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<title>Building a Stock Quoter with TAO - A Tutorial</title>
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<h3>Implementing Quoter Components with DAnCE<br /></h3>We
discuss this section after the PICML modeling only because we
would like to focus our attention more on the modeling stage. It
does not indicate that the implementation of components has to be
subsequent to the work we've done under GME. They are totally
orthogonal to each other. In fact, they are so orthogonal
that we won't go into details as to how DAnCE programming should
be done. We'll briefly go through the functionality of each
component and provides the links to their implementations
respectively. For a hands on experience on DAnCE programming,
please refer to $CIAO_ROOT/examples/Hello.<br />
<br />
<big><big><small>Broker Component<br />
</small></big></big> The Broker component
waits to be notified by the Distributor component about stock
changes. When a stock change event arrives, it will go back
to Distributor component and retrieve the information it interest
in and output them to the console. The users are allowed to
subscribe to the interested stock value through the interface
supported by Broker component. Here's the complete version of
<a href="../Quoter/Simple/Broker/Broker_exec.h">Broker_exec.h</a>
and <a href=
"../Quoter/Simple/Broker/Broker_exec.cpp">Broker_exec.cpp</a>.<br />
<br />
<big><big><small>Distributor Component<br />
</small></big></big> The Distributor component
monitors the real time stock database and publishes events
whenever it detects stock change. In our program, we use a
ACE_Task to simulate this real-life activity. The task
will run in a separate thread and periodically increment the
stock value by 1. In the same time the stock value is
incremented, an <span style=
"font-style: italic;">StockName</span> event along with the name
of the changed stock will be sent. Here's the complete version of
<a href=
"../Quoter/Simple/Distributor/Distributor_exec.h">Distributor_exec.h</a>
and <a href=
"../Quoter/Simple/Distributor/Distributor_exec.cpp">Distributor_exec.cpp</a><br />
<big><big><small><br />
Broker client<br />
</small></big></big> The Broker client program
is the driver program for client to control Broker component,
subscribe and unsubscribe to a specific stock. Here's the
complete version of <a href=
"../Quoter/Simple/Broker/Broker.cpp">Broker.cpp</a><br />
<br /><big><big><small>
Distributor client</small></big></big><br />
The Distributor
client program is the driver program for client to control
Distributor component, turn on and off the distribution service,
set up the frequency, etc. Here's the complete version of
<a href="../Quoter/Simple/Distributor/Distributor.cpp">Distributor.cpp</a>
<a name="2" /><br />
<br /><br />
<address>
<a href="mailto:ming.xiong@vanderbilt.edu">Ming Xiong<br /></a>
</address><!-- Created: Sat Nov 27 15:25:06 CST 1999 -->
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