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