Apama HTTPClient适配器中的JSON响应解析

Question

我想使用apama中的HTTPClient适配器解析来自HTTP REST调用的JSON响应。响应字符串如下：

{
    "geometry": {
                "type": "MultiPolygon",
                "cordinates": [
                                [   
                                    [
                                        [
                                            -2.420261362208627,
                                            51.29662513520916
                                        ],
                                        [
                                            -2.42211658046158,
                                            51.28747916639892
                                        ],
                                        [
                                            -2.439047101373828,
                                            51.28519049850415
                                        ],
                                        [
                                            -2.453288677334455,
                                            51.273848703615954
                                        ]
                                    ]
                                ]   
                            ]
            },          
      "properties": {
                "name": "Bath and NE Somerset",
                "public_name": "Bath and North East Somerset",
                "region": "South West",
                "public_region": "South West"
            }
}

我为此编写了一个事件定义，如下所示

event E {


 dictionary<string,dictionary<dictionary<string,string>,dictionary<string,sequence<sequence<sequence<sequence<float > > > > > > > geometry;

dictionary<string,string> properties;
    }

但是在运行时，它给出了错误:期望的是map，但是得到了一个列表。

请帮帮忙。

Answer 1

您将几何体视为字符串键和字典值的字典。这不是真的，因为第一个条目是string:string对。您可能更适合声明事件类型，如下所示：

event Geometry {
    string type;
    sequence<sequence<sequence<sequence<float> > > > coordinates;
}

event E {
    Geometry geometry;
    dictionary<string,string> properties;
}