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<img alt="Erlang logo" src="../../../../doc/erlang-logo.png"><br><small><a href="users_guide.html">User's Guide</a><br><a href="index.html">Reference Manual</a><br><a href="release_notes.html">Release Notes</a><br><a href="../pdf/cosNotification-1.1.18.pdf">PDF</a><br><a href="../../../../doc/index.html">Top</a></small><p><strong>cosNotification</strong><br><strong>User's Guide</strong><br><small>Version 1.1.18</small></p>
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<h1>4 The Notification Service Components</h1>
<h3><a name="id62962">4.1
The Notification Service Components</a></h3>
<p>This chapter describes the Notification Service Components and how they
interact.</p>
<h4>Components</h4>
<p>There are seven components in the OMG Notification Service architecture.
These are described below: </p>
<a name="notificationFlow"></a>
<img alt="IMAGE MISSING" src="notificationFlow.gif"><br>
<em>Figure
4.1:
Figure 1: The Notification Service Components.</em>
<ul>
<li>
<strong>Event Channel:</strong> acts as a factory for Administrator objects.
Allows clients to set Administrative Properties.</li>
<li>
<strong>Supplier Administrators:</strong> acts as a factory for Proxy Consumers.
Administrators are started as <span class="code">'AND_OP'-</span> or <span class="code">'OR_OP'-</span>type,
which determines if events must be validated using both the Administrators
associated Filter and/or its Proxy children Filters.</li>
<li>
<strong>Consumer Administrators:</strong> acts in the same way as Supplier Administrators
but handle Proxy Suppliers.</li>
<li>
<strong>Consumer Proxy:</strong> is connected to a client application. Can be
started as <span class="code">Pull</span> or <span class="code">Push</span> object. If the proxy is Push style
the client application must push events to the Proxy, otherwise the Proxy is
supposed to Pull events. The <span class="code">CosNotification::AdminProperties</span> is
used to set the pacing interval.</li>
<li>
<strong>Supplier Proxy:</strong> Acts in a similar way as the Consumer Proxy, but
if started as a <span class="code">Push</span> proxy it will push events to the client
application.</li>
<li>
<strong>Filters:</strong> used to filter events. May be associated with Proxies
and Administrators.</li>
<li>
<strong>Mapping Filters:</strong> used to override events Quality of Service
settings. Can only be associated with Consumer Administrators and
Proxy Suppliers.</li>
</ul>
<p>When a Proxy is started it is set to accept <span class="code">CORBA::Any</span>,
<span class="code">CosNotification::StructuredEvent</span> or <span class="code">CosNotification::EventBatch</span>
(a sequence of structured events).</p>
<p>If a Proxy is supposed to deliver structured events to a client application
and receives an <span class="code">CORBA::Any</span> event, the event is converted to a
structured event with <span class="code">type_name</span> set to <span class="code">"%ANY"</span> and the
event is stored in <span class="code">remainder_of_body</span>.</p>
<p>If a Proxy is supposed to deliver <span class="code">CORBA::Any</span> events to a client application
and receives a structured event, the event is stored in an Any type. The
Any Type Code will be equal to the <span class="code">CosNotification::StructuredEvent</span>
Type Code.</p>
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