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<div id="ConfluenceContent"><h2 id="JAXWSDispatchAPI-UsageModes">Usage Modes</h2>
<h3 id="JAXWSDispatchAPI-Overview">Overview</h3>
<p><code>Dispatch</code> objects have two <em>usage modes</em>:</p>
<ul><li>Message mode</li><li>Message Payload mode (Payload mode)</li></ul>
<p>The usage mode you specify for a <code>Dispatch</code> object determines the amount of detail is passed to the user level code.</p>
<h3 id="JAXWSDispatchAPI-Messagemode">Message mode</h3>
<p>In <em>message mode</em>, a <code>Dispatch</code> object works with complete messages. A complete message includes any binding specific headers and wrappers. For example, a consumer interacting with a service that requires SOAP messages would need to provide the <code>Dispatch</code> object's <code>invoke()</code> method a fully specified SOAP message. The <code>invoke()</code> method will also return a fully specified SOAP message. The consumer code is responsible for completing and reading the SOAP message's headers and the SOAP message's envelope information.</p>
<div class="confluence-information-macro confluence-information-macro-tip"><span class="aui-icon aui-icon-small aui-iconfont-approve confluence-information-macro-icon"></span><div class="confluence-information-macro-body">
<p>Message mode is not ideal when you wish to work with JAXB objects.</p></div></div>
<p>You specify that a <code>Dispatch</code> object uses message mode by providing the value <code>java.xml.ws.Service.Mode.MESSAGE</code> when creating the Dispatch object.</p>
<h3 id="JAXWSDispatchAPI-Payloadmode">Payload mode</h3>
<p>In <em>payload mode</em>, also called message payload mode, a <code>Dispatch</code> object works with only the payload of a message. For example, a <code>Dispatch</code> object working in payload mode works only with the body of a SOAP message. The binding layer processes any binding level wrappers and headers. When a result is returned from <code>invoke()</code> the binding level wrappers and headers are already striped away and only the body of the message is left.</p>
<div class="confluence-information-macro confluence-information-macro-tip"><span class="aui-icon aui-icon-small aui-iconfont-approve confluence-information-macro-icon"></span><div class="confluence-information-macro-body">
<p>When working with a binding that does not use special wrappers, such as the XML binding, payload mode and message mode provide the same results.</p></div></div>
<p>You specify that a <code>Dispatch</code> object uses payload mode by providing the value <code>java.xml.ws.Service.Mode.PAYLOAD</code> when creating the <code>Dispatch</code> object.</p>
<h2 id="JAXWSDispatchAPI-DataTypes">Data Types</h2>
<h3 id="JAXWSDispatchAPI-Overview.1">Overview</h3>
<p><code>Dispatch</code> objects, because they are low-level objects, are not optimized for using the same JAXB generated types as the higher level consumer APIs. <code>Dispatch</code> objects work with the following types of objects:</p>
<ul><li><code>javax.xml.transform.Source</code></li><li><code>javax.xml.soap.SOAPMessage</code></li><li><code>javax.activation.DataSource</code></li><li>JAXB</li></ul>
<h3 id="JAXWSDispatchAPI-UsingSourceobjects">Using <code>Source</code> objects</h3>
<p>A <code>Dispatch</code> object can accept and return objects that are derived from the <code>javax.xml.transform.Source</code> interface. Source objects are low level objects that hold XML documents. Each <code>Source</code> implementation provides methods that access the stored XML documents and manipulate its contents. The following objects implement the <code>Source</code> interface:</p>
<ul><li><code>DOMSource</code></li><li><code>SAXSource</code></li><li><code>StreamSource</code>
<div class="confluence-information-macro confluence-information-macro-information"><span class="aui-icon aui-icon-small aui-iconfont-info confluence-information-macro-icon"></span><div class="confluence-information-macro-body">
<p>When using <code>Source</code> objects the developer is responsible for ensuring that all required binding specific wrappers are added to the message. For example, when interacting with a service expecting SOAP messages, the developer must ensure that the required SOAP envelope is added to the outgoing request and that the SOAP envelope's contents are correct.</p></div></div></li></ul>
<h3 id="JAXWSDispatchAPI-UsingSOAPMessageobjects">Using <code>SOAPMessage</code> objects</h3>
<p><code>Dispatch</code> objects can use <code>javax.xml.soap.SOAPMessage</code> objects when the following conditions are true:</p>
<ul><li>the <code>Dispatch</code> object is using the SOAP binding.</li><li>the <code>Dispatch</code> object is using message mode.</li></ul>
