1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
//
// DependencyInjector.cs
//
// Author:
// Martin Baulig <mabaul@microsoft.com>
//
// Copyright (c) 2018 Xamarin, Inc.
//
// 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.
using System;
using System.Reflection;
using System.Runtime.CompilerServices;
namespace Mono
{
static class DependencyInjector
{
/*
* Allows us to use code from `System.dll` in `mscorlib.dll`.
*
*/
internal static ISystemDependencyProvider SystemProvider {
get {
if (systemDependency != null)
return systemDependency;
lock (locker) {
if (systemDependency != null)
return systemDependency;
systemDependency = ReflectionLoad ();
if (systemDependency == null)
throw new PlatformNotSupportedException ($"Cannot find '{TypeName}' dependency");
return systemDependency;
}
}
}
internal static void Register (ISystemDependencyProvider provider)
{
lock (locker) {
if (systemDependency != null && systemDependency != provider)
throw new InvalidOperationException ();
systemDependency = provider;
}
}
const string TypeName = "Mono.SystemDependencyProvider, System";
[PreserveDependency ("get_Instance()", "Mono.SystemDependencyProvider", "System")]
static ISystemDependencyProvider ReflectionLoad ()
{
var type = Type.GetType (TypeName);
if (type == null)
return null;
var prop = type.GetProperty ("Instance", BindingFlags.Static | BindingFlags.Public | BindingFlags.DeclaredOnly);
if (prop == null)
return null;
return (ISystemDependencyProvider) prop.GetValue (null);
}
static object locker = new object ();
static ISystemDependencyProvider systemDependency;
}
}
|
