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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Library: VNLib
* Package: ObjectCacheServer
* File: CachePeerMonitor.cs
*
* CachePeerMonitor.cs is part of ObjectCacheServer which is part of the larger
* VNLib collection of libraries and utilities.
*
* ObjectCacheServer is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* ObjectCacheServer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see https://www.gnu.org/licenses/.
*/
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.Collections.Generic;
using VNLib.Utils;
using VNLib.Utils.Extensions;
namespace VNLib.Data.Caching.ObjectCache.Server.Clustering
{
internal sealed class CachePeerMonitor : VnDisposeable, IPeerMonitor
{
private readonly List<ICachePeer> peers = new();
private readonly ManualResetEvent newPeerTrigger = new (false);
/// <summary>
/// Waits for new peers to connect to the server
/// </summary>
/// <returns>A task that complets when a new peer has connected</returns>
public async Task WaitForChangeAsync()
{
await newPeerTrigger.WaitAsync();
//Reset the trigger for next call
newPeerTrigger.Reset();
}
///<inheritdoc/>
public IEnumerable<ICachePeer> GetAllPeers()
{
lock(peers)
{
return peers.ToArray();
}
}
///<inheritdoc/>
public void OnPeerConnected(ICachePeer peer)
{
//When a peer is connected we can add it to the list so the replication manager can see it
lock(peers)
{
peers.Add(peer);
}
//Trigger monitor when change occurs
if(peer.Advertisment != null)
{
newPeerTrigger.Set();
}
}
///<inheritdoc/>
public void OnPeerDisconnected(ICachePeer peer)
{
//When a peer is disconnected we can remove it from the list
lock(peers)
{
peers.Remove(peer);
}
}
protected override void Free()
{
peers.Clear();
newPeerTrigger.Dispose();
}
}
}
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