[aerogear-dev] [Aerogear Pipeline] Support for nested endpoints

Tue Apr 9 03:03:55 EDT 2013

On Mon, Apr 8, 2013 at 7:57 PM, Summers Pittman <supittma at redhat.com> wrote:

>
>
> ----- Original Message -----
> | From: "Matthias Wessendorf" <matzew at apache.org>
> | To: "AeroGear Developer Mailing List" <aerogear-dev at lists.jboss.org>
> | Sent: Monday, April 8, 2013 1:22:19 PM
> | Subject: Re: [aerogear-dev] [Aerogear Pipeline] Support for nested
> endpoints
> |
> | OK, with the following server API:
> |
> | http://some.server.com/posts/1
> | http://some.server.com/posts/1/comments
> | (and NO 'comments' collection on the ' http://some.server.com/posts/1 '
> | response)
> |
> | Does this (today) 'myPipe.read(1)' already read the specific comments (
> | http://some.server.com/posts/1/comments ) ??
> |
> | ======= JAVA API =======
> | Class Post:
> | - string: id;
> | - string: title;
> | - string: postContent;
> | - List<Comment> comments;
> | Class Comment:
> | - string username;
> | - string comment;
> |
> | Or would the IMPL expect an 'embedded' _comments_ collection on the
> response
> | of "GET http://some.server.com/posts/1 " ?
>
>
It will not read /posts/1/comments if the Pipe's endpoint is /posts.  If
> you have a comments collection on the post but no comments data in the
> response then the value for getComments will just be null.
>

Ok - so this needs to be tweaked in Java too, since it's very common to
model the REST endpoints like above;

> |
> |
> |
> | On Mon, Apr 8, 2013 at 7:05 PM, Summers Pittman < supittma at redhat.com >
> | wrote:
> |
> |
> | No. The get of pipe 1 would have to include the comments for get
> comments to
> | work
> |
> | Sent from my Android phone using TouchDown ( www.nitrodesk.com )
> |
> |
> | -----Original Message-----
> | From: Matthias Wessendorf [ matzew at apache.org ]
> | Received: Monday, 08 Apr 2013, 12:04PM
> | To: AeroGear Developer Mailing List [ aerogear-dev at lists.jboss.org ]
> | Subject: Re: [aerogear-dev] [Aerogear Pipeline] Support for nested
> endpoints
> |
> |
> | On Mon, Apr 8, 2013 at 5:57 PM, Summers Pittman < supittma at redhat.com >
> | wrote:
> |
> | >
> | >
> | > ----- Original Message -----
> | > | From: "Matthias Wessendorf" < matzew at apache.org >
> | > | To: "AeroGear Developer Mailing List" < aerogear-dev at lists.jboss.org>
> | > | Sent: Monday, April 8, 2013 10:28:46 AM
> | > | Subject: Re: [aerogear-dev] [Aerogear Pipeline] Support for nested
> | > endpoints
> | > |
> | > | or, like before said - reading "lists" (e.g. all the comments for
> | > specific
> | > | blog post):
> | > | https://gist.github.com/matzew/04f069dfbed2cc77a8b4
> | > |
> | > |
> | > | For Java.... I guess...... resolving this URL:
> | > | http://some.server.com/posts/1/comments
> | > |
> | > | could be done with this - right ?
> | > |
> | > | =======
> | > | Class Post:
> | > | - string: title;
> | > | - string: postContent;
> | > | - List<Comment> comments;
> | > | Class Comment:
> | > | - string username;
> | > | - string comment;
> | > |
> | > |
> | > | // get all the comments for 1:
> | > | Post myPostOne = postPipe.read("1");
> | > | myPostOne.getComments();
> | > |
> | > | // get all the comments for 2:
> | > | Post myPostTwo = postPipe.read("2");
> | > | myPostTwo.getComments();
> | > | =======
> | >
> | > It can be done with that yes. My concern was more when we had a Pipe of
> | > type <Post> and a readForResource(String property) method.
