public async Task ImportAsync(ImportingJobDescriptor descriptor)
{
ShellScope.AddDeferredTask(async defferedTaskContext => {
using (var tx = _transactionManager.BeginTransaction()) {
var importTask = await this.CreateTaskAsync(descriptor);
var context = new ImportingTaskContext(defferedTaskContext.ServiceProvider, _environment.ContentRootFileProvider);
await this.DoImportAsync(importTask, context);
await tx.CommitAsync();
}
});
await Task.CompletedTask;
}
async Task ImportSingleRecordAsync(
ImportingJob importingTask, ImportingTaskContext context, IRecordFinder recordFinder, IRecordImporter recordImporter, IDataSourceReader reader)
{
var propValues = new Dictionary <string, object>(importingTask.Descriptor.ImportEntity.Fields.Count);
foreach (var fieldMapping in importingTask.Descriptor.ImportEntity.Fields)
{
var propertyValueExpression = reader.GetField(fieldMapping.Selector).ToString();
var metaProperty = importingTask.Entity.Fields[fieldMapping.Field];
if (metaProperty.Type.TryParse(metaProperty, propertyValueExpression, out var propertyValue, fieldMapping.Format))
{
propValues.Add(metaProperty.Name, propertyValue);
}
async Task DoImportAsync(ImportingJob importingTask, ImportingTaskContext context)
{
var dataSource = _dataSources.Single(x => x.Format == importingTask.Descriptor.DataSource.Format);
var recordFinderType = typeof(GenericRecordFinder <>).MakeGenericType(importingTask.Entity.ClrType);
var recordFinder = context.ServiceProvider.GetRequiredService(recordFinderType) as IRecordFinder;
var recordImporterType = typeof(GenericRecordImporter <>).MakeGenericType(importingTask.Entity.ClrType);
var recordImporter = context.ServiceProvider.GetRequiredService(recordImporterType) as IRecordImporter;
using (var stream = importingTask.ImportFileInfo.CreateReadStream())
using (var reader = dataSource.Open(stream, importingTask.Descriptor.ImportEntity.Selector)) {
await reader.Initialize();
while (await reader.ReadAsync())
{
await ImportSingleRecordAsync(importingTask, context, recordFinder, recordImporter, reader);
}
}
}
