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From conflue...@apache.org
Subject [CONF] Apache CXF 2.0 Documentation: CXF Architecture (page edited)
Date Wed, 28 Nov 2007 15:13:00 GMT
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div.auto_complete {
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div.auto_complete ul li.selected {
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/******* Edit Page Styles *******/
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}

.toogleInfoDiv{
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.inputSection{
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#editBox{
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}

/******* Left Navigation Theme Styles ********/
.leftnav li a {
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/* Added by Shaun during i18n */
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.topPadding
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/* new form style */
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    -->
    </style>
</head>
<body>

<div id="PageContent">
<table class="pagecontent" border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
<td valign="top" class="pagebody">

    <div class="pageheader">
        <span class="pagetitle">
            Page Edited :
            <a href="http://cwiki.apache.org/confluence/display/CXF20DOC">CXF20DOC</a>
:
            <a href="http://cwiki.apache.org/confluence/display/CXF20DOC/CXF+Architecture">CXF
Architecture</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/CXF20DOC/CXF+Architecture">CXF
Architecture</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~elegoff">Eric
Le Goff</a>
            <span class="smallfont">(Nov 28, 2007)</span>.
     </p>
    
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=44806&originalVersion=4&revisedVersion=5">(View
changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><style type='text/css'>/*<![CDATA[*/
div.rbtoc1196262721138 {margin-left: 1.5em;padding: 0px;}
div.rbtoc1196262721138 ul {list-style: outline;margin-left: 0px;}
div.rbtoc1196262721138 li {margin-left: 0px;padding-left: 0px;}

/*]]>*/</style><div class='rbtoc1196262721138'>
<ul>
  <li><a href='#CXFArchitecture-Overview'>Overview</a></li>
  <li><a href='#CXFArchitecture-Bus'>Bus</a></li>
  <li><a href='#CXFArchitecture-Messaging%26Interceptors'>Messaging &amp;
Interceptors</a>
<ul>
  <li><a href='#CXFArchitecture-PhaseInterceptors'>Phase Interceptors</a></li>
  <li><a href='#CXFArchitecture-FaultHandling'>Fault Handling</a></li>
  <li><a href='#CXFArchitecture-Exchanges'>Exchanges</a></li>
  <li><a href='#CXFArchitecture-ReentrantInterceptorChains'>Reentrant InterceptorChains</a></li>
</ul></li>
  <li><a href='#CXFArchitecture-Transports'>Transports</a>
<ul>
  <li><a href='#CXFArchitecture-Conduits'>Conduits</a></li>
  <li><a href='#CXFArchitecture-Destinations'>Destinations</a></li>
</ul></li>
  <li><a href='#CXFArchitecture-TheServiceModel'>The Service Model</a></li>
  <li><a href='#CXFArchitecture-Bindings'>Bindings</a>
<ul>
  <li><a href='#CXFArchitecture-TheSoapBinding'>The Soap Binding</a></li>
  <li><a href='#CXFArchitecture-XMLBinding'>XML Binding</a></li>
</ul></li>
  <li><a href='#CXFArchitecture-Endpoints'>Endpoints</a></li>
  <li><a href='#CXFArchitecture-Frontends'>Front-ends</a>
<ul>
  <li><a href='#CXFArchitecture-JAXWS'>JAX-WS</a></li>
</ul></li>
  <li><a href='#CXFArchitecture-PuttingitallTogether'>Putting it all Together</a>
<ul>
  <li><a href='#CXFArchitecture-AJAXWSexample'>A JAX-WS example</a></li>
</ul></li>
</ul></div>

<h1><a name="CXFArchitecture-Overview"></a>Overview</h1>
<p>NOTE: this is work in progress.</p>

<p>CXF seeks to build the necessary infrastructure components for services. Goals for
CXF are many and include:</p>
<ul>
	<li>Support for different bindings, including SOAP, REST, and Corba.</li>
	<li>WS-&#42; support, including WS-Addressing, WS-Security, WS-ReliableMessaging,
and WS-Policy</li>
	<li>Support for multiple transports</li>
	<li>Pluggable Data-bindings</li>
	<li>Clean separation of front ends, like JAX-WS, from the core code.</li>
	<li>High Performance</li>
	<li>Embeddable</li>
</ul>


