Hi Michael
GEOFF was originally conceived as a graph serialisation format and, as
such, was intended to represent a snapshot of entities at a particular
point in time instead of, as you are discussing, a programmatic set of
actions (add, replace, remove, etc). That said, these ideas are still worth
exploring...
First off, since hooks are the "variables" of GEOFF, it would seem
consistent to use those for assigning the return values of index lookups
and queries. Something like the following could be used to perform an index
query, assign the result to a hook and use that hook to build a
relationship:
{foo} := |index| @ {"key": "value"}
{foo}-[:KNOWS]->(bar)
Actually, since the index query may result in multiple returned entities,
we might want to limit to the first item returned:
{foo} := |index| @ {"key":"value"}
{foo.1}-[:KNOWS]->(bar)
Using the other operators for adding, removing and replacing index entries,
this would make...
# add node bert to index at foo:bar
|index| @ {"foo": "bar"} += (bert)
# remove node bert from index at foo:bar
|index| @ {"foo": "bar"} -= (bert)
# replace node with bert in index at foo:bar
|index| @ {"foo": "bar"} := (bert)
So essentially, we would be looking at at least the following requirements:
1. Allow hooks to hold multiple entities instead of just a single entity
2. Allow assignment to hooks
3. Implement an "@" operator to allow inline index queries
4. Implement assignment, addition and removal operators to indexes
These ideas would turn GEOFF into much more of a programming language than
a notation for serialisation: a big change and one which would potentially
require another significant rewrite. I'm not against doing this but I'm
wondering if this is a valuable direction to go in and whether, if we were
to do this, it would be better to start from first principles instead.
Would this fill a gap that none of the other current options can?
Cheers
Nige
*Nigel Small*
Phone: +44 7814 638 246
Blog: http://nigelsmall.name/
GTalk: ni...@nigelsmall.name
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Twitter: @technige <https://twitter.com/#%21/technige>
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On 1 December 2011 21:47, Michael Hunger
<michael.hun...@neotechnology.com>wrote:
> Nigel,
>
> is it possible to also do index-lookups in geoff?
> and use those as nodes or rels or even as hooks for later on?
>
> I'm also toying with two other ideas:
> #1 using indexes as the third primitive besides nodes and rels in geoff
> just with a different delimeter (e.g. | as you already have)
> #2 giving indexes a similar semantics as relationships to category nodes
> (which is the same for in-graph indexes, where the index-name is the
> category-type and indexed key-values are properties on the relationship or
> relationships)
>
> I'm not really satisfied with the syntaxes I came up with and would like
> to brainstorm that.
>
> |index| -{"foo":"bar"} ->(bert)
>
>
> some ideas for alternative index syntaxes
> #add
> |index:{"foo":"bar"}|+={foo}
> # replace
> |index:{"foo":"bar"}|={foo}
> # remove
> |index:{"foo":"bar"}|-={foo}
>
> #query
> |index:{"foo":"bar"}| -[:KNOWS]->(bert)
> |index:"querystring"| -[:KNOWS]->(bert)
>
> Am 01.12.2011 um 01:32 schrieb Nigel Small:
>
> > Peter: I am happy with the current state of the neo4j-geoff code so feel
> it
> > should be stable enough to adopt when you wish to do so. I have also
> made a
> > couple of recent updates to the documentation, most notably the GEOFF.md
> > file.
> >
> > Cheers
> >
> > Nige
> >
> > *Nigel Small*
> > Phone: +44 7814 638 246
> > Blog: http://nigelsmall.name/
> > GTalk: ni...@nigelsmall.name
> > MSN: nasm...@live.co.uk
> > Skype: technige
> > Twitter: @technige <https://twitter.com/#%21/technige>
> > LinkedIn: http://uk.linkedin.com/in/nigelsmall
> >
> >
> >
> > On 29 November 2011 23:33, Michael Hunger
> > <michael.hun...@neotechnology.com>wrote:
> >
> >> #1 Thanks
> >> #2 You're probably right
> >>
> >> #3 You can do the index lookup outside and pass in the IndexHits<Node>
> as
> >> being and Iterator
> >> #3 I rather thought of {name} for |people| -> {name: {hook}} as a
> shortcut
> >> for that
> >>
> >> Michael
> >>
> >> But #2 and #3 are probably overkill anyway.
