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📎 #eip
channel_adapter
Background
- Problem: connecting an application to send / receive messages
Pattern
TLDR
Use a Channel Adapter to decouple logic for interacting with a messageChannel
QUOTE
Example: Stock Trading
- A stock trading system may wish to keep a log of all of a stock's prices in a database table
- Channel-to-RDBMS
- relational database adapter that logs each message from a channel to a specified table and schema
- Internet-to-channel adapter
- The system may also be able to:
- Recieve external quote requests from the Internet (TCP/IP or HTTP)
- Send them on its internal quote-request channel with the internal quote requests
- The system may also be able to:
Example: Commercial EAI Tools
- Commercial EAI vendors provide a collection of Channel Adapters as part of their offerings
- Having adapters to all major application packages available simplifies development of an integration solution greatly
- Most vendors also provide more generic database adapters as well as software development kits (SDK's) to develop custom adapters
Example: Legacy Platform Adapters
- A number of vendors provide adapters from common messaging system to legacy systems executing on platforms such as as UNIX, MVS, OS/2, AS/400, Unisys, and VMS
- Most of these adapters are specific to a certain messaging system
- For example, Envoy Technologies'
EnvoyMQis a Channel Adapter that connects many legacy platforms with MSMQ- Components:
- Client that runs on the legacy computer
- Server that runs on a Windows computer with MSMQ
- Components:
References
- Enterprise Integration Patterns by Gregor Hohpe, Bobby Woolf