Analysis
Compare patterns
Evaluate design patterns side by side across intent, tradeoffs, languages, and integration fit.
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Analysis
Pattern comparison
Reviewing 3 patterns.
| Criteria | |||
|---|---|---|---|
| Basics | |||
| Category | behavioral | structural | behavioral |
| Summary | Pass a request through a sequence of handlers until one handles it or the chain ends. | Compose objects into tree structures to represent part-whole hierarchies and let clients work with individual and composite objects through the same interface. | — |
| Intent | Pass requests along a chain of handlers until one of them handles the request or the request reaches the end of the chain. | Compose objects into tree structures to represent part-whole hierarchies and let clients work with individual and composite objects through the same interface. | Separate an algorithm from the object structure it operates on by moving behavior into visitor objects. |
| Decision factors | |||
| Problem | A request must pass through multiple possible handlers, but the sender should not need to know which handler will process it. | A system needs to treat individual objects and groups of objects uniformly, but the hierarchy becomes difficult to manage with separate code paths. | You need to perform operations across a set of different object types without stuffing all the logic into the objects themselves. |
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| Integration notes | Chain of Responsibility is useful for validation pipelines, support routing, approval flows, and any system where requests may be processed by different handlers in sequence. | Composite is useful when a hierarchy of nested objects should expose a common interface, such as files and folders, menus and submenus, org charts, widget trees, or scene graphs. | Visitor is useful for AST processing, reporting, cart calculations, and exporting object structures to alternate formats. |