From 5fe4a39927754ce797aa728ed41d189cab95b058 Mon Sep 17 00:00:00 2001
From: Justin Clarke Casey
Date: Thu, 3 Apr 2008 15:28:50 +0000
Subject: * Adding request time limiting strategy for texture requests, though
this isn't useable yet
---
.../Communications/Limit/RepeatLimitStrategy.cs | 2 +-
.../Communications/Limit/TimeLimitStrategy.cs | 140 +++++++++++++++++++++
2 files changed, 141 insertions(+), 1 deletion(-)
create mode 100755 OpenSim/Framework/Communications/Limit/TimeLimitStrategy.cs
(limited to 'OpenSim/Framework/Communications/Limit')
diff --git a/OpenSim/Framework/Communications/Limit/RepeatLimitStrategy.cs b/OpenSim/Framework/Communications/Limit/RepeatLimitStrategy.cs
index 82122fc..85ff2bd 100644
--- a/OpenSim/Framework/Communications/Limit/RepeatLimitStrategy.cs
+++ b/OpenSim/Framework/Communications/Limit/RepeatLimitStrategy.cs
@@ -80,7 +80,7 @@ namespace OpenSim.Framework.Communications.Limit
///
public bool IsFirstRefusal(TId id)
{
- if (m_maxRequests + 1 == requestCounts[id])
+ if (requestCounts.ContainsKey(id) && m_maxRequests + 1 == requestCounts[id])
{
return true;
}
diff --git a/OpenSim/Framework/Communications/Limit/TimeLimitStrategy.cs b/OpenSim/Framework/Communications/Limit/TimeLimitStrategy.cs
new file mode 100755
index 0000000..b2b4f14
--- /dev/null
+++ b/OpenSim/Framework/Communications/Limit/TimeLimitStrategy.cs
@@ -0,0 +1,140 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * * Neither the name of the OpenSim Project nor the
+ * names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Collections.Generic;
+
+namespace OpenSim.Framework.Communications.Limit
+{
+ ///
+ /// Limit requests by discarding repeat attempts that occur within a given time period
+ ///
+ /// XXX Don't use this for limiting texture downloading, at least not until we better handle multiple requests
+ /// for the same texture at different resolutions.
+ ///
+ public class TimeLimitStrategy : IRequestLimitStrategy
+ {
+ ///
+ /// Record the time at which an asset request occurs.
+ ///
+ private readonly Dictionary requests = new Dictionary();
+
+ ///
+ /// The minimum time period between which requests for the same data will be serviced.
+ ///
+ private readonly TimeSpan m_repeatPeriod;
+ public TimeSpan RepeatPeriod
+ {
+ get { return m_repeatPeriod; }
+ }
+
+ ///
+ ///
+ public TimeLimitStrategy(TimeSpan repeatPeriod)
+ {
+ m_repeatPeriod = repeatPeriod;
+ }
+
+ ///
+ ///
+ ///
+ public bool AllowRequest(TId id)
+ {
+ if (IsMonitoringRequests(id))
+ {
+ DateTime now = DateTime.Now;
+ TimeSpan elapsed = now - requests[id].Time;
+
+ if (elapsed < RepeatPeriod)
+ {
+ requests[id].Refusals += 1;
+ return false;
+ }
+
+ requests[id].Time = now;
+ }
+
+ return true;
+ }
+
+ ///
+ ///
+ ///
+ public bool IsFirstRefusal(TId id)
+ {
+ if (IsMonitoringRequests(id))
+ {
+ if (1 == requests[id].Refusals)
+ {
+ return true;
+ }
+ }
+
+ return false;
+ }
+
+ ///
+ ///
+ ///
+ public void MonitorRequests(TId id)
+ {
+ if (!IsMonitoringRequests(id))
+ {
+ requests.Add(id, new Request(System.DateTime.Now));
+ }
+ }
+
+ ///
+ ///
+ ///
+ public bool IsMonitoringRequests(TId id)
+ {
+ return requests.ContainsKey(id);
+ }
+ }
+
+ ///
+ /// Private request details.
+ ///
+ class Request
+ {
+ ///
+ /// Time of last request
+ ///
+ public DateTime Time;
+
+ ///
+ /// Number of refusals associated with this request
+ ///
+ public int Refusals;
+
+ public Request(DateTime time)
+ {
+ Time = time;
+ }
+ }
+}
--
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