Analysis

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Abstract FactoryAdapterBridgeBuilderChain of ResponsibilityCommandCompositeDecoratorFacadeFactory MethodFlyweightInterpreterIteratorMediatorMementoObserverPrototypeProxySingletonStateStrategyTemplate MethodVisitor

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Analysis

Pattern comparison

Reviewing 3 patterns.

Criteria
structuralAdapterView pattern
structuralBridgeView pattern
behavioralCommandView pattern
Basics
Categorystructuralstructuralbehavioral
SummaryConvert the interface of a class or module into another interface clients expect.Separate an abstraction from its implementation so the two can vary independently.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.Decouple abstractions from implementations so they can evolve independently.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
ProblemA client needs to talk to a legacy class or external service whose interface does not match the rest of the codebase.When an abstraction is tightly coupled to its implementation, changing one side forces changes in the other and makes the system harder to evolve.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.
Tradeoffs
  • Adds an extra layer of indirection.
  • Can hide useful vendor-specific capabilities if overused.
  • Keeps integration code isolated from core domain logic.
  • Adds an extra layer of indirection.
  • Can increase the number of moving parts.
  • Makes abstractions and implementations easier to evolve independently.
  • 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.
Practical fit
Languages
  • typescript
  • java
  • python
  • go
  • csharp
  • dotnet
  • react
  • angular
  • react-native
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
  • go
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
Platforms
  • applications
  • apis
  • service layers
  • integrations
  • web
  • backend
  • mobile
  • integration
  • ui
  • frontend
  • backend
  • integration
Integration notesAdapters are useful when exposing a stable boundary over a legacy API, vendor SDK, or payload format mismatch.Bridge is useful when you want one stable abstraction while swapping implementations for providers, environments, or device targets.Commands work well for UI actions, background jobs, workflow steps, and undoable operations because invokers can trigger commands without depending on receiver details.