Created
October 4, 2016 13:30
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RingBuffer
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| /** | |
| * Implementation of a ring buffer optimised for our use case. | |
| * There is minimum check and it's not thread safe | |
| */ | |
| class Ring[T: reflect.ClassTag](size: Int) { | |
| import java.lang.ArrayIndexOutOfBoundsException | |
| protected val buffer = Array.ofDim[T](size) | |
| protected var first: Int = 0 | |
| protected var last: Int = -1 | |
| var count: Int = 0 | |
| def head: T = | |
| if( count > 0 ) buffer(first) | |
| else throw new ArrayIndexOutOfBoundsException("Empty ring") | |
| def add(value: T): Unit = { | |
| if( count < size ) { | |
| last = (last + 1) % size | |
| buffer(last) = value | |
| count += 1 | |
| } else throw new ArrayIndexOutOfBoundsException("Full ring") | |
| } | |
| @annotation.tailrec | |
| final def dropWhile(f: T => Boolean): Unit = { | |
| if( count > 0 && f(head) ) { | |
| first = (first + 1) % size | |
| count -= 1 | |
| dropWhile(f) | |
| } | |
| } | |
| } |
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