> |
> |
> | Ok - one more question
> |
> |
> | So... when doing: myPipe.read(1); does that "only" issue a GET against
> the '
> | http://some.server.com/posts/1 ' resource?
> |
> | A second get, for the comments collection is than issued when calling
> | myPostOne.getComments();?
> | (GET against ' http://some.server.com/posts/1/comments' )?
> |
> |
> |
> |
> | > The type information of the property isn't available unless we can
> infer
> | > it from the Post object.
> | >
> |
> |
> |
> |
> |
> | >
> | >
> | > |
> | > |
> | > | Greetings,
> | > | Matthias
> | > |
> | > |
> | > |
> | > |
> | > |
> | > |
> | > |
> | > | On Fri, Apr 5, 2013 at 2:37 PM, Matthias Wessendorf <
> matzew at apache.org >
> | > | wrote:
> | > |
> | > |
> | > |
> | > | Thought a bit more about it and chatted with friends,
> | > |
> | > | the issue with the sub pipes is: it adds state and is perhaps an API
> | > | construct that is a bit hard to understand (see all the discussions
> here)
> | > |
> | > | Not sure - but currently we can access "kid resources", with our API
> -
> | > right
> | > | ?
> | > |
> | > | https://gist.github.com/matzew/6ab432e437b9a017a21d
> | > |
> | > |
> | > | Perhaps it's better to just keep it that way? This has the benefit of
> | > using
> | > | an established and know API, the different pipes are accessible via
> the
> | > | pipeline object;
> | > |
> | > | And the code is not too much code; it's simply an explicit pipe ...
> | > |
> | > |
> | > |
> | > |
> | > |
> | > |
> | > | On Fri, Apr 5, 2013 at 10:56 AM, Matthias Wessendorf <
> matzew at apache.org
> | > | >
> | > | wrote:
> | > |
> | > |
> | > |
> | > |
> | > |
> | > |
> | > | On Fri, Apr 5, 2013 at 10:52 AM, Sebastien Blanc <
> scm.blanc at gmail.com >
> | > | wrote:
> | > |
> | > |
> | > |
> | > |
> | > |
> | > |
> | > | On Fri, Apr 5, 2013 at 10:36 AM, Matthias Wessendorf <
> matzew at apache.org
> | > | >
> | > | wrote:
> | > |
> | > |
> | > |
> | > |
> | > |
> | > |
> | > | On Fri, Apr 5, 2013 at 10:14 AM, Christos Vasilakis <
> cvasilak at gmail.com
> | > | >
> | > | wrote:
> | > |
> | > |
> | > |
> | > | Hi
> | > |
> | > | some comments
> | > |
> | > | I believe the method can't be used since you don't know the team for
> the
> | > | players so you can't retrieve the pipe directly..right?
> | > |
> | > | Isn't that really up to the impl of the rest service?
> | > | They could return a list of teamsHePlayed for;
> | > |
> | > | So, let's not tie this API to a specific, not existing RESTful
> service;
> | > |
> | > | +1, we don't need to care about that, we must just focus on how we
> can
> | > | declare and call nested pipes.
