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Appetizers of 
Enterprise Integration Patterns
 with Spring Integration

Appetizers of 
Enterprise Integration Patterns
 with Spring Integration

Given at the Barcelona Java Users Group.

Rafael Cordones

April 22, 2013
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  1. Rafael Cordones, [email protected]
    BarcelonaJUG, April 22rd, 2013, Barcelona
    Appetizers of
    Enterprise Integration Patterns
    with Spring Integration
    @rafacm

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  2. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    A byte about me
    n Some background information about myself:
    n FIBer (Barcelona, 2000) and KTHer (Stockholm, 2004)
    n Barcelonian by birth. European by choice.
    Currently living in Vienna.
    n Experience working for small companies developing web-based
    software products for business customers (B2B).
    n Inoculated against the Not Invented Here syndrome and
    instead prefer to embrace a Proudly Found Elsewhere attitude!
    n Java (ecosystem) developer… learning Scala now!
    2
    Chemistry + HP48 GX --> Wittig reaction --> Software developer!
    Source: http://en.wikipedia.org/wiki/Wittig_reaction

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  3. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    What’s ahead?
    n Introduction
    n Enterprise Integration Patterns (EIP)
    n The patterns book(s)
    n Enterprise software development
    n Enterprise application integration
    n Enterprise application integration styles
    n EIP Messaging Concepts (Reader’s Digest version)
    n Demo (with Spring Integration): let’s have some appetizers!
    n The process manager pattern, BPMN 2.0 and camunda BPM platform
    n Short demo: the job announcement
    n Ongoing discussion? Yes! That would be great!
    3

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  4. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Ready?
    4
    From the movie: “Spies Like Us” by John Landis. 1985.

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  5. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    A bit about you?
    n How many of you have experience with enterprise application integration
    projects (in-house and B2B)?
    n How many of you are familiar with Spring Integration or Apache Camel?
    n How many of you have experience with a business process engine
    (jBPM, Activiti, camunda BPM)?
    5

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  6. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Participation is welcome… and rewarded!
    6
    Participation / questions / answers?!
    You get:
    or
    You choose!

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  7. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Enterprise Integration Patterns
    7
    EIP P of EAA

    GoF
    n The book(s)

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  8. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Anatomy of a Pattern
    n A pattern
    n has a name (reference)
    n is a applicable in a given context
    n describes a recognizable problem
    n includes considerations/constraints to take into account (forces)
    n solution(s)
    n sketch illustrating the solution
    n other patterns to be considered
    n examples
    n diagram notation (icons)
    8
    Patterns are not just LEGO pieces for a solution.
    They almost always need to be adapted to a given context.
    Source: http://www.eaipatterns.com/Introduction.html

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  9. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    So what
    9
    Enjoy Miles Davis’ So What on YouTube!

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  10. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Software Development
    Q: Is software development an
    individual activity?
    A: It depends.
    Q: On what?
    A: On the context.
    10
    Source: http://en.wikipedia.org/wiki/
    On_the_Internet,_nobody_knows_you're_a_dog
    “On the Internet, nobody knows you’re a dog.”
    “Any fool can write code that a computer
    can understand.
    Good programmers write code that
    humans can understand”.
    -- Martin Fowler

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  11. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Software Development
    Q: Is software development an
    individual activity?
    A: It depends.
    Q: On what?
    A: On the context.
    10
    Source: http://en.wikipedia.org/wiki/
    On_the_Internet,_nobody_knows_you're_a_dog
    “On the Internet, nobody knows you’re a dog.”
    “Any fool can write code that a computer
    can understand.
    Good programmers write code that
    humans can understand”.
    -- Martin Fowler
    Which code?!
    To do what exactly?

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  12. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Enterprise Software Development
    11
    Source: http://www.projectcartoon.com

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  13. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Large Scale
    Enterprise Software Development
    12
    “The Tower of Babel” by Pieter Bruegel the Elder (1563). Kunsthistorisches Museum, Vienna.

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  14. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Large Scale
    Enterprise Software Development…
    13
    “The (Little) Tower of Babel” by Pieter Bruegel the Elder (1563). Museum Boijmans Van Beuningen. Rotterdam.
    … now on the Cloud!

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  15. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    n Question: why?
    One answer: perception leads reality and not the other way around!
    n Words do not have meaning by themselves. We give meaning to them.
    n It’s then fundamental to have a common, rigorous language to communicate.
    14
    From “Understanding Comics: The Invisible Art”. Scott McCloud. 1993. Pages 194-195.
    Enterprise Software Development

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  16. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    15
    Enterprise Application
    Integration

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  17. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Enterprise Application Integration
    16
    “The Tower of Babel” by Pieter Bruegel the Elder (1563). Kunsthistorisches Museum, Vienna.

