SOAP及Web Services

我們可以通過SOAP伺服器來通路預先定義好的對象，通過soap/rpc/driver就可做到，這也可以看作是同其他語言互動的一種很好的方式，伺服器端存為server.rb

require 'soap/rpc/standaloneServer'

class InterestCalculator

  attr_reader :call_count

  def initialize

    @call_count=0

  end

  def compound(printcipal,rate,freq,years)

    @call_count+=1

    printcipal*(1.0+rate/freq)**(freq*years)

end

NS='http://pragprog.com/InterestCalc'

class Server2<SOAP::RPC::StandaloneServer

  def on_init

    calc=InterestCalculator.new

    add_method(calc,'compound','printcipal','rate','freq','years')

    add_method(calc,'call_count')

svr=Server2.new('Calc',NS,'0.0.0.0',12321)

trap('INT'){svr.shutdown}

svr.start

用戶端代碼存為client.rb

require 'soap/rpc/driver'

proxy=SOAP::RPC::Driver.new("http://localhost:12321","http://pragprog.com/InterestCalc")

proxy.add_method('compound','principle','rate','freq','years')

proxy.add_method('call_count')

puts "Call count: #{proxy.call_count}"

puts "5 years,compound annually: #{proxy.compound(100,0.06,1,5)}"

puts "5 years,compound monthly: #{proxy.compound(100,0.06,12,5)}"

我們在伺服器端輸入

% ruby server.rb

以打開伺服器

用戶端中輸入

%ruby client.rb

會顯示

Call count:0

5 years,compound annually:133.8225776

.......