<p>The overall CXF architecture is primarily made up of the following parts:</p>
<ol>
	<li>Bus: This is the backbone of the CXF architecture.</li>
	<li>Messaging &amp; Interceptors: These provide the low level message and pipeline
layer upon which most functionality is built.</li>
	<li>Front ends: Frontends provide a programming model to create services (e.g. JAX-WS).</li>
	<li>Services: Services host a Service model which is a WSDL-like model which describes
the service.</li>
	<li>Bindings: Bindings provide the functionality to interpret the protocol (i.e. SOAP,
REST, Corba).</li>
	<li>Transports: Destinations and Conduits make up the transport abstraction that CXF
uses to achieve transport neutrality.</li>
</ol>


<p>We'll take a look at each layer in turn and examine how they work together.</p>

<h1><a name="CXFArchitecture-Bus"></a>Bus</h1>

<p>The bus is a provider of shared resources to the CXF runtime. Examples for such shared
resources are: wsdl managers, binding factory managers etc. The bus can easily be extended
to include your own custom resources or services, or you can replace default resources like
the HTTP destination factory (based on Jetty) with your own (possibly based on Tomcat).<br/>
This is made possible by dependency injection: the default bus implemenation is based on Spring,
which wires the runtime components together for you.<br/>
The SpringBusFactory searches for all bean configuration files  in the META-INF/cxf directories
on your classpath, and builds an application context from them. The bean configuration files
included in the application context construction are:</p>
<ul>
	<li>META-INF/cxf/cxf.xml (in cxf-rt-core only)</li>
	<li>META-INF/cxf/cxf-extension.xml (e.g. in cxf-rt-bindings-soap)</li>
	<li>META-INF/cxf/cxf-property-editors.xml (e.g. in cxf-rt-transports-http).</li>
</ul>



<p>See <a href="/confluence/display/CXF20DOC/Configuration+of+the+Bus" title="Configuration
of the Bus">Configuration of the Bus</a> for an example of how to customise the bus
by supplying your own bean configuration file and <a href="/confluence/display/CXF20DOC/Configuration+of+Runtime+Constructed+Objects"
title="Configuration of Runtime Constructed Objects">Configuration of Runtime Constructed
Objects</a> for more information on the special case of injecting into objects created
by the runtime (as opposed to objects created by the IOC container itself).</p>

<h1><a name="CXFArchitecture-Messaging%26Interceptors"></a>Messaging &amp;
Interceptors</h1>

<p>CXF is built on a generic messaging layer comprised of Messages, Interceptors, and
InterceptorChains. Interceptors are the fundamental unit of functionality. By dividing up
how messages are processed and sent, this gives CXF a very flexible architecture. It can be
reconfigured at any point in the processing. This also gives CXF the ability to pause &amp;
resume interceptor chains.  </p>

<p>Interceptors have a method, handleMessage, which allows them to act on the Message.These
Interceptors can then be built up into chains of interceptors, straightforwardly called InterceptorChains.
Some examples include:</p>
<ul>
	<li>An interceptor which parses just the headers of a SOAP message into DOM elements</li>
	<li>A WS-Security interceptor which decrypts or authenticates an incoming message.</li>
	<li>An outgoing data binding interceptor which serializes the result</li>
</ul>


<p>Interceptors are uni-directional and are inherently unaware of whether they are dealing
with a request, response, or fault.</p>

<h2><a name="CXFArchitecture-PhaseInterceptors"></a>Phase Interceptors</h2>

<p>CXF provides an InterceptorChain implementation called the PhaseInterceptorChain.
When Interceptors are added to the chain, they are grouped into ordered phases.&nbsp;
A PhaseInterceptor may provide guidance as to how it is to be ordered within the phase.</p>

<p>Let us take a hypothetical simplified example (NOTE: these phases and interceptors
don't necessarily exist in CXF). Let us say we are parsing a SOAP message. We may want to
have two phases. First, a dispatch phase which parses the soap headers and determines which
service to route the Message to. Second, an unmarshal phase which binds the SOAP body to JAXB
objects. In the first dispatch phase we could implement this via two interceptors, first a
ReadHeadersInterceptor which parses the headers and second a WS-AddressingInInterceptor which
determines which service we're invoking from the WS-Addressing header. In the second unmarshal
phase, we have just a single JAXBUnmarshallerIntercptor. Both the ReadHeadersInterceptor and
AddressingInInterceptor would tell the PhaseInterceptorChain they are in the "dispatch" phase
by returning "dispatch" when getPhase() is called. Additionally, the ReadHeadersInterceptor
could specify that it wants to run before the AddressingInInterceptor by returning the interceptor
id when Interceptor.getBefore() is called. </p>