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  18. n Same happens with independently built systems:
    n Different technologies
    n Different programming languages
    n Different terms/vocabulary
    n Different representations the same concepts
    BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Enterprise Application Integration
    17
    Invoicing
    CRM
    HRM
    CRM
    Stock
    Sales
    SAP
    “O, be some other name!
    What's in a name? that which we call an [order]
    By any other name would smell as sweet;”
    -- William [Software Architect] Shakespeare
    “organizations which design systems […] are constrained to
    produce designs which are copies of [their own] communication
    structures”
    -- Conway’s Law*
    * “How Do Committees Invent?” Melvin E. Conway http://www.melconway.com/research/committees.html

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  19. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    18
    Enterprise Application
    Integration Styles

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  20. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Integration Styles: File Transfer
    n Pros: easy, COBOL-proof
    n Cons: concurrency, transactions, … ?
    19
    Source: http://www.eaipatterns.com/FileTransferIntegration.html

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  21. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Integration Styles: Shared Database
    n Pros: simple, transactional
    n Cons: all applications are coupled, caching, … ?
    20
    Source: http://www.enterpriseintegrationpatterns.com/SharedDataBaseIntegration.html

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  22. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Integration Styles:
    Remote Procedure Invocation (RPC)
    n Pros: known object-oriented approach, simple, …
    n Cons: interoperability, versioning, hidden (API) complexity, …?
    n Is synchronous behavior a pro or a con? It depends!
    21
    Source: http://www.eaipatterns.com/EncapsulatedSynchronousIntegration.html

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  23. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Integration Styles: Messaging
    n Pros:
    n Embraces asynchronous behavior
    n De-coupled applications (coupling is about assumptions!)
    n The messaging system (bus) is responsible for transferring the data
    n Cons:
    n It’s more complex than the other styles (transactions, error reporting,
    sequencing)
    22
    Source: http://www.eaipatterns.com/Messaging.html

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  24. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Asynchronous programming model
    n HTML5 / JavaScript anyone?
    23
    I’m too old for this s…
    From the movie: “Lethal Weapon” by Richard Donner. 1987.

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  25. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    24
    EIP Messaging Concepts
    (Reader’s Digest version)

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  26. n “Logical addresses in the messaging system”
    n
    BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Message Channels
    25
    Source: http://eaipatterns.com/MessageChannel.html

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  27. n Point-to-Point:
    n Publish-Subscribe:
    BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Message Channel Types
    26
    Source: http://eaipatterns.com/PointToPointChannel.html, http://eaipatterns.com/PublishSubscribeChannel.html
    There can be more receivers!

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  28. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Messages = Header(s) + Payload or Body
    n Header: information used/needed by the messaging system
    n Body/Payload: the actual data we are interested in transmitting
    n Types:
    n Command message: invoke an action at the receiver
    n Document message: pass data to the receiver (content is the concern)
    n Event message: notify the receiver (timing is the concern)
    27

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  29. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Channel Adapter
    n “How can connect an application to the messaging system so that it can
    send and receive messages?”
    28
    Source: http://www.eaipatterns.com/ChannelAdapter.html

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  30. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Message Routing
    n Content-based routers: output channel depends on message body
    n Context-based router: output channel depends on the environment
    n load-balancing
    n stateless router vs. dynamic routing
    29

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  31. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Message Translator
    n How can systems using different data formats communicate with each
    other?
    n Watch out! Translation has to happen at different levels:
    n Transport: FTP to HTTP, …
    n Data representation: CSV to XML, …
    n Data types: and “Order” here is not an “Order” there
    n Data structures: HL7, CMIS,
    30
    Source: http://www.eaipatterns.com/MessageTranslator.html

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  32. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    31
    EIP Example(s)

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  33. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Widgets & Gadgets ‘R Us (WGRUS) 1/2
    32
    Source: http://www.eaipatterns.com/Chapter1.html

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  34. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Widgets & Gadgets ‘R Us (WGRUS) 2/2
    33
    Source: http://www.eaipatterns.com/Chapter1.html

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  35. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Tapas2Go: Tapas as a Service (TaS)
    n Yummy! Yummy! Demo
    34
    @Tapas2Go What’s today’s menu?
    Source: http://en.wikipedia.org/wiki/Tapas
    @Tapas2Go order tortilla calamares chopitos
    https://github.com/plexiti/tapas2go

