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|
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<body>
<h3>Tuscany BigBank Sample Application</h3>
<h4>Overview</h4>
<p>The Tuscany BigBank sample application shows using
the Tuscany SCA runtime to build a financial application.
There are two modules: webclient provides the front-end user
interface and account provides the back-end business services.
These are deployed as separate web applications</p>
<h4>Location</h4>
<p>This sample is located in the
<a href=".">samples\applications\bigbank</a> directory. There are two
subdirectories in that for the two modules <a href="account"
target="_blank">account</a> and <a href="webclient" target=
"_blank">webclient.</a></p>
<h4>Prerequisites</h4>
<p>Obtain the following prerequisites and install according to
their documentation.</p>
<ul>
<li><a href="http://java.sun.com/javase/downloads/index.jsp"
target="_blank">JDK 5.0</a></li>
<li><a href="http://maven.apache.org/download.html" target=
"_blank">Maven 2.0.4</a></li>
<li><a href="http://tomcat.apache.org/download-55.cgi" target=
"_blank">Apache Tomcat 5.xx</a> latest version binary core
distribution. </li>
</ul>
<h4><a name="Building" id="Building"></a>Building</h4>
<p>This sample
can be built from the bigbank directory using Maven 2.0.4 with
the following command:</p>
<p>
<code> mvn<br></code>
</p>
<h4>Setup</h4>
<p>If you have enabled remote deployment in Tomcat by
adding the line:<br>
<code> <user username="admin" password=""
roles="manager"/></code><br>
into <span style="font-style: italic;"><tomcat
dir></span>\conf\tomcat-users.xml you can deploy the
WARs to Tomcat using the tomcat-maven-plugin:<br>
<code>mvn tomcat:deploy</code></p>
<p>Alternatively you can copy the WAR files to Tomcat's
webapps directory.<br>
<code>copy account\target\sample-bigbank-account.war <span style=
"font-style: italic;"><tomcat dir></span>\webapps</code><br>
<code>copy
webclient\target\sample-bigbank-webclient.war <span style=
"font-style: italic;"><tomcat dir></span>\webapps</code><br>
</p>
<h4>Running</h4>
<p>Once you've started your web server, use your web
browser to view the following URL <a href=
"http://localhost:8080/sample-bigbank-webclient/" target=
"_blank">http://localhost:8080/sample-bigbank-webclient/</a><br>
You can either use an already pre configured account with
<span style="font-weight: bold;">Login</span> as <span style=
"color: rgb(204, 0, 0); font-weight: bold;">test</span> and
<span style="font-weight: bold;">Password</span> as <span style=
"color: rgb(204, 0, 0); font-weight: bold;">password,</span> or
you can create a new account.<br>
The demo is first configured to use a local mock stock quote
service that returns random stock data. If you want to use
an actual stock quote provider follow these steps:</p>
<ul>
<li>Stop your server by issuing in the <span style=
"font-style: italic;"><tomcat dir></span><span style=
"font-weight: bold;">\bin</span> directory</li>
<li>Issue <span style="font-weight: bold;">shutdown</span>
command to stop your web application server<span style=
"font-weight: bold;">.</span></li>
<li>Edit the account SCDL file <span style=
"font-style: italic;"><tomcat dir></span><span style=
"font-weight: bold;">\webapps\sample-bigbank-account\WEB-INF\default.scdl</span></li>
<li>Change the SCDL wiring to remove the mock stock quote
service by commenting it out as follows:<br>
<!--<br>
<component
name="StockQuoteServiceComponent"><br>
<implementation.java
class="bigbank.account.services.stockquote.StockQuoteServiceImpl"
/><br>
</component><br>
--></li>
<li>Uncomment the real stockquote service section in lines 68
to 80.<br></li>
<li>Change to the directory <span style=
"font-weight: bold;">apache-tomcat-5.5.17\bin </span></li>
<li>issue <span style="font-weight: bold;">startup
