/// <summary>
/// 初始化 <see cref="DefaultContextService"/> 类的新实例。
/// </summary>
/// <param name="context"></param>
/// <param name="databaseFactory">一个用于创建 <see cref="IDatabase"/> 的工厂函数。</param>
public DefaultContextService(EntityContextInitializeContext context, Func <IProvider, ConnectionString, IDatabase> databaseFactory)
: base(context)
{
var options = context.Options;
Func <IDatabase> factory = null;
if (DatabaseScope.Current != null)
{
factory = () => DatabaseScope.Current.Database;
}
else if (databaseFactory != null)
{
factory = () => databaseFactory(context.Provider, context.ConnectionString);
}
else if (context.Provider != null && context.ConnectionString != null)
{
factory = () => new Database(context.ConnectionString, context.Provider);
}
else if (options != null)
{
factory = () => DatabaseFactory.CreateDatabase(options.ConfigName);
}
if (factory != null)
{
Database = EntityDatabaseFactory.CreateDatabase(InstanceName, factory);
Provider = Database.Provider;
}
}
internal static string TryAdd(EntityContextInitializeContext context)
{
lock (instances)
{
var item = instances.FirstOrDefault(s => s.Value == context);
if (!string.IsNullOrEmpty(item.Key))
{
return(item.Key);
}
var key = RandomGenerator.Create();
instances.TryAdd(key, context);
return(key);
}
}
/// <summary>
/// 初始化。
/// </summary>
private void Initialize(EntityContextOptions options)
{
Guard.ArgumentNull(options, nameof(options));
EntityContextInitializeContext initContext = null;
if (options.ContextFactory != null)
{
initContext = options.ContextFactory();
}
else
{
var section = ConfigurationUnity.GetSection <InstanceConfigurationSection>();
if (section != null)
{
IInstanceConfigurationSetting setting;
if (!string.IsNullOrEmpty(options.ConfigName))
{
setting = section.Settings[options.ConfigName];
}
else
{
setting = section.Default;
}
initContext = new EntityContextInitializeContext(options, ProviderHelper.GetDefinedProviderInstance(setting), setting.ConnectionString);
}
}
if (initContext == null || initContext.Provider == null)
{
throw new InvalidOperationException(SR.GetString(SRKind.MustAssignEntityContextInitializeContext));
}
initContext.Options = options;
var provider = initContext.Provider.GetService <IContextProvider>();
service = provider.CreateContextService(initContext);
if (service != null)
{
service.OnRespositoryChanged = OnRespositoryChanged;
}
}
/// <summary>
/// 初始化 <see cref="ContextServiceBase"/> 类的新实例。
/// </summary>
/// <param name="context"></param>
public ContextServiceBase(EntityContextInitializeContext context)
{
InitializeContext = context;
InstanceName = ContextInstanceManager.TryAdd(context);
}
IContextService IContextProvider.CreateContextService(EntityContextInitializeContext context)
{
var factory = context.DatabaseFactory ?? new Func <IProvider, ConnectionString, IDatabase>((p, s) => new Database(s, p));
return(new DefaultContextService(context, factory));
}
IContextService IContextProvider.CreateContextService(EntityContextInitializeContext context)
{
return(new DefaultContextService(context, context.DatabaseFactory));
}
