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In implementing the Chain of Responsibility pattern, how is the linkage between handlers usually established?

easy🧠 Conceptual Q2 of 15
LLD - Behavioral Design Patterns — Part 1
In implementing the Chain of Responsibility pattern, how is the linkage between handlers usually established?
AHandlers are linked by inheriting from a common superclass without references.
BHandlers communicate through a global event bus without direct references.
CEach handler holds a reference to the next handler in the chain.
DHandlers are connected by passing requests through a static utility method.
Step-by-Step Solution
Solution:

  1. Step 1: Recall the pattern structure

    In the Chain of Responsibility, each handler typically maintains a reference to the next handler to forward requests.

  2. Step 2: Evaluate options

    Each handler holds a reference to the next handler in the chain. correctly describes this linkage. Handlers communicate through a global event bus without direct references. describes an event-driven approach, not the classic pattern. Handlers are linked by inheriting from a common superclass without references. mentions inheritance but lacks linkage. Handlers are connected by passing requests through a static utility method. suggests a static method, which is not typical.

  3. Final Answer:

    Each handler holds a reference to the next handler in the chain. -> Option C

  4. Quick Check:

    Handler references next handler directly [OK]
Quick Trick: Handlers hold next handler reference to forward requests [OK]
Common Mistakes:
MISTAKES
  • Confusing event-driven communication with direct linkage
  • Assuming inheritance alone links handlers

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