98 lines
3.7 KiB
C#
98 lines
3.7 KiB
C#
// Copyright (C) 2024, The Duplicati Team
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// https://duplicati.com, hello@duplicati.com
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is 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
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// OR 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
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace Duplicati.Server
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{
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/// <summary>
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/// This class handles synchronized waiting for events
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/// </summary>
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public class EventPollNotify
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{
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/// <summary>
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/// The lock that grants exclusive access to control structures
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/// </summary>
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private readonly object m_lock = new object();
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/// <summary>
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/// The current eventID
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/// </summary>
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private long m_eventNo = 0;
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/// <summary>
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/// The list of subscribed waiting threads
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/// </summary>
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private readonly Queue<System.Threading.ManualResetEvent> m_waitQueue = new Queue<System.Threading.ManualResetEvent>();
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/// <summary>
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/// An eventhandler for subscribing to event updates without blocking
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/// </summary>
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public event EventHandler NewEvent;
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/// <summary>
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/// Gets the current event ID
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/// </summary>
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public long EventNo { get { return m_eventNo; } }
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/// <summary>
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/// Call to wait for an event that is newer than the current known event
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/// </summary>
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/// <param name="eventId">The last known event id</param>
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/// <param name="milliseconds">The number of milliseconds to block</param>
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/// <returns>The current event id</returns>
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public long Wait(long eventId, int milliseconds)
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{
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System.Threading.ManualResetEvent mre;
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lock (m_lock)
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{
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//If a newer event has already occured, return immediately
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if (eventId != m_eventNo)
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return m_eventNo;
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//Otherwise register this thread as waiting
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mre = new System.Threading.ManualResetEvent(false);
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m_waitQueue.Enqueue(mre);
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}
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//Wait until we are signalled or the time has elapsed
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mre.WaitOne(milliseconds, false);
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return m_eventNo;
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}
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/// <summary>
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/// Signals that an event has occurred and notifies all waiting threads
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/// </summary>
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public void SignalNewEvent()
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{
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lock (m_lock)
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{
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m_eventNo++;
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while (m_waitQueue.Count > 0)
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m_waitQueue.Dequeue().Set();
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}
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if (NewEvent != null)
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NewEvent(this, null);
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}
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}
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}
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