C-SPARQL:Hands on Session Marco Balduini marco.balduini@polimi.it - - PowerPoint PPT Presentation

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C-SPARQL:Hands on Session Marco Balduini marco.balduini@polimi.it - - PowerPoint PPT Presentation

Jan 22, 2024 157 likes •463 views

Stream Reasoning For Linked Data M. Balduini, J-P Calbimonte, O. Corcho, D. Dell'Aglio, E. Della Valle, and J.Z. Pan http://streamreasoning.org/sr4ld2013 C-SPARQL:Hands on Session Marco Balduini marco.balduini@polimi.it Share, Remix, Reuse

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SLIDE 1

Stream Reasoning For Linked Data

  • M. Balduini, J-P Calbimonte, O. Corcho,
  • D. Dell'Aglio, E. Della Valle, and J.Z. Pan

http://streamreasoning.org/sr4ld2013

C-SPARQL:Hands on Session

Marco Balduini marco.balduini@polimi.it

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SLIDE 2

http://streamreasoning.org/sr4ld2013

Share, Remix, Reuse — Legally

§ This work is licensed under the Creative Commons Attribution 3.0 Unported License. § Your are free:

  • to Share — to copy, distribute and transmit the work
  • to Remix — to adapt the work

§ Under the following conditions

  • Attribution — You must attribute the work by inserting

– “[source http://streamreasoning.org/sr4ld2013]” at the end of each reused slide – a credits slide stating

  • These slides are partially based on “Streaming Reasoning for Linked

Data 2013” by M. Balduini, J-P Calbimonte, O. Corcho, D. Dell'Aglio,

  • E. Della Valle, and J.Z. Pan http://streamreasoning.org/sr4ld2013

§ To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/

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http://streamreasoning.org/sr4ld2013

Schema Reminder

Observation Sensor Person Post Room where who

  • bserves

subClassOf subClassOf posts subPropOf

Streaming information Background information

isWith isIn

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http://streamreasoning.org/sr4ld2013

RDF Stream Processors Services

§ Implementation of RSP Services protocol for C-SPARQL Engine

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http://streamreasoning.org/sr4ld2013

Package Content

§ RSP_Services_CSPARQL folder

  • rsp-services-csparql-0.3.2.3.jar : executable jar containing

the implemantation of rsp-services for the C-SPARQL Engine

– To start it run rsp-services-csparql.sh (Unix)

  • r rsp-services-csparql.bat (Windows)

§ Http2Sysout

  • http2sysout-0.1.jar : executable jar containing a simple

program to receive results over HTTP and print the received data on system out.

– To start it run http2sysout.sh (Unix)

  • r http2sysout.bat (Windows)

§ SR4LD2013_Data.txt : a txt file containing all the exercises data (Descriptions, URLs, queries etc…) § Java rest client

  • To start it type : java –jar restclient-ui-3.2.1-jar-with-

dependencies.jar

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http://streamreasoning.org/sr4ld2013

Program

  • 1. Foursquare IsIn example
  • We will illustrate a guided example that checks who is in each
  • room. The input RDF stream contains “Foursquare” check-in
  • actions. The query we register produces an RDF stream.
  • 2. Facebook IsWith exercise
  • You will be asked to create a pipeline to check who is with
  • whom. The input RDF stream contains “Facebook” posts. The

query has to produce an RDF stream.

  • 3. IsInWith example
  • We will illustrate a guided example that checks, for each

room, who is with whom. As inputs, we will use the streams

  • f the first two exercises. The query we register produces an

RDF stream.

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http://streamreasoning.org/sr4ld2013

Legend

id id id

Stream: an RDF stream in the Engine. The id is specified by the user during the registration process C-SPARQL Query: the id is specified by the user during registration process Observer: the query result from the Engine. The id is assigned by the engine during the registration process

id

Producer/Consumer: object that pushes data into specified stream (Producer) or receives data from

  • bserver (Consumer)

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http://streamreasoning.org/sr4ld2013

Foursquare IsIn example

P1 isInFs Query ../fs C1 RSP-services

BlueRoom

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Bob

4

Foursquare

HTTP HTTP

  • bs1

Example that checks who is in each room using “Foursquare” check-in actions

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http://streamreasoning.org/sr4ld2013

