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Efficient Single SOAP Update Operation Proposal

This proposal suggests a single method to update any field or child object in SOAP, minimizing bandwidth abuse and code redundancy. Implementation includes Java Persistence API and Reflection.

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Efficient Single SOAP Update Operation Proposal

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  1. Single SOAP Update Operation CS526 George E. Turner Spring 2009

  2. George Turner CS526 Current Implementation • Four standard methods used to manipulate complex types in SOAP • Create • Read • Update • Delete

  3. George Turner CS526 • The Update method is extremely inefficient • Comparison to current data to determine “What’s changed?” • Bandwidth is abused when only updating a single field “Why send data that isn’t different?” • Requires a separate method for every field “Additional code to support each new method”

  4. George Turner CS526 Proposal • Create a single update method to update ANY field or child object <xs:complexType> <xs:sequence> <xs:element name="className" type="xs:QName"/> <xs:element name="xpathValue" type="xs:string"/> <xs:any/> </xs:sequence> </xs:complexType>

  5. George Turner CS526 • The QNameclassname value defines what is being updated • Fully qualified description of the top level object • Example: shop:ShoppingCart (namespace:localPart) • The String xpathValue defines the keys to distinguish the part to update • key=value[<,key=value>…][ / attribute:key=value[<,attribute:key=value>…]] • Example: id=12345/Item:id=3

  6. George Turner CS526 • The any is the new value, ANY valid XML • Example: <shop:MeatItem>Pork</shop:MeatItem> • Full SOAP Example <soapenv:Envelopexmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:urn="urn:UpdateService:Operations" xmlns:shop="urn:UpdateService:Shopping"> <soapenv:Header/> <soapenv:Body> <urn:update> <urn:className>shop:ShoppingCart</urn:className> <urn:xpathValue>id=12345/Item:id=3</urn:xpathValue> <shop:MeatItem>Pork</shop:MeatItem> </urn:update> </soapenv:Body> </soapenv:Envelope>

  7. George Turner CS526 • This solution uses a combination of • Java Persistence API (JPA) • Java Reflection • Modifications to generated JAXB classes @XmlRegistry public class ObjectFactory { private final static QName _ShoppingCart_QNAME = new QName("urn:UpdateService:Shopping", "ShoppingCart"); private final static QName _OrderItem_QNAME = new QName("urn:UpdateService:Shopping", "OrderItem");

  8. George Turner CS526 New Code private static final Map<QName, Class> QNAME_CLASS_MAP; static { Map<QName, Class> tmp = new HashMap<QName, Class>(2); tmp.put(_ShoppingCart_QNAME, ShoppingCartType.class); tmp.put(_OrderItem_QNAME, OrderItemType.class); QNAME_CLASS_MAP = Collections.unmodifiableMap(tmp); } public Class getClass(QNameqname) { return QNAME_CLASS_MAP.get(qname); }

  9. George Turner CS526 Conclusion • This prototype is not the final solution • A Document Object Model solution may be easier • Changes to the generated JAXB classes are required • Submission to W3C for acceptance and inclusion into milestone releases and specification

  10. George Turner CS526 References: • JAXB – Reference Implementation – http://jaxb.dev.java.net • JAXWS – Reference Implementation – http://jaxws.dev.java.net • METRO – Reference Implementation – http://metro.dev.java.net • JPA - Persistence API - http://java.sun.com/javaee/technologies/persistence.jsp

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