</span> command to start up the server in the
<span style="font-style: italic;"><tomcat dir></span>\bin
directory<span style="font-weight: bold;">.</span></li>
</ul>
<p>The sample should now be using the real stock quote
provider. </p>
<h4>Summary</h4><p>This example illustrates using Tuscany runtime
in building a financial Web application using SCA programing
model. The following key concepts are covered:</p>
<ul>
<li><b><i>Component implementations</i></b>. that provide web
based HTML user interface</li>
<li><b><i>Component implementations</i></b> that provide
<b><i>local services</i></b> in Java. Local services implement
internal application business logic such as tracking user state
and are not exposed remotely.</li>
<li><b><i>Component implementations</i></b> that have
<b><i>configuration properties</i></b> and <b><i>service
references</i></b> to other services</li>
<li><b><i>Components</i></b> that use and
<b><i>configure</i></b> <b><i>the properties and
references</i></b> of component implementations</li>
<li><b><i>SCA Services</i></b> to publish remotable services
via a <b><i>Web Service binding</i></b>.</li>
<li><b><i>SCA References </i></b> to consume remotable
services via a <b><i>Web Service binding</i></b></li>
<li>Assembling implementation, components, entry points and
external service into composite components.</li>
<li>Creating a module and all of its artifacts as part of a
<b><i>web application</i></b> to show a front-end access to SCA
services</li>
<li>The use of Data Access services to persist and retrieve
Service Data Objects from Apache Derby.</li>
<li style="text-align: left;">The use of existing Web
services in SCA.</li>
</ul><p>BigBank sample provides the following user services: account
balance, making deposits and withdrawals to purchase
and sell stock, and to view current stock value.<br>
The sample is organized into two SCA modules: webclient and
account. The webclient module functionality is to provide user
information and obtain user input. The account module is used to
retrieve and store user information, account information, current
stock information and the purchasing and selling of stock. The
two modules interact via web services through SCA references and
services.</p>
<br>
<div style="text-align: center;">
<img style="width: 381px; height: 169px;" alt=
"Overview of modules." title="Overview of modules." src=
"docs/modualoverview.png" align="middle">
<h5>Webclient</h5><br>
<a href=
"javascript:expandImage('docs/Show.Image.html?url=webclientmodule.png',1000,1100)">
<img style="width: 300px; height: 200px;" alt="Webclient files"
title="Click to expand" src="docs/webclientmodule.png"></a><br>
<p> </p>
<table style="text-align: left; width: 100%;" border="0"
cellpadding="1" cellspacing="0" width="100%">
<tbody>
<tr>
<td align="left" valign="top" width="*">
<a href=
"javascript:expandImage('docs/Show.Image.html?url=webclientfiles.png',850,500)">
<img style="width: 262px; height: 360px;" alt=
"Webclient files" title="Click to expand" src=
"docs/webclientfiles.png"></a> <br>
<div style="text-align: center;">
<small><span style="font-style: italic;">click to
enlarge</span></small>
</div>
</td>
<td style="text-align: left;" align="left" valign="top"
width="80%">
<table style="text-align: left; width: 100%;" border=
"0" cellpadding="1" cellspacing="0">
<tbody>
<tr>
<td style="text-align: center;" colspan="3">
<span style=
"font-weight: bold; text-decoration: underline;">Java
source files implementing SCA components and
interfaces.</span></td>
</tr>
<tr>
<td style="width: 10%;">
AccountServiceComponentImpl.java</td>
<td> </td>
<td>Implements the account service.</td>
</tr>
<tr>
<td>AccountLoginServiceImpl.java</td>
<td></td>
<td>Implements the Login service.</td>
</tr>
<tr>
<td>LoginService.java</td>
<td></td>
