3.1 Explore extensions and the extension framework in F&O apps

Question 1

Why can’t MS models be modified/overlayered?

Answer 1

To reduce build time and ensure that you’re always running the latest version of F&O apps

Question 2

How are F&O apps customized?

Answer 2

Through the use of extensions, which allow you to add functionality to model elements and source code in AOT using VS

Question 3

What to do if customization can’t be completed using extensions?

Answer 3

Submit an extensibility request support ticket

Question 4

Why should overlayering be used with caution?

Answer 4

While it can take less time to modify base code, you could end up spending much more time later fixing code after an update or a hotfix is rolled out to the application

Question 5

Why create extension models?

Answer 5

Simplify and improve the performance of builds, test automation, deployments, and delivery to customers

Question 6

Common element types used in extensions?

Answer 6

Labels
Enums
EDTs
Tables
Data entities
Forms
Menus

Question 7

Why extend labels?

Answer 7

Modify the values of label, add new labels, or add new languages

Question 8

Why extend enums?

Answer 8

If “IsExtensible” property is true, enum can be extended to add new values to it

Question 9

Why extend EDTs?

Answer 9

Modify properties for an EDT, such as label, string size, or help text

Question 10

Why extend tables?

Answer 10

To add new fields, indexes, or relations, modify properties.
Implement event handlers

Question 11

Why extend data entities?

Answer 11

Provide a de-normalized version of underlying table schemas

Question 12

Why extend forms?

Answer 12

To add a new data source, add new control, modify properties, also implement event handlers

Question 13

Why extend menus?

Answer 13

To add new menu items, submenus, menu references, hide any of the items

Question 14

One of main obstacles that could increase the continuous upgrade costs?

Answer 14

Intrusive customizations

Question 15

Guidelines to follow to ensure customization is not intrusive?

Answer 15

Type should not be changed
Model’s author should remain in control of encapsulated code and types
Adding new behaviors is encouraged and is enabled by using extensions

Question 16

Event handler?

Answer 16

A way to write or copy code to an element that runs when certain event occurs, such as field being modified

Question 17

What is CoC?

Answer 17

Chain of Command

Question 18

Chain of Command?

Answer 18

Is a design pattern where a request is handled by a series of receivers

Question 19

Restrictions when wrapping methods?

Answer 19

Wrapper method must have the same signature as the base method
Only root-level methods can be wrapped

Question 20

What method must be called within a method to ensure CoC?

Answer 20

next()

Question 21

Several ways to run-time consuming operations?

Answer 21

Batch processes
Run Async to avoid AOS disconnect and freezes
SysOperationSandbox framework which will implement the long running process in separate session in async mode

Question 22

SysOperationSandbox?

Answer 22

Run sync operation on the async session that is happening on the web client.
Runs two client sessions in parallel

Question 23

SysOperationSanbox client session one purpose?

Answer 23

Async session that runs the business logic in static class

Question 24

SysOperationSanbox client session two purpose?

Answer 24

Communicates with the UI to keep it live without allowing a timeout.