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  36. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Tapas2Go: Tapas as a Service (Tas)
    35
    Demo

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  37. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Tapas2Go: Did you notice something?
    n Business logic starts getting difficult to understand --> maintain!
    n Even more when we need to maintain a conversation (state between
    messages)!
    36
    Source: http://www.eaipatterns.com/ProcessManager.html

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  38. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Enter the Process Manager
    n Advantages:
    n manages state between messages (conversation)
    n stores intermediate results
    n determines next processing step(s)
    n with a proper notation --> easier to understand the big picture
    37
    Source: http://www.eaipatterns.com/ProcessManager.html

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  39. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Order Processing (For Real)
    n UML activity diagram:
    38
    Source: http://www.eaipatterns.com/Chapter1.html
    Question:
    How do we implement it
    in Java?

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  40. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    We’ll be back shortly…
    39
    From the movie: “The Life of Bryan” by Monty Python

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  41. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    What is a business process?
    n Definition: “a sequence of related, structured activities or tasks that produce a
    specific service or product (serve a particular goal) for a particular customer or
    customers.”
    40
    Source: http://en.wikipedia.org/wiki/Business_process

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  42. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    When do I need a business process?
    n Business process modeling acid test*:
    1. Long-running: hours, days, weeks, months, years, …
    2. Bursty, sleeps most of the time:
    when awake, a flurry of activities and then finished or to sleep again!
    3. Persisted state: what happens between different steps or
    when the application server goes down?
    4. Orchestration of system or human communications:
    who has to do what until when? what happens afterwards?
    n What about communication? Common shared understanding?
    n What about organizational learning?
    n How long does it takes us to do X?
    n Who did what when?
    41
    * “Essential Business Process Modeling”, Michael Havey, O’Reilly Press
    http://shop.oreilly.com/product/9780596008437.do via http://stackoverflow.com/questions/4869734/how-do-you-know-when-you-need-a-bpm-solution

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  43. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Business Process Model and Notation 2.0
    n Example: announcing a job position
    42
    Source: “Praxishandbuch BPMN 2.0” http://www.bpm-guide.de/2012/02/16/praxishandbuch-bpmn-2-0-in-der-3-auflage/

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  44. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Business Process Model and Notation 2.0
    n Example: announcing a job position explained… sort of:
    43
    Start event
    Sequence flow
    User (human) task
    Pool (participant)
    Lane
    Gateway (exclusive)
    Call activity
    (sub-process)
    Service
    task
    End
    event
    Activities

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  45. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    EIPs and BPMN 2.0
    n Great! I just need to learn some new symbols and then …
    44
    From the movie: “The Matrix” by Larry and Andy Wachowski. 1999.
    WOAH!
    I know EIPs and BPMN 2.0!

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  46. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    EIPs and BPMN 2.0
    45
    From the movie: “The Matrix” by Larry and Andy Wachowski. 1999.
    In your dreams!
    Mister Anderson

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  47. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    EIPs and BPMN 2.0
    45
    From the movie: “The Matrix” by Larry and Andy Wachowski. 1999.
    In your dreams!
    Mister Anderson
    “It is difficult, if not impossible, for anyone to learn a subject purely by reading about it, without
    applying the information to specific problems and thereby forcing himself to think about what has
    been read. Furthermore, we all learn best the things we have discovered ourselves.”
    -- Donald Knuth, “The Art of Computer Programming”*
    * Via Alexander Daniel: http://lachdrache.wordpress.com/2012/03/11/reading-•-applying-•-thinking/

