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Much cleaner, but not working, because I have a circular loop
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lsowen
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Dec 5, 2012
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,149 +1,125 @@ | ||
| -module(ezic_db). | ||
| -include("include/ezic.hrl"). | ||
| -include_lib("stdlib/include/qlc.hrl"). | ||
| -include_lib("eunit/include/eunit.hrl"). | ||
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| -behaviour(gen_server). | ||
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| -export([ | ||
| zones/1 | ||
| , rules/1 | ||
| , flatzone/2 | ||
| %, insert/2 | ||
| , get_all/1 | ||
| , insert_all/1 | ||
| , wipe/1 | ||
| , flatten/0 | ||
| ]). | ||
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| -export([ | ||
| wipe/0 | ||
| , wipe/1 | ||
| , init/0 | ||
| , insert_all/1 | ||
| , get_all/1 | ||
| ]). | ||
| start_link/0 | ||
| , init/1 | ||
| , code_change/3 | ||
| , handle_call/3 | ||
| , handle_cast/2 | ||
| , handle_info/2 | ||
| , terminate/2 | ||
| ]). | ||
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| -define(create(Record), | ||
| {atomic, ok} = mnesia:create_table(Record, | ||
| [{type, bag} | ||
| , {disc_copies, [node()]} | ||
| , {attributes, record_info(fields, Record)} | ||
| ])). | ||
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| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% | ||
| % READ - db reading methods | ||
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% | ||
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| % retrieve all zones by name | ||
| zones(Name) -> | ||
| F = fun()-> | ||
| Q = qlc:q([Z || Z=#zone{name=N} <- mnesia:table(zone), N=:=Name]), | ||
| qlc:e(Q) | ||
| end, | ||
| {atomic, Zones}= mnesia:transaction(F), | ||
| Zones. | ||
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| % retrieve all rules by name | ||
| rules(Name) -> | ||
| F = fun()-> | ||
| Q = qlc:q([R || R=#rule{name=N} <- mnesia:table(rule), N=:=Name]), | ||
| qlc:e(Q) | ||
| end, | ||
| {atomic, Rules}= mnesia:transaction(F), | ||
| Rules. | ||
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| % get all records from table | ||
| get_all(Tab) when is_atom(Tab) -> | ||
| F = fun() -> | ||
| Q = qlc:q([R || R<- mnesia:table(Tab)]), | ||
| qlc:e(Q) | ||
| end, | ||
| {atomic, Ret}= mnesia:transaction(F), | ||
| Ret. | ||
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| %% get a flatzone for a specific date | ||
| %% Date :: {date(), #tztime{}} | ||
| %% returns #flatzone{} | ||
| %% or throws either error: | ||
| %% * {ambiguous_zone, [Z1,Z2,...]} | ||
| %% * {no_zone} | ||
| flatzone(Date, TzName) -> | ||
| %% @todo validate Date | ||
| F = fun()-> | ||
| Q = qlc:q( | ||
| [Fz || Fz=#flatzone{tzname=N} <- mnesia:table(flatzone) | ||
| , N=:=TzName | ||
| , ezic_flatten:contains_date(Fz, Date)]), | ||
| qlc:e(Q) | ||
| end, | ||
| {atomic, FlatZones}= mnesia:transaction(F), | ||
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% | ||
| % PUBLIC API | ||
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% | ||
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| case length(FlatZones) of | ||
| 1 -> | ||
| hd(FlatZones); | ||
| 2 -> | ||
| erlang:error(ambiguous_zone, FlatZones); | ||
| 0 -> | ||
| erlang:error(no_zone); | ||
| _ -> | ||
| erlang:error(should_not_happen, {FlatZones, Date, TzName}) | ||
| end. | ||
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| zones(TzName) -> | ||
| gen_server:call(?MODULE, {zones, TzName}). | ||
|
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| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% | ||
| % ADMIN - initialization and administration methods | ||
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% | ||
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| rules(TzName) -> | ||
| gen_server:call(?MODULE, {rules, TzName}). | ||
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| % initialize the db | ||
| init() -> | ||
