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38.3. Generating the Stub Code
Overview
The asynchronous style of invocation requires extra stub code for the dedicated asynchronous methods defined on the SEI. This special stub code is not generated by default. To switch on the asynchronous feature and generate the requisite stub code, you must use the mapping customization feature from the WSDL 2.0 specification.
Customization enables you to modify the way the Maven code generation plug-in generates stub code. In particular, it enables you to modify the WSDL-to-Java mapping and to switch on certain features. Here, customization is used to switch on the asynchronous invocation feature. Customizations are specified using a binding declaration, which you define using a
jaxws:bindings tag (where the jaxws prefix is tied to the http://java.sun.com/xml/ns/jaxws namespace). There are two ways of specifying a binding declaration:
- External Binding Declaration
- When using an external binding declaration the
jaxws:bindingselement is defined in a file separate from the WSDL contract. You specify the location of the binding declaration file to code generator when you generate the stub code. - Embedded Binding Declaration
- When using an embedded binding declaration you embed the
jaxws:bindingselement directly in a WSDL contract, treating it as a WSDL extension. In this case, the settings injaxws:bindingsapply only to the immediate parent element.
Using an external binding declaration
The template for a binding declaration file that switches on asynchronous invocations is shown in Example 38.2, “Template for an Asynchronous Binding Declaration”.
Example 38.2. Template for an Asynchronous Binding Declaration
<bindings xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
wsdlLocation="AffectedWSDL"
xmlns="http://java.sun.com/xml/ns/jaxws">
<bindings node="AffectedNode">
<enableAsyncMapping>true</enableAsyncMapping>
</bindings>
</bindings>
Where AffectedWSDL specifies the URL of the WSDL contract that is affected by this binding declaration. The AffectedNode is an XPath value that specifies which node (or nodes) from the WSDL contract are affected by this binding declaration. You can set AffectedNode to
wsdl:definitions, if you want the entire WSDL contract to be affected. The jaxws:enableAsyncMapping element is set to true to enable the asynchronous invocation feature.
For example, if you want to generate asynchronous methods only for the
GreeterAsync interface, you can specify <bindings node="wsdl:definitions/wsdl:portType[@name='GreeterAsync']"> in the preceding binding declaration.
Assuming that the binding declaration is stored in a file,
async_binding.xml, you would set up your POM as shown in Example 38.3, “Consumer Code Generation”.
Example 38.3. Consumer Code Generation
<plugin>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-codegen-plugin</artifactId>
<version>${cxf.version}</version>
<executions>
<execution>
<id>generate-sources</id>
<phase>generate-sources</phase>
<configuration>
<sourceRoot>outputDir</sourceRoot>
<wsdlOptions>
<wsdlOption>
<wsdl>hello_world.wsdl</wsdl>
<extraargs>
<extraarg>-client</extraarg>
<extraarg>-b async_binding.xml</extraarg>
</extraargs>
</wsdlOption>
</wsdlOptions>
</configuration>
<goals>
<goal>wsdl2java</goal>
</goals>
</execution>
</executions>
</plugin>
The
-b option tells the code generator where to locate the external binding file.
For more information on the code generator see Section E.2, “cxf-codegen-plugin”.
Using an embedded binding declaration
You can also embed the binding customization directly into the WSDL document defining the service by placing the
jaxws:bindings element and its associated jaxws:enableAsynchMapping child directly into the WSDL. You also must add a namespace declaration for the jaxws prefix.
Example 38.4, “WSDL with Embedded Binding Declaration for Asynchronous Mapping” shows a WSDL file with an embedded binding declaration that activates the asynchronous mapping for an operation.
Example 38.4. WSDL with Embedded Binding Declaration for Asynchronous Mapping
<wsdl:definitions xmlns="http://schemas.xmlsoap.org/wsdl/"
...
xmlns:jaxws="http://java.sun.com/xml/ns/jaxws"
...>
...
<wsdl:portType name="GreeterAsync">
<wsdl:operation name="greetMeSometime">
<jaxws:bindings>
<jaxws:enableAsyncMapping>true</jaxws:enableAsyncMapping>
</jaxws:bindings>
<wsdl:input name="greetMeSometimeRequest"
message="tns:greetMeSometimeRequest"/>
<wsdl:output name="greetMeSometimeResponse"
message="tns:greetMeSometimeResponse"/>
</wsdl:operation>
</wsdl:portType>
...
</wsdl:definitions>
When embedding the binding declaration into the WSDL document you can control the scope affected by the declaration by changing where you place the declaration. When the declaration is placed as a child of the
wsdl:definitions element the code generator creates asynchronous methods for all of the operations defined in the WSDL document. If it is placed as a child of a wsdl:portType element the code generator creates asynchronous methods for all of the operations defined in the interface. If it is placed as a child of a wsdl:operation element the code generator creates asynchronous methods for only that operation.
It is not necessary to pass any special options to the code generator when using embedded declarations. The code generator will recognize them and act accordingly.
Generated interface
After generating the stub code in this way, the
GreeterAsync SEI (in the file GreeterAsync.java) is defined as shown in Example 38.5, “Service Endpoint Interface with Methods for Asynchronous Invocations”.
Example 38.5. Service Endpoint Interface with Methods for Asynchronous Invocations
package org.apache.hello_world_async_soap_http;
import org.apache.hello_world_async_soap_http.types.GreetMeSometimeResponse;
...
public interface GreeterAsync
{
public Future<?> greetMeSometimeAsync(
java.lang.String requestType,
AsyncHandler<GreetMeSometimeResponse> asyncHandler
);
public Response<GreetMeSometimeResponse> greetMeSometimeAsync(
java.lang.String requestType
);
public java.lang.String greetMeSometime(
java.lang.String requestType
);
}
In addition to the usual synchronous method,
greetMeSometime(), two asynchronous methods are also generated for the greetMeSometime operation:
