#region MIT License
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/**
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* SessionManager.cs
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*
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* The MIT License
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*
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* Copyright (c) 2012 sta.blockhead
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Timers;
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using WebSocketSharp.Frame;
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namespace WebSocketSharp.Server
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{
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public class SessionManager
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{
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#region Private Fields
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private object _forSweep;
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private volatile bool _isStopped;
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private volatile bool _isSweeping;
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private Dictionary<string, WebSocketService> _sessions;
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private Timer _sweepTimer;
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private object _syncRoot;
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#endregion
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#region Public Constructor
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public SessionManager()
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{
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_forSweep = new object();
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_isStopped = false;
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_isSweeping = false;
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_sessions = new Dictionary<string, WebSocketService>();
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_sweepTimer = new Timer(60 * 1000);
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_sweepTimer.Elapsed += (sender, e) =>
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{
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Sweep();
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};
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_syncRoot = new object();
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startSweepTimer();
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}
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#endregion
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#region Properties
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public IEnumerable<string> ActiveID
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{
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get
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{
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var dict = Broadping(String.Empty);
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List<string> keys = new List<string>();
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foreach (var i in dict)
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if (i.Value)
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keys.Add(i.Key);
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return keys;
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}
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}
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public int Count
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{
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get
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{
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lock (_syncRoot)
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{
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return _sessions.Count;
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}
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}
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}
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public IEnumerable<string> InactiveID
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{
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get
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{
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var dict = Broadping(String.Empty);
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List<string> keys = new List<string>();
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foreach (var i in dict)
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if (!i.Value)
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keys.Add(i.Key);
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return keys;
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}
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}
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public IEnumerable<string> ID
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{
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get
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{
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lock (_syncRoot)
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{
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return _sessions.Keys;
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}
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}
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}
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public bool Sweeped
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{
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get
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{
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return _sweepTimer.Enabled;
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}
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set
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{
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if (value && !_isStopped)
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startSweepTimer();
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if (!value)
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stopSweepTimer();
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}
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}
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public object SyncRoot
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{
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get
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{
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return _syncRoot;
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}
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}
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#endregion
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#region Private Methods
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private void broadcast(byte[] data)
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{
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lock (_syncRoot)
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{
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foreach (var service in _sessions.Values)
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service.Send(data);
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}
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}
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private void broadcast(string data)
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{
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lock (_syncRoot)
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{
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foreach (var service in _sessions.Values)
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service.Send(data);
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}
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}
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private void broadcastAsync(byte[] data)
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{
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var sessions = copySessions();
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var services = sessions.Values.GetEnumerator();
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Action completed = null;
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completed = () =>
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{
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if (services.MoveNext())
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services.Current.SendAsync(data, completed);
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};
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if (services.MoveNext())
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services.Current.SendAsync(data, completed);
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}
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private void broadcastAsync(string data)
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{
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var sessions = copySessions();
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var services = sessions.Values.GetEnumerator();
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Action completed = null;
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completed = () =>
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{
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if (services.MoveNext())
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services.Current.SendAsync(data, completed);
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};
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if (services.MoveNext())
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services.Current.SendAsync(data, completed);
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}
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private Dictionary<string, WebSocketService> copySessions()
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{
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lock (_syncRoot)
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{
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return new Dictionary<string, WebSocketService>(_sessions);
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}
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}
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private string createID()
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{
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return Guid.NewGuid().ToString("N");
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}
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private void startSweepTimer()
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{
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if (!Sweeped)
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_sweepTimer.Start();
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}
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private void stopSweepTimer()
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{
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if (Sweeped)
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_sweepTimer.Stop();
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}
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#endregion
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#region Public Methods
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public string Add(WebSocketService service)
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{
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lock (_syncRoot)
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{
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if (_isStopped)
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return null;
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var id = createID();
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_sessions.Add(id, service);
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return id;
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}
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}
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public void Broadcast(byte[] data)
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{
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if (_isStopped)
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broadcast(data);
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else
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broadcastAsync(data);
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}
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public void Broadcast(string data)
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{
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if (_isStopped)
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broadcast(data);
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else
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broadcastAsync(data);
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}
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public Dictionary<string, bool> Broadping(string message)
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{
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var result = new Dictionary<string, bool>();
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foreach (var session in copySessions())
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result.Add(session.Key, session.Value.Ping(message));
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return result;
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}
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public bool Remove(string id)
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{
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lock (_syncRoot)
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{
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return _sessions.Remove(id);
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}
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}
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public bool TryGetByID(string id, out WebSocketService service)
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{
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lock (_syncRoot)
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{
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return _sessions.TryGetValue(id, out service);
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}
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}
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public void Stop()
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{
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Stop(CloseStatusCode.NORMAL, String.Empty);
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}
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public void Stop(CloseStatusCode code, string reason)
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{
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stopSweepTimer();
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lock (_syncRoot)
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{
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if (_isStopped)
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return;
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_isStopped = true;
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foreach (var service in copySessions().Values)
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service.Stop(code, reason);
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}
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}
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public void Sweep()
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{
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if (_isStopped || _isSweeping || Count == 0)
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return;
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lock (_forSweep)
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{
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_isSweeping = true;
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foreach (var id in InactiveID)
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{
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lock (_syncRoot)
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{
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if (_isStopped)
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{
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_isSweeping = false;
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return;
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}
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WebSocketService service;
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if (TryGetByID(id, out service))
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service.Stop(CloseStatusCode.ABNORMAL, String.Empty);
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}
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}
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_isSweeping = false;
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}
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}
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#endregion
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}
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}
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