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<title>Event Domain Service</title>
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<a href="http://www.ericsson.com/technology/opensource/erlang"><img border="0" alt="[Ericsson AB]" src="min_head.gif"/></a>
</center><a name="4"><!-- Empty --></a>
<h2>4 Event Domain Service</h2>
<a name="4.1"><!-- Empty --></a>
<h3>4.1 Overview of the CosEventDomain Service</h3>
<p>The Event Domain service allows programmers to manage a cluster
of information channels.
</p><a name="4.1.1"><!-- Empty --></a>
<h4>4.1.1 Event Domain Service Components</h4>
<p>There are two components in the OMG CosEventDomainAdmin service architecture:
</p>
<ul>
<li>
<strong>EventDomainFactory:</strong> a factory for creating EventDomains.
</li>
<li>
<strong>EventDomain:</strong> supplies a tool, which makes it easy to create
topologies of interconnected channels (i.e. a directed graph).
</li>
</ul>
<a name="4.1.2"><!-- Empty --></a>
<h4>4.1.2 A Tutorial on How to Create a Simple Service</h4>
<p>To be able to use the cosEventDomain application, the cosNotification
and, possibly, the cosTime application must be installed.
</p><a name="4.1.3"><!-- Empty --></a>
<h4>4.1.3 How to Run Everything</h4>
<p>Below is a short transcript on how to run cosEventDomain.
</p>
<div class="example"><pre>
%% Start Mnesia and Orber
mnesia:delete_schema([node()]),
mnesia:create_schema([node()]),
orber:install([node()]),
mnesia:start(),
orber:start(),
%% Install and start cosNotification.
cosNotificationApp:install(),
cosNotificationApp:start(),
%% Install and start cosEventDomain.
cosEventDomainApp:install(),
cosEventDomainApp:start(),
%% Start a CosEventDomainAdmin factory.
AdminFac = cosEventDomainApp:start_factory(),
%% Define the desired QoS settings:
QoS =
[#'CosNotification_Property'
{name='CosEventDomainAdmin':'DiamondDetection'(),
value=any:create(orber_tc:short(),
'CosEventDomainAdmin':'AuthorizeDiamonds'())},
#'CosNotification_Property'
{name='CosEventDomainAdmin':'CycleDetection'(),
value=any:create(orber_tc:short(),
'CosEventDomainAdmin':'ForbidCycles'())}],
%% Create a new EventDomain:
{ED, EDId} = 'CosEventDomainAdmin_EventDomainFactory':
create_event_domain(Fac, QoS, []),
%% Now we can add Notification Channels to the Domain. How this
%% is done, see the cosNotification documentation. Let us assume
%% that we have gained access to two Channel Objects; add them to the
%% domain:
ID1 = 'CosEventDomainAdmin_EventDomain':add_channel(ED, Ch1),
ID2 = 'CosEventDomainAdmin_EventDomain':add_channel(ED, Ch2),
%% To connect them, we must first define a connection struct:
C1 = #'CosEventDomainAdmin_Connection'{supplier_id=ID1,
consumer_id=ID2,
ctype='STRUCTURED_EVENT',
notification_style='Pull'},
%% Connect them:
'CosEventDomainAdmin_EventDomain':add_connection(ED, C1),
</pre></div>
<center>
<hr/>
<small>cosEventDomain 1.1.3<br/>
Copyright © 1991-2008
<a href="http://www.ericsson.com/technology/opensource/erlang">Ericsson AB</a><br/>
</small>
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