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Questions and Answers
Which class serves as the base for all handlers in the given implementation?
Which class serves as the base for all handlers in the given implementation?
- HandlerBase (correct)
- IHandler
- GetCart
- ApplyPromotion
What must be specified in the ShowTaxAndShippingForBuyer3 class to associate it with a handler chain?
What must be specified in the ShowTaxAndShippingForBuyer3 class to associate it with a handler chain?
- When to execute the handler
- Result type as GetCartResult and Parameter type as GetCartParameter (correct)
- A method for handling errors
- The constructor of the class
What attribute must be used to decorate the new handler class?
What attribute must be used to decorate the new handler class?
- ServiceLocator
- HandlerMapping
- HandlerChain
- DependencyName (correct)
What type of methods does the HandlerBase class provide to facilitate error handling?
What type of methods does the HandlerBase class provide to facilitate error handling?
Which of the following is a mandatory prerequisite before adding a new handler?
Which of the following is a mandatory prerequisite before adding a new handler?
What does the last configuration for the new handler require in relation to the dependency locator?
What does the last configuration for the new handler require in relation to the dependency locator?
In the implementation, which positions the new handler within a specified chain?
In the implementation, which positions the new handler within a specified chain?
What should be specified for the 'Order' property in the new handler class?
What should be specified for the 'Order' property in the new handler class?
What is the primary requirement for a handler to be used within a handler chain?
What is the primary requirement for a handler to be used within a handler chain?
How does the Order property affect the execution of handlers in a chain?
How does the Order property affect the execution of handlers in a chain?
What is the default starting order for all handler chains?
What is the default starting order for all handler chains?
What value must the 'Order Management > Cart > Show Tax & Shipping Amount in Cart' setting be set to in order for the specific handler logic to function?
What value must the 'Order Management > Cart > Show Tax & Shipping Amount in Cart' setting be set to in order for the specific handler logic to function?
What must be specified in the Execute method of a handler?
What must be specified in the Execute method of a handler?
What is the default order value for handlers within a handler chain?
What is the default order value for handlers within a handler chain?
What happens if the result's cart is null within the Execute method?
What happens if the result's cart is null within the Execute method?
What is the purpose of the 'result.ShowTaxAndShipping' assignment in the Execute method?
What is the purpose of the 'result.ShowTaxAndShipping' assignment in the Execute method?
Which order value would allow a handler to be inserted into the second position of a handler chain?
Which order value would allow a handler to be inserted into the second position of a handler chain?
What does returning 'result' from the Execute method do?
What does returning 'result' from the Execute method do?
What determines the association of a handler with a handler chain?
What determines the association of a handler with a handler chain?
In the handler class definition, what does the method 'Execute' return if it processes correctly?
In the handler class definition, what does the method 'Execute' return if it processes correctly?
How are additional handlers typically ordered in a handler chain?
How are additional handlers typically ordered in a handler chain?
What must be true for handlers to execute in the same handler chain?
What must be true for handlers to execute in the same handler chain?
What is the Order property value in the ShowTaxAndShippingForBuyer3 handler class?
What is the Order property value in the ShowTaxAndShippingForBuyer3 handler class?
Which method is responsible for continuing the handler chain to the next handler?
Which method is responsible for continuing the handler chain to the next handler?
What is the role of handlers in Optimizely Configured Commerce?
What is the role of handlers in Optimizely Configured Commerce?
How can a developer remove or replace a handler in the Configured Commerce platform?
How can a developer remove or replace a handler in the Configured Commerce platform?
What happens when a handler chain is executed?
What happens when a handler chain is executed?
What is one way to create a custom handler in Configured Commerce?
What is one way to create a custom handler in Configured Commerce?
Which of the following chains is specifically mentioned for cart-related operations?
Which of the following chains is specifically mentioned for cart-related operations?
Why can't a handler be completely removed from Configured Commerce?
Why can't a handler be completely removed from Configured Commerce?
When is the GetCartHandler chain typically executed?
When is the GetCartHandler chain typically executed?
What are module handlers primarily used for in the Configured Commerce platform?
What are module handlers primarily used for in the Configured Commerce platform?
Flashcards
Handler
Handler
An object that processes business logic in Optimizely Configured Commerce, part of a handler chain.
Handler Chain
Handler Chain
A sequence of handlers executed in a specific order.
GetCartHandler chain
GetCartHandler chain
Retrieves the cart, cart lines, shipping data, taxes and carriers for the logged-in user.
GetProductHandler chain
GetProductHandler chain
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IHandler interface
IHandler interface
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Execute method
Execute method
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Order property
Order property
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DependencyName attribute
DependencyName attribute
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HandlerBase class
HandlerBase class
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TIn/TOut
TIn/TOut
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Handler chain order
Handler chain order
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Default handler order
Default handler order
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Adding a handler
Adding a handler
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Replacing a handler
Replacing a handler
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handler chain execution
handler chain execution
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Study Notes
Handlers
- Handlers are objects that process business logic in Optimizely Configured Commerce.
- They are part of handler chains, which are executed in a specific order.
- Each handler in the chain is executed until no more handlers are available.
- Example handler chains:
- GetCartHandler chain: Retrieves the cart object for the currently authenticated user.
- It also gets cart-related data like lines, shipping costs, taxes, and carriers..
- GetProductHandler chain: Retrieves a product given a product identifier.
- GetCartHandler chain: Retrieves the cart object for the currently authenticated user.
Adding Handlers
- To add a new handler to an existing handler chain, the handler must:
- Implement the
IHandlerinterface. - Be decorated with the
DependencyNameattribute. - Return a result from the
Executemethod. - Specify an order via the
Orderproperty.
- Implement the
- The
IHandlerinterface requires the handler to implement theExecutemethod, specify handler order using theOrderproperty, and associate the handler with a handler chain. - The
Executemethod is the sole entry point into a handler and contains the business logic. - The
Orderproperty determines the order of the handler within the chain.- Handlers are ordered in ascending order.
- By default, all handler chains have at least one handler with an order value of 500.
- Additional handlers usually increment the order by 100.
- A handler is associated with a handler chain based on the parameter and result object types (
TInandTOut).
Handler Implementation Example
- Handler classes can inherit from the
HandlerBaseclass, which implements theIHandlerinterface and provides utility methods for returning error results and passing execution to the next handler. - All handlers should inherit from the
HandlerBaseclass as a best practice. - The
DependencyNameattribute allows the handler to be retrieved by name via the dependency locator. - The
Orderproperty specifies the order in which the handler will be executed within the handler chain. - The
Executemethod can either continue the handler chain or break it.- Returning
this.NextHandler.Execute(unitOfWork, parameter, result)continues the chain. - Returning
resultbreaks the chain.
- Returning
Removing or Replacing Handlers
- In Configured Commerce 4.0, handlers are the primary extension point for adding business logic and providing additional data.
- To remove or replace a handler, give it the same dependency name as an existing handler and implement a custom class that derives from
HandlerBase. - The custom class will override the standard Configured Commerce handler.
- This approach avoids the need to use the
Orderproperty since the custom class replaces the existing handler. - You cannot directly remove a handler, but you can create an implementation that does nothing.
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Description
This quiz covers the concept of handlers in Optimizely Configured Commerce, focusing on their role in processing business logic and the execution sequence of handler chains. It also explains how to add new handlers to existing chains by implementing the IHandler interface and using specific attributes.
