ASP.NET Web API + minimal touch MEF

Monday, November 11, 2013

ASP.NET Web API + minimal touch MEF this post will offer light touching technique of introducing MEF to ASP.NET Web API. the motivation for having MEF (or any other IoC container) for Web API is for dependencies abstraction and testability. it is also easier to design your API by Contract (mining that you don't have to think about the actual implementation at design time). so why minimal touch? even those other suggestion can be found, most of them involve custom routing. the risk of alter ASP.NET Web API routing, is...

Immutable Collections

Sunday, February 17, 2013

Immutable Collections Immutability is a pattern which is suit well parallel programming, but you have to be aware of a potential memory pressure risk when it's not implemented right or used wisely. this post will cover a new BCL library (still in its preview stage) which is targeting immutable collections. .NET is already having Concurrent implementation for Queue, Stack, Bug and Dictionary, which is thread-safe, but other type of collection like List is missing. another type of collection are read only collection, but those type...

MEF 2.0 – mini series: part 8 (Composition options and exception handling)

Saturday, February 16, 2013

MEF 2.0 - mini series: part 8 (Composition options and exception handling) this is the last post in the MEF 2.0 mini series. you can see other posts of this series in here. this post will wrap-up the series with a quick survey to to the to some changes made for the underline composition process. Exception one of the most painful experience of MEF 1 was its misleading exception's description. some time it was really hard to figure out the exception roots.  you can read more about MEF...

MEF 2.0 – mini series: Part 7 (Catalog filter and Deep hierarchic scoping)

Thursday, January 24, 2013

MEF 2.0 - mini series: Part 7 (Catalog filter and Deep hierarchic scoping) this is the 7th post in the MEF 2.0 mini series. you can see the following TOC for other posts in this series. in the previous post I was talking about composition scoping and lifetime management. on this one, I will extend the composition scoping topic toward hierarchic along with catalog filtering capability. hierarchic scoping is not trivial, you must understand the hierarchic behavior and what it was design for. MEF hierarchic...

MEF 2.0 – mini series: part 6 (Composition scoping and lifetime management)

Wednesday, January 16, 2013

MEF 2.0 - mini series: part 6 (Composition scoping and lifetime management) this is the 6th post in the MEF 2.0 mini series. you can see the following TOC for other posts in this series. in this post I will cover a new concept of scoping and part lifetime management, which is a great improvement over MEF 1. MEF 1 was coming with a fairly naïve lifetime management. part's lifetime could be either shared or non-shared (you could also apply 'any' but eventually 'any'...

MEF 2.0 – mini series: part 5 (Fluent export properties)

Tuesday, January 15, 2013

MEF 2.0 - mini series: part 5 (Fluent export properties) this is the 5th post in the MEF 2.0 mini series. you can see the following TOC for other posts in this series. in this post I will cover the fluent property's export. Exporting properties is a less known feature of MEF. MEF 1 was supporting this feature by using the attribute model. you could decorate a property with a attribute and then it become available for imports. the following...

MEF 2.0 TOC

Sunday, January 6, 2013

Portable MEF (Microsoft.Composition) Part1: Attribute Model Part2: Convention Part 3: Dependency Injection vs. Service Locator Part 4: Microsoft.Composition (Portable MEF): Scoping   MEF 2.0 (Full Version) TOC MEF 2.0 is a reflection of a community requests. features like Open Generics, fluent and conventional discovery, lifetime handling of the part, better exception handling and more, was all requested by the community. part 1: Open Generics Part 2: Fluent and Conventional Export Part 3: Fluent import constructor Part 4: Fluent import Part 5: Fluent export properties. Part 6: Composition scoping and lifetime management ...

MEF – Best Practice

Wednesday, July 27, 2011

MEF - Best Practice In this post I will offer MEF practice that may ease your MEF life. one of the MEF headache is to understand what's goes wrong, when MEF reject the composition, you can read more about MEF diagnostic in this post.  Most of the obscure loading failure happens when your Export dependencies doesn't satisfied. in those case you solely relay on the MEF error message which is not enough in cases of deep dependencies graph. It will normally occurs when you...
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SDP – MEF (Real-Life patterns)

Friday, March 18, 2011

SDP - MEF (Real-Life patterns) On the last day of the SDP at Crown Plaza Hotel, Tel Aviv. I was lecturing about Real-Life scenario of MEF failures. the lecture was focusing on diagnostic ,solutions and testing. I want to thanks all attendant's, It was the after lunch session and you were bravely kept your eyes open.   the presentation pdf can be found here.   you can use the following check-list as recommended diagnostic process.   Diagnostic Check-List Is the instance included...

Exporting non Exportable types

Saturday, October 30, 2010

Exporting non Exportable types this post extend Glenn Block's post about "Poco, Mef, and custom type systems. Are you ready to take the red pill?"  the post is adding a compile time attribute export model, Directory catalog and migrate Glenn code to VS 2010. It is very recommended to read Glenn Block's post before reading this one.   the code sample for this post can be download from here.   Summarizing Glenn's post in general Glenn show how to add attributes (like Export) to...