Select a Pattern Agnostic Capability Agnostic Context Agnostic Sub-Controller Asynchronous Queuing Atomic Service Transaction Brokered Authentication Canonical Expression Canonical Protocol Canonical Resources Canonical Schema Canonical Schema Bus Canonical Versioning Capability Composition Capability Recomposition Compatible Change Compensating Service Transaction Composition Autonomy Concurrent Contracts Contract Centralization Contract Denormalization Cross-Domain Utility Layer Data Confidentiality Data Format Transformation Data Model Transformation Data Origin Authentication Decomposed Capability Decoupled Contract Direct Authentication Distributed Capability Domain Inventory Dual Protocols Enterprise Inventory Enterprise Service Bus Entity Abstraction Event-Driven Messaging Exception Shielding Federated Endpoint Layer File Gateway Functional Decomposition Intermediate Routing Inventory Endpoint Legacy Wrapper Logic Centralization Message Screening Messaging Metadata Metadata Centralization Multi-Channel Endpoint Non-Agnostic Context Official Endpoint Orchestration Partial State Deferral Partial Validation Policy Centralization Process Abstraction Process Centralization Protocol Bridging Proxy Capability Redundant Implementation Reliable Messaging Rules Centralization Schema Centralization Service Agent Service Broker Service Callback Service Data Replication Service Decomposition Service Encapsulation Service Facade Service Grid Service Instance Routing Service Layers Service Messaging Service Normalization Service Perimeter Guard Service Refactoring State Messaging State Repository Stateful Services Termination Notification Three-Layer Inventory Trusted Subsystem UI Mediator Utility Abstraction Validation Abstraction Version Identification Overview     History     Acknowledgements     Podcasts     Notification Form     Feedback Form     Press Release #1     Press Release #2     Press Release #3 Master SOA Design Pattern Catalog     Master Pattern List (alphabetical)     Master Pattern List (by category)     Master Pattern List with Page Numbers (PDF)     Master Pattern List (Text)     Pattern Notation     Pattern Profiles     Symbol Legend     Pattern Contribution Form SOA Candidate Patterns     SOA Patterns Review Committee     Candidate Patterns Overview     Candidate Patterns List     Candidate Pattern Contribution Form     Candidate Pattern Feedback Form     SOA Pattern Template Design Pattern Basics     What's a Design Pattern?     What's a Design Pattern Language?     What's a Compound Pattern? Supplemental     SOA Patterns and Application Technologies     SOA Design Patterns Historical Influences     SOA Design Patterns and Design Principles     SOA Design Patterns and Design Granularity     Legal Resources     Design Patterns Publications     Reference Posters     SOAPrinciples.com     WhatIsSOA.com     SOA Visio Stencil About the Book SOA Design Patterns by Thomas Erl For more information visit: www.soapatterns.com Related Publications "Introducing SOA Design Patterns", SOA World Magazine (PDF) "The Case for Single-Purpose Services: Understanding the Non-Agnostic Context and a Strategy for Implementation", SOA Magazine (HTML) "REST-Inspired SOA Design Patterns", SOA Magazine (HTML) "Service-Orientation and Object-Orientation Part I: A Comparison of Goals and Concepts", SOA Magazine (HTML) "Service-Orientation and Object-Orientation Part II: A Comparison of Design Principles", SOA Magazine (HTML) "Service Facade", InformIT (HTML) "Non-Agnostic Context", InformIT (HTML) "Domain Inventory", InformIT (HTML) "Service Normalization", InformIT (HTML) "Service Decomposition", InformIT (HTML) "Canonical Schema", InformIT (HTML) "Policy Centralization", InformIT (HTML) Composition Extension (candidate) Home > Candidate Patterns List > Composition Extension How can the scope of a composition be extended without impacting its existing consumers? Problem When making a service composition available for new consumers, its scope may need to be augmented, thereby risking impact to existing consumers. Solution Through the strategic positioning of composition endpoints, the composition can be reconfigured to accommodate a range of new consumers without affecting established consumers. Application Various design approaches can be applied, several of which depend on the further application of the Composition Endpoints pattern. Impacts The complexity of the composition design can increase and there is a further risk that by accommodating too many consumers, composition governance will become unwieldy. Principles Service Reusability, Service Composability Architecture Composition Status In Development Contributor Thomas Erl   Contributor Notes This is one of several composition refactoring design patterns that I¡¦m working on. Because of its dependency on Composition Endpoints it probably won¡¦t be ready for a full-scale review until complex composition design and governance becomes a commonplace design concern. - Thomas Erl

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