Bringing a Legacy Java Application to 2015

Transcript

1. Bringing a Legacy Java
   Application to 2015
   PT JUG - 23 Abril 2015
   João Carvalho
   Chief Software Architect - FenixEdu
   

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2. What is FenixEdu?
   

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3. Software Development
   Advanced CS/SDE Training
   Improve Técnico Lisboa
   

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4. Software Development
   Advanced CS/SDE Training
   Improve Técnico Lisboa
   

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5. Advanced CS/SDE Training
   Software Development
   Improve Técnico Lisboa
   

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6. Advanced CS/SDE Training
   Improve Técnico Lisboa
   Software Development
   

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7. Academic Learning
   Drive Gears
   

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8. The platform for your
   organization
   

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11. 2002 2008
    2007
    2006
    2005
    2004
    2003
    

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13. Presentation Tier — Based on Struts
    Application Tier
    POJO’s
    Persistence Tier — Based on OJB
    XML Configuration
    Service Manager
    Services
    Filters
    XML
    Configuration
    DTO’s
    XML
    Configuration
    Data Repository
    JDBC
    JSP
    Views
    Actions
    SQL Statements
    

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15. A new feature in 11 simple steps
    1. Create a POJO to represent the domain object
    2. Write the SQL schema to store the domain object
    3. Write the xml configuration to map the POJO against the SQL schema
    4. Write SQL statements for custom reading of the domain object (in case something other than a read by ID or a
    read all was necessary)
    5. Create data transfer objects for passing information to the presentation tier
    6. Write services at the application level for creating, reading, updating and deleting the domain object
    7. Write access control filters to limit who can invoke services
    8. Write service and filter configurations in a xml file
    9. Create JSP views for presenting information to the users
    10. Write Actions to handle user requests
    11. Configure struts xml files to specify the application flow
    

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16. http://android-france.fr/2012/03/14/google-play-developpeurs-impayes/angry-developer/
    

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17. Development was
    too slow
    

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18. https://www.openhub.net/p/fenixedu/analyses/latest/languages_summary
    

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19. Modularity
    Native Java ORM
    Highly Consistent
    Persistent STM
    Multiple Persistency Backends Transaction Management
    Consistency Predicates
    Transaction Introspection
    Lifecycle Events
    JSON Support
    Domain Introspection
    Opacity Isolation
    Conflict-free Reads
    In-Memory
    Fenix Framework
    

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20. Domain Modelling
    Language
    

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21. DML
    • Declarative language to reify rich domain models
    • Java-like syntax
    • jOOQ-style code generation
    

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22. Classes
    public class User {
    protected String username (REQUIRED);
    protected String password;
    protected String salt;
    protected DateTime created;
    public LocalDate expiration;
    public String email;
    public Locale preferredLocale;
    }
    domain.dml
    

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23. Custom Types
    valueType java.util.Locale as Locale {
    externalizeWith {
    String toLanguageTag();
    }
    internalizeWith forLanguageTag();
    }
    OR
    valueType java.util.Locale as JsonLocale {
    externalizeWith {
    String getLanguage();
    String getCountry();
    }
    }
    

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24. Relations
    relation SystemUsers {
    protected Bennu playsRole bennu {
    multiplicity 1..1;
    }
    protected User playsRole user {
    multiplicity *;
    }
    }
    

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25. OJB XML ! DML
    

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26. Persistent Software
    Transactional Memory
    

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27. Database-like
    transactions…
    

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28. … only in memory!
    

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29. atomic {
    origin.withdraw(100);
    destination.deposit(100);
    }
    

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30. atomic(() -> {
    origin.withdraw(100);
    destination.deposit(100);
    });
    

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31. STM Properties
    • Strict Object Equality
    • Simplified transaction control
    • Stronger correctness guarantees
    • No locking!
    • Conflict-free reads
    

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32. Presentation Tier — Based on Struts
    Application Tier
    Persistence Tier — Fenix Framework Based
    Service Manager
    Services
    Filters
    XML
    Configuration
    Domain
    Objects
    XML
    Configuration
    Data Repository
    JDBC
    JSP
    Views
    Actions
    DML Configuration
    

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33. https://www.openhub.net/p/fenixedu/analyses/latest/languages_summary
    

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34. Fast Growth
    

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35. User
    Person
    

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36. 1.2M LoC
    1350 Entities
    1800 Relations
    

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37. • Long Compilation Times
    • Large Memory Requirements
    • Poor expandability
    • Poor encapsulation
    • Easy to break domain constraints
    

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38. Modularization
    

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39. • Separation of Concerns
    • Better Abstractions
    • Encapsulation
    • Independent Roadmaps
    • Development process improvements
    • Reusability
    

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40. Challenges
    

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41. Monolithic application
    

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42. Monolithic environment
    

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43. New Mindset
    

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44. New Technologies
    

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45. Build System
    

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46. Modular Fenix Framework
    

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47. Infrastructure Extraction
    

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48. User Management
    Legacy technologies integration
    Spring
    Struts Faces
    Agnostic storage support
    Cron Tasks
    Runtime manual tasks
    Domain Browser
    Messaging
    Event driven programming Modular System
    Portal Runtime modifable Menu
    Themable
    Runtime configuration
    User authentication
    REST infrastructure
    Full OAuth Stack
    Transactional IO
    Indexing
    Searching
    Internationalization
    Client Toolkit
    Bootstrap
    Bennu
    Fine grain user groups
    JavaScript pluggability
    WebSockets
    Multi Language
    

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49. Bennu
    • Web framework for Fenix Framework-based applications
    • Application Configuration and monitoring (including full domain
    browser and analytics)
    • Security: user management, logins, groups
    • Localization support
    • Full JAX-RS Integration and JSON Support
    • Multi-backend File Storage
    

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50. Bennu Scheduling
    • Similar to Quartz Scheduler
    • Standard Cron-Style tasks
    • Ability to execute custom code on the running
    application
    

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51. Bennu Extensions
    • Full OAuth2 server support
    • Nashorn support
    • Common Spring/JAX-RS argument converters
    • Configurable Exception Handling
    • Modular Application Bootstrap
    

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52. UI Evolution
    

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53. Struts 1
    

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54. Early Attempts
    

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55. public class FindSpacesDA extends DispatchAction {
    }
    

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56. @Mapping(module = "public", path = "/findSpaces")
    @Forward(name = "listFoundSpaces", path = "/public/spaces/
    findSpaces.jsp")
    public class FindSpacesDA extends DispatchAction {
    }
    

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57. Renderers Framework
    

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58. No Struts can last
    forever…
    

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60. UI Framework Revolution
    

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62. Over 3000 distinct
    interfaces
    

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63. How to make them work
    together?
    While keeping a consistent design across the application?
    

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64. Bennu Portal
    

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65. Bennu Portal
    • UI Integration Framework
    • Uniform styling across the application
    • Dynamically configurable theme
    • Request Dispatcher/Router
    • Dynamic menu construction and rendering
    • Out-of-the-box scaffolding for web applications
    

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66. Functionalities only
    render their body
    

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68. • UI Code declares what functionalities it exposes
    • Dynamic model built from declared functionalities
    • Auto-injected theme with full menu
    • Easily support many presentation technologies
    

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70. Contact Us
    http://fenixedu.org/dev
    github.com/fenixedu
    facebook.com/fenixedu
    hello@fenixedu.org
    

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71. Bringing a Legacy Java
    Application to 2015
    PT JUG - 23 Abril 2015
    João Carvalho
    Chief Software Architect - FenixEdu
    

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