如何将Autofac Modules与Multitenant套餐结合使用?
这是Autofac的引导部分:
var builder = new ContainerBuilder();
// only very basic common registrations here...
// everything else is in modules
// Register the Autofac module for xml configuration as last
// module to allow (emergency) overrides.
builder.RegisterModule(new ConfigurationSettingsReader());
// create container for IoC
this.container = builder.Build();
// check for tenant strategy -> if exists, go multi-tenant
if (this.container.IsRegistered<ITenantIdentificationStrategy>())
{
var tenantIdentificationStrategy = this.container
.Resolve<ITenantIdentificationStrategy>();
this.container = new MultitenantContainer(tenantIdentificationStrategy,
this.container);
// how to use xml modules instead of manually register at this point?
}
else
{ ... }
我不想打电话给
container.ConfigureTenant('1', b => b.RegisterType<Tenant1Dependency>()
.As<IDependency>()
.InstancePerDependency());
在引导程序中(不需要了解这一点)。
相反,我想做这样的事情:
public class TenantModule : Module
{
protected override void Load(ContainerBuilder builder)
{
container.ConfigureTenant('1', b => b.RegisterType<Tenant1Dependency>()
.As<IDependency>()
.InstancePerDependency());
container.ConfigureTenant('2', b => b.RegisterType<Tenant2Dependency>()
.As<IDependency>()
.InstancePerDependency());
...
我的第一个想法是检查何时为特殊租户注册:
public class TenantModule : Module
{
protected override void Load(ContainerBuilder builder)
{
builder.Register((c, p) => {
var s = c.Resolve<ITenantIdentificationStrategy>();
if (s != null)
{
var id = s.IdentifyTenant<string>();
...
}
});
我可以检查id并仅在id适合时注册,但如果id不匹配则返回什么?空值? DoNothingObject?对我来说代码看起来很奇怪/可怕
builder.Register("1", (context, parameters) => ...
感觉更自然。但我不知道如何通过Autofac实现这一目标。我错过了什么?你是怎么解决这个问题的?
答案 0 :(得分:2)
错过了ConfigureTenant也通过了containerBuilder这一点,它允许注册租户特定的ConfigurationSectionReader。因此,可以选择具有额外的客户/租户特定ConfigurationSection:
mtc.ConfigureTenant("mytenant1",
containerBuilder =>
{
containerBuilder.RegisterModule(new ConfigurationSettingsReader("mytenant1"));
}
);
mtc.ConfigureTenant("mytenant2",
containerBuilder =>
{
containerBuilder.RegisterModule(new ConfigurationSettingsReader("mytenant2"));
}
);
这也让我想到我可以先解决租户识别策略,获取标识符并只为当前租户注册(如客户特定的引导程序):
var tenantIdentificationStrategy = container.Resolve<ITenantIdentificationStrategy>();
var tid = tenantIdentificationStrategy.IdentifyTenant<string>();
mtc.ConfigureTenant(tid ,
containerBuilder =>
{
containerBuilder.RegisterModule(new ConfigurationSettingsReader(tid));
// or something like that which identifies the tenant config section
}
);
或者我可以把它变成一个简单的foreach来为所有可用的租户进行注册(但这在大多数情况下都很奇怪,因为只有一个租户会在其引导部分得到解决,也许是其他特殊情况值得的提)。
有更好的想法吗?我会投票赞成更好的想法......; - )