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/*
* Copyright 2019 by its authors. See AUTHORS.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using EventDictionary = System.Collections.Generic.Dictionary<(System.IntPtr desc, object evtDelegate), (System.IntPtr evtCallerPtr, Efl.EventCb evtCaller)>;
namespace Efl
{
namespace Eo
{
/// <summary>Observe the ownership state of an Eo wrapper and control its life-cycle.</summary>
public class WrapperSupervisor
{
private System.WeakReference weakRef;
#pragma warning disable CS0414
private Efl.Eo.IWrapper sharedRef;
#pragma warning restore CS0414
private EventDictionary eoEvents;
/// <summary>Create a new supervisor for the given.</summary>
/// <param name="obj">Efl object to be supervised.</param>
public WrapperSupervisor(Efl.Eo.IWrapper obj)
{
weakRef = new WeakReference(obj);
sharedRef = null;
eoEvents = new EventDictionary();
}
/// <summary>Efl object being supervised.</summary>
public Efl.Eo.IWrapper Target
{
get
{
return (Efl.Eo.IWrapper) weakRef.Target;
}
}
/// <summary>Dictionary that holds the events related with the supervised object.</summary>
public EventDictionary EoEvents
{
get
{
return eoEvents;
}
}
/// <summary>To be called when the object is uniquely owned by C#, removing its strong reference and making it available to garbage collection.</summary>
public void MakeUnique()
{
sharedRef = null;
}
/// <summary>To be called when the object is owned in the native library too, adding a strong reference to it and making it unavailable for garbage collection.</summary>
public void MakeShared()
{
if (this.Target == null)
throw new InvalidOperationException("Tried to make a null reference shared.");
sharedRef = this.Target;
}
}
}
}
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