Class: Cuboid::RPC::Client::Instance

Inherits:
Object
  • Object
show all
Defined in:
lib/cuboid/rpc/client/instance.rb,
lib/cuboid/rpc/client/instance/service.rb

Overview

RPC client for remote instances spawned by a remote agent

Author:

  • Tasos “Zapotek” Laskos <tasos.laskos@gmail.com>

Defined Under Namespace

Classes: Proxy

Constant Summary collapse

RETRIES = 
5

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(url, token = nil, options = nil) ⇒ Instance

Returns a new instance of Instance.



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# File 'lib/cuboid/rpc/client/instance.rb', line 56

def initialize( url, token = nil, options = nil )
    @token    = token
    @client   = Base.new( url, token, options )

    @instance = Proxy.new( @client )
    @options  = Toq::Proxy.new( @client, 'options' )

    # map Agent handlers
    Cuboid::Application.application.instance_services.keys.each do |name|
        self.class.send( :attr_reader, name.to_sym )

        instance_variable_set(
          "@#{name}".to_sym,
          Toq::Proxy.new( @client, name )
        )
    end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(sym, *args, &block) ⇒ Object (private)

Used to provide the illusion of locality for remote methods



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# File 'lib/cuboid/rpc/client/instance.rb', line 105

def method_missing( sym, *args, &block )
    @instance.send( sym, *args, &block )
end

Instance Attribute Details

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/cuboid/rpc/client/instance.rb', line 14

def options
  @options
end

#pid ⇒ Object

Not always available, set by the parent.



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# File 'lib/cuboid/rpc/client/instance.rb', line 13

def pid
  @pid
end

Class Method Details

.when_ready(url, token, &block) ⇒ Object 



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# File 'lib/cuboid/rpc/client/instance.rb', line 22

def when_ready( url, token, &block )
    options = Cuboid::Options.rpc.to_client_options.merge(
        client_max_retries:   0,
        connection_pool_size: 1
    )

    raktr = Raktr.new
    raktr.run_in_thread

    client = new( url, token, options )
    tries = 0
    raktr.delay( 0.1 ) do |task|
        client.alive? do |r|
            if r.rpc_exception?
                if tries >= RETRIES
                    client.close
                    block.call
                    next
                end

                raktr.delay( 0.1, &task )
                tries += 1
                next
            end

            client.close

            block.call
        end
    end
end

Instance Method Details

#address ⇒ Object 



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# File 'lib/cuboid/rpc/client/instance.rb', line 94

def address
    @client.address
end

#client ⇒ Object 



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# File 'lib/cuboid/rpc/client/instance.rb', line 82

def client
    @client
end

#close ⇒ Object 



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# File 'lib/cuboid/rpc/client/instance.rb', line 86

def close
    @client.close
end

#port ⇒ Object 



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# File 'lib/cuboid/rpc/client/instance.rb', line 98

def port
    @client.port
end

#token ⇒ Object 



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# File 'lib/cuboid/rpc/client/instance.rb', line 78

def token
    @token
end

#url ⇒ Object 



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# File 'lib/cuboid/rpc/client/instance.rb', line 90

def url
    @client.url
end

#when_ready(&block) ⇒ Object 



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# File 'lib/cuboid/rpc/client/instance.rb', line 74

def when_ready( &block )
    self.class.when_ready( url, token, &block )
end