mirror of
https://github.com/OPCFoundation/UA-.NETStandard.git
synced 2026-10-24 11:01:55 +08:00
141 lines
4.1 KiB
C#
141 lines
4.1 KiB
C#
/* ========================================================================
|
|
* Copyright (c) 2005-2019 The OPC Foundation, Inc. All rights reserved.
|
|
*
|
|
* OPC Foundation MIT License 1.00
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person
|
|
* obtaining a copy of this software and associated documentation
|
|
* files (the "Software"), to deal in the Software without
|
|
* restriction, including without limitation the rights to use,
|
|
* copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following
|
|
* conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
|
|
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
|
|
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
|
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
|
|
* OTHER DEALINGS IN THE SOFTWARE.
|
|
*
|
|
* The complete license agreement can be found here:
|
|
* http://opcfoundation.org/License/MIT/1.00/
|
|
* ======================================================================*/
|
|
|
|
using System;
|
|
using System.Runtime.InteropServices;
|
|
using OpcRcw.Comn;
|
|
|
|
namespace Opc.Ua.Com.Client
|
|
{
|
|
/// <summary>
|
|
/// Manages a connection point with a COM server.
|
|
/// </summary>
|
|
public class ConnectionPoint : IDisposable
|
|
{
|
|
#region Constructors
|
|
/// <summary>
|
|
/// Initializes the object by finding the specified connection point.
|
|
/// </summary>
|
|
public ConnectionPoint(object server, Guid iid)
|
|
{
|
|
OpcRcw.Comn.IConnectionPointContainer cpc = server as OpcRcw.Comn.IConnectionPointContainer;
|
|
|
|
if (cpc == null)
|
|
{
|
|
throw ServiceResultException.Create(StatusCodes.BadCommunicationError, "Server does not support the IConnectionPointContainer interface.");
|
|
}
|
|
|
|
cpc.FindConnectionPoint(ref iid, out m_server);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Sets private members to default values.
|
|
/// </summary>
|
|
private void Initialize()
|
|
{
|
|
m_server = null;
|
|
m_cookie = 0;
|
|
m_refs = 0;
|
|
}
|
|
#endregion
|
|
|
|
#region IDisposable Members
|
|
/// <summary>
|
|
/// The finializer implementation.
|
|
/// </summary>
|
|
~ConnectionPoint()
|
|
{
|
|
Dispose(false);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Frees any unmanaged resources.
|
|
/// </summary>
|
|
public void Dispose()
|
|
{
|
|
Dispose(true);
|
|
GC.SuppressFinalize(this);
|
|
}
|
|
|
|
/// <summary>
|
|
/// An overrideable version of the Dispose.
|
|
/// </summary>
|
|
protected virtual void Dispose(bool disposing)
|
|
{
|
|
object server = System.Threading.Interlocked.Exchange(ref m_server, null);
|
|
|
|
if (server != null)
|
|
{
|
|
ComUtils.ReleaseServer(server);
|
|
}
|
|
}
|
|
#endregion
|
|
|
|
#region Public Properties
|
|
/// <summary>
|
|
/// The cookie returned by the server.
|
|
/// </summary>
|
|
public int Cookie
|
|
{
|
|
get { return m_cookie; }
|
|
}
|
|
#endregion
|
|
|
|
#region IConnectionPoint Members
|
|
/// <summary>
|
|
/// Establishes a connection, if necessary and increments the reference count.
|
|
/// </summary>
|
|
public int Advise(object callback)
|
|
{
|
|
if (m_refs++ == 0)
|
|
{
|
|
m_server.Advise(callback, out m_cookie);
|
|
}
|
|
|
|
return m_refs;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Decrements the reference count and closes the connection if no more references.
|
|
/// </summary>
|
|
public int Unadvise()
|
|
{
|
|
if (--m_refs == 0) m_server.Unadvise(m_cookie);
|
|
return m_refs;
|
|
}
|
|
#endregion
|
|
|
|
#region Private Members
|
|
private OpcRcw.Comn.IConnectionPoint m_server;
|
|
private int m_cookie;
|
|
private int m_refs;
|
|
#endregion
|
|
}
|
|
}
|