2023 beta - APIs & Extensions (20%)

Question 1

How do you add a new handler to a handler chain?

Answer 1

• Implement the IHandler<TIn, TOut> interface
• Be decorated with the DependencyName attribute
• Return a result from the “Execute” method
• Specify an order via the “Order” property

Question 2

How do you add a new pipe to an existing pipeline?

Answer 2

• Implement the IPipe<TIn, TOut> interface
• Return a result from the “Execute” method
• Specify an order via the “Order” property

Question 3

How do you break a handler chain?

Answer 3

return result;

Question 4

How do you call the next handler of a handler chain?

Answer 4

return this.NextHandler.Execute(unitOfWork, parameter, result);

Question 5

How do you return an error code, a subcode, a message, and exit a pipe?

Answer 5

result.ResultCode = ResultCode.Error;
result.SubCode = SubCode.NotFound;
result.Messages.Add(new ResultMessage { Message = “A customer is required to format the label.” });
return result;

Question 6

What do you need to do to exit a pipe without specifying an error code?

Answer 6

result.ExitPipeline = true;
return result;

Question 7

How do you replace an existing pipe?

Answer 7

-Implement the IPipe<TIn, TOut> interface
- Return a result from the “Execute” method
- Specify an order via the “Order” property (The order does not necessarily need to be the same as the standard pipe)
- Be named the same as the pipe being replaced (this is a new requirement)

Question 8

How do you stop the execution of a pipeline?

Answer 8

The pipe must either assign an error code to the result object or set the exit flag on the result object.

Question 9

How do you use a pipeline in code?

Answer 9

Have an instance injected into the class constructor like most other objects.

Question 10

On what is a persona built on?

Answer 10

A persona is built on the user and customer characteristics that you add to a persona rule

Question 11

What is the RuleManager?

Answer 11

RuleManager is the container class that is attached to Entities to allow that Entity to have a RulesEngine

Question 12

What is the purpose of RuleClause?

Answer 12

RuleClause defines the actual rules to be run and the Condition, Grouping, and Order in which they run

Question 13

What are the rule types?

Answer 13

Persona
Category
Shipping
Promotion
Page Variants
Restriction Groups

Question 14

What is the purpose of RuleTypeOption?

Answer 14

RuleTypeOption defines the rules that are available when adding a RuleClause. (These options define the “IF” statement of the rule).

Question 15

Which class is the base class for all criteria types?

Answer 15

CriteriaTypeBase

Question 16

Which method is called to indicate whether a rule passes or fails?

Answer 16

The Validate method is called returning true to indicate whether the rule passes or false if the rule fails.

Question 17

What are the main actions of the ValidateRule method?

Answer 17

Validates one of the rule clauses by calling the appropriate CriteriaType’s implementation of the validate method.
Retrieves the valid ICriteriaType object using the CriteriaTyepFactory.
The enumerable context is then interrogated to find a context object with a type that matches the object type required for the current RuleClause.
If no context is found then the RuleClause is validated without any context.

Question 18

What are the 2 ways to break a handler chain?

Answer 18

Breaking the handler chain can be done one of two ways:

By returning the result instead of calling this.NextHandler.Execute()

By setting the next handler to be a NullHandler
For example, this.RegisterNext(new NullHandler(TParameter, TResult>())