Class: Erlang::Node

Inherits:
Object
  • Object
show all
Defined in:
lib/rinterface/node.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Node

Returns a new instance of Node.



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# File 'lib/rinterface/node.rb', line 11

def initialize
  @result = nil
end

Instance Attribute Details

#result ⇒ Object (readonly)

Returns the value of attribute result.



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# File 'lib/rinterface/node.rb', line 9

def result
  @result
end

Class Method Details

.fun(node, mod, fun, *args) ⇒ Object 



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# File 'lib/rinterface/node.rb', line 16

def fun(node, mod, fun, *args)
  rpc(node, mod, fun, args)
end

.rpc(node, mod, fun, args) ⇒ Object 



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# File 'lib/rinterface/node.rb', line 20

def rpc(node, mod, fun, args)
  n = self.new
  setup = proc{ n.do_connect(node, mod, fun, args) }

  if EM.reactor_running?
    setup.call
  else
    EM.run(&setup)
  end
  n.result
end

Instance Method Details

#do_connect(node, mod, fun, args) ⇒ Object 



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# File 'lib/rinterface/node.rb', line 34

def do_connect(node,mod,fun,args)
  epmd = EpmdConnection.lookup_node(node)
  epmd.callback do |port|
    conn = NodeConnection.rpc_call(node,port,mod,fun,args) do |c|
      c.destnode = node
      c.mod = mod
      c.fun = fun
      c.args = args
      c.port = port
      c.myname = build_nodename
      c.cookie = get_cookie
    end
    conn.callback do |r|
      # Check for bad rpc response
      # this is where I miss the patten matching in Erlang
      if r.is_a?(Array)
        if !r.empty? && r[0] == :badrpc
          @result = [:badrpc,r[1]]
        else
          @result = [:ok,r]
        end
      else
        @result = [:ok,r]
      end
      EM.stop
    end
    conn.errback do |err|
      # never called??
      @result = [:badrpc,err]
      EM.stop
    end
  end
  epmd.errback do |err|
    # return bad RPC no port found (0)
    @result = [:badrpc,"no port found for service"]
    EM.stop
  end
end