Fix issues with exercise 23.5

Author: Stratus3D

chapter_23/README.md

@@ -90,7 +90,7 @@ I also wrote a simple test module that can be run (make sure you are running the
 
 ```
 rebar3 shell
-1> prime_tester_server_test:run([node(), watson@localhost]).
+1> prime_tester_server_test:run().
 ok
 ```
 

chapter_23/exercise_5/src/lib_tester_db.erl

@@ -32,8 +32,10 @@ init(Nodes, Fields) ->
 
 get_state() ->
     {atomic, Result} = mnesia:transaction(fun() ->
-                               [State|_] = mnesia:read(?TABLE, mnesia:first(?TABLE)),
-                               State
+                               case mnesia:read(?TABLE, mnesia:first(?TABLE)) of
+                                   [State|_] -> State;
+                                   [] -> false
+                               end
                        end),
     Result.
 

chapter_23/exercise_5/src/prime_tester_load_balancer.erl

@@ -66,7 +66,7 @@ init({Limit, Nodes}) ->
 
     % Read Mnesia state
     State = case lib_tester_db:get_state() of
-                '$end_of_table' ->
+                false ->
                     #state{};
                 LoadedState ->
                     io:format("LoadedState: ~p", [LoadedState]),

chapter_23/exercise_5/src/prime_tester_server_test.erl

@@ -1,8 +1,8 @@
 -module(prime_tester_server_test).
 
--export([run/0]).
+-export([run/1]).
 
-run() ->
+run(Nodes) ->
     % Start the application
     ok = application:start(sellaprime),
 

chapter_23/exercise_5/src/sellaprime.app.src

@@ -8,6 +8,6 @@
              lib_tester_db]},
   %{registered,[prime_server, sellaprime_super]},
   {applications, [kernel,stdlib]},
-  {mod, {sellaprime_app,[]}},
+  {mod, {sellaprime_app,[[holmes@localhost, watson@localhost]]}},
   {start_phases, []}
  ]}.