1 / 40

Enterprise Application Integration

Enterprise Application Integration. Walter Moerkerken Ilona Wilmont Integratie Software Systemen 8 mei 2006. Evolution of software architecture Middleware and EAI Message Brokers EAI with message brokers Publish/subscribe model of interaction History Workflow Management systems

barbrah
Télécharger la présentation

Enterprise Application Integration

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Enterprise Application Integration Walter Moerkerken Ilona Wilmont Integratie Software Systemen 8 mei 2006

  2. Evolution of software architecture Middleware and EAI Message Brokers EAI with message brokers Publish/subscribe model of interaction History Workflow Management systems WfMs`s WfMs als programmeertaal Conclusions Today’s topics

  3. Evolution of software architecture

  4. Information system design • Presentation layer - communication with other entities • Application logic layer - actual operation • Resource management layer - data to work with

  5. Architectural design • Information systems are composed of several layers, or tiers. • One-tier architectures • Two-tier architectures • Three-tier architectures • N-tier architectures

  6. Middleware and EAI

  7. Middleware • Interaction between applications across heterogeneous platforms • Solution to integrating set of servers and applications under a common service interface • Basic infrastucture behind distributed information system

  8. Enterprise Application Integration • Extends middleware capabilities to cope with application integration • Uses application logic layers of different middleware systems as building blocks

  9. The supply chain • Customer request - Querying company • Order processing - Analysis and verification purchase order - Scheduling manufacturing of goods • Order fulfillment - Delivery to customer - Financial issues

  10. Difficulties • Different operating system • Support for different interfaces and functionality • Different data format • Different security requirements • Different infrastructure and interaction protocols

  11. Message Brokers

  12. Traditional MOM • Point-to-point links • No support for routing logic • No support for heterogeneity • Sender identifies receiver • Complexity increases as more applications are added to the system

  13. Message Brokers • Enhanced MOM-systems • Distribution of messages • Provides flexibility in routing • Filtering of messages • Processing of messages • Adapters for uniform data format • Routing logic moved to middleware

  14. Routing logic • Based on sender’s identity, message type or message content • Rule-based language • Message broker level • Queue level

  15. MOM vs. Message Brokers

  16. Message Broker Problems • No tools provided for debugging and maintenance • Performance decreases if application-specific rules are executed at each delivery • Inability to handle large messages

  17. EAI with message brokers

  18. EAI platform components • Adapters • map heterogeneous data formats into common format • Message broker • facilitates interaction among back-end systems

  19. Advantages of message brokers • Lower development cost • Lower opportunity costs • Lower maintenance effort

  20. Publish/subscribe interaction model

  21. Publish/subscribe overview • Sender publishes message to middleware • Receivers subscribe with middleware to register their interest

  22. Decoupling • Time • not actively participating in event at the same time • Space • no references to each other • Synchronisation • asynchronous publication and notification

  23. Types of publish/subscribe • Topic-based • Content-based • Type-based

  24. Topic-based publish/subscribe • Earliest scheme, based on topics • Identified by keywords • Represented as strings • Improvement: hierarchical addressing • SupplyChain.newPO • Static scheme with limited expressive power

  25. Content-based publish/subscribe • Based on content of message • Attributes • Meta-data associated with message • Subscribe using subscription language • Specify filters for valid events • type = “newPO” AND quantity = “1200”

  26. Type-based publish/subscribe • Only a suggestion • Filtering messages according to type • Message kind linked to message type • Closer integration of language and middleware

  27. Workflow Management Systems

  28. Workflow Management Systems • Geschiedenis • Wat is een workflow? • Uitvoering van een workflow • Workflow als programmeertaal • Workflows met andere Middleware • Voordelen/Nadelen

  29. Geschiedenis • WfMs`s in chronologische volgorde • Administrative workflows • Production workflows • WfMs`s vs. EAI tools • Heterogeniteit • Logica definitie • Perfecte combinatie

  30. Workflow Management Systems • Geschiedenis • Wat is een workflow? • Uitvoering van een workflow • Workflow als programmeertaal • Workflows met andere Middleware • Voordelen/Nadelen

  31. Wat is een workflow? • Workflow proces: • Work Nodes • Routing Nodes • Start & Completion Nodes • Workflow instantie

  32. Workflow Management Systems • Geschiedenis • Wat is een workflow? • Uitvoering van een workflow • Workflow als programmeertaal • Workflows met andere Middleware • Voordelen/Nadelen

  33. Uitvoering van een Workflow Workflow Engine

  34. Workflow Management Systems • Geschiedenis • Wat is een workflow? • Uitvoering van een workflow • Workflow als programmeertaal • Workflows met andere Middleware • Voordelen/Nadelen

  35. Workflow als programmeertaal • Variabelen • Uitvoerder van de procedure • Resource regels • Afhandeling van fouten is anders • Forward Recovery • Backward Recovery • Exception-handling Languages • Deadlines

  36. Workflow Management Systems • Geschiedenis • Wat is een workflow? • Uitvoering van een workflow • Workflow als programmeertaal • Workflows met andere Middleware • Voordelen/Nadelen

  37. Workflow met andere middleware

  38. Workflow Management Systems • Geschiedenis • Wat is een workflow? • Uitvoering van een workflow • Workflow als programmeertaal • Workflows met andere Middleware • Voordelen/Nadelen

  39. Voordelen: Snel procesontwerp Foutenafhandeling Makkelijk te ondersteunen Nadelen: Een overvloed aan workflows Dure software licenties Complexe installatie en operatie Lange ontwikkelingsfase Voordelen/Nadelen

  40. Conclusies Message broker & Workflow in EAI: • Message broker • Workflow modegevoelig • Lijmen van verschillende systemen • Bieden (nog) niet wat men verwachtte • Samenvoeging • Waarom zoekt men nog wel naar iets anders?

More Related