smithsson68@gmail.com
Jul 6, 2011
  5094
(2 votes)

Session and Unit Of Work for Dynamic Data Store

I’ve created a couple of classes that make it even easier to work with the Dynamic Data Store:

DynamicDataStoreSession

This wraps the main functionality of a DynamicDataStore instance with the following additional benefits:

  • Thread Safe – Ensures all calls to a session instance are done from the same thread that created it and throws an exception if not. This is done because a DynamicDataStore instance is not thread safe but has no enforcement thus resulting in weird errors when used from multiple threads
  • Specify Type Only Once - When working with the DDS you need to specify the Type in the call to DynamicDataStoreFactory.CreateStore/GetStore and then again when calling Load / Find / Items etc. on a DynamicDataStore instance. This is because the Type passed to CreateStore/GetStore is used to derive the store's name and the Type passed to Load / Find / Items defines what container to load the properties from the store into. The DynamicDataStoreSession is a generic class so the Type you pass as a generic argument is used in all cases where needed. E.g.
    var session = new DynamicDataStoreSession<Person>();
    var people = from person in session.Items
                 where person.FirstName == "Jones"
                 select person;
  • Find requires no magic strings - The Find method of the DynamicDataStore takes a string property name and value (or collection of). Some people quite rightly don't like using 'magic' strings in this way. The DynamicDataStoreSession provides a Find method where property names can be specified by using a lambda expression (thanks to Anders Hattestad for this). It also has a LINQ style method chaining syntax. E.g.
    var session = new DynamicDataStoreSession<Person>();
    var people = session.Find()
                 .Where(p => p.LastName)
                 .Equals("Jones")
                 .And(p => p.FirstName)
                 .Equals("Mark")
                 .Go();
  • IoC / Mocking / Unit Testing - The DynamicDataStoreSession and associated find classes implement interfaces. They also allow constructor injection of a DynamicDataStoreFactory

DynamicDataStoreUnitOfWork

It has always been possible to implement ‘unit of work’ / transactions between DDS stores and external data sources. The DynamicDataStoreUnitOfWork class wraps this functionality up nicely and should be used like a TransactionScope in a using block.

class Person
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public Identity AddressId { get; set; }
}

public class Address
{
    public string Line1 { get; set; }
    public string Line2 { get; set; }
    public string City { get; set; }
}

using (var work = new DynamicDataStoreUnitOfWork())
{
    var addressSession = work.GetSession<Address>();
    var addressId = addressSession.Save(new Address()
    {
        Line1 = "Main Street",
        City = "Chicago"
    });

    var personSession = work.GetSession<Person>();
    personSession.Save(new Person()
    {
        FirstName = "Paul",
        LastName = "Smith",
        AddressId = addressId
     });

    work.Complete();
}

You can get an assembly here or if you want the source code then download the EPiServer.Extensions.DynamicDataStore.1.0.nupkg from nuget.episerver.com.

Jul 06, 2011

Comments

Please login to comment.
Latest blogs
Customizing Property Lists in Optimizely CMS

Generic property lists is a cool editorial feature that has gained a lot of popularity - in spite of still being unsupported (officially). But if y...

Allan Thraen | Oct 2, 2022 | Syndicated blog

Content Delivery API – The Case of the Duplicate API Refresh Token

Creating a custom refresh provider to resolve the issues with duplicate tokens in the DXC The post Content Delivery API – The Case of the Duplicate...

David Lewis | Sep 29, 2022 | Syndicated blog

New Optimizely certifications - register for beta testing before November 1st

In January 2023, Optimizely is making updates to the current versions of our certification exams to make sure that each exam covers the necessary...

Jamilia Buzurukova | Sep 28, 2022

Optimizely community meetup - Sept 29 (virtual + Melbourne)

Super excited to be presenting this Thursday the 29th of September at the Optimizely community meetup. For the full details and RSVP's see the...

Ynze | Sep 27, 2022 | Syndicated blog

Preview multiple Visitor Groups directly while browsing your Optimizely site

Visitor groups are great - it's an easy way to add personalization towards market segments to your site. But it does come with it's own set of...

Allan Thraen | Sep 26, 2022 | Syndicated blog

The Report Center is finally back in Optimizely CMS 12

With Episerver.CMS.UI 12.12.0 the Report Center is finally re-introduced in the core product.

Tomas Hensrud Gulla | Sep 26, 2022 | Syndicated blog