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  48. Activities Conversations
    Events
    Gateways
    Conversation Diagram
    None: Untyped events,
    indicate start point, state
    changes or final states.
    Message: Receiving and
    sending messages.
    Timer: Cyclic timer events,
    points in time, time spans or
    timeouts.
    Error: Catching or throwing
    named errors.
    Cancel: Reacting to cancelled
    transactions or triggering
    cancellation.
    Compensation: Handling or
    triggering compensation.
    Conditional: Reacting to
    changed business conditions
    or integrating business rules.
    Signal: Signalling across differ-
    ent processes. A signal thrown
    can be caught multiple times.
    Multiple: Catching one out of
    a set of events. Throwing all
    events defined
    Link: Off-page connectors.
    Two corresponding link events
    equal a sequence flow.
    Terminate: Triggering the
    immediate termination of a
    process.
    Escalation: Escalating to
    an higher level of
    responsibility.
    Parallel Multiple: Catching
    all out of a set of parallel
    events.
    Start End
    Intermediate
    Catching
    Throwing
    Event Sub-Process
    Interrupting
    Top-Level
    Event Sub-Process
    Non-Interrupting
    Boundary
    Interrupting
    Boundary Non-
    Interrupting
    Sequence Flow
    defines the execution
    order of activities.
    Conditional Flow
    has a condition
    assigned that defines
    whether or not the
    flow is used.
    Default Flow
    is the default branch
    to be chosen if all
    other conditions
    evaluate to false.
    Task
    A Task is a unit of work, the job to be
    performed. When marked with a symbol
    it indicates a Sub-Process, an activity that can
    be refined.
    Transaction
    A Transaction is a set of activities that logically
    belong together; it might follow a specified
    transaction protocol.
    Event
    Sub-Process
    An Event Sub-Process is placed into a Process or
    Sub-Process. It is activated when its start event
    gets triggered and can interrupt the higher level
    process context or run in parallel (non-
    interrupting) depending on the start event.
    Call Activity
    A Call Activity is a wrapper for a globally defined
    Sub-Process or Task that is reused in the current
    process.
    Task Types
    Types specify the nature of
    the action to be performed:
    Send Task
    Receive Task
    User Task
    Manual Task
    Business Rule Task
    Service Task
    Script Task
    Markers indicate execution
    behavior of activities:
    Activity Markers
    Sub-Process Marker
    Loop Marker
    Parallel MI Marker
    Sequential MI Marker
    ~ Ad Hoc Marker
    Compensation Marker
    A Communication defines a set of
    logically related message exchanges.
    When marked with a symbol it
    indicates a Sub-Conversation, a
    compound conversation element.
    A Forked Conversation Link connects
    Communications and multiple
    Participants.
    A Conversation Link connects
    Communications and Participants.
    Inclusive Gateway
    When splitting, one or more
    branches are activated. All
    active incoming branches must
    complete before merging.
    Complex Gateway
    Complex merging and
    branching behavior that is not
    captured by other gateways.
    Exclusive Event-based Gateway
    (instantiate)
    Each occurrence of a subsequent
    event starts a new process
    instance.
    Parallel Event-based Gateway
    (instantiate)
    The occurrence of all subsequent
    events starts a new process
    instance.
    Pool
    (collapsed)
    Multi Instance Pool
    (collapsed)
    Communication
    Sub-Conversation
    Pool
    (collapsed)
    Participant B
    The order of message
    exchanges can be
    specified by combining
    message flow and
    sequence flow.
    Pool Pool
    Pools (Participants) and Lanes
    represent responsibilities for
    activities in a process. A pool
    or a lane can be an
    organization, a role, or a
    system. Lanes subdivide pools
    or other lanes hierarchically.
    Lane
    Task
    Lane
    Task
    Pool
    Message Flow
    symbolizes information
    flow across organizational
    boundaries. Message flow
    can be attached to pools,
    activities, or message
    events.
    Data
    Task
    Input Out-
    put
    Data Store
    A Data Object represents information flowing
    through the process, such as business
    documents, e-mails, or letters.
    A Data Store is a place where the process can
    read or write data, e.g., a database or a filing
    cabinet. It persists beyond the lifetime of the
    process instance.
    A Data Input is an external input for the
    entire process. It can be read by an activity.
    A Data Output is a variable available as result
    of the entire process.
    A Message is used to depict the contents of a
    communication between two Participants.
    A Collection Data Object represents a
    collection of information, e.g., a list of order
    items.
    Pool (Collapsed)
    Collaboration Diagram
    Pool (Expanded)
    Lane
    Lane
    Choreographies
    Choreography Diagram
    A Choreography Task
    represents an Interaction
    (Message Exchange)
    between two Participants.
    Choreography
    Task
    Participant A
    Participant B
    A Choreography Sub-
    Process contains a refined
    choreography with several
    Interactions.
    Multiple Participants Marker
    denotes a set of
    Participants of the
    same kind.
    Swimlanes
    BPMN 2.0 - Business Process Model and Notation
    Collection
    Ad-hoc Sub-Process
    Task
    Task
    ~
    Message
    Start Event
    Message Flow
    Data Object
    Collapsed
    Sub-Process
    Event-based
    Gateway
    Escalation
    End Event
    Timer
    Intermediate
    Event
    Receive Task
    Attached
    Intermediate
    Timer Event
    Link
    Intermediate
    Event
    Manual Task
    End
    Event
    Data
    Store
    Link
    Intermediate
    Event
    Parallel
    Multiple
    Intermediate
    Event
    Text Annotation
    Group
    Multi Instance
    Task (Parallel)
    Message
    End Event
    Send Task
    Parallel
    Gateway
    Exclusive
    Gateway
    Attached
    Intermediate
    Error Event
    Signal
    End
    Event
    Call Activity
    Sub-Process
    Event Sub-Process
    Conditional
    Start Event
    Error End
    Event
    Start
    Event
    End
    Event
    Looped
    Sub-Process
    condition
    http://bpmb.de/poster
    Participant A
    Participant C
    Participant B
    Choreography
    Task
    Participant A
    Participant B
    Choreography
    Task
    Participant A
    Participant C
    Initiating
    Message
    Response
    Message
    Choreography
    Task
    Participant B
    Participant A
    When splitting, it routes the sequence flow to exactly
    one of the outgoing branches. When merging, it awaits
    one incoming branch to complete before triggering the
    outgoing flow.
    Exclusive Gateway
    Is always followed by catching events or receive tasks.
    Sequence flow is routed to the subsequent event/task
    which happens first.
    Event-based Gateway
    When used to split the sequence flow, all outgoing
    branches are activated simultaneously. When merging
    parallel branches it waits for all incoming branches to
    complete before triggering the outgoing flow.
    Parallel Gateway
    Choreography
    Sub-Process
    Participant A
    Participant C
    Participant B
    DevFest 2012 – November 10th 2012 | Vienna
    plexiti · pragmatic software productions
    BPMN 2.0: Would you like to know more?
    46
    And THE poster!
    PDF: http://www.bpmb.de/images/BPMN2_0_Poster_EN.pdf
    Printed: http://www.signavio.com/joomla/de/bpmn-poster.html
    Get THE book!
    German: http://www.bpm-guide.de/2012/02/16/
    praxishandbuch-bpmn-2-0-in-der-3-auflage/
    English: http://www.bpm-guide.de/2012/10/30/real-life-
    bpmn-2-0-book-now-available-in-english/
    Get the BPMN 2.0 Examples at: http://www.omg.org/cgi-bin/doc?dtc/10-06-02