<td>Interface for a services provided by a
login service component.</td>
</tr>
<tr>
<td>ProfileService.java</td>
<td></td>
<td>Interface for a service provided by a profile
component.</td>
</tr>
<tr>
<td>ProfileServiceImpl.java</td>
<td></td>
<td>Implements the profile component.</td>
</tr>
<tr>
<td>SimpleLoginServiceImpl.java</td>
<td></td>
<td>A simple in memory login service.</td>
</tr>
<tr>
<td style="text-align: center;" colspan="3">
<span style=
"font-weight: bold; text-decoration: underline;">Java
source files implementing Web HTML
interface.</span></td>
</tr>
<tr>
<td>AccountStatusTag.java</td>
<td></td>
<td>Implements a jsp tag that displays the
account information</td>
</tr>
<tr>
<td>StockStatusTag.java</td>
<td></td>
<td>Implements a jsp tag that displays the stock
information.</td>
</tr>
<tr>
<td>LoginBarrierTag.java</td>
<td></td>
<td>Implements a jsp tag that ensures the user is
logged in.</td>
</tr>
<tr>
<td>ServiceTag.java</td>
<td></td>
<td>Places an SCA service in the JSP page
context.</td>
</tr>
<tr>
<td>FormServlet.java</td>
<td></td>
<td>Process user input and uses the
AccountService component.</td>
</tr>
<tr>
<td>LoginServlet.java</td>
<td></td>
<td>Processes logging in and logout.</td>
</tr>
<tr>
<td style="text-align: center;" colspan="3">
<span style=
"font-weight: bold; text-decoration: underline;">Files
that will be loaded as resources along
classpath.</span></td>
</tr>
<tr>
<td>AccountService.wsdl</td>
<td></td>
<td>WSDL that defines the account
service.</td>
</tr>
<tr>
<td>bigbank-tags.tld</td>
<td></td>
<td>Defines the tag libs for the user
interface.</td>
</tr>
<tr align="center">
<td colspan="3"><span style=
"font-weight: bold; text-decoration: underline;">Files
located in WEB-INF directory.</span></td>
</tr>
<tr>
<td><a href="#SCDL">default.scdl</a></td>
<td></td>
<td>Application's SCA SCDL file.</td>
</tr>
<tr>
<td><a href="#Web.xml">web.xml</a></td>
<td></td>
<td>Application's web.xml file.</td>
</tr>
<tr align="center">
<td colspan="3"><span style=
"font-weight: bold; text-decoration: underline;">Generated
Files.</span></td>
</tr>
<tr>
<td>sdo source</td>
<td></td>
<td>Generated SDO. Created by <a href=
"#tuscany-sdo-plugin"><code><span style=
"font-weight: bold;">tuscany-sdo-plugin</span></code></a>
maven plugin.</td>
</tr>
<tr>
<td>wsdl2java-source</td>
<td></td>
<td>Generated SDO interface. Created by <a href=
"#tuscany-plugin-wsdl2java"><code><span style=
"font-weight: bold;">tuscany-plugin-wsdl2java</span></code></a>
maven plugin.</td>
</tr>
<tr align="center">
<td colspan="3"><span style=
"font-weight: bold; text-decoration: underline;">Build
files.</span></td>
</tr>
<tr>
<td><a href="#pom.xml">pom.xml</a></td>
<td></td>
<td>Maven build file.</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
<p> </p><!-- account -->
<h5>Account</h5><br>
<a href=
"javascript:expandImage('docs/Show.Image.html?url=accountmodule.png',830,1400)">
<img style="width: 300px; height: 200px;" alt="Account module"
title="Click to expand" src="docs/accountmodule.png"></a><br>
<p> </p>
<table style="text-align: left; width: 100%;" border="0"
cellpadding="1" cellspacing="0" width="100%">
<tbody>
<tr>
<td align="left" valign="top" width="*">
<a href=
"javascript:expandImage('docs/Show.Image.html?url=accountfiles.png',850,500)">
<img style="width: 262px; height: 360px;" alt=
"Webclient files" title="Click to expand" src=
"docs/accountfiles.png"></a> <br>
<div style="text-align: center;">
<small><span style="font-style: italic;">click to
enlarge</span></small>
</div>
</td>
<td style="text-align: left;" align="left" valign="top"
width="80%">
<table style="text-align: left; width: 100%;" border=
"0" cellpadding="1" cellspacing="0">
<tbody>
<tr>
<td style="text-align: center;" colspan="3">
<span style=
"font-weight: bold; text-decoration: underline;">Java
