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_ [Java][Ruby][マルチスレッド][デザインパターン]Java言語で学ぶデザインパターン入門マルチスレッド編 Future - 引換券を、お先にどうぞ
先に発注だけおこないあとで成果物を受け取る。
# coding: utf-8
#
# 『増補改訂版Java言語で学ぶデザインパターン入門マルチスレッド編』 http://www.hyuki.com/dp/dp2.html
#
# Future - 引換券を、お先にどうぞ
#
require 'thread'
require 'monitor'
class BData
def getContent()
end
end
class RealData < BData
def initialize(count, c)
@content = ""
puts " making RealData(#{count}, #{c}) BEGIN"
buffer = Array.new(count)
0.upto(count - 1) {|i|
buffer[i] = c
begin
sleep(0.1)
rescue => ex
puts ex
end
}
puts " making RealData(#{count}, #{c}) END"
@content = buffer.join()
end
def getContent()
return @content
end
end
class FutureData < BData
def initialize()
@lock = Monitor.new
@cond = @lock.new_cond()
@realdata = nil
@ready = false
end
def setRealData(realdata)
@lock.synchronize() {
if @ready
return # balk
end
@realdata = realdata
@ready = true
@cond.broadcast()
}
end
def getContent()
@lock.synchronize() {
while @ready == false
begin
@cond.wait()
rescue => ex
puts ex
end
end
return @realdata.getContent()
}
end
end
class Host
def initialize()
end
def request(count, c)
puts " request(#{count}, #{c}) BEGIN"
# (1) FutureDataのインスタンスを作る
future = FutureData.new()
# (2) RealDataを作るための新しいスレッドを起動する
t = Thread.new() {
realdata = RealData.new(count, c)
future.setRealData(realdata)
}
# join() するとここでブロックするのでやってはいけない
# t.join()
puts " request(#{count}, #{c}) END"
# (3) FutureDataのインスタンスを戻り値とする
return future;
end
end
def main(argv)
puts "main BEGIN"
host = Host.new()
data1 = host.request(10, 'A')
data2 = host.request(20, 'B')
data3 = host.request(30, 'C')
puts "main otherJob BEGIN"
begin
sleep(2)
rescue => ex
puts ex
end
puts "main otherJob END"
puts "data1 = #{data1.getContent()}"
puts "data2 = #{data2.getContent()}"
puts "data3 = #{data3.getContent()}"
puts "main END"
end
main(ARGV)
>ruby Future.rb
main BEGIN
request(10, A) BEGIN
request(10, A) END
request(20, B) BEGIN
request(20, B) END
request(30, C) BEGIN
request(30, C) END
main otherJob BEGIN
making RealData(10, A) BEGIN
making RealData(20, B) BEGIN
making RealData(30, C) BEGIN
making RealData(10, A) END
making RealData(20, B) END
main otherJob END
data1 = AAAAAAAAAA
data2 = BBBBBBBBBBBBBBBBBBBB
making RealData(30, C) END
data3 = CCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
main END
ライセンス
Copyright (C) 2002,2006 Hiroshi Yuki. http://www.hyuki.com/dp/dp2.html hyuki@hyuki.com This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software. Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions: 1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required. 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. 3. This notice may not be removed or altered from any source distribution.
参考
『増補改訂版Java言語で学ぶデザインパターン入門マルチスレッド編』
4797331623
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