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  49. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    The camunda BPM Platform
    47
    http://camunda.org @camundaBPM #camunda

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  50. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    The Job Announcement Showcase
    n A kick-start application for your
    business process-centric project!
    n Java EE 6 technology stack
    n camunda fox BPM Platform
    n Try online at:
    http://the-job-announcement.com/
    n Fork, clone, modify, … at
    https://github.com/plexiti/the-job-
    announcement-fox
    n Executable specifications with
    Cucumber and Selenium at
    https://github.com/plexiti/the-job-
    announcement-exec-specs
    48
    Migration to camunda BPM
    coming real soon!

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  51. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    The Job Announcement Showcase
    49
    Short Intro
    http://the-job-announcement.com

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  52. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    50
    What about ?!

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  53. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    What about Apache Camel?!
    n
    51
    Vincent: Do you know the funniest thing about [EIP frameworks]?
    Vincent: It’s the little differences.
    Jules: Example
    From the movie: “Pulp Fiction” by Quentin Tarantino. 1994.

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  54. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    The Job Announcement / Apache Camel
    n “Route-centric”, i.e. where are the channels?
    52
    from("direct:tweets")
    .inOut("twitter://timeline/user")
    .to("log:com.[...].service.camel?level=INFO&showAll=true&multiline=true");
    public void postToTwitter(Long jobAnnouncementId) {
    JobAnnouncement announcement = find(jobAnnouncementId);
    String tweet = announcement.getTwitterMessageWithLink();
    log.info("About to tweet [" + tweet + "].");
    // send tweet to the twitter endpoint **SYNCHRONOUSLY** (because we use the 'direct:'
    endpoint)
    CamelContext camelCtx = ctxBootStrap.getCamelContext();
    ProducerTemplate producerTemplate = camelCtx.createProducerTemplate();
    Status status = (Status) producerTemplate.sendBodyAndHeader("direct:tweets",
    ExchangePattern.InOut, tweet,
    "jobAnnouncementId", jobAnnouncementId);
    [...]
    }
    Check files TwitterPostingCamelRoute.java and JobAnnouncementServiceImpl.java on https://github.com/plexiti/the-job-announcement-fox

