A JAXB Complex Type in Java

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A JAXB Complex Type
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package combigbankmessage; import javaxxmlbindannotationXmlRootElement; @XmlRootElement public class LoanApplication { // }
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Perspective: Which Data Binding Should You Choose
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A common misperception is that SCA requires or mandates SDO as its data-binding technology In fact, SCA is data binding-agnostic and is intended to work equally well with JAXB, XmlBeans, and other like technologies Selecting a data-binding solution will often be constrained by the runtime, which may support only one or a limited number In cases where there is a choice, selection should be based on the requirements of an application JAXB is particularly well-suited for interacting with data in a strongly typed fashion, namely as Java types This is perhaps the most common development scenario, as
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component implementations are generally aware of the data types they will be manipulating in advance Other major advantages of JAXB are its relative simplicity and its capability to use plain Java Objects (POJOs) without the need to generate special marshaling classes When combined with SCA, JAXB provides a fairly transparent solution for marshaling data to and from XML For example, in the following extract, the JAXB LoanRequest and LoanResult objects can be unmarshaled and marshaled transparently by the SCA runtime:
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public class LoanComponent implements LoanService { // public LoanResult apply(LoanRequest request) { // process the request and invoke the credit service CustomerInfo info = requestgetCustomerInfo(); CreditServicecheckCredit(info); // continue processing to receive a result code LoanResult result = new LoanResult(); resultsetCode(code) return result; }
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A major disadvantage of JAXB is that although it provides strong support for startfrom-Java and start-from-schema development scenarios (that is, generating a schema for existing Java classes and generating Java classes from an existing schema, respectively), it does not handle meet-in-the-middle well The latter is important in situations where existing schemas must be reconciled with existing Java types Another feature lacking in JAXB is support for an API to dynamically access XML data In situations where a component may not statically know about the data types it will manipulate, SDO and XMLBeans provide a dynamic API for introspecting and accessing data A signi cant downside of SDO and XmlBeans is their current lack of support for starting with Java Both data-binding technologies require Java types to be generated from pre-existing schemas This introduces another step in the development process (generating the Java types) and slightly complicates application code as SDO and XmlBeans require generated types to be instantiated via factories In many cases, JAXB is a reasonable choice given its simplicity and reliance on POJOs However, application requirements may vary where SDO, XmlBeans, or an alternative technology are more appropriate Fortunately, SCA is not tied to a particular data-binding solution and can accommodate a number of different approaches to working with XML
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Coarse-Grained Services
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Pass-By-Value Parameters An important characteristic of remotable services is that operation parameters are pass-by-value, as opposed to pass-by-reference The main difference between the two types concerns visibility of operation parameters When pass-by-value parameters are modi ed by the component providing a service, they are not visible to the client When pass-by-reference parameters are modi ed by a component providing a service, they are visible to the client In Java, pass-by-reference means a reference to the same parameter object is shared by the client and service provider Pass-by-value generally entails copying parameters or enforcing a copy-on-write scheme that is, lazily copying when data is modi ed For example, the following example demonstrates the difference between pass-by-value and pass-by-reference:
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public class ClientImpl implements Client { public void execute() { Message message = new Message(); messagesetBody( hello ); serviceinvoke(message); Systemoutprintln(messagegetBody()); } } public class ServiceImpl implements Service { public void invoke(Message message) { messagesetBody( goodbye ); } }
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When pass-byvalue parameters are modi ed by the component providing a service, they are not visible to the client When pass-by-reference parameters are modi ed by a component providing a service, they are visible to the client
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In the preceding example, assume ServiceImpl takes enough time processing the message that the call to MessagesetBody() in Client is made before the call to Systemoutprintln() in ServiceImpl If the Service interface is marked with @Remotable, ServiceImpl will output: Message is hello However, if the Service interface is not marked with @Remotable, ServiceImpl will output: Message is goodbye In the case where ClientImpl and ServiceImpl are located in processes on different machines, pass-by-value is enforced as the parameters are marshaled from one process to the other (see Figure 36)
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