Analysis
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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 | creational | behavioral | behavioral |
| Summary | Construct a complex object step by step so the same construction process can create different representations. | Pass a request through a sequence of handlers until one handles it or the chain ends. | Encapsulate a request as an object so it can be invoked, queued, logged, or undone independently of the receiver that performs the work. |
| Intent | Separate the construction of a complex object from its final representation. | Pass requests along a chain of handlers until one of them handles the request or the request reaches the end of the chain. | Encapsulate a request as an object so it can be invoked, queued, logged, or undone independently of the receiver that performs the work. |
| Decision factors | |||
| Problem | Constructing complex objects directly can make required steps, optional values, and validation hard to manage. | 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 trigger actions without tightly coupling the code that requests an operation to the code that performs it, and it may also need queuing, history, or undo support. |
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| Integration notes | Builder is most useful when construction must happen in controlled steps and the final object has many optional or ordered parts. | 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. | Commands work well for UI actions, background jobs, workflow steps, and undoable operations because invokers can trigger commands without depending on receiver details. |