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DF15 - Dynamic Apex Binding with design patterns

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Fronde Systems Group
Fronde Systems Group

ºÝºÝߣs from Dreamforce 2015 session Join us as we teach you how to create a set of versioned RESTful APIs by utilizing custom-settings and advanced Apex features such as Type and Schema. Via dynamic binding, the custom-APIs support multiple versions simultaneously, allowing a new version to be deployed without affecting existing API consumers. You will learn about how to use these advanced features in Apex. code is available on https://github.com/erichpleung/dynamic-apex

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Dynamic Apex Binding Eric Leung Salesforce Solution Architect eric.leung@fronde.com @erichpleung With Design Patterns Ben Naylor Senior Salesforce Technical Consultant ben.naylor@fronde.com @nzchicken
Australia New Zealand Auckland Wellington Sydney Melbourne
8 Years Salesforce Partnership 5 Locations Wellington, Auckland, Sydney, Melbourne, Manila 400+ Customers 23 Years Experience in IT Solutions Google Enterprise Partner of the Year 2012, Australia and New Zealand Amazon Advanced Consulting Partner & Channel Reseller Partner 300+ Hobbits/Roos Salesforce Platinum Partner www.fronde.com
Key Capabilities Offered by Fronde
Agenda Part 1: Design Patterns ? Factory and Proxy Patterns Part 2: Custom Settings and Schema Namespace Part 3: Dynamic Binding
What are Design Patterns? Object Oriented Software Design Commonly used in Object Oriented Languages ? Apex, Java, C#, Objective C Reusable Solution Templates ? Not libraries 3 categories (from GoF) ? Creational ¨C object creation ? Structural ¨C relationships between objects ? Behavioural ¨C communication between objects
Creational Logic isolation Centralize object creation logic ? Interface ? Class hierarchy Factory Pattern
Structural On behalf of the real object ? Hide details ? Optimization ? House keeping tasks Proxy Pattern
Combine Proxy and Factory Patterns
Demo 1
Custom Settings Custom Settings Thin object Promotes testingNo need to query Configurable in real time
Store KVP Application/Code Settings List/Map containers .getAll() List vs. Hierarchy Custom Settings User/Profile based Global setting One set of results .getInstance() List Type Hierarchy Type
Key Benefits Manage change quickly Configuration > Customization Feature Toggles Code Reuse
Schema Namespace Runtime metadata query Useful for Dynamic Apex Get object configuration information Special accessor methods
Demo 2
What is Dynamic Binding? Compile-time vs Runtime Tightly coupled vs. Loosely coupled Classes vs. Interfaces Types vs. Objects
System.Type Class System.Type.forName(className: String) Default constructor Type casting, can be interface Dependency Injection public interface Animal {...} public class Cat implements Animal { public Cat(){¡­}// default constructor } System.Type sType = System.Type.forName('Cat'); // using apex-class name to get aType Animal animal = (Animal) sType.newInstance(); // instantiate and cast to an interface
Back to the first demo¡­ Boilerplate code Not easy to add a new version ? New code: service, & implementation classes ? Need to update permissions on new classes Testing predefined scenarios ? Testing compile time logic Problems Changes Using custom settings to provide implementation details Using System.Type to instantiate implementation Using classes in Schema namespaces to create and query Salesforce objects Testing runtime behaviour ? Setup test configuration
Demo 3
Summary Dynamic Binding using Apex ? Runtime, Interfaces, Loosely Coupled Custom Settings ? Hierarchical and List Advance Apex Features ? System.Type and SObject classes ? Schema Namespace
Summary continues Testing ? Interface driven ? Test classes can be used in custom setting ? Testing new scenarios Other examples on using dynamic binding ? Fine grain security ? Extends Salesforce OOTB functions/features ? Trigger
References Books: ? Design Patterns: Elements of Reusable Object-Oriented Software, Addison-Wesley ? Head First Design Patterns, O¡¯Reilly Links: ? Apex Design Patterns, Salesforce https://developer.salesforce.com/page/Apex_Design_Patterns ? Force.com Apex Code Developer's Guide https://developer.salesforce.com/docs/atlas.en- us.apexcode.meta/apexcode/
Q & A
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DF15 - Dynamic Apex Binding with design patterns

