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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*============================================================
**
**
** Purpose: part of ComEventHelpers APIs which allow binding
** managed delegates to COM's connection point based events.
**
**/
namespace System.Runtime.InteropServices {
using System;
using ComTypes = System.Runtime.InteropServices.ComTypes;
// see code:ComEventsHelper#ComEventsArchitecture
internal class ComEventsInfo {
#region fields
private ComEventsSink _sinks;
private object _rcw;
#endregion
#region ctor/dtor
ComEventsInfo(object rcw) {
_rcw = rcw;
}
~ComEventsInfo() {
// see code:ComEventsHelper#ComEventsFinalization
_sinks = ComEventsSink.RemoveAll(_sinks);
}
#endregion
#region static methods
internal static ComEventsInfo Find(object rcw) {
return (ComEventsInfo)Marshal.GetComObjectData(rcw, typeof(ComEventsInfo));
}
// it is caller's responsibility to call this method under lock(rcw)
internal static ComEventsInfo FromObject(object rcw) {
ComEventsInfo eventsInfo = Find(rcw);
if (eventsInfo == null) {
eventsInfo = new ComEventsInfo(rcw);
Marshal.SetComObjectData(rcw, typeof(ComEventsInfo), eventsInfo);
}
return eventsInfo;
}
#endregion
#region internal methods
internal ComEventsSink FindSink(ref Guid iid) {
return ComEventsSink.Find(_sinks, ref iid);
}
// it is caller's responsibility to call this method under lock(rcw)
internal ComEventsSink AddSink(ref Guid iid) {
ComEventsSink sink = new ComEventsSink(_rcw, iid);
_sinks = ComEventsSink.Add(_sinks, sink);
return _sinks;
}
// it is caller's responsibility to call this method under lock(rcw)
internal ComEventsSink RemoveSink(ComEventsSink sink) {
_sinks = ComEventsSink.Remove(_sinks, sink);
return _sinks;
}
#endregion
}
}
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