Analysis

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Abstract FactoryAdapterBridgeBuilderChain of ResponsibilityCommandCompositeDecoratorFacadeFactory MethodFlyweightInterpreterIteratorMediatorMementoObserverPrototypeProxySingletonStateStrategyTemplate MethodVisitor

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Analysis

Pattern comparison

Reviewing 2 patterns.

Criteria
structuralAdapterView pattern
structuralFlyweightView pattern
Basics
Categorystructuralstructural
SummaryConvert the interface of a class or module into another interface clients expect.—
IntentAllow incompatible interfaces to work together without changing the consuming code.Use sharing to support large numbers of fine-grained objects efficiently by separating shared intrinsic state from per-object extrinsic state.
Decision factors
ProblemA client needs to talk to a legacy class or external service whose interface does not match the rest of the codebase.A system creates a large number of similar objects, but storing all of their state separately uses too much memory.
Tradeoffs
  • Adds an extra layer of indirection.
  • Can hide useful vendor-specific capabilities if overused.
  • Keeps integration code isolated from core domain logic.
  • Adds complexity because state must be split into shared and unshared parts
  • Can be harder to understand when many objects depend on an external context
Practical fit
Languages
  • typescript
  • java
  • python
  • go
  • csharp
  • dotnet
  • react
  • angular
  • react-native
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
Platforms
  • applications
  • apis
  • service layers
  • integrations
  • Web
  • Backend
  • Mobile
  • UI kits
  • Cross-platform systems
Integration notesAdapters are useful when exposing a stable boundary over a legacy API, vendor SDK, or payload format mismatch.Flyweight is useful when thousands or millions of similar objects need to be represented efficiently, such as trees, glyphs, tiles, or UI tokens.