<p>Before it was mentioned how chains were very dynamic and flexible. In our above example,
we could add interceptors specific to that service once it is resolved. Or we could pause
the chain once while we wait for some external chain, like an asynchronous service response.</p>

<h2><a name="CXFArchitecture-FaultHandling"></a>Fault Handling</h2>

<p>At any point during processing, an interceptor may throw a Fault, or a derivative
of a Fault like the SoapFault. This will cause the chain to stop invoking and unwind it. Unwinding
consists of calling handleFault on each interceptor that was invoked in reverse order.</p>

<p>InterceptorChains have the concept of a fault interceptor. Once the chain is unwound,
the fault interceptor is invoked with the message that caused the fault. The fault interceptor
may trigger a new chain which then invokes a specified set of interceptors meant to handle
faults.</p>

<h2><a name="CXFArchitecture-Exchanges"></a>Exchanges</h2>
<p>In addition to the concept of a Message, there is the concept of the Exchange. The
exchange class holds a references to  the in, out and fault messages for the current message
exchange. </p>

<p>It also holds properties specific to the exchange, and not just the message. For
instance the Exchange holds the Service that is current being invoked in it.</p>

<h2><a name="CXFArchitecture-ReentrantInterceptorChains"></a>Reentrant InterceptorChains</h2>

<p>An interesting feature of the PhaseInterceptorChain is that it is reentrant. This
can be powerful and slightly dangerous. This feature is only used in CXF during the sending
of an outgoing message, The SoapOutInterceptor is the best example: </p>
<div class="code"><div class="codeContent">
<pre class="code-java"><span class="code-keyword">public</span> void handleMessage(Message
m) {
  writeSoapEnvelopeStart();
  writeSoapBodyStart(); 

  <span class="code-comment">// invoke next interceptor, which writes the contents of
the SOAP Body
</span>  m.getInterceptorChain().doIntercept(m); 
  writeSoapBodyEnd();

  writeSoapEnvelopeEnd();
}</pre>
</div></div>

<h1><a name="CXFArchitecture-Transports"></a>Transports</h1>

<p>CXF includes its own transport abstraction layer to hide transport specific details
from the binding and front end layers.</p>

<h2><a name="CXFArchitecture-Conduits"></a>Conduits</h2>

<p>Conduits provide the basis for outgoing message sending. A Conduit is created from
a ConduitInitiator. Sending a message is a multistep pocess: </p>
<ol>
	<li>Call conduit.prepare(message): this starts the message sending. At this point a
Conduit may initiate a connection and set the OutputStream for the outgoing message.</li>
	<li>Writing of the actual message to the OutputStream</li>
	<li>Call to conduit.close(message): this closes and disposes of any existing  resources
for the message sending.<br/>
A message sender may also register a MessageObserver with the Conduit. If the Conduit is synchronous,
the MessageObserver will be notified once a response has been received.</li>
</ol>


<h2><a name="CXFArchitecture-Destinations"></a>Destinations</h2>

<p>Destinations are the basis for receiving incoming messages. A destination is created
from a DestinationFactory:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">DestinationFactoryManager dfManager = bus.getExtension(DestinationFactoryManager.class);

<span class="code-comment">// Find a DestinationFactory <span class="code-keyword">for</span>
the SOAP HTTP transport
</span>DestinationFactory df = dfManager.getDestinationFactory(<span class="code-quote">"http:<span
class="code-comment">//schemas.xmlsoap.org/wsdl/soap/http"</span>);
</span>
<span class="code-comment">// TODO: outline building of EndpointInfo
</span>EndpointInfo endpointInfo = ...;
Destination destination = df.getDestination(endpointInfo);</pre>
</div></div>

<p>MessageObservers can then be registered with Destinations. These listen for incoming
messages:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">MessageObserver myObserver = ...;
destination.setMessageObserver(myObserver);</pre>
</div></div>

<p>The most common MessageObserver used in CXF is the ChainInitiationObserver. This
takes the incoming message, creates a message Exchange &amp; PhaseInterceptorChain, then
starts the chain.</p>

