Welcome to Grigori Melnik’s talk onMicrosoft Enterprise Library 5.0@ patterns & practices symposium 2010

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Context

Reusable components are important− Address common enterprise development

challenges consistently across applications Application Blocks are a form factor for reusable components

− Reusable, testable, extensible and modifiable source code− + docs, hands-on labs

Enterprise Library is a set of general purpose application blocks− Not specific to any one application type or architectural style

Can be used as-is or as a starting point for your own libraries or frameworks

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YOU SIMPLY CANNOT AFFORD NOT TO REUSE!

WHEN IT COMES TO CODE WRITING, LESS IS MORE!

Enterprise Library – Big Picture

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EntLib Design Goals

Consistency (Логическая последовательность)− Blocks are written with and used in common patterns

Extensibility (Расширяемость)− Pluggable extension points

Ease of use (Простота эксплуатации)− Config tool, tons of docs, simple interfaces, labs, webcasts

Integration (Интеграционная слаженность)− Work well together or separately

Key themes

Ease of use Learnability Less intrusive Better testability Simplification inside and out

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No new blocks

Healthy code

Where were we?

EntLib 4.x

Caching

Security

Data Access

Logging

Exception

Handling

Plug-in

Config

Helpers

& Design

Instrumen-

tation

Object

Builder2

Cryptography

CorePolicy

Injecti

on

Validation

Unity DI

Unity Exte

nsions

Client A

pp

Where are we going?

Conceptual Architecture

Functional blocks Wiring blocks

Functional blocks Common Infrastructure

Structural/wiring blocks

Security

Data Access

Cryptography

Validation

Logging

Caching ExceptionHandling

Unity

Config Instrumen-tation

PolicyInjection

Enterprise Library – Conceptual Architecture

A-la carteapproach

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You only need to usefeatures relevant to you!

.NET 4.0 / VS 2010

Binaries– Signed– Target .NET 3.5 SP1– Work unchanged in .NET 4.0 projects

Source– VS 2008 sln/proj targeting 3.5 SP1– VS 2010 sln/proj targeting 4.0

Config tool– Fully integrated editor in VS 2008– Launcher from VS 2010 (like WCF config tool)

Ease of use! Demo

Adding logging to your app in~3 mins!

Getting Enterprise Library objects

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Config Experience

New config tool IntelliSense in XML editor Programmatic config support New configuration sources

Config Tool Stories

Usability: Improve intuitiveness & learnability

Simplicity: Reduce the number of design time assemblies

Extensibility: Simplify the way config for custom handlers/providers/blocks can be plugged into the config tool

Config Tool Experience Demo

Twelve Architecture &Usage of EntLib

Fluent Configuration Interface

Motivation:– Customer requested a better way to configure EntLib

programmatically– Make our own test cases more readable

Ref: Martin Fowler, Eric Evans. http://martinfowler.com/bliki/FluentInterface.html

Programmatic Config Experience Demo

Hierarchical / Redirected config

Use a non-default config store Split config into multiple physical files Combine them at runtime Allows master + override style of config

– Runtime version of environmental overrides

Logging Block Performance

Originally, planned to implement async logging Perf analysis of the lower level operations of the

logging block (v4.1) showed:− The formatter took 54% of the total time− Of this, the most expensive operations are:

11.76 Getting the machine name 9.63 Computing Severity textual representation 5.70 Undetermined mscorwks.dll work 5.17 Computing DateTime textual representation 4.46 StringBuilder.Append 4.10 Getting the process name

upto 20%global

improvement

Higher Performing Logging – Preliminary Results

Formatter responsible for ~50% of the execution time Improvements

45% local improvement

53% local improvement

N=1M

New in Data Access Application Block

Processing Results Data Access block traditionally made it easier to call sprocs Processing the results still means dropping back into classic

ADO.NET code

Issue: how could we make it easier to consume the results of a sproc?

Introducing Data Accessors

Basic idea:– Instead of operating on data readers and data records that you get from

a query, get back an IEnumerable<T>– Now we can do LINQ to Objects magic

Accessors– provide a higher level abstraction that combines the command,

input mapping, output mapping, and result set management into a single object.

Note: Accessors are easily injectable

Data Accessors

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before

after

DAAB AccessorsDemo

DAAB Accessors != ORM

Async DAAB

− Database API addition− Follows classic Begin/End async pattern

NonQuery Scalar Reader XmlReader (SQL Server only)

− Not supported on all databases

Async Data Access

var db =

EnterpriseLibraryContainer.Current.GetInstance<Database>();

if(db.SupportsAsync) { db.BeginExecuteScalar("Get Top Ten Products", CompletionMethod);}

public void CompletionMethod(IAsyncResult async){ int count = (int)db.EndExecuteScalar(async); ...}

Policy Injection Application Block Goals

Separate cross-cutting concerns from business logic− Use interception and injection to apply policies at runtime− Provide a declarative way of specifying which policies are applied where− Define policies using configuration or attributes

Leverage other application blocks to implement common cross-cutting concerns − Validation, Logging, Authorization, Exception Handling, Caching,

Performance Counters Provide flexibility in interception mechanisms Aspect-Oriented Programming (AOP )

Interception

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Interceptors

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Interceptors – Pros & Cons

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Power of Interception Demo

Learnability

With contributions by Nicolas Botto, Bob Brumfield, Grigori Melnik,Erik Renaud, Fernando Simonazzi, Chris Tavares

Key Takeaways

Reuse for the win! Improving user experience Simpler, more consistent code base Simpler to configure and use Better support for DI-style of development Focus on testability and maintainability

Engage with us!

Call for Action1. New to EntLib:

1. Start with reading the Dev Guide

2. Download Hands-on labs (5.0)

3. Play!

2. Seasoned EntLib user:1. Evaluate v5.02. Read Migration guide3. Experiment with migration4. Provide feedback!5. Tell your story

Resources Released Enterprise Library and related resources:

− msdn.microsoft.com/entlib Discussions, learning resources and support:

− entlib.codeplex.com− unity.codeplex.com

Enterprise Library Community Extensions:− entlibcontrib.codeplex.com

patterns & practices dev center− msdn.microsoft.com/practices

Grigori’s contacts:− grigori.melnik@microsoft.com

− blogs.msdn.com/agile− @gmelnik

Спасибо!