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LLDsystem_design~12 mins

Interpreter pattern in LLD - Architecture Diagram

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System Overview - Interpreter pattern

The Interpreter pattern is a design pattern used to evaluate sentences in a language. It defines a way to represent grammar rules and interpret expressions in a structured way. This system allows easy extension and modification of the language rules.

Architecture Diagram
          +----------------+
          |     Client     |
          +--------+-------+
                   |
                   v
          +--------+-------+
          |   Context      |
          +--------+-------+
                   |
                   v
    +--------------+--------------+
    |         AbstractExpression  |
    +--------------+--------------+
                   |
       +-----------+-----------+
       |                       |
+------+-------+       +-------+-------+
| TerminalExpression  |       | NonTerminalExpression |
+--------------+       +---------------+
Components
Client
client
Initiates the interpretation process by providing the expression and context.
Context
context
Holds global information required during interpretation.
AbstractExpression
abstract_class
Defines the interface for interpreting expressions.
TerminalExpression
expression
Represents the basic elements of the grammar that do not contain other expressions.
NonTerminalExpression
expression
Represents complex grammar rules composed of other expressions.
Request Flow - 5 Hops
Client → Context
Client → AbstractExpression
AbstractExpression → TerminalExpression / NonTerminalExpression
TerminalExpression / NonTerminalExpression → Context
AbstractExpression → Client
Failure Scenario
Component Fails:Context
Impact:If the context is corrupted or missing data, interpretation results will be incorrect or fail.
Mitigation:Validate context data before interpretation; use default values or error handling in expressions.
Architecture Quiz - 3 Questions
Test your understanding
Which component holds the global information needed during interpretation?
ATerminalExpression
BContext
CClient
DAbstractExpression
Design Principle
The Interpreter pattern uses a tree-like structure of expressions to represent grammar rules. It separates the grammar from the interpretation logic, allowing easy extension and reuse of language rules.