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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Essentials.ServiceStack
* File: ServiceDomain.cs
*
* ServiceDomain.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.Collections.Generic;
using VNLib.Utils.Extensions;
using VNLib.Plugins.Essentials.ServiceStack.Construction;
namespace VNLib.Plugins.Essentials.ServiceStack
{
/// <summary>
/// Represents a domain of services and thier dynamically loaded plugins
/// that will be hosted by an application service stack
/// </summary>
public sealed class ServiceDomain
{
private ServiceGroup[] _serviceGroups = [];
/// <summary>
/// Gets all service groups loaded in the service manager
/// </summary>
public IReadOnlyCollection<ServiceGroup> ServiceGroups => _serviceGroups;
/// <summary>
/// Uses the supplied callback to get a collection of virtual hosts
/// to build the current domain with
/// </summary>
/// <param name="hostBuilder">The callback method to build virtual hosts</param>
/// <returns>A value that indicates if any virtual hosts were successfully loaded</returns>
public void BuildDomain(ServiceBuilder hostBuilder)
{
ArgumentNullException.ThrowIfNull(hostBuilder);
FromExisting(hostBuilder.BuildGroups());
}
/// <summary>
/// Builds the domain from an existing enumeration of virtual hosts
/// </summary>
/// <param name="hosts">The enumeration of virtual hosts</param>
/// <returns>A value that indicates if any virtual hosts were successfully loaded</returns>
public void FromExisting(IEnumerable<ServiceGroup> hosts)
{
ArgumentNullException.ThrowIfNull(hosts);
hosts.ForEach(h => _serviceGroups = [.. _serviceGroups, h]);
}
/// <summary>
/// Tears down the service domain by destroying all <see cref="ServiceGroup"/>s. This instance may be rebuilt
/// if this method returns successfully.
/// </summary>
public void TearDown()
{
//Manually cleanup if unload missed data
Array.ForEach(_serviceGroups, static sg => sg.UnloadAll());
Array.Clear(_serviceGroups);
_serviceGroups = [];
}
}
}
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