Re: [CONF] Apache Sling Website: Discover Sling in 15 minutes (page edited)
sure thanks On Thu, May 28, 2009 at 11:13 PM, Mike Müller wrote: > Hi Benjamin > > Thank you for your corrections. I took it over to the Sling website. > If you have more updates/corrections or even new documenations/examples > feel free to contact me. > > best regards > mike > >> -----Original Message- >> From: pub cog [mailto:pub@gmail.com] >> Sent: Thursday, May 28, 2009 3:53 PM >> To: sling-dev@incubator.apache.org >> Subject: Re: [CONF] Apache Sling Website: Discover Sling in 15 minutes >> (page edited) >> >> >> Done. You can review changes >> http://cwiki.apache.org/confluence/display/SLING/Discover+Slin >> g+in+15+minutes >> ;) >> http://cwiki.apache.org/confluence/pages/viewpreviouspageversi > ons.action?pageId=118769 > > Also, in http://incubator.apache.org/sling/site/architecture.html: > > "... Web Applications with Sling, *a an* API has been defined..." > there is an extra "a" > "... Web Applications with Sling, *an* API has been defined..." > > as I said minor ;) > >
Re: Geographical Datastore and Posgis integration
Thanks a lot, that's exactly the information I was looking for :)
I'll dive into this and try to make a first prototype.
Thanks again :)
On Thu, May 28, 2009 at 11:52 PM, Paul Mietz Egli wrote:
> Regarding importing KML into JCR:
>
>> If that's what you meant, I didn't thought of this, why not... I need
>> to think about it...
>> search may be easier but that means I need to make some kind of
>> automatic parsing transformation to jcr ,nodes ?
>
> Try using Session.importXML() first and see if that meets your needs:
>
> http://www.day.com/maven/jsr170/javadocs/jcr-1.0/javax/jcr/Session.html#importXML(java.lang.String,%20java.io.InputStream,%20int)
>
> From the javadocs:
>
> "The tree of new items is built in the transient storage of the Session. In
> order to persist the new content, save must be called. The advantage of this
> through-the-session method is that (depending on what constraint checks the
> implementation leaves until save) structures that violate node type
> constraints can be imported, fixed and then saved. The disadvantage is that
> a large import will result in a large cache of pending nodes in the session.
> See Workspace.importXML(java.lang.String, java.io.InputStream, int) for a
> version of this method that does not go through the Session."
>
>> On an architectural point of view, I thought about having a Sling
>> server and a postgis database separate.
>> - Sling: will actually store files and properties associated with them
>> - Postgis: will store only a jcr path and 'geom' informations
>> - Java: code some java component(s) (osgi bundle ?) to synchronize both
>
>
> In Postgres, I'd suggest using a UUID of the root of the KML doc instead of
> a JCR path since paths can change. You can then use Session.getNodeByUUID()
> to look up the KML node.
>
>> Step n°1: I was thinking to use some kind of 'hook' on ressource
>> creation/update to compute the geom and store a couple
>> (path_in_jcr/geom) in postgres/postgis
>> Should I do such a hook by "Extending the SlingPostServlet" describe
>> in "Advanced Topic" (5) ?!