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  55. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Apache Camel
    n FuseSource acquired by Red Hat about a year ago -->
    Apache Camel integration with the rest of Red Hat’s / JBoss’ product line
    n Supports many more protocols/applications:
    http://camel.apache.org/components.html
    n In 2.11 the integration with Java EE/CDI has improved quite a bit:
    http://camel.apache.org/cdi.html
    n The spring-integration component bridges Camel components and
    Spring Integration endpoints:
    http://camel.apache.org/springintegration.html
    53
    http://camel.apache.org

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  56. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    54
    Wrapping up

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  57. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    n In every moderate to complex software project:
    n The point is not to have a great model (or apply all the patterns),
    the point is to ship software!
    55
    BPMN 2.0 and EIP Patterns
    *”The Duct Tape Programmer” by Joel Spolsky: http://www.joelonsoftware.com/items/2009/09/23.html

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  58. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    n In every moderate to complex software project:
    n The point is not to have a great model (or apply all the patterns),
    the point is to ship software!
    55
    [T]here are known knowns; there are things we know that we know.
    There are known unknowns; that is to say there are things that, we now know we don't know.
    But there are also unknown unknowns – there are things we do not know we don't know.
    --- United States Secretary of Defense, Donald Rumsfeld
    BPMN 2.0 and EIP Patterns
    *”The Duct Tape Programmer” by Joel Spolsky: http://www.joelonsoftware.com/items/2009/09/23.html

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  59. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    n In every moderate to complex software project:
    n The point is not to have a great model (or apply all the patterns),
    the point is to ship software!
    55
    [T]here are known knowns; there are things we know that we know.
    There are known unknowns; that is to say there are things that, we now know we don't know.
    But there are also unknown unknowns – there are things we do not know we don't know.
    --- United States Secretary of Defense, Donald Rumsfeld
    BPMN 2.0 and EIP Patterns
    “At the end of the day, ship the fucking thing! It’s great to rewrite your code and make it cleaner
    and by the third time it’ll actually be pretty. But that’s not the point—you’re not here to write
    code; you’re here to ship products.”
    --- Jamie Zawinski*
    *”The Duct Tape Programmer” by Joel Spolsky: http://www.joelonsoftware.com/items/2009/09/23.html

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  60. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Wrapping up
    n The first electronic general-purpose digital computer: the ENIAC (1946)
    56
    Text
    Source: http://en.wikipedia.org/wiki/ENIAC
    Who complained about
    bean wiring?!

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  61. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    How are you feeling?
    n I do hope not like this!
    57
    From the movie: “Spies Like Us” by John Landis. 1985.

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  62. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Discussion? Yes, please!
    58

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  63. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    Would you like to know more?
    n “WSO2Con 2011 - Enterprise Integration Patterns: Past, Present and Future” by
    Gregor Hohpe: http://www.youtube.com/watch?v=Xwi1DU6KoQ4
    n Enterprise Integration Patterns Website: http://www.eaipatterns.com
    n “Enterprise Integration Patterns” DRAFT article by Gregor Hohpe
    http://www.eaipatterns.com/docs/Enterprise%20Integration%20Patterns%20-%20PLoP%20Final%20Draft%203.pdf
    n Spring Integration reference documentation:
    http://static.springsource.org/spring-integration/reference/htmlsingle/
    n Spring Integration samples GitHub project:
    https://github.com/SpringSource/spring-integration-samples
    n “Practical Tips and Tricks with Spring Integration” by Oleg Zhurakousky
    http://www.youtube.com/watch?v=RY6dNUL8k6o
    59

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  64. DevFest 2012 – November 10th 2012 | Vienna
    plexiti · pragmatic software productions
    Answers to Discussion Questions
    n Q: “Do I need all THAT XML to configure Spring Integration?!”
    A: No. Check the Café Sample Application how to use annotations:
    https://github.com/SpringSource/spring-integration-samples/tree/master/applications/cafe
    A: Also check the Spring Integration Scala DSL
    http://blog.springsource.org/2012/03/05/introducing-spring-integration-scala-dsl/
    A: Also check the Spring Integration Groovy DSL
    http://blog.springsource.org/2012/11/06/a-groovy-dsl-for-spring-integration/
    60

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  65. BarcelonaJUG – April 22rd 2013 | Barcelona
    Appetizers of Enterprise Integration Patterns
    61
    Thanks!
    Rafael Cordones, [email protected]
    BarcelonaJUG, April 22rd, 2013, Barcelona
    @rafacm

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