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<title>Quality Of Service and Admin Properties</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="3"><!-- Empty --></a>
<h2>3 Quality Of Service and Admin Properties</h2>
<a name="3.1"><!-- Empty --></a>
<h3>3.1 Quality Of Service and Admin Properties</h3>
<p>This chapter explains the allowed properties it is possible to set for this
application.
</p><a name="3.1.1"><!-- Empty --></a>
<h4>3.1.1 Quality Of Service</h4>
<p>The cosEventDomain application supports the following QoS settings:
</p>
<center>
<table cellspacing="0" cellpadding="2" border="1">
<caption align="bottom"><em>Supported QoS settings</em></caption>
<tr>
<td align="center" valign="middle">
<strong>QoS</strong>
</td>
<td align="center" valign="middle">
<strong>Range</strong>
</td>
<td align="center" valign="middle">
<strong>Default</strong>
</td>
</tr>
<tr>
<td align="left" valign="middle">
CycleDetection
</td>
<td align="left" valign="middle">
AuthorizeCycles/ForbidCycles
</td>
<td align="left" valign="middle">
ForbidCycles
</td>
</tr>
<tr>
<td align="left" valign="middle">
DiamondDetection
</td>
<td align="left" valign="middle">
AuthorizeDiamonds/ForbidDiamonds
</td>
<td align="left" valign="middle">
ForbidDiamonds
</td>
</tr>
</table>
</center>
<br />
<br />
<br />
<br />
<p><strong>Comments on the table 'Supported QoS Settings':</strong>
</p>
<dl>
<dt>
<strong>CycleDetection</strong>
</dt>
<dd>
If a cycle is created, the user <strong>must</strong> be aware of the fact
that unless they set timeout on events, events that are not filtered
will loop endlessly through the topology.
</dd>
<dt>
<strong>DiamondDetection</strong>
</dt>
<dd>
A Diamond in this context, means that the same
event may reach a point in the graph by more than one route
(i.e. transitive). Hence, it is possible that multiple copies
are delivered.
</dd>
</dl>
<a name="3.1.2"><!-- Empty --></a>
<h4>3.1.2 Setting Quality Of Service</h4>
<p>Assume we have a Consumer Admin object which we want to change
the current Quality of Service. Typical usage:
</p>
<div class="example"><pre>
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'())}],
'CosEventDomainAdmin_EventDomain':set_qos(ED, QoS),
</pre></div>
<p>If it is not possible to set the requested QoS the <span class="code">UnsupportedQoS</span>
exception is raised, which includes a sequence of <span class="code">PropertyError</span>'s
describing which QoS, possible range and why is not allowed. The error
codes are:
</p>
<ul>
<li>
UNSUPPORTED_PROPERTY - QoS not supported for this type of target object.
</li>
<li>
UNAVAILABLE_PROPERTY - due to current QoS settings the given property
is not allowed.
</li>
<li>
UNSUPPORTED_VALUE - property value out of range; valid range is returned.
</li>
<li>
UNAVAILABLE_VALUE - due to current QoS settings the given value is
not allowed; valid range is returned.
</li>
<li>
BAD_PROPERTY - unrecognized property.
</li>
<li>
BAD_TYPE - type of supplied property is incorrect.
</li>
<li>
BAD_VALUE - illegal value.
</li>
</ul>
<p>The CosEventDomainAdmin_EventDomain interface also supports an operation
called <span class="code">validate_qos/2</span>. The purpose of this operations is to check
if a QoS setting is supported by the target object and if so, the operation
returns additional properties which could be optionally added as well.
</p><a name="3.1.3"><!-- Empty --></a>
<h4>3.1.3 Admin Properties</h4>
<p>The OMG specification do not contain any definitions of Admin Properties.
Hence, the cosEventDomain application currently does not support any Admin
Properties.
</p><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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