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RemoteAlertSender
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<H2>
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info.dmtree.notification.spi</FONT>
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Interface RemoteAlertSender</H2>
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<DL>
<DT><PRE>public interface <B>RemoteAlertSender</B></DL>
</PRE>
<P>
The RemoteAlertSender can be used to send notifications to (remote) entities
identified by principal names. This service is provided by Protocol Adapters,
and is used by the <A HREF="../../../../info/dmtree/notification/NotificationService.html" title="interface in info.dmtree.notification"><CODE>NotificationService</CODE></A> when
sending alerts. Implementations of this interface have to be able to connect
and send alerts to one or more management servers in a protocol specific way.
<p>
The properties of the service registration should specify a list of
destinations (principals) where the service is capable of sending alerts.
This can be done by providing a <code>String</code> array of principal names
in the <code>principals</code> registration property. If this property is not
registered, the service will be treated as the default sender. The default
alert sender is only used when a more specific alert sender cannot be found.
<p>
The <code>principals</code> registration property is used when the
<A HREF="../../../../info/dmtree/notification/NotificationService.html#sendNotification(java.lang.String, int, java.lang.String, info.dmtree.notification.AlertItem[])"><CODE>NotificationService.sendNotification(java.lang.String, int, java.lang.String, info.dmtree.notification.AlertItem[])</CODE></A> method
is called, to find the proper <code>RemoteAlertSender</code> for the given
destination. If the caller does not specify a principal, the alert is only
sent if the Notification Sender finds a default alert sender, or if the
choice is unambiguous for some other reason (for example if only one alert
sender is registered).
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../info/dmtree/notification/spi/RemoteAlertSender.html#sendAlert(java.lang.String, int, java.lang.String, info.dmtree.notification.AlertItem[])">sendAlert</A></B>(java.lang.String principal,
int code,
java.lang.String correlator,
<A HREF="../../../../info/dmtree/notification/AlertItem.html" title="class in info.dmtree.notification">AlertItem</A>[] items)</CODE>
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Sends an alert to a server identified by its principal name.</TD>
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<A NAME="sendAlert(java.lang.String, int, java.lang.String, info.dmtree.notification.AlertItem[])"><!-- --></A><H3>
sendAlert</H3>
<PRE>
void <B>sendAlert</B>(java.lang.String principal,
int code,
java.lang.String correlator,
<A HREF="../../../../info/dmtree/notification/AlertItem.html" title="class in info.dmtree.notification">AlertItem</A>[] items)
throws java.lang.Exception</PRE>
<DL>
<DD>Sends an alert to a server identified by its principal name. In case the
alert is sent in response to a previous
<A HREF="../../../../info/dmtree/DmtSession.html#execute(java.lang.String, java.lang.String, java.lang.String)"><CODE>execute</CODE></A>
command, a correlation identifier can be specified to provide the
association between the execute and the alert.
<p>
The <code>principal</code> parameter specifies which server the alert
should be sent to. This parameter can be <code>null</code> if the
client does not know the name of the destination. The alert should still
be delivered if possible; for example if the alert sender is only
connected to one destination.
<p>
Any exception thrown on this method will be propagated to the original
sender of the event, wrapped in a <code>DmtException</code> with the
code <code>REMOTE_ERROR</code>.
<p>
Since sending the alert and receiving acknowledgment for it is
potentially a very time-consuming operation, alerts are sent
asynchronously. This method should attempt to ensure that the alert can
be sent successfully, and should throw an exception if it detects any
problems. If the method returns without error, the alert is accepted for
sending and the implementation must make a best-effort attempt to deliver
it.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>principal</CODE> - the name identifying the server where the alert should
be sent, can be <code>null</code><DD><CODE>code</CODE> - the alert code, can be 0 if not needed<DD><CODE>correlator</CODE> - the correlation identifier of an associated EXEC
command, or <code>null</code> if there is no associated EXEC<DD><CODE>items</CODE> - the data of the alert items carried in this alert, can be
empty or <code>null</code> if no alert items are needed
<DT><B>Throws:</B>
<DD><CODE>java.lang.Exception</CODE> - if the alert can not be sent to the server</DL>
</DD>
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