Analysis

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Abstract FactoryAdapterBridgeBuilderChain of ResponsibilityCommandCompositeDecoratorFacadeFactory MethodFlyweightInterpreterIteratorMediatorMementoObserverPrototypeProxySingletonStateStrategyTemplate MethodVisitor

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Analysis

Pattern comparison

Reviewing 3 patterns.

Criteria
creationalAbstract FactoryView pattern
behavioralChain of ResponsibilityView pattern
behavioralObserverView pattern
Basics
Categorycreationalbehavioralbehavioral
SummaryProvide an interface for creating families of related objects without specifying their concrete classes.Pass a request through a sequence of handlers until one handles it or the chain ends.—
IntentProvide an interface for creating families of related objects without specifying their concrete classes.Pass requests along a chain of handlers until one of them handles the request or the request reaches the end of the chain.Define a subscription mechanism so multiple observers can react to subject events without the subject knowing concrete subscriber details.
Decision factors
ProblemClient code needs to create families of related objects, but hardcoding concrete classes makes the code rigid and hard to swap.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 notify multiple dependent objects when state changes occur, but hardcoding those dependencies makes the design rigid and tightly coupled.
Tradeoffs
  • Adds an extra abstraction layer.
  • Can overcomplicate simple object creation.
  • Makes family-wide swapping and consistency much easier.
  • 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.
  • Notification flows can become hard to trace when many observers react to the same event
  • Observers may receive updates they do not need unless subscriptions are carefully designed
Practical fit
Languages
  • typescript
  • java
  • python
  • react
  • angular
  • csharp
  • dotnet
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
  • typescript
  • java
  • python
  • angular
  • react
  • react-native
  • csharp
  • dotnet
Platforms
  • applications
  • ui systems
  • integration layers
  • frontend
  • backend
  • integration
  • Web
  • Backend
  • Event-driven systems
Integration notesAbstract Factory is especially useful when your app must produce matching sets of related objects for a theme, provider, platform, or pipeline.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.Observers work well inside a single application boundary for UI events, domain events, and in-process notifications where subscribers change dynamically.