Business process modelling Integration patterns

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Business process modelling Integration patterns

• Enn Õunapuu
• Tallinna Tehnikaülikool
• enn_at_cc.ttu.ee

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Why Do We Need Integration?

• Today's business applications rarely live in
  isolation. Users expect instant access to all
  business functions an enterprise can offer,
  regardless of which system the functionality may
  reside in. This requires disparate applications
  to be connected into a larger, integrated
  solution. This integration is usually achieved
  through the use of some form of "middleware".
  Middleware provides the "plumbing" such as data
  transport, data transformation, and routing.

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Patterns categories

• Channel Patterns describe different types of
  message channels and show how to determine which
  channels a solution will need.
• Message Construction Patterns describe different
  ways messages can be used and how to form
  messages.
• Routing Patterns describe the routing of messages
  from the source to the destination.
• Transformation Patterns describe how to transform
  message content so that messages can be consumed
• System Management Patterns show ways to test and
  monitor a running integration solution.

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Loan Broker example
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Loan Broker Tasks

• 1. Receive requests from the customer
• 2. Obtain credit information from the credit
  bureau
• 3. Determine the appropriate banks to contact
• 4. Send a request for quote to each bank
• 5. Receive replies from each bank and determine
  the best quote
• 6. Pass the best quote back to the customer

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Step1 Receiving Requests - Service Interface

• Service Interface ESP
• Problem How do you make pieces of your
  application's functionality available to other
  applications, while ensuring that the interface
  mechanics are decoupled from the application
  logic?
• Solution Design your application as a collection
  of software services, each with a Service
  Interface through which consumers of the
  application may interact with the service.

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Step 2 Obtaining Credit Information

• Content Enricher
• Problem How do you communicate with another
  system if the message originator does not have
  all the required data items available?
• Solution Use a specialized transformer, a
  Content Enricher, to access an external data
  source in order to augment a message with missing
  information.

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Step 3 Determine Appropriate Banks
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Step 4 Making Bank Requests
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Step 5 Processing Bank Replies

• Aggregator
• Problem How do you combine the results of
  individual, but related messages so that they can
  be processed as a whole?
• Solution Use a stateful filter, an Aggregator,
  to collect and store individual messages until a
  complete set of related messages has been
  received. Then, the Aggregator publishes a single
  message distilled from the individual messages.

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Step 6 Reply to the Customer

• Message Translator
• Problem How can systems using different data
  formats communicate with each other using
  messaging?
• Solution Use a special filter, a Message
  Translator, between other filters or applications
  to translate one data format into another.

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Solution Architecture
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Basic Technology Choices

• Web Services vs. Remoting vs. Messaging
• Synchronous vs. Asynchronous Interaction
• BizTalk Server Orchestration vs. C

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The Loan Broker Solution Architecture with
Technology Choices
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Service Interface with BizTalk Server 2004
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Implementing a Recipient List using the Parallel
Actions shape
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Implementing a Recipient List using the Loop
shape
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Message Translator with BizTalk Server 2004
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Business process definition

• A process is a specific ordering of work
  activities across time and place, with a
  beginning, an end, and clearly defined inputs and
  outputs a structure for action1. Business
  processes are both internal and external to
  autonomous business entities, and drive their
  collaboration to achieve shared business goals by
  enabling highly fluid process networks. Such
  business goals include end-to-end efficiency,
  transformation empowerment, and value management.

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Business process

• Business processes are adaptive structures for
  action through which many participantsIT
  systems, applications, users, partners, and other
  processesplay a variety of roles. Business
  Process Management enables the collaboration of
  such participants in a reliable, scalable, and
  secure manner, by supporting dynamic process
  topologies that allow the boundary between
  processes and participants to be determined
  on-the-fly by long-term and real-time business
  goals, while retaining synchronized public
  interfaces associated with trading partner
  agreements.

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Synchronizing parallel activities
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Business process executable language
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BPEL

• l The ltcontainersgt section defines the data
  containers used by the process, providing their
  definitions in terms of WSDL message types.
  Containers allow processes to maintain state data
  and process history based on messages exchanged.
• l The ltpartnersgt section defines the different
  parties that interact with the business process
  in the course of processing the order. The four
  partners shown here correspond to the sender of
  the order (customer), as well as the providers of
  price (invoiceProvider), shipment
  (shippingProvider), and manufacturing scheduling
  services (schedulingProvider). Each partner is
  characterized by a service link type and a role
  name. This information identifies the
  functionality that must be provided by the
  business process and by the partner for the
  relationship to succeed, that is, the portTypes
  that the purchase order process and the partner
  need to implement.

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Thank You