Class: Nobject::Local

Inherits:
Object
  • Object
show all
Defined in:
lib/nobject/local.rb

Overview

this class is used by the client application, wraps a local object, pushes it to a Nobject::Serve4r, which will then send method calls to a matching Nobject::Remote object

Defined Under Namespace

Classes: InvalidMethod, MethodRequestFailure, MethodResponseFailure, UnknownReturnDataType

Instance Method Summary collapse

Constructor Details

#initialize(host, port, obj) ⇒ Local

host: the hostname of the server to push obj to port: the port number of the server to push obj to obj: the obj to store over the network

ex:

# this will create a new Nobject::Local, then push it to the specified
server Nobject::Local.new('localhost', 1234, <object>)



15
16
17
18
19
20
21
22
23
24
 
# File 'lib/nobject/local.rb', line 15

def initialize(host, port, obj)
  @msg_counter = 0
  @socket = TCPSocket.new(host, port)
  obj_bytes = Marshal.dump(obj)

  File.open('/tmp/nobject.log', 'a') {|f| f.puts "L:##{@msg_counter += 1} sz#{obj_bytes.length}"; f.flush }
  @socket.send([obj_bytes.length].pack('Q>'), 0)
  @socket.send(obj_bytes, 0)
  @socket.flush
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args, **kwargs, &block) ⇒ Object 



26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
 
# File 'lib/nobject/local.rb', line 26

def method_missing(method, *args, **kwargs, &block)
  msg = { method: method, args: args }
  msg_bytes = Marshal.dump(msg)

  begin
    @socket.send([msg_bytes.length].pack('Q>'), 0)
    File.open('/tmp/nobject.log', 'a') {|f| f.puts "  LMS:##{@msg_counter += 1} sz#{msg_bytes.length} m:#{method}"; f.flush }
    @socket.send(msg_bytes, 0)
    @socket.flush
  rescue Exception
    raise Local::MethodRequestFailure.new("did not receive response from call to `#{method}' over the network")
  end

  return_data = begin
                  msg_size = @socket.recv(8).unpack('Q>').first
                  raw_bytes = @socket.recv(msg_size)
                  File.open('/tmp/nobject.log', 'a') {|f| f.puts "    LMGotit :##{@msg_counter += 1} sz#{msg_size} bytes:#{raw_bytes.length} m:#{method}"; f.flush }
                  Marshal.load(raw_bytes)
                rescue Exception => e
                  error_msg = <<~MSG
                    did not receive response from call to `#{method}' over the network
                    would have been msg_id #{@msg_counter} OR #{@msg_counter + 1} when trying to receive #{msg_size} bytes
                    caused by #{e.class.name}
                      exception backtrace:
                      #{e.backtrace.join("\n    ")}
                  MSG
                  raise Local::MethodResponseFailure.new(error_msg)
                end

  case return_data.first
  when :ok then return_data.last
  when :raise then raise return_data.last
  else
    raise Local::UnknownReturnDataType.new("unknown data type '#{return_data.first}' within Nobject::Local (Nobject::Local::UnknownReturnDataType)")
  end
end

Instance Method Details

#!~(other) ⇒ Object

method overridden from Object class



66
 
# File 'lib/nobject/local.rb', line 66

def !~(other);      method_missing(:is_a?, other);  end

#<=>(other) ⇒ Object 



67
 
# File 'lib/nobject/local.rb', line 67

def <=>(other);     method_missing(:<=>, other);    end

#===(other) ⇒ Object 



68
 
# File 'lib/nobject/local.rb', line 68

def ===(other);     method_missing(:<=>, other);    end

#inspect ⇒ Object 



70
 
# File 'lib/nobject/local.rb', line 70

def inspect;        method_missing(:inspect);       end

#is_a?(klass) ⇒ Boolean

Returns:

  • (Boolean) 


69
 
# File 'lib/nobject/local.rb', line 69

def is_a?(klass);   method_missing(:is_a?, klass);  end

#to_s ⇒ Object 



71
 
# File 'lib/nobject/local.rb', line 71

def to_s;           method_missing(:to_s);          end