Extension points in Enterprise Application
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@RaduVunvulea Extension Points in Enterprise . Applications
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Extension points in Enterprise Application, ITDays Cluj-Napoca,
Transcript of Extension points in Enterprise Application
@RaduVunvulea
Extension Points in Enterprise . Applications
{“name” : “Radu Vunvulea,“company” : “iQuest Group”,“userType” : “enthusiastic”“technologies” : [“Azure”, “.NET”, “JS”, “Web”, “Mobile”, “WPF”, “SL” ],“expertise” : [“enterprise”, “pharma”, “automotive”, “home automation”, “e-Commerce” ],“blog” : “vunvulearadu.blogspot.com”,“email” : ”[email protected]”,“socialMedia” :
{“twitter” : “@RaduVunvulea”,
“fb” : “radu.vunvulea”}
}
Who am I?
AgendaWhat are Extension PointsFeatures & IdealEvolutionComponentsService Provider InterfaceWho should implement themCommon Extension PointsConclusion
What are Extension Points
What are Extensions Point?
What are Extensions Point?
What are Extensions Point?• Allows other users to extend the
functionality of the application• Avoid tight coupling between
components• Allow other plugins/components to
customize or extend portions of the functionality
• Define a contract between the two parts
Features & Ideal
Features• Component does not know anything
about other components beyond the scope of the extension contract
• Applications can have more than one component that extend a specific extension point
Ideal• Easy to learn• Support multiple scenarios • Evolve without breaking
existing implementation• Powerful enough to exist more
than one iteration
Evolution
How should evolve• Natural• Based on the needs• Every iteration• At design time
Evolutionpublic class Calculator{
private string baseValue;...public void Add(string value){
if (value==null || value.Count == 0|| value == "-")
{baseValue = baseValue + "-";
}...
}}
Evolutionpublic class Calculator{
private string baseValue;...public void Add(string value){
if (ContainsDefaultValue(value)){
baseValue = baseValue + "-";}...
}
protected virtual bool ContainsDefaultValue(string value){
return (value==null || value.Count == 0|| value == "-");
}}
How should evolve
NaturalBased on the needs
Every iteratio
n
At design time
Simple Complex
Components
Interfaces
Virtual Methods
Abstract Class
Modules
Services
Configuration Files
…it’s a combination between them…
…no perfect solution…
Interfaces Virtual Methods
Abstract Class Modules
Services Configuration Files
Service Provider Interface
Service Provider Interface (SPI)Contains• Interfaces• Abstract ClassesOptional interfacesAnnotations (attributes)
Interfacespublic class MyCalculator : ICalculator{
public void Add(string value)
{// Some action
}
void Initialize(){
// Some action
}
void Refresh() {}
}
public interface ICalculator{
void Add(string value);
void Initialize();void Refresh();
}
Annotation[InitializeAttribute(typeof(MyInitialize)]public class MyCalculator : ICalculator{
public void Add(string value)
{...
}
void Initialize()void Refresh()
}
public interface ICalculator{
void Add(string value);
void Initialize();void Refresh();
}
Who should implement
Extension Points
External Teams
Print EP
Print EP
Internal Teams
View EP
Core
Core Team
Print EP
Common Extension Points
Common Extension Points
• Manager• Expiration
Policy• Encryption• Backing Store
Caching
• Provider• CRUD• Retry Policy
Data Access
• Hash Algorithm
• Symmetric Encryption
Cryptography
Common Extension Points• Validator
• Attributes• Handing
Validation
• Formatter• Listeners• Filters
Logging
• Handler• Formatter• Management
Exception
• Authorization
• Authentication
• Security CacheSecurity
Conclusion
Helper FrameworksEnterprise Library (.NET)Java Plugin Framework (Java)Qt Project (C++)BIRT Extension Point (Java BI)
ChangesBe prepared for changes• Frameworks• Services• Hardware• On-premise to Cloud• Cloud to On-premise
Question
Answers
Thank you{ “name” : “Radu Vunvulea, “blog” : “vunvulearadu.blogspot.com”, “email” : ”[email protected]”, “socialMedia” : {
“twitter” : “@RaduVunvulea”,“fb” : “radu.vunvulea”
}}