Foursquare IsIn example

P1 isInFs Query ../fs C1 RSP-services

BlueRoom

f

Bob

f

Foursquare

HTTP HTTP

  • bs1

Example that checks who is in each room using “Foursquare” check-in actions

In the following examples the producer is the REST client

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http://streamreasoning.org/sr4ld2013

Foursquare IsIn example

P1 isInFs Query ../fs C1 RSP-services

BlueRoom

f

Bob

f

Foursquare

HTTP HTTP

  • bs1

Example that checks who is in each room using “Foursquare” check-in actions

In the following examples the consumer is http2sysout

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http://streamreasoning.org/sr4ld2013

Foursquare IsIn example

  • 1. Register the input RDF stream into the C-SPARQL engine

PUT http://localhost:8175/streams/http%3A%2F%2Fex.org%2Ffs

  • http%3A%2F%2Fex.org%2Ffs is the encoded version of the

stream name (http://ex.org/fs). This is the unique id of the stream

  • Every registered stream could be used in a query into the

FROM STREAM clause

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http://streamreasoning.org/sr4ld2013

Foursquare IsIn example

  • 2. Register a new query into the C-SPARQL engine

PUT http://localhost:8175/queries/IsInFs REGISTER STREAM IsInFs AS PREFIX : <http://.../sr4ld2013-onto#> CONSTRUCT { ?person :isIn ?room } FROM STREAM <http://ex.org/fs> [RANGE 1m STEP 10s] WHERE { ?person :posts [ :who ?person ; :where ? room ] .}

  • IsInFsQuery represents the name of the query and its unique

id

  • The parameter of the HTTP PUT body must be the query
  • The name given in the REGISTER STREAM clause must be the

same one specified in the URL

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http://streamreasoning.org/sr4ld2013

Foursquare IsIn example

  • 3. Register a new observer for the IsInFsQuery query

POST http://localhost:8175/queries/IsInFs http://localhost:8176/http2sysout

  • The parameter of the HTTP POST body must be the callback

URL.

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Foursquare IsIn example

  • 4. Feed the input RDF stream

POST http://localhost:8175/streams/http%3A%2F%2Fex.org%2Ffs @prefix : <http://.../sr4ld2013-onto# > . :Bob :posts [ :who :Bob ; :where :BlueRoom ] .

  • The parameter of the HTTP POST body must be the data to

be pushed into stream.

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http://streamreasoning.org/sr4ld2013

Foursquare IsIn example

§ Now wait to see the result on the system out console (produced by the http2sysout printer) § Expected Result: { "http://.../sr4ld2013-onto# Bob" : { "http://.../sr4ld2013-onto# isIn" : [ { "type" : "uri" , "value" : "http://.../sr4ld2013-onto# BlueRoom" } ] }

}

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What We Have Learnt

  • 1. Register a new RDF stream into the C-SPARQL engine

PUT http://localhost:8175/streams/<stream_URI>

  • 2. Register a new query into the C-SPARQL engine

PUT http://localhost:8175/queries/<query_name>

  • 3. Add an Observer to a query to retrieve the results

POST http://localhost:8175/queries/<query_name>

  • 4. Feed a registered RDF stream

POST http://localhost:8175/streams/<stream_URI>

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http://streamreasoning.org/sr4ld2013

Facebook IsWith exercise

P2 iswithFb Query ../fb C2 RSP-services

BlueRoom

f

Carl

f

Facebook

HTTP HTTP

  • bs2

Bob is with Create a pipeline that checks who is with whom using “Facebook” posts

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Solution to Facebook IsWith exercise

  • 1. Register the input RDF stream into the C-SPARQL engine

PUT http://localhost:8175/streams/http%3A%2F%2Fex.org%2Ffb

  • http%3A%2F%2Fex.org%2Ffb is the encoded version of the

stream name (http://ex.org/fb). This is the unique id of the stream

  • Every registered stream could be use in a query into FROM

STREAM clause

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Solution to Facebook IsWith exercise

  • 2. Register a new query into the C-SPARQL engine

PUT http://localhost:8175/queries/isWithFb REGISTER STREAM isWithFb AS PREFIX : <http://.../sr4ld2013-onto#> CONSTRUCT { ?person1 :isWith ?person } FROM STREAM <http://ex.org/fb> [RANGE 1m STEP 10s] WHERE { ?person1 :posts [ :who ?person1, ?person ]. FILTER (?person1!=?person)}