<h3 id="JAXWSDispatchAPI-UsingDataSourceobjects">Using <code>DataSource</code> objects</h3>
<p><code>Dispatch</code> objects can use objects that implement the <code>javax.activation.DataSource</code> interface when the following conditions are true:</p>
<ul><li>the <code>Dispatch</code> object is using the HTTP binding.</li><li>the <code>Dispatch</code> object is using message mode.</li></ul>
<p><code>DataSource</code> objects provide a mechanism for working with MIME typed data from a variety of sources including URLs, files, and byte arrays.</p>
<h3 id="JAXWSDispatchAPI-UsingJAXBobjects">Using JAXB objects</h3>
<p>While <code>Dispatch</code> objects are intended to be low level API that allows you to work with raw messages, they also allow you to work with JAXB objects. To work with JAXB objects a <code>Dispatch</code> object must be passed a <code>JAXBContext</code> that knows how to marshal and unmarshal the JAXB objects in use. The <code>JAXBContext</code> is passed when the <code>Dispatch</code> object is created.</p>
<p>You can pass any JAXB object understood by the <code>JAXBContext</code> object as the parameter to the <code>invoke()</code> method. You can also cast the returned message into any JAXB object understood by the <code>JAXBContext</code> object.</p>
<h2 id="JAXWSDispatchAPI-WorkingwithDispatchObjects">Working with <code>Dispatch</code> Objects</h2>
<h3 id="JAXWSDispatchAPI-Procedure">Procedure</h3>
<p>To use a Dispatch object to invoke a remote service you do the following:</p>
<ol><li>Create a <code>Dispatch</code> object.</li><li>Construct a request message.</li><li>Call the proper <code>invoke()</code> method.</li><li>Parse the response message.</li></ol>
<h3 id="JAXWSDispatchAPI-CreatingaDispatchobject">Creating a <code>Dispatch</code> object</h3>
<p>To create a <code>Dispatch</code> object do the following:</p>
<ol><li>Create a <code>Service</code> object to represent the <code>wsdl:service</code> element defining the service on which the <code>Dispatch</code> object will make invocations.</li><li>Create the <code>Dispatch</code> object using the <code>Service</code> object's <code>createDispatch()</code> method.
<div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
<pre class="brush: java; gutter: false; theme: Default">
public Dispatch&lt;T&gt; createDispatch(QName portName, java.lang.Class&lt;T&gt; type, Service.Mode mode)
throws WebServiceException;
</pre>
</div></div>
<div class="confluence-information-macro confluence-information-macro-note"><span class="aui-icon aui-icon-small aui-iconfont-warning confluence-information-macro-icon"></span><div class="confluence-information-macro-body">
<p>If you are using JAXB objects the method signature for <code>createDispatch()</code> is:</p>
<div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
<pre class="brush: java; gutter: false; theme: Default">
public Dispatch&lt;T&gt; createDispatch(QName portName, javax.xml.bind.JAXBContext context, Service.Mode mode)
throws WebServiceException;
</pre>
</div></div></div></div></li></ol>
<p>The following table describes the parameters for <code>createDispatch()</code>.</p>
<div class="table-wrap"><table class="confluenceTable"><tbody><tr><th colspan="1" rowspan="1" class="confluenceTh"><p> Parameter </p></th><th colspan="1" rowspan="1" class="confluenceTh"><p> Description </p></th></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p> portName </p></td><td colspan="1" rowspan="1" class="confluenceTd"><p> Specifies the QName of the <code>wsdl:port</code> element that represent the service provider on which the <code>Dispatch</code> object will make invocations. </p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p> type </p></td><td colspan="1" rowspan="1" class="confluenceTd"><p> Specifies the data type of the objects used by the <code>Dispatch</code> object. </p></td></tr><tr><td colspan="1" rowspan="1" class="confluenceTd"><p> mode </p></td><td colspan="1" rowspan="1" class="confluenceTd"><p> Specifies the usage mode for the <code>Dispatch</code> object. </p></td></tr></tbody></table></div>
<p>The code below creates a <code>Dispatch</code> object that works with <code>DOMSource</code> objects in payload mode.</p>
<div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
<pre class="brush: java; gutter: false; theme: Default">
package com.mycompany.demo;
import javax.xml.namespace.QName;
import javax.xml.ws.Service;
public class Client {
public static void main(String args[]) {
QName serviceName = new QName("http://org.apache.cxf", "stockQuoteReporter");
Service s = Service.create(serviceName);
QName portName = new QName("http://org.apache.cxf", "stockQuoteReporterPort");
Dispatch&lt;DOMSource&gt; dispatch = s.createDispatch(portName,
DOMSource.class,
Service.Mode.PAYLOAD);
...
