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NHibernate from inside

by Andriy Buday

Kiev ALT.NET

NHibernate guts. Why?Because… it is fun… interesting…

http://andriybuday.com | http://kievalt.net

NHibernate guts. Why?And not so scary as you could have thought


Outline Q1: If build similar ORM ourselves? Q2: How does it look like at glance?

History Community Code base quality

Q3: Dive deeper? Main interaction classes DEMO 1: Debugging fetch logic DEMO 2: Debugging save logic


Let see… if guts could be interesting o_O

Q1: If build similar ORM ourselves?Lets draw…


Q1: If build similar ORM ourselves?This might be the solution we came up with…


Even uglier than real cave drawing

Q2: How does it look like at glance?History


Q2: How does it look like at glance?Community


Q2: How does it look like at glance?NDepend analysis


Q2: How does it look like at glance?NDepend analysis: Application Metrics


L. of code : 62,914L. of comment: 37,113Assemblies : 3Namespaces : 90Types : 2,211Methods : 18,335

Fields : 7,205C# source files : 1,437IL instruction : 437,982Classes : 1,866UT coverage: 75.93%

Q2: How does it look like at glance?Architecture: entity states


Q2: How does it look like at glance?Architecture: more


Q2: How does it look like at glance?Personal opinion: really well-commented


/// <summary>/// Get the alias of the entity encapsulated by this criteria instance./// </summary>/// <value>The alias for the encapsulated entity.</value>string Alias { get; }

/// <summary>/// Was the read-only mode explicitly initialized?/// </summary>/// <returns><c>true</c> if the read-only mode was explicitly initialized, otherwise <c>false</c>.</returns>/// <seealso cref="ICriteria.SetReadOnly(bool)" />/// <seealso cref="ICriteria.IsReadOnly" />///bool IsReadOnlyInitialized { get; }

/// <summary>/// Will entities (and proxies) loaded by this Criteria be put in read-only mode?/// </summary>/// <remarks>/// <para>/// If the read-only setting was not initialized, then the value of the session's/// <see cref="ISession.DefaultReadOnly" /> property is returned instead./// </para>/// <para>/// The read-only setting has no impact on entities or proxies returned by the/// Criteria that existed in the session before the Criteria was executed./// </para>/// </remarks>/// <returns>/// <c>true</c> if entities and proxies loaded by the criteria will be put in read-only mode,/// otherwise <c>false</c>./// </returns>/// <seealso cref="ICriteria.SetReadOnly(bool)" />/// <seealso cref="ICriteria.IsReadOnlyInitialized" />bool IsReadOnly { get; }

/// <summary>/// Used to specify that the query results will be a projection (scalar in/// nature). Implicitly specifies the projection result transformer./// </summary>/// <param name="projection">The projection representing the overall "shape" of the/// query results.</param>/// <returns>This instance (for method chaining)</returns>/// <remarks>/// <para>/// The individual components contained within the given <see cref="IProjection"/>/// determines the overall "shape" of the query result./// </para>/// </remarks>ICriteria SetProjection(params IProjection[] projection);

Don’t read code – see how green it is

Q2: How does it look like at glance?Personal opinion: a lot of noise in code


if (cmd.Connection != null){ // make sure the commands connection is the same as the Sessions connection // these can be different when the session is disconnected and then reconnected if (cmd.Connection != sessionConnection) { cmd.Connection = sessionConnection; }}else{ cmd.Connection = sessionConnection;}

Now read code!Don’t you think it can be replaced?cmd.Connection = sessionConnection;

Q3: Dive deeper?Lets have some fun with code & debugging…


Q3: Dive deeper?Lets have some fun with code & debugging…


OverviewDEMO 1: Debugging fetchDEMO 2: Debugging save

Questions?


Ask me something! But easy!

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@andriybuday

http://andriybuday.com/

http://kievalt.net/

[email protected]

http://andriybuday.blogspot.com/

http://kievalt.net/

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Links


My blog: http://andriybuday.com

Kiev ALT.NET: http://kievalt.net/

NHibernate: Home Page: http://nhforge.org/ Source Code: https://github.com/nhibernate/nhibernate-core Screencasts: http://www.summerofnhibernate.com/ Reference: http://www.nhforge.org/doc/nh/en/index.html NDepend analysis:

http://www.ndepend.com/SampleReports/OnNHibernate/NDependReport.html So what’s NH development look like:

http://elegantcode.com/2008/12/07/so-whats-nhibernate-development-like/ Mapping by code: http://fabiomaulo.blogspot.com/2011/04/nhibernate-32-mapping-by-code.html

http://andriybuday.blogspot.com/

http://kievalt.net/

http://nhforge.org/

https://github.com/nhibernate/nhibernate-core

http://www.summerofnhibernate.com/

http://www.nhforge.org/doc/nh/en/index.html

http://www.ndepend.com/SampleReports/OnNHibernate/NDependReport.html

http://elegantcode.com/2008/12/07/so-whats-nhibernate-development-like/

http://fabiomaulo.blogspot.com/2011/04/nhibernate-32-mapping-by-code.html