> | > |
> | > |
> | > |
> | > |
> | > | yep
> | > |
> | > | I guess this is perhaps the closest we can come to :
> | > |
> | > | id<AGPipe> allOwnersInNewYorkPipe = [leaguesPipe subPipe:@"owners"
> | > | for:@"newyork"];
> | > |
> | > | and than.... on the 'leaguesPipe' you can access its kids with
> something
> | > like
> | > | :
> | > |
> | > | NSArray* kids = [leaguesPipe subPipes];
> | > |
> | > |
> | > | However, that adds some state to a specific pipe object
> | > |
> | > |
> | > | -M
> | > |
> | > |
> | > |
> | > |
> | > |
> | > |
> | > |
> | > |
> | > |
> | > |
> | > |
> | > |
> | > |
> | > |
> | > |
> | > | getPlayers ( Callback < List < Player >> callback ) {
> | > | pipe . get ( "player" ). read ( callback );
> | > | }
> | > |
> | > | Further my questions is, how is a third (or arbitrary) nested
> resources
> | > are
> | > | supported? I mean for a url schema like this
> | > |
> | > | soccer.org/leagues/ {id}/teams/{id}/players/{id}
> | > |
> | > | first we access the leagues:
> | > | ---
> | > | getLeagues(Callback<List<Leagues>> callback) {
> | > | pipe.get("leagues").read(callback);
> | > | }
> | > | ---
> | > | then the teams for this league:
> | > | ---
> | > | getTeamsOnLeaque(Leaque league, Callback<List<Team>> callback) {
> | > | pipe.junction("league","team").read(leaque, callback);
> | > | }
> | > | ---
> | > | ..and then we access the "Players" for a "Team":
> | > | ---
> | > | getPlayersOnTeam(Team team, Callback<List<Player>> callback) {
> | > | pipe.junction("team","player").read(team, callback);
> | > | }
> | > | ---
> | > | But where is the "League" information to fill the "/leagues/{id}..."
> | > path?
> | > |
> | > |
> | > | I'd assume the information is 'inherited' out of a given pipe, when
> | > doing the
> | > | 'join'
> | > |
> | > | e.g. like
> | > | myTeamsForLeaguePipe = leaguePipe.junction("team");
> | > |
> | > | not sure...
> | > |
> | > |
> | > |
> | > |
> | > | Unless you mean something like:
> | > | ---
> | > | getPlayersOnTeam(Leaque league, Team team, Callback<List<Player>>
> | > callback) {
> | > | pipe.junction("league", "team","player").read(league, team,
> callback);
> | > | }
> | > |
> | > | I am not sure if that is really easy to understand/use
> | > |
> | > | Yes and the term "junction" is a bit confusing as it don't express
> | > explicitly
> | > | a parent/child relation.
> | > |
> | > |
> | > |
> | > |
> | > |
> | > |
> | > |
> | > | ---
> | > |
> | > | probably I am missing sth..
> | > |
> | > | Thanks,
> | > | Christos
> | > |
> | > | On Apr 4, 2013, at 5:52 PM, Summers Pittman < supittma at redhat.com >
> | > wrote:
> | > |
> | > |
> | > |
> | > | What if we create a new metaphor, a Junction.
> | > |
> | > | https://gist.github.com/secondsun/dcf5682b6ff17c729d9a
> | > |
> | > | It joins two pipes together and can be used over and over again with
> | > | different data?
> | > | It isn't a Pipe though, but perhaps that could be changed to look
> more
> | > like
> | > | Christos's previous example.
> | > |
> | > | At the very least I like the words "junction" or "join" more than
> "of"
> | > |
> | > | ----- Original Message -----
> | > | | From: "Christos Vasilakis" < cvasilak at gmail.com >
> | > | | To: "AeroGear Developer Mailing List" <
> aerogear-dev at lists.jboss.org >
> | > | | Sent: Wednesday, April 3, 2013 3:03:02 AM
> | > | | Subject: Re: [aerogear-dev] [Aerogear Pipeline] Support for nested
> | > | | endpoints
> | > | |
> | > | |
> | > | | On Apr 2, 2013, at 4:03 PM, Matthias Wessendorf <
> matzew at apache.org >
> | > | | wrote:
> | > | |
> | > | |
> | > | |
> | > | |
> | > | | Two thoughts....
> | > | |
> | > | | 1) the 'original' leaguesPipe has no clue about the subpipes,
> right ?
> | > | | 2) should a pipe offer a 'getter' for all it's sub pipes ?
> | > | |
> | > | |
> | > | | Just a thought is instead of using Pipe, to continue using Pipeline
> | > adding
> | > | | an
> | > | | extra parameter " of" for specifying the parent : E.g.:
> | > | |
> | > | | …..
