A JPA Framework for NoSQL Store
behind Integrated Collaboration
Object Model
Eric S. Chan
Object Model Architect
Oracle Corporation
Philip Y Bell
Collaboration Architect
Oracle corporation
Java Persistence API (JPA)
• JPA is primarily an object-relational mapping (ORM)
persistence framework (JSR-317 for JPA 2.0), based on popular
Hibernate and TopLink frameworks
• JPA co-exists with two other technologies
– Java Data Objects (JDO) to map Java to relational and nonrelational (object-oriented) data stores (JSR-243 for JDO
3.0)
– Service Data Objects (SDO) to abstract data in service
oriented architecture (SOA) (JSR-235 for Java binding)
• A mix of JPA, JDO, and SDO matches Microsoft ADO.NET Entity
Framework and Language Integrated Query (LINQ)
Why JPA over JDO or SDO?
• JPA was developed in part to unify JDO API and
the EJB 2.0 Container Managed Persistence
(CMP) API.
• JDO 3.0 includes interoperability with JPA
• SDO is language independent and backend
service-oriented
• An increasing number of application APIs are
based on JPA/JPQL (due to popularity of open
source and commercial offerings, including
Hibernate, TopLink, and OpenJPA)
JPA/JPQL for Not Only SQL
• An Extensible White Box Framework JPA/JPQL
can support NoSQL data sources
– RESTful Services (WebDAV, CalDAV, CardDAV)
– Web Services (BPEL, BPEL4People)
– Protocols (SMTP, IMAP, XMPP, LDAP)
– Java API’s (JDBC, JNDI, Java Mail, JAXB, etc.)
– JPA can be a front-end for JDO and SDO
Proof of Concept
• OpenICOM, a java.net incubation project for
Open Integrated Collaboration Platform
– http://java.net/projects/open-icom/pages/Home
• Leverage Canonical, Integrated, Standardized
Object Model
– http://docs.oasis-open.org/icom/icomics/v1.0/csprd01/icom-ics-v1.0-csprd01.html
• Support connectors for Oracle Beehive
Collaboration Server
OpenICOM JPA Framework
Open Integrated Collaboration Platform
• unifies application programming model
• integrates disparate domain models
– LDAP, JCR, IMAP, SMTP, XMPP, iCalendar, CalDAV,
WebDAV, vCard, FOAF, SIOC, Facebook Open Graph,
OpenSocial, BPMN, BPEL, BPEL4People, etc.
• interoperates with existing protocols/services
• lowers the barrier to create collaboration tools
that offer seamless user experience with minimal
context switching between activities
• transforms to/from RDF/OWL representations for
Semantic Web
Embodiment of Design Patterns
• delineation of managed and detached objects
• uniqueness of object identity per persistence
context
• software transaction memory
• eager and lazy loading of states
• attribute level change tracking
• cascade persist, merge
• persistence context and second-level caches
• object query language
OpenICOM Experience
• extend white-box JPA/JPQL framework with
– pluggable data access connectors for federated data sources
– standardized lightweight behavior in POJO classes to maintain one-tomany and many-to-many relationships in persistence cache
• support weaker consistency properties and partial availability in
partitioned networks
• combine single-entity ACID transaction properties with
compensating transaction or soft-state eventually consistent
transaction properties.
• actively maintain large caches of objects in persistence contexts by
time-to-live and/or least-recently-used policies
• avoid detaching transaction objects from persistence contexts
during transaction rollback, undo, or redo
References
[1] Open Integrated Collaboration Platform http://java.net/projects/openicom
[2] OpenICOM: A JPA Framework for Integrated Collaboration Environments,
Part 1 http://today.java.net/article/2011/03/21/openicom-jpa-frameworkintegrated-collaboration-environments-part-1
[3] OASIS ICOM Committee Specification Public Review Draft 01
http://docs.oasis-open.org/icom/icom-ics/v1.0/csprd01/icom-ics-v1.0csprd01.html
[4] Sample Groovy scripts for OpenICOM API for Oracle Beehive Server
http://java.net/projects/openicom/downloads/download/icomGroovy.tar.gz