Hi all,
I'm especially unclear about how this would work at the individual
operation level, which was also part of what was discussed. My memory is
that there's (normally?) just one message receiver per MEP. So if the
intent is to offer a per-operation ping, I suppose you could pass the
operation name to the ping method. That seems somewhat ugly to me in
that the user code now has to be able to identify operations. Perhaps
it's better to instead have the ping only at the service level, where it
can be more clearly defined.
We can introduce "ping" in two levels.. The service level ping would
ping message receivers belonging to each and every operation listed
under that service. The operation level ping would ping just the given
operation.. We assume a certain "ping" request as a service level ping
whenever the operation name is missing in the body.. In this case we
might need to think bit more about the response message structure..
<complexType name="operationStatus">
<complexContent>
<restriction base="anyType">
<xs:sequence>
<xs:element name="status" type="xs:boolean"/>
<xs:any minOccurs="0" maxOccurs="unbounded" namespace="##any"
processContents="lax"/>
</xs:sequence>
<attribute name="operationName" type="string" />
</restriction>
</complexContent>
</complexType>
The return type can be an array of operationStatus type..
Just my two cents :)..
Thanks,
Thilina
This does mean that the ping() method would need to pass some form of
structured response back to the message receiver, rather than just a
boolean. Perhaps we could define a PingResponse class along these lines
to make it easy:
public class PingResponse {
private boolean up;
public PingResponse(boolean up) {
this.up = up;
}
public isUp() {
return up;
}
public List getAddedElements() {
// user classes can override to return a list of OMElement
return Collections.EMPTY_LIST;
}
}
I don't think the ping request really needs to be extensible, but
passing a String parameter is easy. That would allow the operation name
to be passed as previously proposed by Sameera, if someone does want an
operation-specific ping. So perhaps the ping logic calls each message
receiver ping() implementation in turn until it gets a non-null
PingResponse result?
- Dennis
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Thilina Gunarathne
WSO2, Inc.; http://www.wso2.com/
Home page: http://webservices.apache.org/~thilina/
Blog: http://thilinag.blogspot.com/
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