> | > | | id<AGPipe> leaguesPipe = [pipeline pipe@"leagues"];
> | > | |
> | > | | id<AGPipe> allTeamsInSeattlePipe = [pipeline subPipe@"teams" of
> | > | | :leaguesPipe
> | > | | for:@"seattle"]
> | > | |
> | > | | id<AGPipe> allPlayersInTrebuchetPipe = [pipeline subPipe:@
> "players"
> | > of:
> | > | | allTeamsInSeattlePipe for:@"trebuchet"];
> | > | | …..
> | > | |
> | > | |
> | > | | Wdyt?
> | > | |
> | > | |
> | > | |
> | > | |
> | > | |
> | > | |
> | > | |
> | > | | -M
> | > | |
> | > | |
> | > | |
> | > | |
> | > | |
> | > | | Thanks,
> | > | | Christos
> | > | |
> | > | |
> | > | |
> | > | |
> | > | |
> | > | |
> | > | |
> | > | |
> | > | |
> | > | |
> | > | |
> | > | |
> | > | |
> | > | |
> | > | | soccer.org/leagues/seattle/teams/trebuchet/players/foo - >
> | > | | [[pipeline pipe:@"players" pathParams:@[@"seattle", @"trebuchet"]]
> | > read
> | > | | :@"foo"] ..
> | > | | -----
> | > | |
> | > | |
> | > | | Wdyt?
> | > | |
> | > | | Thanks
> | > | | Christos
> | > | |
> | > | | On Mar 18, 2013, at 1:12 PM, Sebastien Blanc < scm.blanc at gmail.com>
> | > wrote:
> | > | |
> | > | |
> | > | |
> | > | | Well, that would not be possible, for that you will have to create
> a
> | > | | "child"
> | > | | pipe. But I agree, that is maybe no optimal ...
> | > | |
> | > | |
> | > | | On Fri, Mar 15, 2013 at 6:44 PM, Summers Pittman <
> supittma at redhat.com
> | > | | >
> | > | | wrote:
> | > | |
> | > | |
> | > | |
> | > | | On 03/15/2013 01:34 PM, Sebastien Blanc wrote:
> | > | |
> | > | |
> | > | | I like the idea but I will more see that has a method/function for
> the
> | > | | pipelineManager (and will be easier to implement in JS, I think) :
> | > | |
> | > | | var myParentPipe =
> | > Aerogear.Pipeline({name:"parentPipe"}).pipes.parentPipe
> | > | |
> | > | | var myChildPipe = Aerogear.Pipeline.fromParent(myParentPipe,
> {options}
> | > )
> | > | | What would it look like to get a child record from a parent?
> | > | |
> | > | |
> | > | |
> | > | |
> | > | |
> | > | |
> | > | | On Fri, Mar 15, 2013 at 5:37 PM, Douglas Campos < qmx at qmx.me >
> wrote:
> | > | |
> | > | |
> | > | | What about this?
> | > | |
> | > | | Pipeline<Post> postPipeline = …
> | > | | Post post = // get from the pipeline
> | > | | Pipeline<Comment>
> | > | | postPipeline.childPipelineForOrOtherWeirdName(Comment.class, post)
> | > | |
> | > | |
> | > | | On 15/03/2013, at 12:26, Summers Pittman < supittma at redhat.com >
> | > wrote:
> | > | |
> | > | | > On 03/14/2013 04:48 AM, Matthias Wessendorf wrote:
> | > | | >>
> | > | | >>
> | > | | >> On Thu, Mar 14, 2013 at 9:32 AM, Sebastien Blanc <
> | > scm.blanc at gmail.com >
> | > | | >> wrote:
> | > | | >> Hi,
> | > | | >> While I was playing with scaffolding and tried to build a simple
> | > Blog
> | > | | >> Application with Aerogear I faced the current situation :
> | > | | >> I have a Post object which contains many Comment objects. Now I
> | > want to
> | > | | >> call my Post pipe to retrieve the related comments, I have
> | > currently 2
> | > | | >> options :
> | > | | >>
> | > | | >> /posts/1 -> assuming comments will be implicitly retrieved
> (eager
> | > | | >> loading)
> | > | | >> /comments/?postid=1
> | > | | >>
> | > | | >> But regarding our model the correct form should be :
> | > | | >>
> | > | | >> /posts/1/comments
> | > | | >>
> | > | | >>
> | > | | >> +1
> | > | | >> that is the ideal way to model URIs for "nested" resources.
