86 lines
2.6 KiB
C#
86 lines
2.6 KiB
C#
//
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// DependencyInjector.cs
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//
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// Author:
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// Martin Baulig <mabaul@microsoft.com>
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//
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// Copyright (c) 2018 Xamarin, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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using System;
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using System.Reflection;
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using System.Runtime.CompilerServices;
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namespace Mono
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{
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static class DependencyInjector
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{
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/*
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* Allows us to use code from `System.dll` in `mscorlib.dll`.
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*
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*/
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internal static ISystemDependencyProvider SystemProvider {
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get {
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if (systemDependency != null)
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return systemDependency;
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lock (locker) {
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if (systemDependency != null)
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return systemDependency;
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systemDependency = ReflectionLoad ();
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if (systemDependency == null)
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throw new PlatformNotSupportedException ($"Cannot find '{TypeName}' dependency");
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return systemDependency;
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}
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}
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}
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internal static void Register (ISystemDependencyProvider provider)
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{
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lock (locker) {
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if (systemDependency != null && systemDependency != provider)
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throw new InvalidOperationException ();
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systemDependency = provider;
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}
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}
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const string TypeName = "Mono.SystemDependencyProvider, System";
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[PreserveDependency ("get_Instance()", "Mono.SystemDependencyProvider", "System")]
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static ISystemDependencyProvider ReflectionLoad ()
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{
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var type = Type.GetType (TypeName);
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if (type == null)
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return null;
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var prop = type.GetProperty ("Instance", BindingFlags.Static | BindingFlags.Public | BindingFlags.DeclaredOnly);
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if (prop == null)
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return null;
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return (ISystemDependencyProvider) prop.GetValue (null);
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}
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static object locker = new object ();
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static ISystemDependencyProvider systemDependency;
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}
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}
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