> >>
> >> Cheers
> >>
> >> Michael
> >>
> >> Am 29.11.2011 um 23:59 schrieb Nigel Small:
> >>
> >>> Hi Michael
> >>>
> >>>> Probably better to just return the full map and let the client code
> deal
> >>> with it ? (If it isn't interested it would either just ignore the
> return
> >>> result or discard it quickly).
> >>> Done. Now works as:
> >>>
> >>> Map<String,PropertyContainer> entities =
> >> GEOFFLoader.loadIntoNeo4j(reader,
> >>> db, hooks);
> >>> Node nodeFoo = (Node) entities.get("(foo)");
> >>> Node nodeBar = (Node) entities.get("(bar)");
> >>>
> >>>> Intention behind longs, is when I get them from an external source
> then
> >>> they can be used to be look up nodes during import.
> >>> This can be done but not sure it's the right place... I'm cautious
> about
> >>> using IDs directly as they aren't very portable. Also, it's not
> intuitive
> >>> whether an ID is for a node or relationship. Would like to get a few
> >> votes
> >>> on this - I'm happy to be outvoted if the consensus is to do it!
> >>>
> >>>> Also can hooks be used for index lookups? (Just asking)
> >>> Are you thinking of something like "{People:name=bert}"? If so, this is
> >>> quite a distance from where we are currently since every token can only
> >>> refer to a single entity, whereas an index lookup could return multiple
> >>> results.
> >>>
> >>> Nige
> >>>
> >>> *Nigel Small*
> >>> Phone: +44 7814 638 246
> >>> Blog: http://nigelsmall.name/
> >>> GTalk: ni...@nigelsmall.name
> >>> MSN: nasm...@live.co.uk
> >>> Skype: technige
> >>> Twitter: @technige <https://twitter.com/#%21/technige>
> >>> LinkedIn: http://uk.linkedin.com/in/nigelsmall
> >>>
> >>>
> >>>
> >>> On 29 November 2011 22:09, Michael Hunger
> >>> <michael.hun...@neotechnology.com>wrote:
> >>>
> >>>> Hmm good question, that means the namespace keeps everything around
> >> until
> >>>> it is gc'ed ?
> >>>>
> >>>> Probably better to just return the full map and let the client code
> deal
> >>>> with it ? (If it isn't interested it would either just ignore the
> return
> >>>> result or discard it quickly).
> >>>>
> >>>> Intention behind longs, is when I get them from an external source
> then
> >>>> they can be used to be look up nodes during import.
> >>>>
> >>>> Also can hooks be used for index lookups? (Just asking)
> >>>>
> >>>> Thanks a lot
> >>>>
> >>>> Michael
> >>>>
> >>>> Am 29.11.2011 um 22:58 schrieb Nigel Small:
> >>>>
> >>>>> Hi Michael
> >>>>>
> >>>>> Doesn't handle iterables (yet) but should be quite easy to add in.
> What
> >>>>> purpose did you have behind longs?
> >>>>>
> >>>>> I've just committed a few new methods allowing the Neo4jNamespace
> >>>> returned
> >>>>> from a loadIntoNeo4j call to be used to retrieve new entities by name
> >>>> (or a
> >>>>> map of such). The new methods are:
> >>>>>
> >>>>> public Node getPreexistingNode(String name)
> >>>>> public Map<String, Node> getPreexistingNodes(String... names)
> >>>>> public Node getNewlyCreatedNode(String name)
> >>>>> public Map<String, Node> getNewlyCreatedNodes(String... names)
> >>>>> public Relationship getPreexistingRelationship(String name)
> >>>>> public Map<String, Relationship>
> getPreexistingRelationships(String...