source files implementing SCA components and
interfaces.</span></td>
</tr>
<tr>
<td style="width: 10%;">
AccountServiceImpl.java</td>
<td> </td>
<td>Implements the account service
component.</td>
</tr>
<tr>
<td>AccountDataService.java</td>
<td></td>
<td>Interface defined for component implementing
an account's data service.</td>
</tr>
<tr>
<td>AccountDataServiceDASImpl.java</td>
<td></td>
<td>A Data Access Service (DAS) implementation of
of the Account Data Service.</td>
</tr>
<tr>
<td>AccountDataServiceImpl.java</td>
<td></td>
<td>A Data Service implementation not using
DAS.</td>
</tr>
<tr>
<td>AccountDBInit.java</td>
<td></td>
<td>A utility to just create the database and it
table and fill in some initial data.</td>
</tr>
<tr>
<td>StockQuote.java</td>
<td></td>
<td>A class to hold the StockQuote
information.</td>
</tr>
<tr>
<td>StockQuoteService.java</td>
<td></td>
<td>Interface defined for a component
implementing a stock quote service.</td>
</tr>
<tr>
<td>StockQuoteServiceImpl.java</td>
<td></td>
<td>Implements a fake stock quote service.</td>
</tr>
<tr>
<td>StockQuoteWebservicexServiceImpl.java</td>
<td></td>
<td>Implements an actual stock quote
service.</td>
</tr>
<tr>
<td style="text-align: center;" colspan="3">
<span style=
"font-weight: bold; text-decoration: underline;">Files
that will be loaded as resources along
classpath.</span></td>
</tr>
<tr>
<td>AccountService.wsdl</td>
<td></td>
<td>WSDL that defines the account
service</td>
</tr>
<tr>
<td>stockquotes.webservicex.wsdl</td>
<td></td>
<td>Actual stock quote service WSDL.</td>
</tr>
<tr>
<td><a href=
"#DAS_">DasAccountConfiguration.xml</a></td>
<td></td>
<td>Provides any needed configuration info
including datasource properties, table
definitions,</td>
</tr>
<tr align="center">
<td colspan="3"><span style=
"font-weight: bold; text-decoration: underline;">Files
located in WEB-INF directory.</span></td>
</tr>
<tr>
<td><a href="#SCDL">default.scdl</a></td>
<td></td>
<td>Application's SCA SCDL file.</td>
</tr>
<tr>
<td><a href="#Web.xml">web.xml</a></td>
<td></td>
<td>Application's web.xml file.</td>
</tr>
<tr align="center">
<td colspan="3"><span style=
"font-weight: bold; text-decoration: underline;">Generated
Files.</span></td>
</tr>
<tr>
<td>sdo source</td>
<td></td>
<td>Generated SDO. Created by <a href=
"#tuscany-sdo-plugin"><code><span style=
"font-weight: bold;">tuscany-sdo-plugin</span></code></a>
maven plugin.</td>
</tr>
<tr>
<td>wsdl2java-source</td>
<td></td>
<td>Generated SDO interface. Created
by <a href=
"#tuscany-plugin-wsdl2java"><code><span style=
"font-weight: bold;">tuscany-plugin-wsdl2java</span></code></a>
maven plugin.</td>
</tr>
<tr align="center">
<td colspan="3"><span style=
"font-weight: bold; text-decoration: underline;">Build
files.</span></td>
</tr>
<tr>
<td><a href="#pom.xml">pom.xml</a></td>
<td></td>
<td>Maven build file.</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</div><br>
<br>
<h5><a name="pom.xml" id="pom.xml"></a>Pom.xml</h5>
<p>The directions
for maven how to build the each module is located in
each module's directory in the pom.xml file. The
application uses Java 1.5 and thus in the build plugin
section needs the following compiler directives:</p>
<code>
<plugin><br>
<groupId>org.apache.maven.plugins</groupId><br>
<artifactId>maven-compiler-plugin</artifactId><br>
<configuration><br>
<source><span style=
"color: rgb(255, 0, 0); font-weight: bold;">1.5</span></source><br>
<target><span style=
"color: rgb(255, 0, 0); font-weight: bold;">1.5</span></target><br>
</configuration><br>
</plugin></code><br>
<p>Both webclient and account uses three maven
plugins: <code style=
"font-weight: bold;">tuscany-sdo-plugin</code>, <code style=
"font-weight: bold;">tuscany-plugin-wsdl2java</code>,
and <code style=
"font-weight: bold;">tuscany-war-plugin</code>.
