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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Runtime
* File: SharedPluginServiceProvider.cs
*
* SharedPluginServiceProvider.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.ComponentModel.Design;
using VNLib.Utils;
using VNLib.Plugins.Runtime.Services;
namespace VNLib.Plugins.Runtime
{
/// <summary>
/// Represents a single shared pool for a collection of plugins to
/// export services to.
/// </summary>
public sealed class SharedPluginServiceProvider :
VnDisposeable,
IServiceProvider,
IPluginEventListener
{
private readonly ServiceContainer _serviceContainer = new();
private readonly object _syncRoot = new();
///<inheritdoc/>
public object? GetService(Type serviceType) => _serviceContainer.GetService(serviceType);
/// <summary>
/// Gets the service object of the specified type.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns>
/// A service object of type serviceType. -or- null if
/// there is no service object of type serviceType.
/// </returns>
public T? GetService<T>() where T : class => GetService(typeof(T)) as T;
void IPluginEventListener.OnPluginLoaded(PluginController controller, object? state)
{
//Add services
AddOrRemoveServices(controller, true);
}
void IPluginEventListener.OnPluginUnloaded(PluginController controller, object? state)
{
//Remove services
AddOrRemoveServices(controller, false);
}
private void AddOrRemoveServices(PluginController controller, bool add)
{
/*
* Depending on when services are loaded/unloaded, this instances
* may be disposeed so avoid raising an exception for a condition
* that doenst matter. If disposed, we dont need to clean anything up
*/
if (Disposed)
{
return;
}
//Get all exported services
PluginServiceExport[] exports = controller.GetExportedServices();
//We need to hold a lock to synchronize access to the service container
lock (_syncRoot)
{
//if add flag is set, add the serivces, otherwise remove them
if (add)
{
Array.ForEach(exports, e => _serviceContainer.AddService(e.ServiceType, e.Service));
}
else
{
Array.ForEach(exports, e => _serviceContainer.RemoveService(e.ServiceType));
}
}
//cleanup any disposable services when removing
if (!add)
{
foreach(PluginServiceExport export in exports)
{
if(export.Service is IDisposable disposable)
{
disposable.Dispose();
}
}
}
}
///<inheritdoc/>
protected override void Free() => _serviceContainer.Dispose();
}
}
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