  • IsWithFbQuery represents the name of the query and its

unique id

  • The parameter of the HTTP PUT body must be the query
  • The name given in the REGISTER STREAM clause must be the

same one specified in the URL

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http://streamreasoning.org/sr4ld2013

Solution to Facebook IsWith exercise

  • 3. Register a new observer for the isWithFbQuery query

POST http://localhost:8175/queries/isWithFb http://localhost:8176/http2sysout

  • The parameter of the HTTP POST body must be the callback

URL.

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Solution to Facebook IsWith exercise

  • 4. Feed the input RDF stream

POST http://localhost:8175/streams/http%3A%2F%2Fex.org%2Ffb @prefix : <http://.../sr4ld2013-onto# > . :Carl :posts [ :who :Carl , :Bob ] .

  • The parameter of the HTTP POST body must be the data to

be pushed into stream.

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Solution to Facebook IsWith exercise

§ Now wait to see the result on the system out console (produced by the http2sysout printer) § Expected Result { "http://.../sr4ld2013-onto# Carl" : { "http://.../sr4ld2013-onto# isWith" : [ { "type" : "uri" , "value" : “http://.../sr4ld2013-onto# Bob” } ] } }

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http://streamreasoning.org/sr4ld2013

IsInWith Example

isInwith Query

../IsInFs Query

C3 RSP-services

BlueRoom

f

Carl

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Foursquare

HTTP

  • bs3

4

Bob is with

f

../isWithFb Query

Example that checks who are in each room together using the stream produced by previous queries Facebook

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http://streamreasoning.org/sr4ld2013

IsInWith Example

  • 1. Register a new query into the C-SPARQL engine

PUT http://localhost:8175/queries/isInWith REGISTER STREAM isInWith AS PREFIX : <http://.../sr4ld2013-onto#> CONSTRUCT { ?person :isIn ?room } FROM STREAM <http://localhost:8175/streams/ IsInFsQuery> [RANGE 1m STEP 10s] FROM STREAM <http://localhost:8175/streams/ isWithFbQuery> [RANGE 1m STEP 10s] WHERE { { ?person :isWith ?person1 . ?person1 :isIn ?room . FILTER (?person1!=?person) } }

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IsInWith Example

  • 2. Register a new observer for the isInWithQuery query

POST http://localhost:8175/queries/isInWith http://localhost:8177/http2sysout

  • The parameter of the HTTP POST body must be the callback

URL.

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IsInWith Example

  • 3. Feed the input streams

POST http://localhost:8175/streams/http%3A%2F%2Fex.org%2Ffs @prefix : <http://.../sr4ld2013-onto# > . :Bob :posts [ :who :Bob ; :where :BlueRoom ] . POST http://localhost:8175/streams/http%3A%2F%2Fex.org%2Ffb @prefix : <http://.../sr4ld2013-onto# > . :Carl :posts [ :who :Carl , :Bob ] .

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IsInWith Example § Now wait to see the result on the system out console (produced by the http2sysout printer)

§ Expected Result

{ "http://…/sr4ld2013-onto#Carl" : { "http://…/sr4ld2013-onto#isIn" : [ { "type" : "uri" , "value" : "http://…/sr4ld2013-onto#BlueRoom" } ] } }

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What We Have Learnt

  • 1. Register a new RDF stream into the C-SPARQL engine

PUT http://localhost:8175/streams/<stream_URI>

  • 2. Register a new query into the C-SPARQL engine

PUT http://localhost:8175/queries/<query_name>

  • 3. Add an Observer to a query to retrieve the results

POST http://localhost:8175/queries/<query_name>

  • 4. Feed a registered RDF stream

POST http://localhost:8175/streams/<stream_URI>

  • 5. Perform a query chain
  • 6. Explore base features of CSPARQL Engine

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Stream Reasoning For Linked Data

  • M. Balduini, J-P Calbimonte, O. Corcho,
  • D. Dell'Aglio, E. Della Valle, and J.Z. Pan

http://streamreasoning.org/sr4ld2013

C-SPARQL:Hands on Session

Marco Balduini marco.balduini@polimi.it