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using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.Contracts;
using System.Management.Automation;
using System.Management.Automation.Host;
using System.Management.Automation.Runspaces;
using System.Threading;
namespace PSParallel
{
sealed class PowershellPool : IDisposable
{
private readonly object _countLock = new object();
private int _busyCount;
private readonly CancellationToken _cancellationToken;
private readonly List<PowerShellPoolMember> _poolMembers;
private readonly InitialSessionState _initialSessionState;
private readonly BlockingCollection<PowerShellPoolMember> _availablePoolMembers = new BlockingCollection<PowerShellPoolMember>(new ConcurrentQueue<PowerShellPoolMember>());
public readonly PowerShellPoolStreams Streams = new PowerShellPoolStreams();
private int _processedCount;
public PowershellPool(int poolSize, InitialSessionState initialSessionState, CancellationToken cancellationToken)
{
_poolMembers= new List<PowerShellPoolMember>(poolSize);
_initialSessionState = initialSessionState;
_cancellationToken = cancellationToken;
for (var i = 0; i < poolSize; i++)
{
var powerShellPoolMember = new PowerShellPoolMember(this, i+1, initialSessionState);
_poolMembers.Add(powerShellPoolMember);
_availablePoolMembers.Add(powerShellPoolMember);
}
}
private int GetPartiallyProcessedCount()
{
var totalPercentComplete = 0;
var count = _poolMembers.Count;
for (int i = 0; i < count; ++i)
{
var percentComplete = _poolMembers[i].PercentComplete;
if (percentComplete < 0)
{
percentComplete = 0;
}
else if(percentComplete > 100)
{
percentComplete = 100;
}
totalPercentComplete += percentComplete;
}
var partiallyProcessedCount = totalPercentComplete / 100;
return partiallyProcessedCount;
}
public int GetEstimatedProgressCount()
{
lock(_countLock) {
return _processedCount + GetPartiallyProcessedCount();
}
}
public bool TryAddInput(ScriptBlock scriptblock,PSObject inputObject)
{
PowerShellPoolMember poolMember;
if(!TryWaitForAvailablePowershell(100, out poolMember))
{
return false;
}
Interlocked.Increment(ref _busyCount);
poolMember.BeginInvoke(scriptblock, inputObject);
return true;
}
public bool WaitForAllPowershellCompleted(int timeoutMilliseconds)
{
Contract.Requires(timeoutMilliseconds >= 0);
var startTicks = Environment.TickCount;
var currendTicks = startTicks;
while (currendTicks - startTicks < timeoutMilliseconds)
{
currendTicks = Environment.TickCount;
if (_cancellationToken.IsCancellationRequested)
{
return false;
}
if (Interlocked.CompareExchange(ref _busyCount, 0, 0) == 0)
{
return true;
}
Thread.Sleep(10);
}
return false;
}
private bool TryWaitForAvailablePowershell(int milliseconds, out PowerShellPoolMember poolMember)
{
if (!_availablePoolMembers.TryTake(out poolMember, milliseconds, _cancellationToken))
{
_cancellationToken.ThrowIfCancellationRequested();
Debug.WriteLine("WaitForAvailablePowershell - TryTake failed");
poolMember = null;
return false;
}
return true;
}
public void Dispose()
{
Streams.Dispose();
_availablePoolMembers.Dispose();
}
public void ReportAvailable(PowerShellPoolMember poolmember)
{
Interlocked.Decrement(ref _busyCount);
lock (_countLock)
{
_processedCount++;
poolmember.PercentComplete = 0;
}
poolmember.PercentComplete = 0;
while (!_availablePoolMembers.TryAdd(poolmember, 1000, _cancellationToken))
{
_cancellationToken.ThrowIfCancellationRequested();
Debug.WriteLine("WaitForAvailablePowershell - TryAdd failed");
}
}
public void ReportStopped(PowerShellPoolMember powerShellPoolMember)
{
Interlocked.Decrement(ref _busyCount);
}
public void Stop()
{
_availablePoolMembers.CompleteAdding();
foreach (var poolMember in _poolMembers)
{
poolMember.Stop();
}
WaitForAllPowershellCompleted(5000);
}
}
}