| 1 |
|
-module(mod_pubsub_cache_mnesia). |
| 2 |
|
|
| 3 |
|
-behaviour(mod_pubsub_cache_backend). |
| 4 |
|
|
| 5 |
|
-include("pubsub.hrl"). |
| 6 |
|
-include("jlib.hrl"). |
| 7 |
|
|
| 8 |
|
-export([start/1, stop/0]). |
| 9 |
|
|
| 10 |
|
-export([ |
| 11 |
|
upsert_last_item/5, |
| 12 |
|
get_last_item/2, |
| 13 |
|
delete_last_item/2]). |
| 14 |
|
|
| 15 |
|
%% ------------------------ Backend start/stop ------------------------ |
| 16 |
|
|
| 17 |
|
-spec start(jid:lserver()) -> ok. |
| 18 |
|
start(_) -> |
| 19 |
:-( |
create_table(). |
| 20 |
|
|
| 21 |
|
-spec stop() -> ok. |
| 22 |
|
stop() -> |
| 23 |
:-( |
ok. |
| 24 |
|
|
| 25 |
|
-spec upsert_last_item(ServerHost :: binary(), |
| 26 |
|
Nidx :: mod_pubsub:nodeIdx(), |
| 27 |
|
ItemID :: mod_pubsub:itemId(), |
| 28 |
|
Publisher :: jid:jid(), |
| 29 |
|
Payload::mod_pubsub:payload()) -> ok | {error, Reason :: term()}. |
| 30 |
|
upsert_last_item(_ServerHost, Nidx, ItemId, Publisher, Payload) -> |
| 31 |
:-( |
CreatedAt = os:system_time(microsecond), |
| 32 |
:-( |
try mnesia:dirty_write( |
| 33 |
|
#pubsub_last_item{ |
| 34 |
|
nodeid = Nidx, |
| 35 |
|
itemid = ItemId, |
| 36 |
|
creation = {CreatedAt, {Publisher#jid.luser, Publisher#jid.lserver, <<>>}}, |
| 37 |
|
payload = Payload} |
| 38 |
|
) of |
| 39 |
:-( |
ok -> ok |
| 40 |
|
catch |
| 41 |
:-( |
exit:{aborted, Reason} -> {error, Reason} |
| 42 |
|
end. |
| 43 |
|
|
| 44 |
|
-spec get_last_item(ServerHost :: binary(), |
| 45 |
|
Nidx :: mod_pubsub:nodeIdx()) -> |
| 46 |
|
{ok, mod_pubsub:pubsubLastItem()} | {error, Reason :: term()}. |
| 47 |
|
get_last_item(_ServerHost, Nidx) -> |
| 48 |
:-( |
try mnesia:dirty_read({pubsub_last_item, Nidx}) of |
| 49 |
:-( |
[LastItem] -> {ok, LastItem}; |
| 50 |
:-( |
[] -> {error, no_items} |
| 51 |
|
catch |
| 52 |
:-( |
exit:{aborted, Reason} -> {error, Reason} |
| 53 |
|
end. |
| 54 |
|
|
| 55 |
|
-spec delete_last_item(ServerHost :: binary(), |
| 56 |
|
Nidx :: mod_pubsub:nodeIdx()) -> ok | {error, Reason :: term()}. |
| 57 |
|
delete_last_item(_ServerHost, Nidx) -> |
| 58 |
:-( |
try mnesia:dirty_delete({pubsub_last_item, Nidx}) of |
| 59 |
:-( |
ok -> ok |
| 60 |
|
catch |
| 61 |
:-( |
exit:{aborted, Reason} -> {error, Reason} |
| 62 |
|
end. |
| 63 |
|
|
| 64 |
|
%% ------------------------ Helpers ---------------------------- |
| 65 |
|
|
| 66 |
|
-spec create_table() -> ok. |
| 67 |
|
create_table() -> |
| 68 |
:-( |
mongoose_mnesia:create_table(pubsub_last_item, |
| 69 |
|
[{ram_copies, [node()]}, |
| 70 |
|
{attributes, record_info(fields, pubsub_last_item)}]), |
| 71 |
:-( |
ok. |