> >>>>> names)
> >>>>> public Relationship getNewlyCreatedRelationship(String name)
> >>>>> public Map<String, Relationship>
> getNewlyCreatedRelationships(String...
> >>>>> names)
> >>>>>
> >>>>> One of the tests in GraphDescriptionTest illustrates simple usage,
> >> thus:
> >>>>>
> >>>>> Neo4jNamespace ns = GEOFFLoader.loadIntoNeo4j(reader, db, hooks);
> >>>>> Node nodeFoo = ns.getNewlyCreatedNode("foo");
> >>>>> Node nodeBar = ns.getNewlyCreatedNode("bar");
> >>>>>
> >>>>> Hope this helps - I'll have a play with iterables next.
> >>>>>
> >>>>> Cheers
> >>>>>
> >>>>> Nige
> >>>>>
> >>>>> *Nigel Small*
> >>>>> Phone: +44 7814 638 246
> >>>>> Blog: http://nigelsmall.name/
> >>>>> GTalk: ni...@nigelsmall.name
> >>>>> MSN: nasm...@live.co.uk
> >>>>> Skype: technige
> >>>>> Twitter: @technige <https://twitter.com/#%21/technige>
> >>>>> LinkedIn: http://uk.linkedin.com/in/nigelsmall
> >>>>>
> >>>>>
> >>>>>
> >>>>> On 29 November 2011 15:58, Michael Hunger
> >>>>> <michael.hun...@neotechnology.com>wrote:
> >>>>>
> >>>>>> does it also handle iterables of nodes/rels (and probably Longs?)
> >>>>>>
> >>>>>> while thinking about it
> >>>>>> it would be great if the loader could also return a map of variables
> >> of
> >>>>>> the things generated to be used further in processing
> >>>>>>
> >>>>>> that could also interesting for cascading geoff and/or cypher
> >>>>>>
> >>>>>> cool stuff big thanks
> >>>>>>
> >>>>>> michael
> >>>>>>
> >>>>>> mobile mail please excuse brevity and typos
> >>>>>>
> >>>>>> Am 29.11.2011 um 16:18 schrieb Peter Neubauer <
> >>>>>> peter.neuba...@neotechnology.com>:
> >>>>>>
> >>>>>>> That sounds great! Let me know when you are stable, and I will see
> if
> >>>>>>> I can do some more on the server plugin side, so we can shoot in
> >>>>>>> things there!
> >>>>>>>
> >>>>>>> Cheers,
> >>>>>>>
> >>>>>>> /peter neubauer
> >>>>>>>
> >>>>>>> GTalk: neubauer.peter
> >>>>>>> Skype peter.neubauer
> >>>>>>> Phone +46 704 106975
> >>>>>>> LinkedIn http://www.linkedin.com/in/neubauer
> >>>>>>> Twitter http://twitter.com/peterneubauer
> >>>>>>>
> >>>>>>> http://www.neo4j.org - NOSQL for the Enterprise.
> >>>>>>> http://startupbootcamp.org/ - Öresund - Innovation happens
> HERE.
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>> On Mon, Nov 28, 2011 at 9:52 PM, Nigel Small <
> ni...@nigelsmall.name>
> >>>>>> wrote:
> >>>>>>>> Hi Peter
> >>>>>>>>
> >>>>>>>> Bulk of the work is now done on the Java version of the GEOFF
> >>>>>> enhancements.
> >>>>>>>> There have been some significant changes to the classes and a
> number
> >>>> of
> >>>>>>>> extra tests inserted. The signature of the load method has now
> been
> >>>>>>>> extended to:
> >>>>>>>>
> >>>>>>>> public static Neo4jNamespace loadIntoNeo4j(Reader reader,
> >>>>>>>> GraphDatabaseService graphDB, Map<String, ? extends
> >> PropertyContainer>
> >>>>>>>> hooks)
> >>>>>>>>
> >>>>>>>> ...where the final parameter expects a Map full of names
> >>>>>>>> Nodes/Relationships which may then be referenced from within the
> >> GEOFF
> >>>>>>>> source.
