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 Reliable Messaging (Little, Rischbeck, Simon) Home > Service Messaging Patterns > Reliable Messaging How can services communicate reliably when implemented in an unreliable environment?   Problem Service communication cannot be guaranteed when using unreliable messaging protocols or when dependent on an otherwise unreliable environment. Solution An intermediate reliability mechanism is introduced into the inventory architecture, ensuring that message delivery is guaranteed. Application Middleware, service agents, and data stores are deployed to track message deliveries, manage the issuance of acknowledgements, and persist messages during failure conditions. Impacts Using a reliability framework adds processing overhead that can affect service activity performance. It also increases composition design complexity and may not be compatible with Atomic Service Transaction. Principles Service Composability Architecture Inventory, Composition   When building services as Web services, this pattern is commonly applied by implementing a combination of the WS-ReliableMessaging standard (A) and guaranteed delivery extensions, such as a persistent repository (B). This figure highlights the typical moving parts of the resulting reliability framework. Audio Podcast This pattern is discussed as part of the audio podcast: The ESB and Related Messaging Patterns   Related Patterns in This Catalog Asynchronous Queuing (Little, Rischbeck, Simon), Canonical Resources (Erl), Event-Driven Messaging (Little, Rischbeck, Simon), Message Metadata (Erl), Service Agent (Erl), Service Callback (Karmarkar), Service Messaging (Erl), State Messaging (Karmarkar) Related Patterns in Other Catalogs Guaranteed Delivery (Hohpe, Woolfe) Related Service-Oriented Computing Goals Increased Vendor Diversification Options, Reduced IT Burden This page contains excerpts from: SOA Design Patterns by Thomas Erl Foreword by Grady Booch With contributions from David Chappell, Jason Hogg, Anish Karmarkar, Mark Little, David Orchard, Satadru Roy, Thomas Rischbeck, Arnaud Simon, Clemens Utschig, Dennis Wisnosky, and others. (ISBN: 0136135161, Hardcover, Full-Color, 400+ Illustrations, 865 pages) For more information about this book, visit www.soabooks.com.

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