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/*
* Copyright (c) 2023 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Essentials.ServiceStack
* File: ManagedPlugin.cs
*
* ManagedPlugin.cs is part of VNLib.Plugins.Essentials.ServiceStack which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Essentials.ServiceStack 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 2 of the
* License, or (at your option) any later version.
*
* VNLib.Plugins.Essentials.ServiceStack 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;
using System.Linq;
using System.Reflection;
using System.ComponentModel.Design;
using VNLib.Plugins.Runtime;
using VNLib.Plugins.Attributes;
namespace VNLib.Plugins.Essentials.ServiceStack
{
internal sealed class ManagedPlugin : IManagedPlugin
{
internal RuntimePluginLoader Plugin { get; }
///<inheritdoc/>
public string PluginPath => Plugin.Config.AssemblyFile;
private ServiceContainer? _services;
public ManagedPlugin(RuntimePluginLoader loader) => Plugin = loader;
///<inheritdoc/>
public IServiceContainer Services
{
get
{
_ = _services ?? throw new InvalidOperationException("The service container is not currently loaded");
return _services!;
}
}
///<inheritdoc/>
public PluginController Controller => Plugin.Controller;
/*
* Automatically called after the plugin has successfully loaded
* by event handlers below
*/
internal void OnPluginLoaded()
{
//If the service container is defined, dispose
_services?.Dispose();
//Init new service container
_services = new();
//Get types from plugin
foreach (LivePlugin plugin in Plugin.Controller.Plugins)
{
/*
* Get the exposed configurator method if declared,
* it may not be defined.
*/
ServiceConfigurator? callback = plugin.PluginType.GetMethods()
.Where(static m => m.GetCustomAttribute<ServiceConfiguratorAttribute>() != null && !m.IsAbstract)
.Select(m => m.CreateDelegate<ServiceConfigurator>(plugin.Plugin))
.FirstOrDefault();
//Invoke if defined to expose services
callback?.Invoke(_services);
}
}
internal void OnPluginUnloaded()
{
//Cleanup services no longer in use. Plugin is still valid until this method returns
_services?.Dispose();
//Remove ref to services
_services = null;
}
}
}
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