<h1><a name="CXFArchitecture-TheServiceModel"></a>The Service Model</h1>

<p>The Service model is the representation of a service within CXF. It is made up of
two parts. First there is the ServiceInfo which contains a WSDL-like model of the service
and its operations, bindings, and endpoints. Second, there is the Service itself, which contains
the ServiceInfo, data-binding information, service interceptors, service properties, and more.</p>

<p>A service can be constructed from many different sources - Classes, WSDL 1.1, and
WSDL 2.0. Typically frontends are responsible for creating a service via ServiceFactorys.
These build up the service model and configure the service interceptors, databindings, etc.</p>

<p>The Service model itself is  contained in the ServiceInfo class. The hierarchy looks
roughly like so:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">ServiceInfo
+-Interface: InterfaceInfo
| +-Operations: Collection&lt;OperationInfo&gt;
| | +- Input: MessageInfo
| | +- Output: MessageInfo
| | +- Faults: Collection&lt;MessageInfo&gt;
+-Bindings: Collection&lt;BindingInfo&gt;
| +-Operations: Collection&lt;BindingOperationInfo&gt;
+-Endpoints: Collection&lt;EndpointInfo&gt;</pre>
</div></div>

<h1><a name="CXFArchitecture-Bindings"></a>Bindings</h1>

<p>Bindings provide ways to map concrete formats &amp; protocols on top of transports.
A binding contains two main parts, a BindingFactory and a Binding. A BindingFactory builds
a Binding from the service model's BindingInfo. The binding contains interceptors specific
to the binding and also implements the createMessage() method, which creates a Message implementation
specific for that binding.</p>

<h2><a name="CXFArchitecture-TheSoapBinding"></a>The Soap Binding</h2>
<p>The prototypical binding is SOAP.  It has its own Message class called the SoapMessage.
It adds the ability to hold the current SoapVersion and the headers for the message.</p>

<p>The Soap binding also adds a special type of interceptor called the SoapInterceptor.
The SoapInterceptor adds two methods to the Interceptor class:</p>
<div class="code"><div class="codeContent">
<pre class="code-java">Set&lt;URI&gt; getRoles();
Set&lt;QName&gt; getUnderstoodHeaders();</pre>
</div></div>
<p>These inform the SOAP interceptors as to what headers and roles the particular SOAP
interceptor understands.</p>

<p>It has many interceptors designed to handle SOAP messages:</p>
<ol>
	<li>StaxInInterceptor: Creates an XMLStreamReader from an incoming InputStream</li>
	<li>ReadHeadersInterceptor: Reads the headers into the SoapMessage</li>
	<li>MustUnderstandInterceptor: Checks the MustUnderstand attributes of all the headers
against all the SoapInterceptor's getUnderstoodHeaders method.</li>
	<li>SoapOutInterceptor:</li>
</ol>


<h2><a name="CXFArchitecture-XMLBinding"></a>XML Binding</h2>

<h1><a name="CXFArchitecture-Endpoints"></a>Endpoints</h1>

<h1><a name="CXFArchitecture-Frontends"></a>Front-ends</h1>

<p>Frontends provide a programming model to interact with CXF. The primary frontend
at the moment is JAX-WS. The JAX-WS implementation is cleanly separated from the rest of CXF
&#8211; like the bindings and core. They provide functionality through interceptors that
are added to Services and Endpoints.</p>

<h2><a name="CXFArchitecture-JAXWS"></a>JAX-WS</h2>

<h1><a name="CXFArchitecture-PuttingitallTogether"></a>Putting it all Together</h1>
<h2><a name="CXFArchitecture-AJAXWSexample"></a>A JAX-WS example</h2>
<p>Here's a small example of what might happen when we publish a service via the JAX-WS
Endpoint.publish() method.</p>

<ol>
	<li>Call to Endpoint.publish("http://localhost/service", myService)</li>
	<li>The EndpointImpl creates a Service from the myService object using the JaxWsServiceFactoryBean
using the class and/or WSDL</li>
	<li>An EndpointInfo is created for the Endpoint.publish URL</li>
	<li>A JaxWsEndpointImpl is created from the EndpointInfo. This contains the JAX-WS
endpoint specific interceptors</li>
	<li>The JaxWsEndpointImpl creates a Binding and Destination to listen on.</li>
</ol>
</div>


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