1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
-module(shr_timed_caches_manager).
-behavior(gen_server).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% TYPES %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% EXPORTS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%% 'gen_server' Exports
-export(
[
init/1,
handle_cast/2,
handle_call/3,
terminate/2,
code_change/3,
format_status/2,
handle_info/2
]
).
%%%% Actual Interface
-export(
[
start/0,
new_cache/3,
delete_cache/2,
get_timeout/0
]
)
.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% LOCAL FUNCTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
remove_cache (DB) ->
ets:delete(DB).
add_cache (DB, none) ->
io:format("~nTimed Caches Manager added a new cache. ~n"),
ets:new(
DB,
[
set,
public,
named_table,
{keypos, 1},
{read_concurrency, true},
{heir, none}
]
);
add_cache (DB, Heir) ->
io:format("~nTimed Caches Manager added a new cache. ~n"),
ets:new(
DB,
[
set,
public,
named_table,
{keypos, 1},
{read_concurrency, true},
{heir, Heir, DB}
]
).
inherit_cache (CacheList, DB, Heir) ->
case lists:member(DB, CacheList) of
true ->
ets:setopts(DB, {heir, Heir, DB}),
CacheList;
false ->
[DB|CacheList]
end.
remove_cache (CacheList, DB) ->
case lists:member(DB, CacheList) of
true ->
remove_cache(DB),
lists:delete(DB, CacheList);
false ->
CacheList
end.
add_cache (CacheList, DB, Heir) ->
case lists:member(DB, CacheList) of
true when (Heir =:= none) ->
CacheList;
true ->
ets:setopts(DB, {heir, Heir, DB}),
CacheList;
false ->
add_cache(DB, Heir),
[DB|CacheList]
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% EXPORTED FUNCTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%% 'gen_server' functions
init (CacheList) ->
io:format("~nStarting Timed Caches Manager..."),
{ok, CacheList}.
handle_call ({remove, CacheName}, _Caller, State) ->
{noreply, remove_cache(State, CacheName)};
handle_call ({add, CacheName, Heir}, _Caller, State)->
{noreply, add_cache(State, CacheName, Heir)};
handle_call ({inherit, CacheName, Heir}, _Caller, State)->
{noreply, inherit_cache(State, CacheName, Heir)};
handle_call (terminate, _, State) ->
{stop, normal, State}.
handle_cast ({remove, CacheName}, State) ->
{noreply, remove_cache(State, CacheName)};
handle_cast ({add, CacheName, Heir}, State)->
{noreply, add_cache(State, CacheName, Heir)};
handle_cast ({inherit, CacheName, Heir}, State)->
{noreply, inherit_cache(State, CacheName, Heir)};
handle_cast (terminate, State) ->
{stop, normal, State}.
terminate (_Reason, []) ->
ok;
terminate (Reason, [CacheName|OtherCaches]) ->
remove_cache(CacheName),
terminate(Reason, OtherCaches).
code_change (_, State, _) ->
{ok, State}.
format_status (_, [_, State]) ->
[{data, [{"State", State}]}].
handle_info(_, State) ->
{noreply, State}.
%%%% Interface Functions
start () ->
gen_server:start(?MODULE, [], []).
new_cache (ManagerPid, DB, Heir) ->
gen_server:cast(ManagerPid, {add, DB, Heir}).
delete_cache (ManagerPid, DB) ->
gen_server:cast(ManagerPid, {remove, DB}).
get_timeout () ->
120000. % 2min.
|
