Mastering Spring.NET: A Comprehensive Guide to Application Context and AOP Integration

SpringFramework.Net Developer Session The Peer Frameworks Series - .Net and Java Chris Donnan

Desktop Windows Services 3rd Party Integration Web AOP Services Data Access Core SpringFramework.net 50,000 Ft View

Application Context “One Singleton to rule them all” • The IApplicationContext is the ‘normal’ top level entry point to use • SpringFramework.net • Inside you will find (along with other stuff) implementation of: • IObjectFactory • IResourceLocator • These are the interfaces that are most used in day to day programming • With Spring.

Spring ObjectFactory • The center of it all… Since the Application Context is an IObjectFactory – you can use it To act as a ‘dynamic factory’ for your objects. You simply ask the factory for your object – and you use it as you normally Would use any “new’d” object. The real beauty is that Spring manages assembling that object for you – Giving it whatever dependencies it needs.

Spring Resource Abstractions You can also use the IApplicationContext’s IResourceLocator interface: This allows you to get your resources from wherever they may be. This could Be at a URL, a File, an Embedded Resource, etc.

Spring.net Demo • DEMO. • Building a complex business object with many dependencies • Prototypes and singletons • Populating collections

Aspect Oriented Programming • Cross Cutting functionality • Logging • Transactions • Security • Other code that tend to repeat across an application

AOP Basic code – nothing special

AOP

AOP Code to invoke programmatically Output from execution

AOP XML Conifguration Same as programmatic usage – XML Configuration

AOP

Spring Web • Bidirectional data binding • Via attributes • Master Pages in .Net 1x • Dependency Injection for ASP.NET pages/ web services • Result Mapping • MVC Framework for ASP.Net

Data Binding public class UserRegistration : Spring.Web.UI.Page { [Binding("Text", "UserInfo.Email")] protected TextBox email; [Binding("Text", "UserInfo.Address.PostalCode")] protected TextBox postalCode; ……. } *Notice it uses Expression synatax

Result Mapping Used to externalize the mapping of action results to target pages: <object id="homePageResult" type="Spring.Web.Support.Result, Spring.Web"> <property name="TargetPage" value="~/Default.aspx"/> <property name="Mode" value="Transfer"/> <property name="Parameters"> <dictionary> <entry key="literal" value="My Text"/> <entry key="name" value="${UserInfo.FullName}"/> <entry key="host" value="${Request.UserHostName}"/> </dictionary> </property> </object>

Spring Data Access and Transactions • ADO.Net • Hibernate • IBatis.net • Basic patterns and utility classes/ base classes to speed up creating DAO and templated data access classes. • Transaction support • The goal is to reduce code needed to get rolling!

Hibernate Code Examples public class NHTestObjectDao : HibernateDaoSupport, ITestObjectDao { [Transaction()] public void Create(TestObject to) { HibernateTemplate.Save(to); } }

Hibernate Config Example <object id="DbProvider" type="Spring.Data.Support.SqlProvider, Spring.Data"> <property name="ConnectionString" value="Data Source=(local);Database=Spring;User ID=springqa;Password=springqa;Trusted_Connection=False"/> </object> <object id="SessionFactory" type="Spring.NHibernate.LocalSessionFactoryObject, Spring.NHibernate"> <property name="DbProvider" ref="DbProvider"/> <property name="MappingAssemblies"> <list> <value>Spring.NHibernate.Integration.Tests</value> </list> </property> <property name="HibernateProperties"> <dictionary> … </dictionary> </property> </object>

Spring Expressions Evaluation of text expressions against live objects. Sort of like XPath for objects. Simple Example: Inventor tesla = new Inventor("Nikola Tesla", new DateTime(1856, 7, 9), "Serbian"); tesla.PlaceOfBirth.City = "Smiljan"; string evaluatedName = (string) ExpressionEvaluator.GetValue(tesla, "Name"); string evaluatedCity = (string) ExpressionEvaluator.GetValue(tesla, "PlaceOfBirth.City"));

Expressions Continued This can get more complex. You can evaluate objects sub parts, sub parts, etc. Inventor pupin = (Inventor) ExpressionEvaluator.GetValue(ieee, "Officers['president']"; string city = (string) ExpressionEvaluator.GetValue(ieee, "Officers['president'].PlaceOfBirth.City"); ExpressionEvaluator.SetValue(ieee, "Officers['advisors'][0].PlaceOfBirth.Country", "Croatia"); In the latest Spring.net release- there is support of literals, logic, properties, indexers, arrays, types, and lots more

SpringFramework.net DAF • Desktop Application Framework • Pub/ Sub like events • UI Application Container • Injection of dependencies into Controls/ Forms • Model/ View/ Controller | Presenter infrastructure • UI Services Model (ways to GET UI services in a consistent way) • Toolbars • Docking Managers • Status Bars - etc • Databind binding framework • Grid Binding • Expression based simple binding • Object Views (alternative to attributes) • Expression based validation

The Peer Frameworks Series - .Net and Java • 1) Spring Framework Developer Session - SpringFramework.net, SpringFramework.org2) Test Drive Development Developer Session - NUnit, JUnit; Rhino Mocks in .net and Easy Mock in Java3) Db4o Developer Session - Open Source Object Database in .net and Java4) ORM Developer Session - Hibernate, NHibernate / IBatis

Ruby does IoC Concrete Implementations

Mastering Spring.NET: A Comprehensive Guide to Application Context and AOP Integration