+1 from me too.
On 10/26/2017 06:49 PM, Andrea Aime wrote:
Hi folks,
for some work we are doing on a new community module (the NSG profile for WFS,
will talk about it in
a separate mail) we need to have TransactionPlugin be able to alter
transactions.
Unfortunately when WFS 2.0 was introduced the refactoring broke it and it
cannot do that any more,
ticket here:
https://osgeo-org.atlassian.net/browse/GEOS-7403
What is more, the thing cannot just be fixed, it has to be replaced, because
WFS 2.0 transactions
cannot be translated down to WFS 1.1 ones and brought back without losing some
information
(in particular, the new Replace element).
So, I'm proposing to create a new TransactionPlugin2 that takes the
TransactionRequest object,
and make the latter modifyable enough to allow transaction manipulation.
The interface looks the same and it's easy to migrate from the old one (I've
just migrated two
implementations quickly):
public interface TransactionPlugin2extends TransactionListener,
ExtensionPriority {
/** * Check/alter the transaction request elements */ TransactionRequest
beforeTransaction(TransactionRequest request)
throws WFSException;
/** * Say the last word before we actually commit the transaction */ void
beforeCommit(TransactionRequest request)throws WFSException;
/** * Notification the transaction ended * * @param request * the
originating transaction request * @param result * {@code null} if {@code
committed == false}, the transaction result object to be * sent back to the
client otherwise. * * @param committed * true if the transaction was
successful, false if the transaction was aborted for * any reason */ void
afterTransaction(TransactionRequest request, TransactionResponse result,boolean
committed);
@Override default int getPriority() {
return ExtensionPriority.LOWEST;
}
}
(given the similarty to the old one, and the fact it is there to fix a
regression, I counted this as a half new extension point :-p)
For the same NSG plugin we need to also be able to alter GetFeature request
before they hit the database, for that we'd introduce this
new interface:
public interface GetFeatureCallbackextends ExtensionPriority {
void beforeQuerying(GetFeatureContext context);
@Override default int getPriority() {
return ExtensionPriority.LOWEST;
}
}
public final class GetFeatureContext {
private final GetFeatureRequestrequest;
private FeatureSource<?extends FeatureType, ?extends Feature>featureSource;
private Queryquery;
private final FeatureTypeInfofeatureTypeInfo;
public GetFeatureContext(GetFeatureRequest request, FeatureSource<?extends
FeatureType, ?extends Feature> featureSource,
Query query, FeatureTypeInfo featureTypeInfo) {
this.request = request;
this.featureSource = featureSource;
this.query = query;
this.featureTypeInfo = featureTypeInfo;
}
public GetFeatureRequest getRequest() {
return request;
}
public FeatureSource<?extends FeatureType, ?extends Feature>
getFeatureSource() {
return featureSource;
}
public void setFeatureSource(FeatureSource<?extends FeatureType, ?extends
Feature> featureSource) {
this.featureSource = featureSource;
}
public Query getQuery() {
return query;
}
public void setQuery(Query query) {
this.query = query;
}
public FeatureTypeInfo getFeatureTypeInfo() {
return featureTypeInfo;
}
}
The idea is that implementors are free to wrap/replace the feature source and
the query. It's up to the implementor to
make sure the changes are not going to break the WFS protocol (or even feel
free to break it, if they are in complete
control of the client, as sometimes happens).
The feature type and request are viewable, but not changeable, because at the
point where the callback is called,
they have been both used already to do various things, so so allowing to change
them might give the wrong
idea to implementors (that they can get effects they really cannot achieve).
So, two questions:
* Any feedback?
* Do you think the above is proposal worthy?
If I don't hear anything I'll assume nobody is worried and no proposal is
required. Ah, I have no intention of backporting
for the time being.
Cheers
Andrea
==GeoServer Professional Services from the experts! Visit http://goo.gl/it488V
for more information.==Ing. Andrea Aime @geowolfTechnical LeadGeoSolutions
S.A.S.Via di Montramito 3/A55054 Massarosa (LU)phone: +39 0584 962313fax: +39
0584 1660272mob: +39 339
8844549http://www.geo-solutions.ithttp://twitter.com/geosolutions_it
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