| create_tabs(mnesia:create_schema([node()])), | ||
| mnesia:wait_for_tables([rule, zone, link, leap, flatzone], 3000). | ||
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| flatzone(Date, TzName) -> | ||
| gen_server:call(?MODULE, {flatzone, Date, TzName}). | ||
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| % WARNING: deletes all db files | ||
| wipe() -> | ||
| mnesia:stop(), | ||
| mnesia:delete_schema([node()]). | ||
| get_all(Tab) -> | ||
| gen_server:call(?MODULE, {all, Tab}). | ||
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| insert_all(Records) -> | ||
| gen_server:call(?MODULE, {insert_all, Records}). | ||
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| %wipe() -> | ||
| % gen_server:call(?MODULE, {wipe}). | ||
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| % WARNING: deletes all entries in table Tab | ||
| wipe(Tab) -> | ||
| mnesia:transaction( | ||
| fun()-> | ||
| mnesia:delete(Tab, '_', write) | ||
| end). | ||
| gen_server:call(?MODULE, {wipe, Tab}). | ||
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| flatten() -> | ||
| gen_server:call(?MODULE, {flatten}). | ||
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| create_tabs(ok) -> | ||
| mnesia:start(), | ||
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| ?create(rule), | ||
| ?create(zone), | ||
| ?create(link), | ||
| ?create(leap), | ||
| ?create(flatzone), | ||
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% | ||
| %% GEN_SERVER | ||
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% | ||
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| ok; | ||
| create_tabs({error, {_, {already_exists,_}}}) -> | ||
| mnesia:start(), | ||
| ok; | ||
| create_tabs(E) -> | ||
| ?debugVal(E). | ||
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| start_link() -> | ||
| gen_server:start_link({local, ?MODULE}, ?MODULE, [], []). | ||
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| insert_all(Records) -> | ||
| mnesia:transaction( | ||
| fun() -> | ||
| lists:foreach( | ||
| fun(R)-> mnesia:write(R) end, | ||
| Records) | ||
| end). | ||
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| init(_) -> | ||
| ezic_db_ets:init(), | ||
| {ok, []}. | ||
|
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| %%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | ||
| %% DB Lookup | ||
| %%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | ||
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| handle_call({zones, Name}, _, State) -> | ||
| Matches= ezic_db_ets:zones(Name), | ||
| {reply, Matches, State}; | ||
| handle_call({rules, Name}, _, State) -> | ||
| Matches= ezic_db_ets:rules(Name), | ||
| {reply, Matches, State}; | ||
| handle_call({all, Tab}, _, State) -> | ||
| Matches= ezic_db_ets:get_all(Tab), | ||
| {reply, Matches, State}; | ||
| handle_call({flatzone, Date, Name}, _, State) -> | ||
| Result= ezic_db_ets:flatzone(Date, Name), | ||
| {reply, Result, State}; | ||
| handle_call({insert_all, Records}, _, State) -> | ||
| ezic_db_ets:insert_all(Records), | ||
| {noreply, State}; | ||
| handle_call({wipe, Tab}, _, State) -> | ||
| Result= ezic_db_ets:wipe(Tab), | ||
| {reply, Result, State}; | ||
| handle_call({flatten}, _, State) -> | ||
| Result= ezic_flatten:flatten(), | ||
| {reply, Result, State}; | ||
| handle_call(_, _, State) -> | ||
| {noreply, State}. | ||
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| %%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | ||
| %% Other gen_server | ||
| %%~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | ||
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| code_change(_, State, _) -> | ||
| {ok, State}. | ||
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| handle_cast(_, State) -> | ||
| {noreply, State}. | ||
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| handle_info(_, State) -> | ||
| {noreply, State}. | ||
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| terminate(_, _State) -> | ||
| ok. |
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