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<?xml version="1.0" encoding="latin1" ?>
<!DOCTYPE chapter SYSTEM "chapter.dtd">
<chapter>
<header>
<copyright>
<year>2000</year><year>2009</year>
<holder>Ericsson AB. All Rights Reserved.</holder>
</copyright>
<legalnotice>
The contents of this file are subject to the Erlang Public License,
Version 1.1, (the "License"); you may not use this file except in
compliance with the License. You should have received a copy of the
Erlang Public License along with this software. If not, it can be
retrieved online at http://www.erlang.org/.
Software distributed under the License is distributed on an "AS IS"
basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
the License for the specific language governing rights and limitations
under the License.
</legalnotice>
<title>The Notification Service Components</title>
<prepared>Niclas Eklund</prepared>
<docno></docno>
<date>2000-04-13</date>
<rev></rev>
<file>ch_system.xml</file>
</header>
<section>
<title>The Notification Service Components</title>
<p>This chapter describes the Notification Service Components and how they
interact.</p>
<section>
<title>Components</title>
<p>There are seven components in the OMG Notification Service architecture.
These are described below: </p>
<marker id="notificationFlow"></marker>
<image file="notificationFlow.gif">
<icaption>
Figure 1: The Notification Service Components.</icaption>
</image>
<list type="bulleted">
<item><em>Event Channel:</em> acts as a factory for Administrator objects.
Allows clients to set Administrative Properties.</item>
<item><em>Supplier Administrators:</em> acts as a factory for Proxy Consumers.
Administrators are started as <c>'AND_OP'-</c> or <c>'OR_OP'-</c>type,
which determines if events must be validated using both the Administrators
associated Filter and/or its Proxy children Filters.</item>
<item><em>Consumer Administrators:</em> acts in the same way as Supplier Administrators
but handle Proxy Suppliers.</item>
<item><em>Consumer Proxy:</em> is connected to a client application. Can be
started as <c>Pull</c> or <c>Push</c> 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 <c>CosNotification::AdminProperties</c> is
used to set the pacing interval.</item>
<item><em>Supplier Proxy:</em> Acts in a similar way as the Consumer Proxy, but
if started as a <c>Push</c> proxy it will push events to the client
application.</item>
<item><em>Filters:</em> used to filter events. May be associated with Proxies
and Administrators.</item>
<item><em>Mapping Filters:</em> used to override events Quality of Service
settings. Can only be associated with Consumer Administrators and
Proxy Suppliers.</item>
</list>
<p>When a Proxy is started it is set to accept <c>CORBA::Any</c>,
<c>CosNotification::StructuredEvent</c> or <c>CosNotification::EventBatch</c>
(a sequence of structured events).</p>
<p>If a Proxy is supposed to deliver structured events to a client application
and receives an <c>CORBA::Any</c> event, the event is converted to a
structured event with <c>type_name</c> set to <c>"%ANY"</c> and the
event is stored in <c>remainder_of_body</c>.</p>
<p>If a Proxy is supposed to deliver <c>CORBA::Any</c> 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 <c>CosNotification::StructuredEvent</c>
Type Code.</p>
</section>
</section>
</chapter>
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