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| using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Threading;
namespace MapnikWrapperTester
{
/// <summary>
/// process pool Class
/// </summary>
public class Pool_process
{
// Size of the pool, defines how many processes will be started
private const int POOL_SIZE = 5;
// singelton
private static Pool_process _unique;
// list of instanciated process
private List<Couple> processList;
// number to iterate images
private uint _tileNum;
// tell if the class is being disposed
private bool _isDisposing;
// constructor
private Pool_process()
{
processList = new List<Couple>();
for (int i = 0; i < POOL_SIZE; i++)
{
// loads as many process as needed
processList.Add(new Couple(newProcess(true)));
}
_tileNum = 0;
_isDisposing = false;
}
/// <summary>
/// pick a free process and execute the command
/// </summary>
/// <param name="args">command aruments</param>
/// <returns>result of process</returns>
public Image execute(string args)
{
Couple cp = getFreeProc(); // try to pick a process from the pool
Image img;
// image path
string map_res_path = @"C:\temp\map_out\map" + _tileNum++ + ".png";
// get a free proc
if (cp != null)
{
Process proc = cp.Proc;
cp.AutoEvent = new AutoResetEvent(false);
proc.StandardInput.WriteLine(args + " -O \"" + map_res_path + "\" go");
// wait for the map has been done (see Pool_Process.on_proc_output(...) )
cp.AutoEvent.WaitOne();
proc.StandardInput.WriteLine("1"); // don't stop the process;
}
else // if no free Process available, creates a new one
{
Console.WriteLine("Pool is fully used, creating a new process");
Process proc = newProcess(false);
proc.StandardInput.WriteLine(args + " -O \"" + map_res_path + "\" go 0"); // add "0" to tell the process to exit
proc.WaitForExit();
proc.Close();
}
// map is done
img = Image.FromFile(map_res_path);
return img;
}
// get a free process in the list. returns null if all processes in use
[MethodImpl(MethodImplOptions.Synchronized)]
private Couple getFreeProc()
{
for(int i=0 ; i<processList.Count ; i++)
if (processList[i].IsUsed == false)
{
processList[i].IsUsed = true;
return processList[i];
}
return null;
}
/// <summary>
/// get unique instance of the Class
/// </summary>
/// <returns>Pool_process</returns>
public static Pool_process getInstance()
{
if (_unique == null)
_unique = new Pool_process();
return _unique;
}
// triggered when process in pool is exiting
private void on_proc_Exit(Object sender, EventArgs e)
{
if (sender is Process)
{
if (((Process)sender).ExitCode < 0 && _isDisposing == false)
{
for (int i = 0; i < processList.Count; i++)
if (processList[i].Proc == (Process)sender)
processList[i].Proc = newProcess(true);
throw new SystemException("Un processus a échoué. code : " + ((Process)sender).ExitCode + "(" + ((Process)sender).StandardError.ReadToEnd() + ")");
}
}
}
// triggered when process writes on stdout.
private void on_proc_output(object sender, DataReceivedEventArgs e)
{
if (!String.IsNullOrEmpty(e.Data))
{
if(e.Data == "[end]")
{
foreach(Couple c in processList)
{
if(c.Proc == (Process)sender)
{
// resumes calling thread
c.AutoEvent.Set();
// release process
c.IsUsed = false;
}
}
}
}
}
// creates a new process and start it. Process will then be idling for input.
private Process newProcess(bool is_pool)
{
Process proc = new Process();
// hide window
proc.StartInfo.UseShellExecute = false;
//proc.StartInfo.CreateNoWindow = true;
//proc.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
proc.StartInfo.RedirectStandardOutput = true;
proc.StartInfo.RedirectStandardError = true;
proc.StartInfo.RedirectStandardInput = true;
proc.StartInfo.StandardOutputEncoding = System.Text.Encoding.UTF7;
//proc.StartInfo.WorkingDirectory = GlobalDatas.Configuration.Path["map_builder"];
//proc.StartInfo.FileName = GlobalDatas.Configuration.Path["map_builder"] + "Map Builder.exe";
proc.StartInfo.WorkingDirectory = @"C:\Work\VStudio\Map Builder\release";
proc.StartInfo.FileName = @"C:\Work\VStudio\Map Builder\release\Map Builder.exe";
if(is_pool)
proc.Exited += new EventHandler(on_proc_Exit);
proc.OutputDataReceived += new DataReceivedEventHandler(on_proc_output);
proc.EnableRaisingEvents = true;
proc.Start();
proc.BeginOutputReadLine();
return proc;
}
// disposing the calss, kill the processes.
public void Dispose()
{
_isDisposing = true;
foreach (Couple c in processList)
{
c.Proc.Kill();
c.Proc.Close();
}
Console.WriteLine("all process killed");
}
/// <summary>
/// Util class to handle process and their status
/// </summary>
private class Couple
{
private Process _proc;
private bool _isUsed;
private AutoResetEvent _autoEvent;
public Couple(Process p)
{
_proc = p;
_isUsed = false;
}
public Process Proc
{
get { return _proc; }
set { _proc = value; }
}
public bool IsUsed
{
get { return _isUsed; }
set { _isUsed = value; }
}
public AutoResetEvent AutoEvent
{
get { return _autoEvent; }
set { _autoEvent = value; }
}
}
}
} |
Creation d'un Pool de process[Débutant]
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