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LLDsystem_design~12 mins

Builder pattern in LLD - Architecture Diagram

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System Overview - Builder pattern

The Builder pattern helps create complex objects step-by-step. It separates the construction process from the final object, allowing different representations using the same building steps.

This pattern is useful when an object needs many parts or configurations, making the creation process clear and flexible.

Architecture Diagram
User
  |
  v
Builder Interface <---- Concrete Builder
  |                      |
  v                      v
Director --------------> Product
Components
User
client
Starts the building process by interacting with the Director or Builder.
Director
controller
Controls the building steps sequence using the Builder interface.
Builder Interface
interface
Defines methods to build parts of the product.
Concrete Builder
service
Implements Builder interface to construct and assemble parts of the product.
Product
data_object
The complex object being built step-by-step.
Request Flow - 5 Hops
User → Director
Director → Builder Interface
Builder Interface → Concrete Builder
Concrete Builder → Product
Director → User
Failure Scenario
Component Fails:Concrete Builder
Impact:Product construction fails or produces incomplete/incorrect product.
Mitigation:Use error handling in builder methods; fallback to default builder or notify user of failure.
Architecture Quiz - 3 Questions
Test your understanding
Which component controls the sequence of building steps in the Builder pattern?
ADirector
BUser
CProduct
DConcrete Builder
Design Principle
The Builder pattern separates the construction of a complex object from its representation. This allows the same construction process to create different products, improving flexibility and clarity in object creation.