> >>>>>>>>
> >>>>>>>> Let me know how you get on and give me a shout if I've forgotten
> >>>>>> anything
> >>>>>>>> :-)
> >>>>>>>>
> >>>>>>>> Cheers
> >>>>>>>>
> >>>>>>>> Nige
> >>>>>>>>
> >>>>>>>> *Nigel Small*
> >>>>>>>> Phone: +44 7814 638 246
> >>>>>>>> Blog: http://nigelsmall.name/
> >>>>>>>> GTalk: ni...@nigelsmall.name
> >>>>>>>> MSN: nasm...@live.co.uk
> >>>>>>>> Skype: technige
> >>>>>>>> Twitter: @technige <https://twitter.com/#%21/technige>
> >>>>>>>> LinkedIn: http://uk.linkedin.com/in/nigelsmall
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>> On 23 November 2011 10:12, Peter Neubauer <pe...@neubauer.se>
> >> wrote:
> >>>>>>>>
> >>>>>>>>> Looks great to me Nigel! I think this is a very good first step
> on
> >>>>>>>>> parameters. Let me know when you are done with the Java code,
> would
> >>>>>>>>> like to bring this into the @Graph annotations after our next
> >>>>>>>>> milestone release, 1.6.M01.
> >>>>>>>>>
> >>>>>>>>> /peter
> >>>>>>>>>
> >>>>>>>>> On Tue, Nov 22, 2011 at 10:14 PM, Nigel Small <
> >> ni...@nigelsmall.name
> >>>>>
> >>>>>>>>> wrote:
> >>>>>>>>>> Hi all
> >>>>>>>>>>
> >>>>>>>>>> I have just completed a set of GEOFF enhancements within py2neo
> >> (as
> >>>>>> yet
> >>>>>>>>>> only available from GitHub). Named parameters (hooks) and
> >> composite
> >>>>>>>>>> descriptors are now supported, please see the following sample
> >> file
> >>>>>> for
> >>>>>>>>> an
> >>>>>>>>>> illustration of the new capabilites:
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>
> >>>>>>
> >>>>
> >>
> https://github.com/nigelsmall/py2neo/blob/master/src/py2neo-examples/geoff/node-hooks.geoff
> >>>>>>>>>>
> >>>>>>>>>> In addition, a change has been made for index entries to use
> |foo|
> >>>>>> syntax
> >>>>>>>>>> instead of {foo} syntax as previously (although the old syntax
> >> will
> >>>>>> still
> >>>>>>>>>> work for now).
> >>>>>>>>>>
> >>>>>>>>>> Finally, there is a new wiki page detailing the current format
> in
> >>>>>> full:
> >>>>>>>>>>
> >>>>>>>>>> https://github.com/nigelsmall/py2neo/wiki/GEOFF
> >>>>>>>>>>
> >>>>>>>>>> I will now start planning the set of work required for the
> >>>> neo4j-geoff
> >>>>>>>>>> project to bring that up to the same level.
> >>>>>>>>>>
> >>>>>>>>>> Cheers
> >>>>>>>>>>
> >>>>>>>>>> Nige
> >>>>>>>>>>
> >>>>>>>>>> *Nigel Small*
> >>>>>>>>>> Phone: +44 7814 638 246
> >>>>>>>>>> Blog: http://nigelsmall.name/
> >>>>>>>>>> GTalk: ni...@nigelsmall.name
> >>>>>>>>>> MSN: nasm...@live.co.uk
> >>>>>>>>>> Skype: technige
> >>>>>>>>>> Twitter: @technige <https://twitter.com/#!/technige>
> >>>>>>>>>> LinkedIn: http://uk.linkedin.com/in/nigelsmall
> >>>>>>>>>> _______________________________________________
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