The tuscany-sdo-plugin is provided by Tuscany 's SDO project
while the other two are provided by the Tuscany SCA project.</p>
<p>The <code style="font-weight: bold;"><a name="tuscany-sdo-plugin"
id="tuscany-sdo-plugin"></a>tuscany-sdo-plugin</code>
references the WSDL's schema and generates all the files
located in target/sdo_source directory. The application
uses these classes as a databinding instead of having to deal
directly with XML that represents form as defined in the
WSDL's schema.</p>
<p>The <code style="font-weight: bold;"><a name=
"tuscany-plugin-wsdl2java" id=
"tuscany-plugin-wsdl2java"></a>tuscany-plugin-wsdl2java</code>
plugin generates a Java interface in the target/wsdl2java-source
directory that is used to define the inteface (prottype) in the
wsdl.</p>
<p>The <code style="font-weight: bold;">tuscany-war-plugin</code> is
used to add both the Tuscany runtime and any Tuscany
extensions required by the application in the war file.. Looking
at the pom.xml and search for "<code style=
"font-weight: bold;">tuscany-war-plugin"</code> you'll find the
plugin. Which extension you want loaded are specified in
the <code><span style=
"font-weight: bold;">extensions</span></code> section. The format
for this closely follows Maven's artifact naming. The
boolean <code><span style=
"font-weight: bold;">loadExtensionDependencies</span></code>
option if true will resolve all dependencies for each
extension listed here and also include them in the war file.
<br>
<br>
<h4>Application</h4>
<h5><a name="Web.xml" id="Web.xml"></a>Web.xml</h5><p>The web.xml
file in each module adds necessary "hooks" to initiate and
maintain the Tuscany SCA runtime in a web application host.<br>
</p>
<table style="text-align: left; width: 100%;" border="1"
cellpadding="2" cellspacing="2">
<tbody>
<tr>
<td>
<pre>
<small><listener><br>
<listener-class>org.apache.tuscany.runtime.webapp.TuscanyContextListener</listener-class><br>
</listener></small>
</pre>
</td>
<td>This class initializes the Tuscany runtime when the
applications is started and helps finalize the Tuscany
runtime when the application has ended.</td>
</tr>
<tr>
<td>
<pre>
<small><servlet><br>
<servlet-name>TuscanyServlet</servlet-name><br>
<display-name>Tuscany Servlet</display-name><br>
<servlet-class>org.apache.tuscany.runtime.webapp.TuscanyServlet</servlet-class><br>
</servlet></small>
</pre>
</td>
<td>This class provides the web applications servlet
interface to SCA components. The Axis websevices
binding extension requires this.</td>
</tr>
<tr>
<td>
<pre>
<small><listener><br>
<listener-class>org.apache.tuscany.runtime.webapp.TuscanySessionListener</listener-class><br>
</listener></small>
</pre>
</td>
<td>This listener helps provide SCA session support .</td>
</tr>
</tbody>
</table><br>
<p>The web application can be run in offline or online when
resolving dependencies required by the application or it's
required extensions. This is configured in the web.xml with the
context-param element with a parameter name <code><span style=
"font-weight: bold;">tuscany.online</span></code>. If not
specified or set to true, dependencies are resolved by searching
the local war repository, the local Maven repository, and remote
repositories. If specified and set to false, the remote
repositories will not be searched.</p>
<h5><a name="SCDL" id="SCDL"></a>SCDL</h5>
<p>Each module's SCA
application SCDL is located in the web application
WEB-INF/default.scdl file. This is the default location,
but within the web.xml it is possible to override this with a
context-param element with the name <code><span style=
"font-weight: bold;">tuscany.applicationScdlPath</span></code>.
