BindingFlags.Public needed here as Exception.HResult is now public in .NET 4.5. This...
[mono.git] / mcs / class / System / System.Runtime.InteropServices / HandleCollector.cs
1 //
2 // HandleCollector.cs
3 //
4 // Author: Atsushi Enomoto  <atsushi@ximian.com>
5 //
6 // Copyright (C) 2007 Novell, Inc (http://www.novell.com)
7 //
8 // Permission is hereby granted, free of charge, to any person obtaining
9 // a copy of this software and associated documentation files (the
10 // "Software"), to deal in the Software without restriction, including
11 // without limitation the rights to use, copy, modify, merge, publish,
12 // distribute, sublicense, and/or sell copies of the Software, and to
13 // permit persons to whom the Software is furnished to do so, subject to
14 // the following conditions:
15 // 
16 // The above copyright notice and this permission notice shall be
17 // included in all copies or substantial portions of the Software.
18 // 
19 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
20 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
22 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
23 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
24 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
25 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 //
27
28 #if NET_2_0
29
30 using System;
31
32 namespace System.Runtime.InteropServices
33 {
34         public sealed class HandleCollector
35         {
36                 int count;
37                 readonly int init, max;
38                 readonly string name;
39                 DateTime previous_collection = DateTime.MinValue;
40
41                 public HandleCollector (string name, int initialThreshold)
42                         : this (name, initialThreshold, int.MaxValue)
43                 {
44                 }
45
46                 public HandleCollector (string name, int initialThreshold, int maximumThreshold)
47                 {
48                         if (initialThreshold < 0)
49                                 throw new ArgumentOutOfRangeException ("initialThreshold", "initialThreshold must not be less than zero");
50                         if (maximumThreshold < 0)
51                                 throw new ArgumentOutOfRangeException ("maximumThreshold", "maximumThreshold must not be less than zero");
52                         if (maximumThreshold < initialThreshold)
53                                 throw new ArgumentException ("maximumThreshold must not be less than initialThreshold");
54
55                         this.name = name;
56                         init = initialThreshold;
57                         max = maximumThreshold;
58                 }
59
60                 public int Count {
61                         get { return count; }
62                 }
63
64                 public int InitialThreshold {
65                         get { return init; }
66                 }
67
68                 public int MaximumThreshold {
69                         get { return max; }
70                 }
71
72                 public string Name {
73                         get { return name; }
74                 }
75
76                 public void Add ()
77                 {
78 /* NET_3_5
79                         if (++count >= max)
80                                 GC.Collect (GC.MaxGeneration, GCCollectionMode.Forced);
81                         else if (count >= init)
82                                 GC.Collect (GC.MaxGeneration, GCCollectionMode.Optimized);
83 */
84                         if (++count >= max)
85                                 GC.Collect (GC.MaxGeneration);
86                         else if (count >= init && DateTime.Now - previous_collection > TimeSpan.FromSeconds (5)) { // some arbitrary criteria
87                                 GC.Collect (GC.MaxGeneration);
88                                 previous_collection = DateTime.Now;
89                         }
90                 }
91
92                 public void Remove ()
93                 {
94                         if (count == 0)
95                                 throw new InvalidOperationException ("Cannot call Remove method when Count is 0");
96                         count--;
97                 }
98         }
99 }
100
101 #endif