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ServiceHostManager.cs
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ServiceHostManager.cs
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using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.Linq;
using System.Net;
using System.Reflection;
using System.ServiceModel;
namespace Rikrop.Core.Wcf
{
public class ServiceHostManager
{
private readonly IServiceConnection _serviceConnection;
private readonly IServiceHostFactory _serviceHostFactory;
protected Dictionary<Type, ServiceHost> Hosts { get; private set; }
public ServiceHostManager(IServiceConnection serviceConnection, IServiceHostFactory serviceHostFactory)
: this()
{
Contract.Requires<ArgumentNullException>(serviceConnection != null);
Contract.Requires<ArgumentNullException>(serviceHostFactory != null);
_serviceConnection = serviceConnection;
_serviceHostFactory = serviceHostFactory;
}
private ServiceHostManager()
{
Hosts = new Dictionary<Type, ServiceHost>();
}
private static IEnumerable<Type> GetContractsForService(Type service)
{
return service.GetDirectInterfaces().Where(o => o.IsDefined(typeof (ServiceContractAttribute), true));
}
public static ServiceHostManager Create(string host, int port)
{
var serviceConnection = new NetTcpServiceConnection(new DnsEndPoint(host, port));
var serviceHostFactory = new StandardServiceHostFactory();
return new ServiceHostManager(serviceConnection, serviceHostFactory);
}
public void StartServices(Assembly assembly, IEnumerable<Type> exceptedTypes = null)
{
var supportedTypes = GetSupportedTypes(assembly, exceptedTypes);
StartServices(supportedTypes.ToList());
}
public virtual void StartServices(IReadOnlyCollection<Type> services)
{
Contract.Requires<ArgumentNullException>(services != null);
var typesWithContracts = services.ToDictionary(service => service, GetContractsForService);
foreach (var pair in typesWithContracts)
{
var classType = pair.Key;
var contractTypes = pair.Value;
foreach (var contractType in contractTypes)
{
var host = Create(classType, contractType);
OpenHost(host);
Hosts.Add(contractType, host);
}
}
}
public virtual void StopServices()
{
foreach (var serviceHost in Hosts.Values)
{
try
{
CloseHost(serviceHost);
}
catch (Exception)
{
AbortHost(serviceHost);
}
}
}
protected virtual void AddServiceEndpoint(ServiceHost host, Type contractType)
{
if (host != null)
{
var serviceEndpoint = _serviceConnection.CreateServiceEndpoint(contractType);
host.AddServiceEndpoint(serviceEndpoint);
}
}
protected virtual void OpenHost(ServiceHost host)
{
if (host != null)
{
host.Open();
}
}
protected virtual void CloseHost(ServiceHost host)
{
if (host != null)
{
host.Close();
}
}
protected virtual void AbortHost(ServiceHost host)
{
if (host != null)
{
host.Abort();
}
}
protected virtual void OnHostCreation(ServiceHost host)
{
}
protected virtual IEnumerable<Type> GetSupportedTypes(Assembly assembly, IEnumerable<Type> exceptedTypes)
{
exceptedTypes = exceptedTypes ?? Enumerable.Empty<Type>();
return assembly
.GetTypes()
.Where(o => !o.IsInterface && !o.IsAbstract && !o.ContainsGenericParameters)
.Where(o => GetContractsForService(o).Any())
.Except(exceptedTypes);
}
private ServiceHost Create(Type serviceType, Type contractType)
{
var host = _serviceHostFactory.CreateServiceHost(serviceType);
OnHostCreation(host);
AddServiceEndpoint(host, contractType);
return host;
}
}
}