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Merge pull request #6 from nathanntg/meters
Input and output level meters
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| // | ||
| // SummaryStat.swift | ||
| // SyllableDetector | ||
| // | ||
| // Created by Nathan Perkins on 11/11/15. | ||
| // Copyright © 2015 Gardner Lab. All rights reserved. | ||
| // | ||
|
|
||
| import Foundation | ||
|
|
||
| protocol Stat | ||
| { | ||
| mutating func appendValue(value: Double) | ||
| func readStat() -> Double? | ||
| mutating func resetStat() | ||
| } | ||
|
|
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| struct StatMean: Stat | ||
| { | ||
| var sum: Double = 0.0 | ||
| var count: Int = 0 | ||
|
|
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| mutating func appendValue(value: Double) { | ||
| sum += value | ||
| ++count | ||
| } | ||
|
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| func readStat() -> Double? { | ||
| guard 0 < count else { return nil } | ||
| return sum / Double(count) | ||
| } | ||
|
|
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| mutating func resetStat() { | ||
| sum = 0.0 | ||
| count = 0 | ||
| } | ||
| } | ||
|
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| struct StatMax: Stat | ||
| { | ||
| var largest: Double? | ||
|
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| mutating func appendValue(value: Double) { | ||
| if let cur = largest { | ||
| if value > cur { | ||
| largest = value | ||
| } | ||
| } | ||
| else { | ||
| largest = value | ||
| } | ||
| } | ||
|
|
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| func readStat() -> Double? { | ||
| return largest | ||
| } | ||
|
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| mutating func resetStat() { | ||
| largest = nil | ||
| } | ||
| } | ||
|
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| class SummaryStat | ||
| { | ||
| private var stat: Stat | ||
| private var queue: dispatch_queue_t | ||
|
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| init(withStat stat: Stat) { | ||
| self.stat = stat | ||
| self.queue = dispatch_queue_create("SummaryStat\(stat)", DISPATCH_QUEUE_SERIAL) | ||
| } | ||
|
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| func writeValue(value: Double) { | ||
| dispatch_async(queue) { | ||
| self.stat.appendValue(value) | ||
| } | ||
| } | ||
|
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| func readStatAndReset() -> Double? { | ||
| var ret: Double? | ||
| dispatch_sync(queue) { | ||
| ret = self.stat.readStat() | ||
| self.stat.resetStat() | ||
| } | ||
| return ret | ||
| } | ||
| } |
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