  • 1. Dynamic Apex Binding Eric Leung Salesforce Solution Architect eric.leung@fronde.com @erichpleung With Design Patterns Ben Naylor Senior Salesforce Technical Consultant ben.naylor@fronde.com @nzchicken
  • 3. 8 Years Salesforce Partnership 5 Locations Wellington, Auckland, Sydney, Melbourne, Manila 400+ Customers 23 Years Experience in IT Solutions Google Enterprise Partner of the Year 2012, Australia and New Zealand Amazon Advanced Consulting Partner & Channel Reseller Partner 300+ Hobbits/Roos Salesforce Platinum Partner www.fronde.com
  • 5. Agenda Part 1: Design Patterns ? Factory and Proxy Patterns Part 2: Custom Settings and Schema Namespace Part 3: Dynamic Binding
  • 6. What are Design Patterns? Object Oriented Software Design Commonly used in Object Oriented Languages ? Apex, Java, C#, Objective C Reusable Solution Templates ? Not libraries 3 categories (from GoF) ? Creational ¨C object creation ? Structural ¨C relationships between objects ? Behavioural ¨C communication between objects
  • 7. Creational Logic isolation Centralize object creation logic ? Interface ? Class hierarchy Factory Pattern
  • 8. Structural On behalf of the real object ? Hide details ? Optimization ? House keeping tasks Proxy Pattern
  • 9. Combine Proxy and Factory Patterns
  • 11. Custom Settings Custom Settings Thin object Promotes testingNo need to query Configurable in real time
  • 12. Store KVP Application/Code Settings List/Map containers .getAll() List vs. Hierarchy Custom Settings User/Profile based Global setting One set of results .getInstance() List Type Hierarchy Type
  • 13. Key Benefits Manage change quickly Configuration > Customization Feature Toggles Code Reuse
  • 14. Schema Namespace Runtime metadata query Useful for Dynamic Apex Get object configuration information Special accessor methods
  • 16. What is Dynamic Binding? Compile-time vs Runtime Tightly coupled vs. Loosely coupled Classes vs. Interfaces Types vs. Objects
  • 17. System.Type Class System.Type.forName(className: String) Default constructor Type casting, can be interface Dependency Injection public interface Animal {...} public class Cat implements Animal { public Cat(){¡­}// default constructor } System.Type sType = System.Type.forName('Cat'); // using apex-class name to get aType Animal animal = (Animal) sType.newInstance(); // instantiate and cast to an interface
  • 18. Back to the first demo¡­ Boilerplate code Not easy to add a new version ? New code: service, & implementation classes ? Need to update permissions on new classes Testing predefined scenarios ? Testing compile time logic Problems Changes Using custom settings to provide implementation details Using System.Type to instantiate implementation Using classes in Schema namespaces to create and query Salesforce objects Testing runtime behaviour ? Setup test configuration
  • 20. Summary Dynamic Binding using Apex ? Runtime, Interfaces, Loosely Coupled Custom Settings ? Hierarchical and List Advance Apex Features ? System.Type and SObject classes ? Schema Namespace
  • 21. Summary continues Testing ? Interface driven ? Test classes can be used in custom setting ? Testing new scenarios Other examples on using dynamic binding ? Fine grain security ? Extends Salesforce OOTB functions/features ? Trigger
  • 22. References Books: ? Design Patterns: Elements of Reusable Object-Oriented Software, Addison-Wesley ? Head First Design Patterns, O¡¯Reilly Links: ? Apex Design Patterns, Salesforce https://developer.salesforce.com/page/Apex_Design_Patterns ? Force.com Apex Code Developer's Guide https://developer.salesforce.com/docs/atlas.en- us.apexcode.meta/apexcode/
  • 23. Q & A