Analysis

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Abstract FactoryAdapterBridgeBuilderChain of ResponsibilityCommandCompositeDecoratorFacadeFactory MethodFlyweightInterpreterIteratorMediatorMementoObserverPrototypeProxySingletonStateStrategyTemplate MethodVisitor

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Analysis

Pattern comparison

Reviewing 3 patterns.

Criteria
structuralAdapterView pattern
behavioralCommandView pattern
structuralFlyweightView pattern
Basics
Categorystructuralbehavioralstructural
SummaryConvert the interface of a class or module into another interface clients expect.Encapsulate a request as an object so it can be invoked, queued, logged, or undone independently of the receiver that performs the work.—
IntentAllow incompatible interfaces to work together without changing the consuming code.Encapsulate a request as an object so it can be invoked, queued, logged, or undone independently of the receiver that performs the work.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 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.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.
  • Introduces extra classes or objects for each action.
  • Can feel heavier than direct method calls when the workflow is simple.
  • Makes requests more flexible, loggable, and replayable.
  • 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
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
Platforms
  • applications
  • apis
  • service layers
  • integrations
  • frontend
  • backend
  • integration
  • 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.Commands work well for UI actions, background jobs, workflow steps, and undoable operations because invokers can trigger commands without depending on receiver details.Flyweight is useful when thousands or millions of similar objects need to be represented efficiently, such as trees, glyphs, tiles, or UI tokens.