public UnitOfWorkAttribute(IWorkContextProvider workContextProvider, IExecutionContext executionContext, IApplicationDataContext applicationDataContext)
{
this.WorkContextProvider = workContextProvider;
this.ExecutionContext = executionContext;
this.ApplicationDataContext = applicationDataContext;
this.UseTransaction = false;
}
public WorkContext GetContext()
{
//基于这样一个假设：
//上次访问的 ContextProvider 会有更大的几率被下一次调用访问，冷热数据原理，热的更热，所以缓存一下。
WorkContext context = null;
if ((context = _lastProvider?.GetWorkContext()) == null)
{
lock (SyncRoot)
{
if ((context = _lastProvider?.GetWorkContext()) == null)
{
//热数据转冷数据，可以切换 ContextProvider 了
_lastProvider = null;
foreach (var p in _contextProviders)
{
context = p.GetWorkContext();
if (context != null)
{
_lastProvider = p;
break;
}
}
}
}
}
return(context);
}
