Chapter 5: Technical Summary of Middleware

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Chapter 5 Technical Summary of Middleware

• Textbook
• IT Architectures and Middleware, Second Edition
• Chris Britton and Peter Bye
• AIT 600
• Jeff Schmitt
• October 13, 2008

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Middleware Elements

• Communications link
• The Protocol
• Programmatic Interface
• Data Presentation Common data format
• Server Control
• Naming and directory services
• Security
• Systems management

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Vendor Architectures

• Vendor Platform Architecture
• Vendor-distributed Architecture
• Using Vendor Architectures
• Positioning
• Strawman for user target audience
• Marketing
• Implicit architectures

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Middleware Interoperability
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Summary

• Middleware products classified
• Technology Client/server, peer-to-peer, push
• Integrity message integrity (delivery
  guarantee), transaction integrity
• Differences among products Huge variety in API
• SOAP dictates basic message transfer facility
• but allows enhancement by headers or protocol
  layered on top of SOAP
• No standard API, and some APIs restrict the Web
  services functionality
• Vendor products
• Moving from tightly coupled to loosely coupled
  middleware
• .NET (more PL) and J2EE (more platforms) are
  remarkably similar, same basic notions of tiering
  and just-in-time compilation

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Summary

• Middleware interoperability
• Possible and often important
• Important technical issue is integrity, not to
  lose integrity when moving from one middleware
  technology to another
• Message and transaction integrity can be
  implemented by two-phase commit transactions on
  the middleware hub
• Applications can check on integrity, checking to
  see if last transaction was done, reversal
  transactions to undo previous work if needed