The Tuscany System SCDL can also be overridden with another
context-param element with the name <code><span style=
"font-weight: bold;">tuscany.systemScdlPath</span></code>.<br>
The SCDL used by the BigBank application is defined by
<a href=
"http://www.osoa.org/download/attachments/35/SCA_AssemblyModel_V096.pdf?version=1"
target="_blank">SCA Assembly Model V0.96</a> , <a href=
"http://www.osoa.org/download/attachments/35/SCA_ClientAndImplementationModelforJava_v0.95.pdf?version=3"
target="_blank">SCA Client and Implementation Model for Java
(V0.95)</a> and the <a href=
"http://www.osoa.org/download/attachments/35/SCA_WebServiceBindings_V096-draft1.pdf?version=3"
target="_blank">SCA Web Service bindings</a> specifications.<br>
There is one extension to SCDL used by BigBank that is specific
to Tuscany that is used by SDO databinding extension.
The <code>import.sdo</code> element in the SCDL
specifies which SDO factories to register the SDO types.
In the case of BigBank the factory is the class generated
by the <code style=
"font-weight: bold;">tuscany-sdo-plugin</code> maven plugin. An
example of this follows:</p>
<pre>
<code><dbsdo:import.sdo xmlns:dbsdo="http://incubator.apache.org/tuscany/xmlns/databinding/sdo/1.0-incubator-M2"
factory="com.bigbank.account.AccountFactory"/> <br>
</code>
</pre>
<h5>Code</h5><p>The Java code for the most part just implements the
Web interface and the SCA components necessary to implement the
business logic. The code uses Java 5.0 annotations as documented
by the <a href=
"http://www.osoa.org/download/attachments/35/SCA_ClientAndImplementationModelforJava_v0.95.pdf?version=3"
target="_blank">SCA Client and Implementation Model for Java
(V0.95)</a> specifications. The samples uses one annotation that
is an Tuscany extension that is used by the databinding framework
to identify that the components expect to SDO s for complex data
types. An example of this is seen in the AccountService interface
which has the <code style=
"font-weight: bold;">@DataType(name="commonj.sdo.DataObject")</code>
annotation.</p>
<h4><a name="DAS_" id="DAS_"></a><span style=
"font-family: monospace;">RDB DAS</span></h4>
<p>The Relational Database DAS (RDB DAS) is used in this sample to access relational data in terms
of SDOs. All the code pertaining to this usage is contained to two one files:
AccountDataServiceDASImpl.java and DasAccountConfiguration.xml. The java file provides code that
instantiates and invokes the DAS and the XML file provides RDB DAS configuration.</p>
<p>The sample demonstrates a few of the RDB DAS capabilities including:</p>
<ul>
<li>reading a graph of SDOs based on a select query provided inline </li>
<li>reading a graph of SDOs based on a named select query defined in the config file </li>
<li>executing a named command to manually insert data</li>
<li>leveraging SDO Change Summary to by utilizing the DAS "applyChanges" method to flush graph modifications </li>
<li>utilizing the DAS column-converter framework </li>
<li>using the column/property name mapping (aliasing)</li>
</ul>
<p>This sample does not currently demonstrate a few other key DAS features including Object relationships, optimistic
concurrency control, and the use of convention over configuration. User level documentation for the RDB DAS can
be found in the <a href=
"http://wiki.apache.org/ws/Tuscany/TuscanyJava/DAS_Java_Overview/RDBDAS_Java_User_Guide"target="_blank">RDBDAS User's Guide</a>.
</p>
<p>This sample uses the RDB DAS as a utility. A future version of this sample will access the DAS as an SCA service.
</p>
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