window example
Blake Mizerany
11 years ago
| 7 | 7 | "log" |
| 8 | 8 | "os" |
| 9 | 9 | "strconv" |
| 10 | "time" | |
| 10 | 11 | ) |
| 11 | 12 | |
| 12 | 13 | func Example_simple() { |
| 56 | 57 | fmt.Println("perc50:", q.Query(0.90)) |
| 57 | 58 | } |
| 58 | 59 | |
| 60 | func Example_window() { | |
| 61 | // Scenario: We want the 90th, 95th, and 99th percentiles for each | |
| 62 | // minute. | |
| 63 | ||
| 64 | ch := make(chan float64) | |
| 65 | go readStreamValues(ch) | |
| 66 | ||
| 67 | tick := time.NewTicker(1 * time.Minute) | |
| 68 | q := quantile.NewTargeted(0.90, 0.95, 0.99) | |
| 69 | for { | |
| 70 | select { | |
| 71 | case t := <-tick.C: | |
| 72 | flushToDB(t, q.Samples()) | |
| 73 | q.Reset() | |
| 74 | case v := <-ch: | |
| 75 | q.Insert(v) | |
| 76 | } | |
| 77 | } | |
| 78 | } | |
| 79 | ||
| 80 | func readStreamValues(ch chan float64) { | |
| 81 | // Use your imagination | |
| 82 | } | |
| 83 | ||
| 84 | func flushToDB(t time.Time, samples quantile.Samples) { | |
| 85 | // Use your imagination | |
| 86 | } | |
| 87 | ||
| 59 | 88 | // This is a stub for the above example. In reality this would hit the remote |
| 60 | 89 | // servers via http or something like it. |
| 61 | 90 | func getDBQuerySamples(ch chan quantile.Samples) {} |