}
}
</pre>
</div></div>
<h3 id="JAXWSDispatchAPI-Constructingrequestmessages">Constructing request messages</h3>
<p>When working with <code>Dispatch</code> objects requests must be built from scratch. The developer is responsible for ensuring that the messages passed to a <code>Dispatch</code> object match a request that the targeted service provider can process. This requires precise knowledge about the messages used by the service provider and what, if any, header information it requires.</p>
<p>This information can be provided by a WSDL document or an XMLSchema document that defines the messages. While service providers vary greatly there are a few guidelines that can be followed:</p>
<ul><li>The root element of the request is based in the value of the name attribute of the <code>wsdl:operation</code> element that corresponds to the operation being invoked.
<div class="confluence-information-macro confluence-information-macro-warning"><span class="aui-icon aui-icon-small aui-iconfont-error confluence-information-macro-icon"></span><div class="confluence-information-macro-body">
<p>If the service being invoked uses doc/literal bare messages, the root element of the request will be based on the value of name attribute of the <code>wsdl:part</code> element refered to by the <code>wsdl:operation</code> element.</p></div></div></li><li>The root element of the request will be namespace qualified.</li><li>If the service being invoked uses rpc/literal messages, the top-level elements in the request will not be namespace qualified.
<div class="confluence-information-macro confluence-information-macro-information"><span class="aui-icon aui-icon-small aui-iconfont-info confluence-information-macro-icon"></span><div class="confluence-information-macro-body">
<p>The children of top-level elements may be namespace qualified. To be certain you will need to check their schema definitions.</p></div></div></li><li>If the service being invoked uses rpc/literal messages, none of the top-level elements can be null.</li><li>If the service being invoked uses doc/literal messages, the schema definition of the message determines if any of the elements are namespace qualified.</li></ul>
<p>For more information about how services use XML messages see the WS-I Basic Profile.</p>
<h3 id="JAXWSDispatchAPI-Synchronousinvocation">Synchronous invocation</h3>
<p>For consumers that make synchronous invocations that generate a response, you use the <code>Dispatch</code> object's <code>invoke()</code> method shown bellow.</p>
<div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
<pre class="brush: java; gutter: false; theme: Default">
T invoke(T msg) throws WebServiceException;
</pre>
</div></div>
<p>The type of both the response and the request passed to the <code>invoke()</code> method are determined when the Dispatch object is created. For example if you created a <code>Dispatch</code> object using <code>createDispatch(portName, SOAPMessage.class, Service.Mode.MESSAGE)</code> the response and the request would both be <code>SOAPMessage</code> objects.</p>
<div class="confluence-information-macro confluence-information-macro-note"><span class="aui-icon aui-icon-small aui-iconfont-warning confluence-information-macro-icon"></span><div class="confluence-information-macro-body">
<p>When using JAXB objects, the response and the request can be of any type the provided <code>JAXBContext</code> object can marshal and unmarshal. Also, the response and the request can be different JAXB objects.</p></div></div>
<p>The code bellow makes a synchronous invocation on a remote service using a <code>DOMSource</code> object.</p>
<div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
<pre class="brush: java; gutter: false; theme: Default">
// Creating a DOMSource Object for the request
DocumentBuilder db = DocumentBuilderFactory.newDocumentBuilder();
Document requestDoc = db.newDocument();
Element root = requestDoc.createElementNS("http://org.apache.cxf/stockExample", "getStockPrice");
root.setNodeValue("DOW");
DOMSource request = new DOMSource(requestDoc);
// Dispatch disp created previously
DOMSource response = disp.invoke(request);
</pre>
</div></div>
