Analysis

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Abstract FactoryAdapterBridgeBuilderChain of ResponsibilityCommandCompositeDecoratorFacadeFactory MethodFlyweightInterpreterIteratorMediatorMementoObserverPrototypeProxySingletonStateStrategyTemplate MethodVisitor

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Analysis

Pattern comparison

Reviewing 3 patterns.

Criteria
structuralBridgeView pattern
behavioralChain of ResponsibilityView pattern
behavioralMementoView pattern
Basics
Categorystructuralbehavioralbehavioral
SummarySeparate an abstraction from its implementation so the two can vary independently.Pass a request through a sequence of handlers until one handles it or the chain ends.—
IntentDecouple abstractions from implementations so they can evolve independently.Pass requests along a chain of handlers until one of them handles the request or the request reaches the end of the chain.Capture and externalize an object's state so it can be restored to a previous point in time.
Decision factors
ProblemWhen an abstraction is tightly coupled to its implementation, changing one side forces changes in the other and makes the system harder to evolve.A request must pass through multiple possible handlers, but the sender should not need to know which handler will process it.An object's internal state must be saved and restored later without exposing its implementation details.
Tradeoffs
  • Adds an extra layer of indirection.
  • Can increase the number of moving parts.
  • Makes abstractions and implementations easier to evolve independently.
  • Requests can become harder to trace because control flows through multiple handlers.
  • A long chain may add overhead if many handlers are checked on every request.
  • It keeps handler logic isolated and easier to extend.
  • Snapshots can consume memory if many states are stored.
  • Care must be taken to keep mementos immutable and hidden from outside code.
Practical fit
Languages
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
  • go
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
Platforms
  • web
  • backend
  • mobile
  • integration
  • ui
  • frontend
  • backend
  • integration
  • Web
  • Backend
  • Mobile
  • UI kits
  • Cross-platform systems
Integration notesBridge is useful when you want one stable abstraction while swapping implementations for providers, environments, or device targets.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.Memento is useful for undo/redo, checkpoints, draft recovery, and any workflow where state history matters.