>
> Sounds like your KML is arriving in the body of an HTTP POST request. You
> could extend the SlingPostServlet as described in the docs to handle
> importing the KML (e.g. by passing the servlet input stream into
> Session.importXML). If your geometry computations take more than a few
> hundred milliseconds, you should consider doing them in a JCR EventListener
> that gets called after your nodes are created rather than in-process with
> the HTTP request. Rough code would be:
>
>
> /**
> * @scr.component metatype="false" enabled="true" immediate="true"
> * @scr.service
> interface="org.apache.sling.servlets.post.SlingPostOperation"
> * @scr.property name="sling.post.operation" value="myoperation"
> *
> * @author Paul Mietz Egli
> */
> public class MyPostOperation extends AbstractSlingPostOperation {
> �...@override
> protected void doRun(SlingHttpServletRequest request, HtmlResponse
> response, List changes) throws RepositoryException {
> String basepath = "/content/kml"; // TODO use @scr.property to set
> actual value
> Session session =
> request.getResourceResolver().adaptTo(Session.class);
> session.importXML(basepath, request.getInputStream(),
> ImportUUIDBehavior.IMPORT_UUID_CREATE_NEW);
> // TODO maybe set a custom node type on the root of your KML doc that
> you can use in the event listener
> }
> }
>
> * @scr.component metatype="true" enabled="true" immediate="true"
> * @scr.service interface="javax.jcr.observation.EventListener"
> *
> * @author Paul Mietz Egli
> */
> public class GeometryComputationEventListener implements EventListener {
> /**
> * @scr.reference
> */
> private SlingRepository repository;
>
> protected void activate(ComponentContext context) {
> try {
> String path = "/content/kml";
> String[] nodeTypes = new String[] { "nt:unstructured" };
> session = repository.loginAdministrative(null);
> ObservationManager observationManager =
> session.getWorkspace().getObservationManager();
> observationManager.addEventListener(this, Event.NODE_ADDED, path,
> true, null, nodeTypes, false);
> }
> catch (RepositoryException e) {}
> }
>
> public void onEvent(EventIterator eventIterator) {
> while (eventIterator.hasNext()) {
> Event event = (Event) eventIterator.next();
> switch (event.getType()) {
> case Event.NODE_ADDED:
> // TODO test node type/location to make sure you're
> seeing the root of the KML tree
> // TODO pull placemarks out of KML tree and convert to
> WKT for PostGIS
> }
> }
> }
> }
> }
>
>
>
>
> p.
Re: [CONF] Apache Sling Website: Discover Sling in 15 minutes (page edited)
Done. You can review changes http://cwiki.apache.org/confluence/display/SLING/Discover+Sling+in+15+minutes ;) http://cwiki.apache.org/confluence/pages/viewpreviouspageversions.action?pageId=118769 Also, in http://incubator.apache.org/sling/site/architecture.html: "... Web Applications with Sling, *a an* API has been defined..." there is an extra "a" "... Web Applications with Sling, *an* API has been defined..." as I said minor ;) On Wed, May 27, 2009 at 10:43 PM, Mike Müller wrote: > Hi again > snip snap >> You're very welcome to contribute to the documentation. >> I duplicated the "Discover Sling in 15 minutes" page in the public >> wiki under [1]. >> Please put your enhancements and corrections there and let me >> know if you have finished. I will take the new version over to >> the Sling website after that. >> > > sorry forgot the link: > [1] > http://cwiki.apache.org/confluence/display/SLING/Discover+Sling+in+15+minutes > >> best regards >> mike >> >
Re: [CONF] Apache Sling Website: Discover Sling in 15 minutes (page edited)
thanks for the explanation :) On Wed, May 27, 2009 at 6:25 PM, Alexander Klimetschek wrote: > On Wed, May 27, 2009 at 6:04 PM, pub cog wrote: >> I sneak into this thread to ask how does the official website is >> created ? http://incubator.apache.org/sling/site/ > > It is created by exporting a separate confluence wiki: > > http://cwiki.apache.org/confluence/display/SLINGxSITE > > Write access is restricted. > > This is different from the public Sling wiki at: > > http://cwiki.apache.org/confluence/display/SLING > > >> I'd like to provide minor enhancements patches to the documentation >> but I couldn't find it under svn ? >> http://svn.apache.org/repos/asf/incubator/sling/trunk/site/ ? >> http://svn.apache.org/repos/asf/incubator/sling/site/ ? > > Note that a cleanup of the docs is just on it's way, you might ask > Mike Müller on how you can provide improvements for the documentation > to him: > > http://markmail.org/message/7vu63i7rketgdozi > > Regards, > Alex > > -- > Alexander Klimetschek > alexander.klimetsc...@day.com >
Re: Geographical Datastore and Posgis integration
On Wed, May 27, 2009 at 7:45 PM, Vidar Ramdal wrote: > > Just a quick thought. I don't know much about KML, but from the docs > it looks like a fairly simple XML format. exactly it's just xml. > Have you considered storing the KML data as JCR nodes, and not as KML files? > That would certainly make it easier to implement advanced search > features, as you describe. > You mean instead of creating a node /path/my_file.kml and store the content there. creates nodes like they are in the kml, for example, if kml looks like: ... store them as jcr node like this ? kml |__ Folder |__Folder |__ Placemark ... If that's what you meant, I didn't thought of this, why not... I need to think about it... search may be easier but that means I need to make some kind of automatic parsing transformation to jcr ,nodes ?
