; }
}
class Program
{
static void Main(string[] args)
{
var g = new TestQueue();
Console.ReadLine();
}
}
}
使用系统;
使用System.Collections.Concurrent;
使用System.Linq;
使用System.Net.Http;
使用System.Threading.Tasks;
名称空间测试
{
公共类测试队列
{
BlockingCollection_queue=新建BlockingCollection();
私有静态HttpClient _client=new HttpClient();
公共测试队列()
{
WorkProducerThread();
WorkConsumerThread();
}
public void WorkConsumerThread()
{
如果(!\u queue.IsCompleted)
{
//此时,创建了4个分区,但所有记录仅在第1个分区中;2、3、4个分区为空
var partitioner=\u queue.GetConsumingPartitioner().GetPartitions(4);
Task t=Task.WhenAll(
从分区器中的分区
选择Task.Run(异步()=>
{
使用(分区)
{
while(partition.MoveNext())
等待CreateJobs(partition.Current);
}
}));
t、 等待();
Console.WriteLine(_queue.Count);
}
}
专用异步任务CreateJobs(作业作业)
{
//HttpContent bodyContent=null;
//等待_client.PostAsync(“作业”,bodyContent);
等待任务。延迟(100);
}
public void WorkProducerThread()
{
如果(_queue.Count==0)
{
尝试
{
对于(int i=0;i<20;i++)
{
Job Job=new Job{Id=i,JobName=“j”+i.ToString(),JobCreated=DateTime.Now};
_queue.TryAdd(作业);
}
_queue.CompleteAdding();
}
捕获(例外情况除外)
{
//_Log.Error(“将作业添加到集合时出现异常”,例如);
}