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# RingBuffer class: | |
# https://github.com/celluloid/celluloid/blob/master/lib/celluloid/logging/ring_buffer.rb | |
# added the moving average method | |
class RingBuffer | |
attr_reader :buffer | |
def initialize(size) | |
@size = size | |
@start = 0 | |
@count = 0 | |
@buffer = Array.new(size) | |
@mutex = Mutex.new | |
end | |
def full? | |
@count == @size | |
end | |
# calculates the mean average of all the values in the buffer provided that | |
# the buffer is already full | |
def average | |
if self.full? | |
@buffer.inject{ |sum, el| sum + el }.to_f / @size | |
end | |
end | |
def empty? | |
@count == 0 | |
end | |
def push(value) | |
@mutex.synchronize do | |
stop = (@start + @count) % @size | |
@buffer[stop] = value | |
if full? | |
@start = (@start + 1) % @size | |
else | |
@count += 1 | |
end | |
value | |
end | |
end | |
alias :<< :push | |
def shift | |
@mutex.synchronize do | |
remove_element | |
end | |
end | |
def flush | |
values = [] | |
@mutex.synchronize do | |
while !empty? | |
values << remove_element | |
end | |
end | |
values | |
end | |
def clear | |
@buffer = Array.new(@size) | |
@start = 0 | |
@count = 0 | |
end | |
private | |
def remove_element | |
return nil if empty? | |
value, @buffer[@start] = @buffer[@start], nil | |
@start = (@start + 1) % @size | |
@count -= 1 | |
value | |
end | |
end |
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