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auther: date:2013-06-09
sources:http://landsales.singleton.nsw.gov.au/siteadmin/custom/index.asp
How to do lazy loading in a SOA fashion For example,Discount Windows 7 Professional Key,Windows 7 Key Sale your service could return Invoice POCOs and InvoiceLine POCOs in two separate calls. Now, as the user/caller/client of that service, you can have your own client library that facilitates interacting with the service from your application code. In that client library you could have an Invoice class with a proxy method get_lines() that would call again to the service, get the InvoiceLine POCOs and return those (or some more functional InvoiceLine objects) Obviously, you cannot guarantee that all systems calling your service will use that same client, so the Service should not rely or depend on having that specific client library doing the calls. But for your own application, for your own client purposes, you can have whatever client functionality you want (just like many existing classes wrapping Google Analytics APIs, etc) Certainly you want to reduce the number of round trips. That's a realistic requirement of any SOA. That means you probably have many use cases you want to code for: interface IInvoiceGuid InvoiceId { get; } string InvoiceNumber { get; } string CustomerName { get; } decimal TotalPrice { get; }public IEnumerable FindInvoices(IInvoiceCriteria criteria); interface IInvoiceSummary : IInvoiceint NumberOfLineItems { get; }public IDetailedInvoice GetInvoice(Guid invoiceId); interface IDetailedInvoice : IInvoiceReadOnlyCollection LineItems { get; }Of course if you have different use cases, you may want to change those. Perhaps you want to get unpaid invoices for a customer, but in detailed format, so maybe you have another service point that returns that special case. So, I recommend not building lazy loading into your SOA architecture. Since lazy loading hides the number of round trips to the database, and round trips are something the programmer should always be paying attention to because they're expensive, then you shouldn't hide them.
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