> | > | | >>
> | > | | >> See [1], extracted from [2]
> | > | | >>
> | > | | >>
> | > | | >>
> | > | | >> But, AFAIK, with the current API, it is not possible to define
> this
> | > last
> | > | | >> pattern (at least for JS and iOs, confirmed by Matzew). When
> doing a
> | > | | >> read
> | > | | >> we can pass an id option but as mentioned in the doc, this id
> will
> | > | | >> always
> | > | | >> be append to the endpoint.
> | > | | >>
> | > | | >>
> | > | | >> Well, it is possible - but in a very (IMO) ugly way:
> | > | | >>
> | > | | >> https://gist.github.com/matzew/6ab432e437b9a017a21d
> | > | | >>
> | > | | >>
> | > | | >>
> | > | | >>
> | > | | >> IMO, we should be able to support this pattern but for now I'm
> not
> | > | | >> really
> | > | | >> sure how to specify this in our API, so if you have any ideas
> | > feedback
> | > | | >> this thread has been made for you !
> | > | | >>
> | > | | >>
> | > | | >>
> | > | | >> Suggestion: Enhance the read function - example:
> | > | | >>
> | > | | >> https://gist.github.com/matzew/04f069dfbed2cc77a8b4
> | > | | > I'm thinking of the inverse myself. Add a "ParentPath" property
> | > which can
> | > | | > be used to extract information from parent objects.
> | > | | >
> | > | | > https://gist.github.com/secondsun/17ce96082eda37dbd10e
> | > | | >
> | > | | >>
> | > | | >>
> | > | | >> -Matthias
> | > | | >>
> | > | | >>
> | > | | >> [1]
> | > | | >>
> | >
> http://www.infoq.com/resource/articles/rest-introduction/en/resources/figure2.jpg
> | > | | >> [2] http://www.infoq.com/articles/rest-introduction
> | > | | >>
> | > | | >>
> | > | | >>
> | > | | >>
> | > | | >> Seb
> | > | | >>
> | > | | >>
> | > | | >> _______________________________________________
> | > | | >> aerogear-dev mailing list
> | > | | >> aerogear-dev at lists.jboss.org
> | > | | >> https://lists.jboss.org/mailman/listinfo/aerogear-dev
> | > | | >>
> | > | | >>
> | > | | >>
> | > | | >> --
> | > | | >> Matthias Wessendorf
> | > | | >>
> | > | | >> blog: http://matthiaswessendorf.wordpress.com/
> | > | | >> sessions: http://www.slideshare.net/mwessendorf
> | > | | >> twitter: http://twitter.com/mwessendorf
> | > | | >>
> | > | | >> _______________________________________________
> | > | | >> aerogear-dev mailing list
> | > | | >>
> | > | | >> aerogear-dev at lists.jboss.org
> | > | | >> https://lists.jboss.org/mailman/listinfo/aerogear-dev
> | > | | >
> | > | | > _______________________________________________
> | > | | > aerogear-dev mailing list
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> | > | | > https://lists.jboss.org/mailman/listinfo/aerogear-dev
> | > | |
> | > | | -- qmx
> | > | |
> | > | |
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> | > | |
> | > | |
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> | > | |
> | > | |
> | > | | --
> | > | | Matthias Wessendorf
> | > | |
> | > | | blog: http://matthiaswessendorf.wordpress.com/
> | > | | sessions: http://www.slideshare.net/mwessendorf
> | > | | twitter: http://twitter.com/mwessendorf
> | > | | _______________________________________________
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> | > | | https://lists.jboss.org/mailman/listinfo/aerogear-dev
> | > | |
> | > | |
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> | > | | https://lists.jboss.org/mailman/listinfo/aerogear-dev
> | > | |
> | > | |
> | > | |
