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Bringing a Legacy Java
Application to 2015
PT JUG - 23 Abril 2015
João Carvalho
Chief Software Architect - FenixEdu
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What is FenixEdu?
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Software Development
Advanced CS/SDE Training
Improve Técnico Lisboa
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Software Development
Advanced CS/SDE Training
Improve Técnico Lisboa
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Advanced CS/SDE Training
Software Development
Improve Técnico Lisboa
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Advanced CS/SDE Training
Improve Técnico Lisboa
Software Development
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Academic Learning
Drive Gears
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The platform for your
organization
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2015
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2015
2014
2013
2012
2011
2010
2009
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2002 2008
2007
2006
2005
2004
2003
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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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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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http://android-france.fr/2012/03/14/google-play-developpeurs-impayes/angry-developer/
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Development was
too slow
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https://www.openhub.net/p/fenixedu/analyses/latest/languages_summary
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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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Domain Modelling
Language
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DML
• Declarative language to reify rich domain models
• Java-like syntax
• jOOQ-style code generation
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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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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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Relations
relation SystemUsers {
protected Bennu playsRole bennu {
multiplicity 1..1;
}
protected User playsRole user {
multiplicity *;
}
}
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OJB XML ! DML
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Persistent Software
Transactional Memory
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Database-like
transactions…
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… only in memory!
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atomic {
origin.withdraw(100);
destination.deposit(100);
}
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atomic(() -> {
origin.withdraw(100);
destination.deposit(100);
});
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STM Properties
• Strict Object Equality
• Simplified transaction control
• Stronger correctness guarantees
• No locking!
• Conflict-free reads
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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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https://www.openhub.net/p/fenixedu/analyses/latest/languages_summary
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Fast Growth
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User
Person
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1.2M LoC
1350 Entities
1800 Relations
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• Long Compilation Times
• Large Memory Requirements
• Poor expandability
• Poor encapsulation
• Easy to break domain constraints
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Modularization
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• Separation of Concerns
• Better Abstractions
• Encapsulation
• Independent Roadmaps
• Development process improvements
• Reusability
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Challenges
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Monolithic application
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Monolithic environment
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New Mindset
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New Technologies
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Build System
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Modular Fenix Framework
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Infrastructure Extraction
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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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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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Bennu Scheduling
• Similar to Quartz Scheduler
• Standard Cron-Style tasks
• Ability to execute custom code on the running
application
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Bennu Extensions
• Full OAuth2 server support
• Nashorn support
• Common Spring/JAX-RS argument converters
• Configurable Exception Handling
• Modular Application Bootstrap
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UI Evolution
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Struts 1
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Early Attempts
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public class FindSpacesDA extends DispatchAction {
}
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@Mapping(module = "public", path = "/findSpaces")
@Forward(name = "listFoundSpaces", path = "/public/spaces/
findSpaces.jsp")
public class FindSpacesDA extends DispatchAction {
}
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Renderers Framework
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No Struts can last
forever…
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UI Framework Revolution
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Over 3000 distinct
interfaces
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How to make them work
together?
While keeping a consistent design across the application?
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Bennu Portal
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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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Functionalities only
render their body
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• 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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Contact Us
http://fenixedu.org/dev
github.com/fenixedu
facebook.com/fenixedu
[email protected]
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Bringing a Legacy Java
Application to 2015
PT JUG - 23 Abril 2015
João Carvalho
Chief Software Architect - FenixEdu