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require 'forwardable'
require 'ostruct'
module ZMQ
class PollItems
include Enumerable
extend Forwardable
def_delegators :@pollables, :size, :empty?
def initialize
@pollables = {}
@item_size = LibZMQ::PollItem.size
@item_store = nil
end
def address
clean
@item_store
end
def get pollable
return unless entry = @pollables[pollable]
clean
pointer = @item_store + (@item_size * entry.index)
item = ZMQ::PollItem.from_pointer(pointer)
item.pollable = pollable
item
end
alias :[] :get
def <<(poll_item)
@dirty = true
@pollables[poll_item.pollable] = OpenStruct.new(:index => size, :data => poll_item)
end
alias :push :<<
def delete pollable
if @pollables.delete(pollable)
@dirty = true
clean
true
else
false
end
end
def each &blk
clean
@pollables.each_key do |pollable|
yield get(pollable)
end
end
def inspect
clean
str = ""
each { |item| str << "ptr [#{item[:socket]}], events [#{item[:events]}], revents [#{item[:revents]}], " }
str.chop.chop
end
def to_s; inspect; end
private
# Allocate a contiguous chunk of memory and copy over the PollItem structs
# to this block. Note that the old +@store+ value goes out of scope so when
# it is garbage collected that native memory should be automatically freed.
def clean
if @dirty
@item_store = FFI::MemoryPointer.new @item_size, size, true
offset = 0
@pollables.each_with_index do |(pollable, entry), index|
entry.index = index
LibC.memcpy(@item_store + offset, entry.data.pointer, @item_size)
offset += @item_size
end
@dirty = false
end
end
end
end
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