32 lines
1.6 KiB
Markdown
32 lines
1.6 KiB
Markdown
# Chain of Responsibility Design Pattern — Java Example
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**Pattern:** Behavioral → Chain of Responsibility
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**Article:** https://ankurm.com/chain-of-responsibility-design-pattern-java/
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## What this example shows
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A support-ticket routing system: four handlers (`Level1Support`, `Level2Support`, `Level3Support`, `CriticalIncidentTeam`) are chained together via `SupportHandler.setNext()`. Each handler checks `canHandle()` for the ticket's priority — if it can't handle the ticket, it logs that it's passing the ticket up and delegates to the next handler in the chain. The sender (`Main`) only ever talks to the first handler; it has no idea which handler will ultimately resolve each ticket.
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## How to run
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```bash
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javac chain-of-responsibility/*.java -d out/chain
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java -cp out/chain chain.Main
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```
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Requires Java 25.
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## Post Section ↔ File Mapping
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| Post Section | File(s) |
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|---|---|
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| The Problem: Rigid Routing Logic | illustrative only — not part of this repository's runnable example |
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| Implementation: Support Ticket Escalation — base handler | `SupportHandler.java` |
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| Implementation: Support Ticket Escalation — the ticket | `SupportTicket.java` |
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| Each concrete handler checks only its own responsibility — Level 1 & 2 | `Level1Support.java`, `Level2Support.java` |
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| Level3Support and CriticalIncidentTeam follow exactly the same shape | `Level3Support.java`, `CriticalIncidentTeam.java` |
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| The chain is assembled in one place | `Main.java` |
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Article: https://ankurm.com/chain-of-responsibility-design-pattern-java/
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All patterns: https://ankurm.com/design-patterns-java/
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