map_client.erl

-module(map_client).
-export([get_value/2, set_value/3, get_size/1, get_keys/1, delete/2, exists/2]).

get_value(Server, Key) ->
    Server ! {self(), {get, Key}},
    receive
        {Server, {ok, Value}} ->
            Value;
        {Server, error} ->
            error
    end.

set_value(Server, Key, Value) ->
    Server ! {self(), {set, Key, Value}},
    receive
        {Server, {ok, Key, Value}} ->
            ok
    end.

get_size(Server) ->
    Server ! {self(), {size}},
    receive
        {Server, {ok, Size}} ->
            Size
    end.

get_keys(Server) ->
    Server ! {self(), {keys}},
    receive
        {Server, Keys} ->
            Keys
    end.

delete(Server, Key) ->
    Server ! {self(), {delete, Key}},
    receive
        {Server, {ok, Key}} ->
            ok
    end.    

exists(Server, Key) ->
    Server !  {self(), {exists, Key}},
    receive
        {Server, Value} ->
            Value
    end.