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using System;
using System.IO.MemoryMappedFiles;
using System.Threading;
using Pfz.Caching;
using Pfz.Threading;
namespace Pfz.Remoting
{
/// <summary>
/// Creates a Listener using MemoryMappedFiles (local-only, but very fast).
/// </summary>
public sealed class MmfChannellerListener:
ThreadSafeDisposable,
IChannellerListener
{
private MemoryMappedFile _file;
private MemoryMappedViewAccessor _accessor;
private Mutex _mutex;
private EventWaitHandle _requestEvent;
private EventWaitHandle _resultEvent;
private ManualResetEvent _mreDisposed;
private WaitHandle[] _waitHandles;
/// <summary>
/// Creates a new listener with the given name.
/// </summary>
public MmfChannellerListener(string name)
{
if (name == null)
throw new ArgumentNullException("name");
try
{
bool createdNew;
_mutex = new Mutex(false, "Pfz.Remoting.MmfListener.Mutex:" + name, out createdNew);
if (!createdNew)
throw new RemotingException("The given listener name is already used.");
_requestEvent = new EventWaitHandle(false, EventResetMode.AutoReset, "Pfz.Remoting.MmfListener.RequestEvent:" + name, out createdNew);
if (!createdNew)
throw new RemotingException("The given listener name is already used.");
_resultEvent = new EventWaitHandle(false, EventResetMode.AutoReset, "Pfz.Remoting.MmfListener.ResultEvent:" + name, out createdNew);
if (!createdNew)
throw new RemotingException("The given listener name is already used.");
_file = MemoryMappedFile.CreateNew("Pfz.Remoting.MmfListener.MemoryMappedFile:" + name, sizeof(long));
_accessor = _file.CreateViewAccessor();
_mreDisposed = new ManualResetEvent(false);
_waitHandles= new WaitHandle[2];
_waitHandles[0] = _mreDisposed;
_waitHandles[1] = _requestEvent;
}
catch
{
Dispose();
throw;
}
}
/// <summary>
/// Releases all the resources used by this object.
/// </summary>
protected override void Dispose(bool disposing)
{
if (disposing)
{
var mreDisposed = _mreDisposed;
if (mreDisposed != null)
mreDisposed.Set();
Disposer.Dispose(ref _requestEvent);
Disposer.Dispose(ref _resultEvent);
Disposer.Dispose(ref _mutex);
Disposer.Dispose(ref _accessor);
Disposer.Dispose(ref _file);
}
base.Dispose(disposing);
}
/// <summary>
/// Tries to accept a new channeller.
/// </summary>
/// <returns></returns>
public MmfChanneller TryAccept()
{
CheckUndisposed();
int index = WaitHandle.WaitAny(_waitHandles);
if (index == 0)
{
var mreDisposed = _mreDisposed;
if (mreDisposed != null)
{
_mreDisposed = null;
mreDisposed.Dispose();
}
return null;
}
long newId = TicksOrIncrement.GetNext();
lock(DisposeLock)
{
if (WasDisposed)
{
var mreDisposed = _mreDisposed;
if (mreDisposed != null)
{
_mreDisposed = null;
mreDisposed.Dispose();
}
return null;
}
var result = new MmfChanneller(newId, true);
_accessor.Write(0, newId);
_resultEvent.Set();
return result;
}
}
IChanneller IChannellerListener.TryAccept()
{
return TryAccept();
}
}
}
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I started to program computers when I was 11 years old, as a hobbyist, programming in AMOS Basic and Blitz Basic for Amiga.
At 12 I had my first try with assembler, but it was too difficult at the time. Then, in the same year, I learned C and, after learning C, I was finally able to learn assembler (for Motorola 680x0).
Not sure, but probably between 12 and 13, I started to learn C++. I always programmed "in an object oriented way", but using function pointers instead of virtual methods.
At 15 I started to learn Pascal at school and to use Delphi. At 16 I started my first internship (using Delphi). At 18 I started to work professionally using C++ and since then I've developed my programming skills as a professional developer in C++ and C#, generally creating libraries that help other developers do their work easier, faster and with less errors.
Want more info or simply want to contact me?
Take a look at:
http://paulozemek.azurewebsites.net/
Or e-mail me at: paulozemek@outlook.com
Codeproject MVP 2012, 2015 & 2016
Microsoft MVP 2013-2014 (in October 2014 I started working at Microsoft, so I can't be a Microsoft MVP anymore).