> | > | | --
> | > | | Matthias Wessendorf
> | > | |
> | > | | blog: http://matthiaswessendorf.wordpress.com/
> | > | | sessions: http://www.slideshare.net/mwessendorf
> | > | | twitter: http://twitter.com/mwessendorf
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> | > | | https://lists.jboss.org/mailman/listinfo/aerogear-dev
> | > | |
> | > | |
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> | > |
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> | > |
> | > |
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> | > |
> | > |
> | > |
> | > | --
> | > | Matthias Wessendorf
> | > |
> | > | blog: http://matthiaswessendorf.wordpress.com/
> | > | sessions: http://www.slideshare.net/mwessendorf
> | > | twitter: http://twitter.com/mwessendorf
> | > |
> | > | _______________________________________________
> | > | aerogear-dev mailing list
> | > | aerogear-dev at lists.jboss.org
> | > | https://lists.jboss.org/mailman/listinfo/aerogear-dev
> | > |
> | > |
> | > | _______________________________________________
> | > | aerogear-dev mailing list
> | > | aerogear-dev at lists.jboss.org
> | > | https://lists.jboss.org/mailman/listinfo/aerogear-dev
> | > |
> | > |
> | > |
> | > | --
> | > | Matthias Wessendorf
> | > |
> | > | blog: http://matthiaswessendorf.wordpress.com/
> | > | sessions: http://www.slideshare.net/mwessendorf
> | > | twitter: http://twitter.com/mwessendorf
> | > |
> | > |
> | > |
> | > | --
> | > | Matthias Wessendorf
> | > |
> | > | blog: http://matthiaswessendorf.wordpress.com/
> | > | sessions: http://www.slideshare.net/mwessendorf
> | > | twitter: http://twitter.com/mwessendorf
> | > |
> | > |
> | > |
> | > | --
> | > | Matthias Wessendorf
> | > |
> | > | blog: http://matthiaswessendorf.wordpress.com/
> | > | sessions: http://www.slideshare.net/mwessendorf
> | > | twitter: http://twitter.com/mwessendorf
> | > |
> | > | _______________________________________________
> | > | aerogear-dev mailing list
> | > | aerogear-dev at lists.jboss.org
> | > | https://lists.jboss.org/mailman/listinfo/aerogear-dev
> | >
> | > _______________________________________________
> | > aerogear-dev mailing list
> | > aerogear-dev at lists.jboss.org
> | > https://lists.jboss.org/mailman/listinfo/aerogear-dev
> | >
> |
> |
> |
> | --
> | Matthias Wessendorf
> |
> | blog: http://matthiaswessendorf.wordpress.com/
> | sessions: http://www.slideshare.net/mwessendorf
> | twitter: http://twitter.com/mwessendorf
> |
> | _______________________________________________
> | aerogear-dev mailing list
> | aerogear-dev at lists.jboss.org
> | https://lists.jboss.org/mailman/listinfo/aerogear-dev
> |
> |
> |
> | --
> | Matthias Wessendorf
> |
> | blog: http://matthiaswessendorf.wordpress.com/
> | sessions: http://www.slideshare.net/mwessendorf
> | twitter: http://twitter.com/mwessendorf
> |
> | _______________________________________________
> | aerogear-dev mailing list
> | aerogear-dev at lists.jboss.org
> | https://lists.jboss.org/mailman/listinfo/aerogear-dev
>
> _______________________________________________
> aerogear-dev mailing list
> aerogear-dev at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/aerogear-dev
>

-- 
Matthias Wessendorf

blog: http://matthiaswessendorf.wordpress.com/
sessions: http://www.slideshare.net/mwessendorf
twitter: http://twitter.com/mwessendorf
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