public async Task <LendingRecord> CheckoutAsync(string bookId)
{
if (string.IsNullOrWhiteSpace(bookId))
{
throw new ArgumentException("bookId cannot be null");
}
var book = await BookService.GetBookByIdAsync(bookId);
if (book == null)
{
throw new DomainOperationException(string.Format("the book with id \"{0}\" could not be found.", bookId));
}
if (!book.IsAvailable)
{
throw new DomainOperationException("that book is not available for checkout");
}
var lendingRecord = LendingRecord.Create(book.Id, "asdf");
book.Checkout(lendingRecord);
await LendingRecordStore.CreateAsync(lendingRecord);
await BookService.UpdateBookAsync(book);
return(lendingRecord);
}
internal void Checkout( LendingRecord lendingRecord )
{
if( !IsAvailable )
{
throw new DomainOperationException( "this book is not available for checkout" );
}
LendingRecordId = lendingRecord.Id;
IsAvailable = false;
}
internal void Checkout(LendingRecord lendingRecord)
{
if (!IsAvailable)
{
throw new DomainOperationException("this book is not available for checkout");
}
LendingRecordId = lendingRecord.Id;
IsAvailable = false;
}
public async Task <LendingRecord> CheckinAsync(string bookId)
{
LendingRecord record = await LendingRecordStore.GetRecordWithBookIdAsync(bookId);
if (record == null)
{
throw new DomainOperationException("this book could not be checked in because is it not currently on loan.");
}
var book = await BookService.GetBookByIdAsync(bookId);
book.Checkin();
record.Checkin();
await BookService.UpdateBookAsync(book);
await LendingRecordStore.UpdateAsync(record);
return(record);
}