Building HTML5 Applications with EclipseLink: JSON, JAX-RS, JPA & JavaScript

Transcription

1 Building HTML5 Applications with EclipseLink: JSON, JAX-RS, JPA & JavaScript Doug 1 Copyright 2011, Oracle and/or its affiliates. All rights reserved. Shaun Smith

2 Java Persistence: The Problem Space Customer id: int name: String creditrating: int Java JPA JAXB JSON-B <customer id= > <name> </name> </customer> { id= name = } XML JSON CUST ID NAME C_RATING Relational JPA: Java Persistence API JAXB: Java Architecture for XML Binding 2 Copyright 2011, Oracle and/or its affiliates. All rights reserved.

3 Software Evolution Computing architecture is constantly evolving: Mainframe, client/server, web/thin client, mobile/apps,... Current technologies with increasing adoption include: Cloud computing HTML 5 NoSQL databases Java EE 7 is evolving to address many of these new requirements EclipseLink JPA and JAXB are also evolving! 3 Copyright 2011, Oracle and/or its affiliates. All rights reserved.

4 New Features JSON Binding RESTful JPA JPA RS Dynamic Configuration Provisioning NoSQL Database Support Tenant Isolation 4 Copyright 2011, Oracle and/or its affiliates. All rights reserved.

5 JSON Binding / EclipseLink JSON-B Provides Java/JSON binding similar to EclipseLink JAXB s Java/XML binding. Marshall Java domain model to and from JSON Currently no Java standard EclipseLink interprets JAXB XML bindings for JSON Content-type selectable by setting property on Marshaller/Unmarshaller 5 Copyright 2011, Oracle and/or its affiliates. All rights reserved.

6 XML and JSON from JAXB Mappings XML JAXB mapped Java JSON 6 Copyright 2011, Oracle and/or its affiliates. All rights reserved.

7 RESTful JPA Provides a service that exposes JPA mapped entities over REST via JAX-RS HTTP message body either XML or JSON Client HTML 5 with JavaScript (primary focus) JavaFX 7 Copyright 2011, Oracle and/or its affiliates. All rights reserved.

8 JAX-RS with JPA High Level Architecture Client Java EE Server RDBMS HTTP/S JDBC 8 Copyright 2011, Oracle and/or its affiliates. All rights reserved.

9 JAX-RS with JPA Example GET Invoice public class InvoiceService {... public Invoice read(int id) { return null; }... 9 Copyright 2011, Oracle and/or its affiliates. All rights reserved.

10 JAX-RS with JPA Example GET public class InvoiceService {... public Invoice read(int id) { return entitymanager.find(invoice.class, id); } Copyright 2011, Oracle and/or its affiliates. All rights reserved.

11 JAX-RS with JPA Example public class InvoiceService {... public Invoice read(int id) { return entitymanager.find(invoice.class, id); } Copyright 2011, Oracle and/or its affiliates. All rights reserved.

12 JAX-RS with JPA Example public class public Invoice int id) { return entitymanager.find(invoice.class, id); } Copyright 2011, Oracle and/or its affiliates. All rights reserved.

13 JAX-RS with JPA Example public class @Produces({"application/xml", "application/json"}) public Invoice int id) { return entitymanager.find(invoice.class, id); } Copyright 2011, Oracle and/or its affiliates. All rights reserved.

14 JAX-RS with JPA Example public class @Produces({"application/xml", "application/json"}) public Invoice int id) { return entitymanager.find(invoice.class, id); } GET 14 Copyright 2011, Oracle and/or its affiliates. All rights reserved.

15 JAX-RS with JPA GET mapped to bean JAX-RS GET Invoice Bean Contract Bean Payment Bean Bean uses JPA Accounting PU Contracting PU Human Resources PU JPA 15 Copyright 2011, Oracle and/or its affiliates. All rights reserved.

16 JPA-RS Accounting PU GET JAX-RS JAX-RS mapped to JPA-RS service JPA-RS JPA-RS maps URI to Accounting PU and Invoice entity Contracting PU Human Resources PU... JPA 16 Copyright 2011, Oracle and/or its affiliates. All rights reserved.

17 REST Resource Mapping REST requires URIs for identifiable resources Resources not 1:1 with classes may be a graph of closely related objects Resources are connected via links Need a way to define Resource Model that can be leveraged by JAXB/JSON Binding 17 Copyright 2011, Oracle and/or its affiliates. All rights reserved.

18 Resource Model Maps Java Object Model to REST Resources Resource Model Object Model 19 Copyright 2011, Oracle and/or its affiliates. All rights reserved.

19 EclipseLink Resource Model In development Resources (sub-graphs of domain graph) can be marshalled and unmarshalled (and reconnected) Links are being automatically generated Currently requires use of JAXB annotations Future: simplify metadata declaration of resources 20 Copyright 2011, Oracle and/or its affiliates. All rights reserved.

20 Summary Java is evolving and EclipseLink is evolving too! JSON Binding JPA-RS REST Resource Mapping NoSQL Tenant Isolation EclipseLink is the center of innovation in Java persistence 21 Copyright 2011, Oracle and/or its affiliates. All rights reserved.