Re: [CONF] Apache Sling Website: Discover Sling in 15 minutes (page edited)
I sneak into this thread to ask how does the official website is created ? http://incubator.apache.org/sling/site/ I'd like to provide minor enhancements patches to the documentation but I couldn't find it under svn ? http://svn.apache.org/repos/asf/incubator/sling/trunk/site/ ? http://svn.apache.org/repos/asf/incubator/sling/site/ ? I can provide them as plain text in a Jira but I think integration job will be easier if I can provided them as svn diff... ;) On Wed, May 27, 2009 at 5:54 PM, Jukka Zitting wrote: > Hi, > > On Fri, Apr 24, 2009 at 8:57 AM, wrote: >> Reviewed 2009-09-24, this page's information is in sync with the current >> Sling codebase. > > As noted by Tako Schotanus in a chat, this does seem to prove that > Sling's really the future! > > BR, > > Jukka Zitting >
Geographical Datastore and Posgis integration
Hi, I'm building a datastore to hold geographical informations (kml files) providing REST webservices to store, retrieve and search those informations. As a first iteration, I build my own datastore from scratch using postgres/postgis (1), the restlet framework (2) and some old school jdbc. For the second iteration, new features appeared: versionning, unique id generation on creation, update a ressource etc... Many of those features are already addressed by Sling/JCR: 1- 'versionning' JCR is suppose to provide sch a thing, but I didn't find how to use it in Sling; any link is welcome ;) 2- 'uid' using wildcards (path/*) as explain in the tutorial (3) 3- 'update' builtin Sling My main concern is about Posgis :( In my current datastore, I have geographical search functionnality, meaning I have a webservice like this: http://www.domain.com/rest/search?south=43.52&north=43.67&west=1.36&east=1.55 returning a list of resources urls like this: http://www.domain.com/.../1.kml http://www.domain.com/.../2.kml http://www.domain.com/.../3.kml The actual search is based on postgis sql builtin function. Currently the process has 2 main steps: Step n°1- on ressource creation/update, I parse the provided kml file to extract geographical informations > create a 'geom' (4) using postgis function and store it in a database table column Step n°2- on search I transform query coordinnates into a 'geom' and use it against the computed geom(s) created above > I found rows in the db and return them as a list How could I do this with Sling ? I have some ideas, could you tell me if it's possible or even the right direction ? On an architectural point of view, I thought about having a Sling server and a postgis database separate. - Sling: will actually store files and properties associated with them - Postgis: will store only a jcr path and 'geom' informations - Java: code some java component(s) (osgi bundle ?) to synchronize both Step n°1: I was thinking to use some kind of 'hook' on ressource creation/update to compute the geom and store a couple (path_in_jcr/geom) in postgres/postgis Should I do such a hook by "Extending the SlingPostServlet" describe in "Advanced Topic" (5) ?! Step n°2: tricky :( I've read about resources search in "Querying Resources" (6), but it's still blury :( Additionnal information: - I don't care about portability accross different jcr backend, at least not at the moment ;) Thanks __ Benjamin Francisoud http://francisoud.blogspot.com [1] http://postgis.refractions.net/ [2] http://www.restlet.org/ [3] http://incubator.apache.org/sling/site/discover-sling-in-15-minutes.html#Additional examples: "Let Sling generate the path of a newly created node." [4]geom: http://postgis.refractions.net/documentation/manual-1.3/ch04.html#RefObject [5] http://incubator.apache.org/sling/site/manipulating-content-the-slingpostservlet.html [6] http://incubator.apache.org/sling/site/resources.html
New to Sling
Hi list, I'm new to Sling and currently evaluating it for a new project. First of all, thank for making Sling. It's really a great product. I heard about it from Bertrand Delacrétaz's Blog (1). I set it up in a few minutes and the tutorial (2) went nicely :) It's funny because there seems to be many cocoon commiters working on this project, I've seen familiar names (on the wiki/mailing lists) back from the days when I used cocoon at Anyware Tech (3) :) Sling fulfill (almost) all my needs ... But I have some feasibility questions to answer before starting to use Sling for good, so expect other mails from me :) cheers. -- Benjamin Francisoud http://francisoud.blogspot.com [1] http://grep.codeconsult.ch/ [2] http://incubator.apache.org/sling/site/discover-sling-in-15-minutes.html [3] http://www.anyware-tech.com
