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/*
* Copyright (c) 2023 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Essentials.ServiceStack
* File: HttpServiceStackBuilder.cs
*
* HttpServiceStackBuilder.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.Collections.Generic;
using VNLib.Net.Http;
namespace VNLib.Plugins.Essentials.ServiceStack
{
/// <summary>
/// A data structure used to build/create a <see cref="HttpServiceStack"/>
/// around a <see cref="ServiceDomain"/>
/// </summary>
public sealed class HttpServiceStackBuilder
{
private readonly LinkedList<HttpServer> _servers;
/// <summary>
/// The built <see cref="HttpServiceStack"/>
/// </summary>
public HttpServiceStack ServiceStack { get; }
/// <summary>
/// Gets the underlying <see cref="ServiceDomain"/>
/// </summary>
public ServiceDomain ServiceDomain { get; }
/// <summary>
/// Initializes a new <see cref="HttpServiceStack"/> that will
/// generate servers to listen for services exposed by the
/// specified host context
/// </summary>
public HttpServiceStackBuilder()
{
ServiceDomain = new();
_servers = new();
ServiceStack = new(_servers, ServiceDomain);
}
/// <summary>
/// Builds all http servers from
/// </summary>
/// <param name="config">The http server configuration to user for servers</param>
/// <param name="getTransports">A callback method that gets the transport provider for the given host group</param>
public void BuildServers(in HttpConfig config, Func<ServiceGroup, ITransportProvider> getTransports)
{
//enumerate hosts groups
foreach (ServiceGroup hosts in ServiceDomain.ServiceGroups)
{
//get transport for provider
ITransportProvider transport = getTransports.Invoke(hosts);
//Create new server
HttpServer server = new(config, transport, hosts.Hosts.Select(static h => h.Processor as IWebRoot));
//Add server to internal list
_servers.AddLast(server);
}
}
/// <summary>
/// Releases any resources that may be held by the <see cref="ServiceDomain"/>
/// incase of an error
/// </summary>
public void ReleaseOnError()
{
ServiceStack.Dispose();
}
}
}
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