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/*
* 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
{
/// <summary>
/// Limit requests by discarding them after they've been repeated a certain number of times.
/// </summary>
public class RepeatLimitStrategy<TId> : IRequestLimitStrategy<TId>
{
/// <summary>
/// Record each asset request that we're notified about.
/// </summary>
private readonly Dictionary<TId, int> requestCounts = new Dictionary<TId, int>();
/// <summary>
/// The maximum number of requests that can be made before we drop subsequent requests.
/// </summary>
private readonly int m_maxRequests;
public int MaxRequests
{
get { return m_maxRequests; }
}
/// <summary></summary>
/// <param name="maxRequests">The maximum number of requests that may be served before all further
/// requests are dropped.</param>
public RepeatLimitStrategy(int maxRequests)
{
m_maxRequests = maxRequests;
}
/// <summary>
/// <see cref="IRequestLimitStrategy"/>
/// </summary>
public bool AllowRequest(TId id)
{
if (requestCounts.ContainsKey(id))
{
requestCounts[id] += 1;
if (requestCounts[id] > m_maxRequests)
{
return false;
}
}
return true;
}
/// <summary>
/// <see cref="IRequestLimitStrategy"/>
/// </summary>
public bool IsFirstRefusal(TId id)
{
if (m_maxRequests + 1 == requestCounts[id])
{
return true;
}
return false;
}
/// <summary>
/// <see cref="IRequestLimitStrategy"/>
/// </summary>
public void MonitorRequests(TId id)
{
if (!IsMonitoringRequests(id))
{
requestCounts.Add(id, 1);
}
}
/// <summary>
/// <see cref="IRequestLimitStrategy"/>
/// </summary>
public bool IsMonitoringRequests(TId id)
{
return requestCounts.ContainsKey(id);
}
}
}
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