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<?xml version="1.0" encoding="utf-8"?>
<!--
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
-->
<section>
<title>
WCF
</title>
<section role="h1" id="WCF-Introduction">
<title>
Introduction
</title>
<para>
WCF (<emphasis>Windows Communication Foundation)</emphasis> unifies the .Net
communication capabilities into a single, common, general Web
service oriented framework. A good WCF tutorial can be found
<ulink url="http://www.netfxharmonics.com/2008/11/Understanding-WCF-Services-in-Silverlight-2#WCFSilverlightIntroduction">here</ulink>.
</para>
<para>
WCF separates how service logic is written from how services
communicate with clients. Bindings are used to specify the
transport, encoding, and protocol details required for clients
and services to communicate with each other. Qpid provide a WCF
binding: org.apache.qpid.wcf.model.QpidBinding. WCF Services that
use the Qpid binding communicate through queues that are
dynamically created on a Qpid broker.
</para>
<!--h1-->
</section>
<section role="h1" id="WCF-HowtouseQpidbinding">
<title>
How to use Qpid binding
</title>
<para>
WCF services are implemented using:
</para>
<itemizedlist>
<listitem>
<para>A service contract with one or more operation contracts.
</para>
</listitem>
<listitem>
<para>A service implementation for those contracts.
</para>
</listitem>
<listitem>
<para>A configuration file to provide that implementation with an
endpoint and a binding for that specific contract.
</para>
</listitem>
</itemizedlist>
<para>
The following configuration file can be used to configure a Hello
Service:
</para>
<programlisting>
<configuration>
<system.serviceModel>
<services>
<!-- the service class -->
<service name="org.apache.qpid.wcf.demo.HelloService">
<host>
<baseAddresses>
<!-- Use SOAP over AMQP -->
<add baseAddress="soap.amqp:///" />
</baseAddresses>
</host>
<endpoint
address="Hello"
<!-- We use a Qpid Binding, see below def -->
binding="customBinding"
bindingConfiguration="QpidBinding"
<!-- The service contract -->
contract="org.apache.qpid.wcf.demo.IHelloContract"/>
</service>
</services>
<bindings>
<customBinding>
<!-- cf def of the qpid binding -->
<binding name="QpidBinding">
<textMessageEncoding />
<!-- specify the host and port number of the broker -->
<QpidTransport
host="192.168.1.14"
port="5673" />
</binding>
</customBinding>
</bindings>
<extensions>
<bindingElementExtensions>
<!-- use Qpid binding element: org.apache.qpid.wcf.model.QpidTransportElement -->
<add
name="QpidTransport"
type="org.apache.qpid.wcf.model.QpidTransportElement, qpidWCFModel"/>
</bindingElementExtensions>
</extensions>
</system.serviceModel>
</configuration>
</programlisting>
<para>
Endpoints and bindings can also be set within the service code:
</para>
<programlisting>
/* set HostName, portNumber and MyService accordingly */
Binding binding = new QpidBinding("HostName", portNumber);
ServiceHost service = new ServiceHost(typeof(MyService), new Uri("soap.amqp:///"));
service.AddServiceEndpoint(typeof(IBooking), binding, "MyService");
service.Open();
....
</programlisting>
<!--h1-->
</section>
</section>
|
