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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...
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 1...
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) 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' will be created...
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 [Export] attribute and then it become available for imports. the following code demonstrate property exporting in MEF...
MEF 2.0 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 Part 7: Catalog filter and Deep hierarchic scoping. Part 8: Composition...
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 are...
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 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...
Testing and Debugging MEF , avoiding misconceptions - Part 3 this is the 3rd post of this series and it will discuss common misconceptions which may lead unexpected behavior and long debugging nights. Initialization issues the first misconception occurs when developer are trying to access imported property at construction time. NullReferenceException [ Export ] public class MyPlugin { public MyPlugin() { // the logger import doesn't satisfied yet // the next line will result with NullReferenceException...
Testing and Debugging MEF, Tips - Part 2 this is the second post of a series that will offer some tips about testing and debugging your MEF -able component and application. in this post we will focus about debugging the most common, and most confusing, MEF failure . Assembly Loading Failure the most common MEF runtime failure occurs because of missing assembly which contain the MEF parts (Import, Export) or the parts dependencies (like 3rd party components). under the hood MEF...
Testing and Debugging MEF, Tips - Part 1 this is the first post of a series that will offer some tips about testing and debugging your MEF -able component and application. in this post we will focus about exporting Mock objects. the code sample for this post can be download from here . Prerequisite if you are not familiar with Mocks you better read more about this subject before proceeding with this post (in short Mocks are fake object which is use for separate dependencies during...
if you want to learn more about MEF backstage you can find more information under the following post: MEF: What and why http://blogs.msdn.com/b/hammett/archive/2010/05/29/mef-what-and-why.aspx
MEF for Beginner (Deployment Catalog) - part 12 this is the 12th post of the MEF for Beginner series, the series TOC is available here . this post will focus on Deployment Catalog . the code sample for this post can be found here . What is MEF Deployment Catalogs? the deployment catalog is actually a redesign of the older package catalog . it enable to load parts from xap packages a-synchronically. Code sample the following code sample depend on 2 assembly that...
MEF for Beginner (Import from Xaml) - part 11 this is the 11th post of the MEF for Beginner series, the series TOC is available here . this post will focus on Importing mef parts directly from the Xaml . the code sample for this post is available here . assuming that we have the following exports : Code Snippet class DemoStrings { [ Export ( "MyTag" )] public string Text1 { get { return "Hello world" ; } } ...
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