Hi everybody,
I am using commons-modeler for instrument an application that has a lot of sub classes with a few different details.
Can I define a reference to the common base attributes and operation in the mbeans-descriptors.xml file or do I have to repeat the whole description of attributes and operation for each descendant class?
The simplest way to do this is to leverage the fact that XML has a sort-of funky mechanism to include other files. Simply put the chunk you want to copy into a separate document (typically in the same directory as your configuration file) -- let's say it is called "repeated.xml" -- and do something like this in your configuration file:
<!DOCTYPE mbeans-descriptors PUBLIC "-//Apache Software Foundation//DTD Model MBeans Configuration File" "http://jakarta.apache.org/commons/dtds/mbeans-descriptors.dtd"; [ <!ENTITY repeated SYSTEM "repeated.xml"> ]>
<mbeans-descriptors>
<mbean name="base" className="mbeans.BaseMBean">
<attribute name="unique" .../>
&repeated;
</mbean>...
</mbean-descriptors>
One restriction of this is that the XML parser has to know the URL of the configuration file you are parsing. If you're using Digester to parse it (for example), you'll need to do something like this:
InputStream input = null;
try {
URL url = "file:///home/craigmcc/my-mbeans.xml"; // Or any other URL to your config file
InputSource source = new InputSource(url.toExternalForm());
input = url.openStream();
source.setByteStream(input);
digester.parse(source);
} catch ( ... ) {
...
}
If this approach doesn't work, you can always use shell scripts (or corresponding Ant commands) to assemble the "real" configuation file from various pieces.
Craig
e.g. with: beans.Child extends beans.Base <mbean name="base" className="mbeans.BaseMBean" type="beans.Base"> <attribute name="name" type="java.lang.String"/> <attribute name="attribute1" type="int" writeable="false"/> <attribute name="attribute2" type="int" writeable="false"/> </mbean>
Is there some way to avoid tho describe the attributes name, attribute1 and attribute2 in the bmean child?
<mbean name="child"
className="mbeans.ChildMBean"
type="beans.Child">
<attribute name="name" \
type="java.lang.String"/> |
<attribute name="attribute1" | is there any way
type="int" > for avoid
writeable="false"/> | repeating that?
<attribute name="attribute2" |
type="int" |
writeable="false"/> /
<attribute name="attribute3" type="java.lang.String"/> <attribute name="attribute4" type="java.lang.String"/> </mbean>
Cheers JD
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