带有 georel 表达式的 Fiware orion 订阅

Question

我的 Orion 数据库中有一个实体：

{
  "id"=>"User-121",
  "type"=>"User",
  "location"=>{
    "type"=>"geo:point", 
    "value"=>"59.851484, 30.199463"
  }, 
  "time"=>{"type"=>"none", "value"=>222909, "metadata"=>{}}
}

此外，我有 3 个订阅此实体，它们在条件表达式中具有相同的坐标：

Should trigger when the entity is located, at least 100 meters far away from the reference point.

{
  "id"=>"...",
  "expires"=>"...",
  "status"=>"active",
  "subject"=>{
    "entities"=>[{"id"=>"User-121", "idPattern"=>"", "type"=>"User"}],
    "condition"=>{
      "attributes"=>["location", "time"], 
      "expression"=>{
        "q"=>"", 
        "geometry"=>"point", 
        "coords"=>"59.851484, 30.199463", 
        "georel"=>"near;minDistance:100"}
    }
  },
  "notification"=>{
    "callback"=>"http://callback", 
    "attributes"=>["time"]
  }
}

Should trigger when the entity is located, at a maximum, 100 meters far away from the reference point

{
  "id"=>"...",
  "expires"=>"...",
  "status"=>"active",
  "subject"=>{
    "entities"=>[{"id"=>"User-121", "idPattern"=>"", "type"=>"User"}],
    "condition"=>{
      "attributes"=>["location", "time"], 
      "expression"=>{
        "q"=>"", 
        "geometry"=>"point", 
        "coords"=>"59.851484, 30.199463", 
        "georel"=>"near;maxDistance:100"}
    }
  },
  "notification"=>{
    "callback"=>"http://callback",  
    "attributes"=>["time"]
  }
},

Should trigger when the entity is located at the reference point (has the same coordinates)

{
  "id"=>"...",
  "expires"=>"...",
  "status"=>"active",
  "subject"=>{
    "entities"=>[{"id"=>"User-121", "idPattern"=>"", "type"=>"User"}],
    "condition"=>{
      "attributes"=>["location", "time"], 
      "expression"=>{
        "q"=>"", 
        "geometry"=>"point", 
        "coords"=>"59.851484, 30.199463", 
        "georel"=>"equals"}
    }
  },
  "notification"=>{
    "callback"=>"http://callback", 
    "attributes"=>["time"]
  }
}

问题是每次我更新实体时，所有订阅都会发送通知。它甚至不依赖于实体的坐标值。无论坐标是什么，我总是收到 3 个更新通知。

我做错了什么？

Orion Context Broker 版本为 0.28.0（git 版本：5c1afdb3dd748580f10e1809f82462d83d2a17d4）

Answer 1

NGSIv2 订阅中的地理位置功能尚未实现（Orion 0.28.0）。请注意，NGSIv2 仍处于测试状态，有时 the specification（其中 geometry、georel 和 coords 被定义为 expression 的一部分）是向前迈出的一步实施。

有关于此的 a github issue，您可以订阅以了解此功能何时实施。

编辑：NGSIv2 订阅中的地理位置功能将在 Orion 1.3.0 中可用（将于 8 月底或 9 月初发布）。如果您不想等待，请注意该功能在开发分支中也可用（以及关联的 Docker）。

带有 georel 表达式的 Fiware orion 订阅

Fiware orion subscription with georel expression in condition

fiware-orion

fiware