secondo/bin/Scripts/ParTraj.psec

/*
1 Creating a Database

*/

create database taxis;
open database taxis;

/*
Adapt the following:

*/
restore Workers from WorkersNewton;

let NSlots = 40;
let NSlots2 = 120;
let myPort = 1238

/*
2 Data Import 

2.1 Sequential Import and Distribution from the Master

*/

let Start = createintdarray("Start", Workers);
delete Start;

let RawDataById =
  [const rel(tuple([Id: int, DateTime: string, Point: string])) value ()]
  csvimport['cabsrome/taxidata00', 0, "", ";", FALSE, FALSE]
  projectextend[Id
  ; Inst: str2instant(substr(.DateTime, 1, 10) + "-" + substr(.DateTime, 12, 23)),
    Pos: makepoint(
      str2real(
        substr(.Point, findFirst(.Point, " ") + 1, findFirst(.Point, ")") - 1)),
      str2real(
        substr(.Point, findFirst(.Point, "(") + 1,  findFirst(.Point, " ") - 1))  
  )]
  ddistribute4["RawDataById", hashvalue(.Id, 999997) , NSlots, Workers]
  
/*
3 Creating Moving Objects

*/
  
let CabsTrips = RawDataById 
  dmap["CabsTrips", 
    . feed sortby[Id, Inst] 
    groupby[Id; TotalTrip: group feed 
      approximate[Inst, Pos, TRUE, create_duration(0, 60000)] 
      removeNoise[35.0, 2000.0, create_geoid("WGS1984")] ]
    projectextendstream[Id; Trip: .TotalTrip 
      sim_trips[create_duration(0, 180000), 100.0, create_geoid("WGS1984")] ]
    filter[no_components(.Trip) > 1]
    consume
  ]

/*
4 Multiplying the Dataset

*/
let bboxR = CabsTrips
  dmap["", . feed projectextend[; Box: bbox(.Trip)] transformstream 
    collect_box[FALSE]] 
  dsummarize collect_box[FALSE]

let deltax = maxD(bboxR, 1) - minD(bboxR, 1);
let deltay = maxD(bboxR, 2) - minD(bboxR, 2)

query share("deltax", TRUE, Workers);
query share("deltay", TRUE, Workers);

let CabsId = CabsTrips
  dmap["", . feed 
    loopsel[fun(t: TUPLE)
      intstream(0, 4) namedtransformstream[Nx]
      intstream(0, 1) namedtransformstream[Ny]
      product
      projectextend[
      ; Id: attr(t, Id) + ((5 * .Ny) + .Nx) * 1000,
        Trip: attr(t, Trip) 
          translate[[const duration value (0 0)], .Nx * deltax, .Ny * deltay]]
    ]
  ]
  partition["", hashvalue(.Id, 999997), 0]
  collect2["", myPort]
  dmap["CabsId", . feed consume]
  
/*
5 Partitioning

5.1 Partitioning by Object identifier

5.2 Spatio-temporal Partitioning

*/

let bboxR10 = CabsId
  dmap["", . feed projectextend[; Box: bbox(.Trip)] transformstream 
    collect_box[TRUE]] 
  dsummarize collect_box[TRUE]
  
let grid = createCellGrid3D(11.0, 41.0, 5140.0, 2.0, 1.5, 5.0, 4, 2)

query share("grid", TRUE, Workers)

let CabsST = CabsId 
  partitionF["", . feed 
    extendstream[Cell: cellnumber(bbox(.Trip), grid)]
    extend[Box: bbox(.Trip)], 
    ..Cell, 0]
  collect2["", myPort]
  dmap["CabsST", . feed consume]

/*
6 Indexing

6.1 By Identifier

*/

let CabsId_Id_btree = CabsId dmap["CabsId_Id_btree", . createbtree[Id]]

/*
6.2 By Spatio-temporal Information

*/
let CabsST_Trip_rtree = CabsST
  dmap["CabsST_Trip_rtree",  . feed addid  
    extend[ScaledBox: scalerect(.Box, 1000000.0, 1000000.0, 1000.0)]
    sortby[ScaledBox]
    remove[ScaledBox]
    bulkloadrtree[Box]
  ]
  
/*
7 Querying

7.1 By Identifier

*/
query CabsId_Id_btree CabsId
  dmap2["", . .. exactmatch[11], myPort] 
  dsummarize consume

/*
7.2 By Spatio-temporal Dimension

*/

let qObject = rectangle3(12.464446, 12.5013, 41.879938, 41.911759, 
  instant2real(theInstant(2014, 02, 01, 19)),
  instant2real(theInstant(2014, 02, 01, 20)));

query share("qObject", TRUE, Workers)

query CabsST_Trip_rtree CabsST
  dmap2["", . .. windowintersects[qObject] 
    filter[gridintersects(grid, qObject, bbox(.Trip), .Cell)]
    filter[.Trip passes rectproject(qObject, 1, 2) rect2region]
    filter[.Trip present rect2periods(qObject)], 
  myPort]
  dsummarize consume

query hashvalue(11, 999997);
query cellnumber(qObject, grid) consume

query hashvalue(11, 999997) feed CabsId_Id_btree CabsId
  pdmap2["", . .. exactmatch[11], myPort] 
  dsummarize consume
  
query cellnumber(qObject, grid) CabsST_Trip_rtree CabsST
  pdmap2["", . .. windowintersects[qObject] 
    filter[gridintersects(grid, qObject, bbox(.Trip), .Cell)]
    filter[.Trip passes rectproject(qObject, 1, 2) rect2region]
    filter[.Trip present rect2periods(qObject)], myPort]
  dsummarize consume