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StagedParallelProcessor.cs
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StagedParallelProcessor.cs
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using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace SharedTools
{
public class StagedParallelProcessor<T>
{
private readonly BlockingCollection<T> _queue = new BlockingCollection<T>();
private readonly Thread[] _threads;
private readonly Action<T> _itemProcessor;
private int _leftItemCount = 0;
private readonly AutoResetEvent _areStageFinished = new AutoResetEvent(false);
private readonly Dictionary<T, Exception> _errors = new Dictionary<T, Exception>();
public Dictionary<T, Exception> Exceptions
{
get
{
lock (_errors)
{
return new Dictionary<T, Exception>(_errors);
}
}
}
public bool Success
{
get
{
lock (_errors)
{
return _errors.Count == 0;
}
}
}
private void DatenThread(object source)
{
foreach (T item in (IEnumerable<T>)source)
{
try
{
_itemProcessor(item);
}
catch (Exception ex)
{
lock (_errors)
{
_errors.Add(item, ex);
}
}
finally
{
if (Interlocked.Decrement(ref _leftItemCount) == 0)
{
_areStageFinished.Set();
}
}
}
}
public StagedParallelProcessor(Action<T> itemProcessor, int degreeOfParallelism)
{
if (degreeOfParallelism < 1) throw new ArgumentOutOfRangeException(nameof(degreeOfParallelism));
_threads = new Thread[degreeOfParallelism];
_itemProcessor = itemProcessor;
Thread t;
for (int x = 0; x < degreeOfParallelism; ++x)
{
t = new Thread(DatenThread);
t.IsBackground = true;
t.Start(_queue.GetConsumingEnumerable());
_threads[x] = t;
}
}
public StagedParallelProcessor(Action<T> itemProcessor) : this(itemProcessor, Environment.ProcessorCount)
{
}
public void Add(T item)
{
_areStageFinished.Reset();
Interlocked.Increment(ref _leftItemCount);
_queue.Add(item);
}
public void AddRange(IEnumerable<T> source)
{
_areStageFinished.Reset();
if (source is ICollection<T> coll)
{
Interlocked.Add(ref _leftItemCount, coll.Count);
foreach (T item in source) _queue.Add(item);
}
else
{
foreach (T item in source)
{
Interlocked.Increment(ref _leftItemCount);
_queue.Add(item);
}
}
}
public void JoinStage()
{
_areStageFinished.WaitOne();
}
public Task JoinStageAsync()
{
return AsyncExtensions.WaitOneAsync(_areStageFinished);
}
public void Complete()
{
_queue.CompleteAdding();
foreach (Thread t in _threads) t.Join();
}
public Task CompleteAsync()
{
TaskCompletionSource<bool> tcs = new TaskCompletionSource<bool>();
Thread t = new Thread(_tcs =>
{
Complete();
((TaskCompletionSource<bool>)_tcs).SetResult(true);
});
t.IsBackground = true;
t.Start(tcs);
return tcs.Task;
}
}
}