|
using System;
using System.IO;
namespace Pfz.Remoting
{
/// <summary>
/// This class represents a communication stream that uses MemoryMappedFiles as its sharing resource.
/// It is bidirectional
/// </summary>
public class MemoryMappedFileStream:
Stream
{
private MemoryMappedFileWriter _writer;
private MemoryMappedFileReader _reader;
private MemoryMappedFileStream()
{
}
/// <summary>
/// Creates a new memory-mapped-file communication, as the server.
/// </summary>
public static MemoryMappedFileStream CreateAsServer(string name, int length, int timeout=-1)
{
MemoryMappedFileStream result = new MemoryMappedFileStream();
result.Name="Mmf:" + name;
result._writer = new MemoryMappedFileWriter(name + ":2", length, timeout);
try
{
result._reader = new MemoryMappedFileReader(name + ":1", timeout);
}
catch
{
result.Dispose();
throw;
}
return result;
}
/// <summary>
/// Creates a new memory-mapped-file communication, as the client.
/// </summary>
public static MemoryMappedFileStream CreateAsClient(string name, int timeout=-1)
{
MemoryMappedFileStream result = new MemoryMappedFileStream();
result.Name = "Mmf:" + name;
var reader = new MemoryMappedFileReader(name + ":2", timeout);
try
{
result._reader = reader;
result._writer = new MemoryMappedFileWriter(name + ":1", reader.MemoryMappedFileLength, timeout);
}
catch
{
result.Dispose();
throw;
}
return result;
}
/// <summary>
/// Releases the reader and writer.
/// </summary>
protected override void Dispose(bool disposing)
{
if (disposing)
{
Disposer.Dispose(ref _writer);
Disposer.Dispose(ref _reader);
}
base.Dispose(disposing);
}
/// <summary>
/// Always returns true.
/// </summary>
public override bool CanTimeout
{
get
{
return true;
}
}
/// <summary>
/// Gets the Name of this MemoryMappedFileStream.
/// </summary>
public string Name
{
get; private set;
}
/// <summary>
/// Gets or sets the read-timeout.
/// </summary>
public override int ReadTimeout
{
get
{
return _reader.Timeout;
}
set
{
_reader.Timeout = value;
}
}
/// <summary>
/// Gets or sets the write-timeout.
/// </summary>
public override int WriteTimeout
{
get
{
return _writer.Timeout;
}
set
{
_writer.Timeout = value;
}
}
/// <summary>
/// Always returns true.
/// </summary>
public override bool CanRead
{
get
{
return true;
}
}
/// <summary>
/// Always returns false.
/// </summary>
public override bool CanSeek
{
get
{
return false;
}
}
/// <summary>
/// Always returns true.
/// </summary>
public override bool CanWrite
{
get
{
return true;
}
}
/// <summary>
/// Tells the other side that it can start reading.
/// </summary>
public override void Flush()
{
_writer.Flush();
}
/// <summary>
/// Not supported.
/// </summary>
public override long Length
{
get { throw new NotSupportedException(); }
}
/// <summary>
/// Not supported.
/// </summary>
public override long Position
{
get
{
throw new NotSupportedException();
}
set
{
throw new NotSupportedException();
}
}
/// <summary>
/// Reads data to the given buffer.
/// </summary>
public override int Read(byte[] buffer, int offset, int count)
{
return _reader.Read(buffer, offset, count);
}
/// <summary>
/// Not supported.
/// </summary>
public override long Seek(long offset, SeekOrigin origin)
{
throw new NotSupportedException();
}
/// <summary>
/// Not supported.
/// </summary>
public override void SetLength(long value)
{
throw new NotSupportedException();
}
/// <summary>
/// Writes the buffer data to the stream.
/// </summary>
public override void Write(byte[] buffer, int offset, int count)
{
_writer.Write(buffer, offset, count);
}
/// <summary>
/// Reads a single byte of data. Returns -1 if connection is lost.
/// </summary>
public override int ReadByte()
{
return _reader.ReadByte();
}
/// <summary>
/// Writes a single byte of data.
/// </summary>
public override void WriteByte(byte value)
{
_writer.WriteByte(value);
}
}
}
|
By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.
If a file you wish to view isn't highlighted, and is a text file (not binary), please
let us know and we'll add colourisation support for it.
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).