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ManagedService
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org.osgi.service.cm</FONT>
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Interface ManagedService</H2>
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<DL>
<DT><PRE>public interface <B>ManagedService</B></DL>
</PRE>
<P>
A service that can receive configuration data from a Configuration Admin
service.
<p>
A Managed Service is a service that needs configuration data. Such an object
should be registered with the Framework registry with the
<code>service.pid</code> property set to some unique identifier called a
PID.
<p>
If the Configuration Admin service has a <code>Configuration</code> object
corresponding to this PID, it will callback the <code>updated()</code>
method of the <code>ManagedService</code> object, passing the properties of
that <code>Configuration</code> object.
<p>
If it has no such <code>Configuration</code> object, then it calls back
with a <code>null</code> properties argument. Registering a Managed Service
will always result in a callback to the <code>updated()</code> method
provided the Configuration Admin service is, or becomes active. This callback
must always be done asynchronously.
<p>
Else, every time that either of the <code>updated()</code> methods is
called on that <code>Configuration</code> object, the
<code>ManagedService.updated()</code> method with the new properties is
called. If the <code>delete()</code> method is called on that
<code>Configuration</code> object, <code>ManagedService.updated()</code>
is called with a <code>null</code> for the properties parameter. All these
callbacks must be done asynchronously.
<p>
The following example shows the code of a serial port that will create a port
depending on configuration information.
<pre>
class SerialPort implements ManagedService {
ServiceRegistration registration;
Hashtable configuration;
CommPortIdentifier id;
synchronized void open(CommPortIdentifier id,
BundleContext context) {
this.id = id;
registration = context.registerService(
ManagedService.class.getName(),
this,
getDefaults()
);
}
Hashtable getDefaults() {
Hashtable defaults = new Hashtable();
defaults.put( "port", id.getName() );
defaults.put( "product", "unknown" );
defaults.put( "baud", "9600" );
defaults.put( Constants.SERVICE_PID,
"com.acme.serialport." + id.getName() );
return defaults;
}
public synchronized void updated(
Dictionary configuration ) {
if ( configuration ==
<code>null
</code>
)
registration.setProperties( getDefaults() );
else {
setSpeed( configuration.get("baud") );
registration.setProperties( configuration );
}
}
...
}
</pre>
<p>
As a convention, it is recommended that when a Managed Service is updated, it
should copy all the properties it does not recognize into the service
registration properties. This will allow the Configuration Admin service to
set properties on services which can then be used by other applications.
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/osgi/service/cm/ManagedService.html#updated(java.util.Dictionary)">updated</A></B>(java.util.Dictionary properties)</CODE>
<BR>
Update the configuration for a Managed Service.</TD>
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<A NAME="updated(java.util.Dictionary)"><!-- --></A><H3>
updated</H3>
<PRE>
void <B>updated</B>(java.util.Dictionary properties)
throws <A HREF="../../../../org/osgi/service/cm/ConfigurationException.html" title="class in org.osgi.service.cm">ConfigurationException</A></PRE>
<DL>
<DD>Update the configuration for a Managed Service.
<p>
When the implementation of <code>updated(Dictionary)</code> detects any
kind of error in the configuration properties, it should create a new
<code>ConfigurationException</code> which describes the problem. This
can allow a management system to provide useful information to a human
administrator.
<p>
If this method throws any other <code>Exception</code>, the
Configuration Admin service must catch it and should log it.
<p>
The Configuration Admin service must call this method asynchronously
which initiated the callback. This implies that implementors of Managed
Service can be assured that the callback will not take place during
registration when they execute the registration in a synchronized method.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>properties</CODE> - A copy of the Configuration properties, or
<code>null</code>. This argument must not contain the
"service.bundleLocation" property. The value of this property may
be obtained from the <code>Configuration.getBundleLocation</code>
method.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../org/osgi/service/cm/ConfigurationException.html" title="class in org.osgi.service.cm">ConfigurationException</A></CODE> - when the update fails</DL>
</DD>
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