The application layer is responsible for driving the workflow of the application, matching the use cases at hand.

These operatios are interface-independent and can be both synchronous or message-driven.

This layer is well suited for spanning transactions, high-level logging and security.

The application layer is thin in terms of domain logic - it merely coordinates the domain

* {{{http://maven.apache.org}Maven}} 2.0.9 or later

Install the Maven plugin (<Tools> - <Plugins> - <Available Plugins>), then open project (it will appear as a project directory).

Eclipse embedded support for Maven is still a bit rocky in our experience, so these are instructions

for generating Eclipse project descriptor files using external Maven.

Unpack the source package, cd into the <<<dddsample>>> directory (where the <<<pom.xml>>> file is located) and

run the following command:

-------------------

mvn eclipse:eclipse

-------------------

This will download all external library dependencies and plugins, and will take about 5-10 minutes to complete

depending on you network conditions. It will also generate the files <<<.project>>> and <<<.classpath>>>,

which are Eclipse project descriptor files. When that process is done, you can open Eclipse and select

<File - Import>, <General - Existing projects into workspace>:

[images/eclipse1.png]

As project root directory, select the unpacked <<<dddsample>>> directory:

[images/eclipse2.png]

Now the project is up and running, except that all library references are relative to the <<<M2_REPO>>> classpath variable,

so you will see a large list of unresolved references:

[images/eclipse3.png]

To define that variable, go to <Window - Preferences>, <Java - Build Path - Classpath variables>, <New>.

Set the name to <<<M2_REPO>>> and use the Folder button to browse to the correct location, which is:

*---------+------------------------------------------------------+

| Windows | C:\Documents and Settings\\<Username>\.m2\repository |

*---------+------------------------------------------------------+

| Mac | /Users/<Username>/.m2/repository |

*---------+------------------------------------------------------+

| Unix | /home/<Username>/.m2/repository |

*---------+------------------------------------------------------+

You should be promted to do a full project rebuild. Select yes. Now the project should compile and you

can right-click on the <<<src/test/java>>> folder and do a "Run as/JUnit Test".

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Here is a 10 minute screencast that shows the different interfaces in action,

and the scope of the application.

<p>It shows:</p>

<ul>

<li>The welcome page</li>

<li>Tracking the preloaded cargos</li>

<li>Viewing the preloaded cargos in the admin application</li>

<li>Booking of a new cargo</li>

<li>Routing of the new cargo</li>

<li>Registering of a few expected events for the new cargo,

then tracking to confirm it's on track</li>

<li>Registering of an unexpected event for the new cargo,

then tracking to see that it becomes misdirected</li>

<li>Registering event using the scheduled file import interface</li>

</ul>

<p>

It's a little difficult to read the text, but you can use it as a guide for

playing around on your own with the actual application.</p>

<p>

<em>The recording was made using <a href="http://www.shinywhitebox.com/ishowuhd/main.html">IShowU HD</a>.</em>

</p>