我有一个系统中发生的事件列表。我的目标是获取事件列表并创建系列的滑动窗口以确定事件发生率。事件从问题范围之外的应用程序加载到事件列表中。
因为系统可以同时接收来自多个源的事件,所以一些事件发生的时间戳(我用作系列键的值)是相同的。实现这一目标的正确方法是什么?
这是我得到的错误:
An unhandled exception of type 'System.ArgumentException' occurred in Deedle.dll
Additional information: Duplicate key '6/12/2015 3:14:43 AM'. Duplicate keys are not allowed in the index.
我的代码:
let mutable events = new ResizeArray<StreamEvent>()
let getSeries =
let eventsKvp = events |> Seq.map(fun(event) -> new KeyValuePair<DateTime,StreamEvent>(event.OccuredAt,event))
let series = Series(eventsKvp)
series |> Series.windowDist (TimeSpan(0, 0, 0,30))
更新#1
这里没有描述的是一些 C# 代码,它实例化了一些 F# Stream 对象并通过 Stream.ProcessEvent 方法添加事件。该代码对我在这里遇到的问题并不重要。
我不再遇到重复密钥问题,但出现Additional information: Floating window aggregation and chunking is only supported on ordered indices.
错误。
更新 #2 我需要使用 sortByKey 而不是排序。
这是我的 F# 代码:
namespace Storck.Data
open System
open System.Collections.Generic
open Deedle
type EventType =
| ClientConnected
| ClientDisconnect
type Edge(id:string,streamId:string) =
member this.Id = id
member this.StreamId = streamId
member this.Edges = new ResizeArray<Edge>()
type StreamEvent(id:string,originStreamId:string,eventType:EventType,ocurredAt:DateTime) =
member this.Id = id
member this.Origin = originStreamId
member this.EventType = eventType
member this.OccuredAt = ocurredAt
override this.Equals(o) =
match o with
| :? StreamEvent as sc -> this.Id = sc.Id
| _ -> false
override this.GetHashCode() =
id.GetHashCode()
interface System.IComparable with
member this.CompareTo(o) =
match o with
| :? StreamEvent as sc -> compare this.Id sc.Id
| _ -> -1
type Client(id:string) =
member this.Id=id
type Key =
| Key of DateTime * string
static member (-) (Key(a, _), Key(b, _)) = a - b
override x.ToString() = let (Key(d, s)) = x in d.ToString() + ", " + s
type Stream(id:string, origin:string) =
let mutable clients = new ResizeArray<Client>()
let mutable events = new ResizeArray<StreamEvent>()
member this.Events = clients.AsReadOnly()
member this.Clients = clients.AsReadOnly()
member this.Id = id
member this.Origin = origin
member this.Edges = new ResizeArray<Edge>()
member this.ProcessEvent(client:Client,event:StreamEvent) =
match event.EventType with
|EventType.ClientConnected ->
events.Add(event)
clients.Add(client)
true
|EventType.ClientDisconnect ->
events.Add(event)
let clientToRemove = clients |> Seq.find(fun(f)-> f.Id = client.Id)
clients.Remove(clientToRemove)
member this.GetSeries() =
let ts = series [ for e in events -> Key(e.OccuredAt, e.Id) => e ]
ts |> Series.sortByKey |> Series.windowDist (TimeSpan(0, 0, 0,30))