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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 OpenSimulator 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;
using System.Net;
using OpenSim.Framework;
using OpenMetaverse;
using BclExtras.Collections;
using ReaderWriterLockImpl = OpenMetaverse.ReaderWriterLockSlim;
namespace OpenSim.Region.ClientStack.LindenUDP
{
/// <summary>
/// A thread safe mapping from endpoints to client references
/// </summary>
public sealed class UDPClientCollection
{
#region IComparers
private sealed class IPEndPointComparer : IComparer<IPEndPoint>
{
public int Compare(IPEndPoint x, IPEndPoint y)
{
int result = x.Address.Address.CompareTo(y.Address.Address);
if (result == 0) result = x.Port.CompareTo(y.Port);
return result;
}
}
#endregion IComparers
/// <summary>An immutable dictionary mapping from <seealso cref="IPEndPoint"/>
/// to <seealso cref="LLUDPClient"/> references</summary>
private ImmutableMap<IPEndPoint, LLUDPClient> m_dict;
/// <summary>Immutability grants thread safety for concurrent reads and
/// read-writes, but not concurrent writes</summary>
private object m_writeLock = new object();
/// <summary>Number of clients in the collection</summary>
public int Count { get { return m_dict.Count; } }
/// <summary>
/// Default constructor
/// </summary>
public UDPClientCollection()
{
m_dict = new ImmutableMap<IPEndPoint, LLUDPClient>(new IPEndPointComparer());
}
/// <summary>
/// Add a client reference to the collection
/// </summary>
/// <param name="key">Remote endpoint of the client</param>
/// <param name="value">Reference to the client object</param>
public void Add(IPEndPoint key, LLUDPClient value)
{
lock (m_writeLock)
m_dict = m_dict.Add(key, value);
}
/// <summary>
/// Remove a client from the collection
/// </summary>
/// <param name="key">Remote endpoint of the client</param>
public void Remove(IPEndPoint key)
{
lock (m_writeLock)
m_dict = m_dict.Delete(key);
}
/// <summary>
/// Resets the client collection
/// </summary>
public void Clear()
{
lock (m_writeLock)
m_dict = new ImmutableMap<IPEndPoint, LLUDPClient>(new IPEndPointComparer());
}
/// <summary>
/// Checks if an endpoint is in the collection
/// </summary>
/// <param name="key">Endpoint to check for</param>
/// <returns>True if the endpoint was found in the collection, otherwise false</returns>
public bool ContainsKey(IPEndPoint key)
{
return m_dict.ContainsKey(key);
}
/// <summary>
/// Attempts to fetch a value out of the collection
/// </summary>
/// <param name="key">Endpoint of the client to retrieve</param>
/// <param name="value">Retrieved client, or null on lookup failure</param>
/// <returns>True if the lookup succeeded, otherwise false</returns>
public bool TryGetValue(IPEndPoint key, out LLUDPClient value)
{
return m_dict.TryGetValue(key, out value);
}
/// <summary>
/// Performs a given task in parallel for each of the elements in the
/// collection
/// </summary>
/// <param name="action">Action to perform on each element</param>
public void ForEach(Action<LLUDPClient> action)
{
Parallel.ForEach<LLUDPClient>(m_dict.Values, action);
}
}
}
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