<h4 id="JAXWSDispatchAPI-Asynchronousinvocation">Asynchronous invocation</h4>
<p><code>Dispatch</code> objects also support asynchronous invocations. As with the higher level asynchronous APIs discussed in Chapter 4, <code>Dispatch</code> objects can use both the polling approach and the callback approach.</p>
<p>When using the polling approach the <code>invokeAsync()</code> method returns a <code>Response&lt;t&gt;</code> object that can be periodically polled to see if the response has arrived.</p>
<div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
<pre class="brush: java; gutter: false; theme: Default">
Response &lt;T&gt; invokeAsync(T msg) throws WebServiceException;
</pre>
</div></div>
<p>When using the callback approach the <code>invokeAsync()</code> method takes an <code>AsyncHandler</code> implementation that processes the response when it is returned.</p>
<div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
<pre class="brush: java; gutter: false; theme: Default">
Future&lt;?&gt; invokeAsync(T msg, AsyncHandler&lt;T&gt; handler) throws WebServiceException;
</pre>
</div></div>
<div class="confluence-information-macro confluence-information-macro-note"><span class="aui-icon aui-icon-small aui-iconfont-warning confluence-information-macro-icon"></span><div class="confluence-information-macro-body">
<p>As with the synchronous <code>invoke()</code> method, the type of the response and the type of the request are determined when you create the <code>Dispatch</code> object.</p></div></div>
<h4 id="JAXWSDispatchAPI-Onewayinvocation">Oneway invocation</h4>
<p>When a request does not generate a response, you make remote invocations using the <code>Dispatch</code> object's <code>invokeOneWay()</code>.</p>
<div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
<pre class="brush: java; gutter: false; theme: Default">
void invokeOneWay(T msg) throws WebServiceException;
</pre>
</div></div>
<p>The type of object used to package the request is determined when the <code>Dispatch</code> object is created. For example if the <code>Dispatch</code> object is created using <code>createDispatch(portName, DOMSource.class, Service.Mode.PAYLOAD)</code> the request would be packaged into a <code>DOMSource</code> object.</p>
<div class="confluence-information-macro confluence-information-macro-note"><span class="aui-icon aui-icon-small aui-iconfont-warning confluence-information-macro-icon"></span><div class="confluence-information-macro-body">
<p>When using JAXB objects, the response and the request can be of any type the provided <code>JAXBContext</code> object can marshal and unmarshal. Also, the response and the request can be different JAXB objects.</p></div></div>
<p>The code bellow makes a one way invocation on a remote service using a JAXB object.</p>
<div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
<pre class="brush: java; gutter: false; theme: Default">
// Creating a JAXBContext and an Unmarshaller for the request
JAXBContext jbc = JAXBContext.newInstance("com.mycompany.StockExample");
Unmarshaller u = jbc.createUnmarshaller();
// Read the request from disk
File rf = new File("request.xml");
GetStockPrice request = (GetStockPrice)u.unmarshal(rf);
// Dispatch disp created previously
disp.invokeOneWay(request);
</pre>
</div></div>
<h4 id="JAXWSDispatchAPI-OperationDetermination">Operation Determination</h4>
<p>When using a <code>Dispatch</code> client with a WSDL file, the operation name will be set under one of the following cases.</p>
<ul><li>The&#160;javax.xml.ws.handler.MessageContext.WSDL_OPERATION property of the request context is set with the operation QName.</li><li>The addressing feature is enabled (in the bus or at the endpoint) and there is a matching operation to the payload element.</li><li>The "<span style="color: rgb(34,34,34);">find.dispatch.operation" property of the request context is set to Boolean.TRUE and there is a matching operation to the payload element. This property is not set by default.</span><span style="color: rgb(34,34,34);">Determining the correct operation will affect the processing such as setting the correct SOAPAction or WS-Addressing's Action.</span></li></ul></div>
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