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require 'concurrent/channel/buffer/base'
module Concurrent
class Channel
module Buffer
# A non-blocking, buffered buffer of fixed maximum capacity. When the
# maximum capacity is reached subsequent {#put} and {#offer} operations
# will complete and the item will be `put`, but the oldest elements in
# the buffer will be discarded (not transferred).
class Sliding < Buffered
# @!method put(item)
# @!macro channel_buffer_put
#
# When the buffer is full, this method will return `true`
# immediately and the item will be inserted, but the oldest
# elements in the buffer will be discarded (not transferred).
# @!method offer(item)
# @!macro channel_buffer_offer
#
# When the buffer is full, this method will return `true`
# immediately and the item will be inserted, but the oldest
# elements in the buffer will be discarded (not transferred).
# @!method full?
# @!macro channel_buffer_full_question
#
# Always returns `false`.
# @!macro channel_buffer_blocking_question
#
# Always returns `false`.
def blocking?
false
end
private
# @!macro channel_buffer_full_question
def ns_full?
false
end
# @!macro channel_buffer_put
def ns_put_onto_buffer(item)
buffer.shift if buffer.size == capacity
buffer.push(item)
end
end
end
end
end
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