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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Runtime
* File: AssemblyWatcher.cs
*
* AssemblyWatcher.cs is part of VNLib.Plugins.Runtime which is part
* of the larger VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Runtime is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation, either version 2 of the License,
* or (at your option) any later version.
*
* VNLib.Plugins.Runtime 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with VNLib.Plugins.Runtime. If not, see http://www.gnu.org/licenses/.
*/
using System;
using System.IO;
using System.Threading;
using VNLib.Utils;
using VNLib.Utils.IO;
using VNLib.Utils.Extensions;
namespace VNLib.Plugins.Runtime
{
internal static class AssemblyWatcher
{
internal static IDisposable WatchAssembly(IPluginReloadEventHandler handler, IPluginAssemblyLoader loader)
{
ArgumentNullException.ThrowIfNull(handler);
ArgumentNullException.ThrowIfNull(loader);
DebouncedFSEventHandler dbh = new(loader, handler);
FileWatcher.Subscribe(loader.Config.AssemblyFile, dbh);
return dbh;
}
internal sealed class DebouncedFSEventHandler : VnDisposeable, IFSChangeHandler
{
private readonly IPluginReloadEventHandler _handler;
private readonly IPluginAssemblyLoader _loaderSource;
private readonly Timer _delayTimer;
private bool _pause;
public DebouncedFSEventHandler(IPluginAssemblyLoader loader, IPluginReloadEventHandler handler)
{
_handler = handler;
_loaderSource = loader;
//setup delay timer to wait on the config
_delayTimer = new(OnTimeout, null, Timeout.InfiniteTimeSpan, Timeout.InfiniteTimeSpan);
}
///<inheritdoc/>
void IFSChangeHandler.OnFileChanged(FileSystemEventArgs e)
{
//if were already waiting to process an event, we dont need to stage another
if (_pause)
{
return;
}
//Set pause flag
_pause = true;
//Restart the timer to trigger reload event on elapsed
_delayTimer.Restart(_loaderSource.Config.ReloadDelay);
}
private void OnTimeout(object? state)
{
_delayTimer.Stop();
//Fire event, let exception crash app
_handler.OnPluginUnloaded(_loaderSource);
//Clear pause flag
_pause = false;
}
protected override void Free()
{
_delayTimer.Dispose();
FileWatcher.Unsubscribe(_loaderSource.Config.AssemblyFile, this);
}
}
}
}
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