Class: RedisRPC::Client

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

Instance Method Summary collapse

Constructor Details

#initialize(redis_server, message_queue, timeout = 0) ⇒ Client

Returns a new instance of Client.



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# File 'lib/redisrpc.rb', line 52

def initialize(redis_server, message_queue, timeout=0)
    @redis_server = redis_server
    @message_queue = message_queue
    @timeout = timeout
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

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



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# File 'lib/redisrpc.rb', line 58

def method_missing(sym, *args, &block)
    function_call = {'name' => sym.to_s, 'args' => args}
    response_queue = @message_queue + ':rpc:' + rand_string
    rpc_request = {'function_call' => function_call, 'response_queue' => response_queue}
    message = JSON.generate rpc_request
    if $DEBUG
        $stderr.puts 'RPC Request: ' + message
    end
    @redis_server.rpush @message_queue, message
    result = @redis_server.blpop response_queue, @timeout
    if result.nil?
        raise TimeoutException
    end
    message_queue, message = result
    if $DEBUG
        if message_queue != response_queue
            fail 'assertion failed'
        end
        $stderr.puts 'RPC Response: ' + message
    end
    rpc_response = JSON.parse message
    exception = rpc_response['exception']
    if exception != nil
        raise RemoteException, exception
    end
    if not rpc_response.has_key? 'return_value'
        raise RemoteException, 'Malformed RPC Response message: ' + rpc_response
    end
    return rpc_response['return_value']
end

Instance Method Details

#rand_string(size = 8, charset = %w{ 1 2 3 4 5 6 7 8 9 0 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z}) ⇒ Object 



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# File 'lib/redisrpc.rb', line 89

def rand_string(size=8, charset=%w{ 1 2 3 4 5 6 7 8 9 0 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z})
    return (0...size).map{ charset.to_a[rand(charset.size)] }.join
end

#respond_to?(sym) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/redisrpc.rb', line 93

def respond_to?(sym)
    return true
end