opensim – Blame information for rev 1

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1 eva 1 /*
2 * Copyright (c) Contributors, http://opensimulator.org/
3 * See CONTRIBUTORS.TXT for a full list of copyright holders.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of the OpenSimulator Project nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27  
28 using System.Collections.Generic;
29  
30 namespace OpenSim.Framework.Communications.Limit
31 {
32 /// <summary>
33 /// Limit requests by discarding them after they've been repeated a certain number of times.
34 /// </summary>
35 public class RepeatLimitStrategy<TId> : IRequestLimitStrategy<TId>
36 {
37 /// <summary>
38 /// Record each asset request that we're notified about.
39 /// </summary>
40 private readonly Dictionary<TId, int> requestCounts = new Dictionary<TId, int>();
41  
42 /// <summary>
43 /// The maximum number of requests that can be made before we drop subsequent requests.
44 /// </summary>
45 private readonly int m_maxRequests;
46 public int MaxRequests
47 {
48 get { return m_maxRequests; }
49 }
50  
51 /// <summary></summary>
52 /// <param name="maxRequests">The maximum number of requests that may be served before all further
53 /// requests are dropped.</param>
54 public RepeatLimitStrategy(int maxRequests)
55 {
56 m_maxRequests = maxRequests;
57 }
58  
59 /// <summary>
60 /// <see cref="IRequestLimitStrategy"/>
61 /// </summary>
62 public bool AllowRequest(TId id)
63 {
64 if (requestCounts.ContainsKey(id))
65 {
66 requestCounts[id] += 1;
67  
68 if (requestCounts[id] > m_maxRequests)
69 {
70 return false;
71 }
72 }
73  
74 return true;
75 }
76  
77 /// <summary>
78 /// <see cref="IRequestLimitStrategy"/>
79 /// </summary>
80 public bool IsFirstRefusal(TId id)
81 {
82 if (requestCounts.ContainsKey(id) && m_maxRequests + 1 == requestCounts[id])
83 {
84 return true;
85 }
86  
87 return false;
88 }
89  
90 /// <summary>
91 /// <see cref="IRequestLimitStrategy"/>
92 /// </summary>
93 public void MonitorRequests(TId id)
94 {
95 if (!IsMonitoringRequests(id))
96 {
97 requestCounts.Add(id, 1);
98 }
99 }
100  
101 /// <summary>
102 /// <see cref="IRequestLimitStrategy"/>
103 /// </summary>
104 public bool IsMonitoringRequests(TId id)
105 {
106 return requestCounts.ContainsKey(id);
107 }
108 }
109 }