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release 0.8.0 - re-factored cache bucket structure. The application uses segmented cache approach vs B-tree index for TTL handling

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Dmitry Kolesnikov 2013-07-27 18:28:26 +03:00
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14 changed files with 521 additions and 184 deletions
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@ -0,0 +1,202 @@
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20
Makefile
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@ -1,5 +1,17 @@
.PHONY: deps test
ifeq ($(id),)
export id=cache
endif
FLAGS=\
-name ${id}@127.0.0.1 \
-setcookie nocookie \
-pa ./deps/*/ebin \
-pa ./examples/*/ebin \
-pa ./ebin \
+K true +A 160 -sbt ts
BB=../basho_bench
all: rebar deps compile
@ -27,15 +39,19 @@ dialyzer: compile
@dialyzer -Wno_return -c ./ebin
run:
erl -name cache@127.0.0.1 -setcookie nocookie -pa ./deps/*/ebin -pa ./ebin
erl ${FLAGS}
rebar:
curl -O http://cloud.github.com/downloads/basho/rebar/rebar
chmod ugo+x rebar
benchmark:
$(BB)/basho_bench priv/cache.benchmark
$(BB)/basho_bench -N bb@127.0.0.0 -C nocookie -J ${id}@127.0.0.1 priv/${id}.benchmark
$(BB)/priv/summary.r -i tests/current
open tests/current/summary.png
# benchmark:
# $(BB)/basho_bench -N bb@127.0.0.0 -C nocookie -J ${id}@127.0.0.1 priv/${id}.benchmark
# $(BB)/priv/summary.r -i tests/current
# open tests/current/summary.png

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README.md Normal file
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@ -0,0 +1,80 @@
# Segmented in-memory cache
Cache uses N disposable ETS tables instead of single one. The cache applies eviction and quota
policies at segment level. The oldest ETS table is destroyed and new one is created when
quota or TTL criteria are exceeded.
The write operation always uses youngest segment. The read operation lookup key from youngest to oldest table
until it is found same time key is moved to youngest segment to prolong TTL. If none of ETS table contains key
then cache-miss occurs.
The downside is inability to assign precise TTL per single cache entry. TTL is always approximated to nearest segment. (e.g. cache with 60 sec TTL and 10 segments has 6 sec accuracy on TTL)
## Usage
```erlang
application:start(cache).
{ok, _} = cache:start_link(my_cache, [{n, 10}, {ttl, 60}]).
ok = cache:put(my_cache, <<"my key">>, <<"my value">>).
Val = cache:get(my_cache, <<"my key">>).
```
### configuration via Erlang `sys.config`
The cache instances are configurable via `sys.config`. Theses cache instances are supervised by application
supervisor.
```erlang
{cache, [
{my_cache, [{n, 10}, {ttl, 60}]}
]}
```
### distributed environment
The cache application uses standard Erlang distribution model.
Please node that Erlang distribution uses single tcp/ip connection for message passing between nodes.
Therefore, frequent read/write of large entries might impact on overall Erlang performance.
The global cache instance is visible to all Erlang nodes in the cluster.
```erlang
%% at a@example.com
{ok, _} = cache:start_link({global, my_cache}, [{n, 10}, {ttl, 60}]).
Val = cache:get({global, my_cache}, <<"my key">>).
%% at b@example.com
ok = cache:put({global, my_cache}, <<"my key">>, <<"my value">>).
Val = cache:get({global, my_cache}, <<"my key">>).
```
The local cache instance is accessible for any Erlang nodes in the cluster.
```erlang
%% a@example.com
{ok, _} = cache:start_link(my_cache, [{n, 10}, {ttl, 60}]).
Val = cache:get(my_cache, <<"my key">>).
%% b@example.com
ok = cache:put({my_cache, 'a@example.com'}, <<"my key">>, <<"my value">>).
Val = cache:get({my_cache, 'a@example.com'}, <<"my key">>).
```
## Performance
MacBook Pro, Intel Core i5, 2.5GHz, 8GB 1600 MHz DDR3, 256 SSD
LRU Cache, 10 segments, 20 sec ttl (~2 sec per segment)
![Local cache (application and cache within same VM)](local.png)
![Distributed cache (application and cache runs in different VMs)](distributed.png)
## Contributors
* Jose Luis Navarro https://github.com/artefactop
* Valentin Micic

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5
priv/cache.benchmark
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@ -6,7 +6,7 @@
%%
%% workload
{mode, max}.
{duration, 1}.
{duration, 5}.
{concurrent, 10}.
{key_generator, {uniform_int, 1000000}}.
{value_generator, {fixed_bin, 1000}}.
@ -14,7 +14,6 @@
{operations, [
{put, 5}
,{get, 5}
%,{remove, 1}
]}.
%{cache, {mycache, 'cache@127.0.0.1'}}.
@ -22,6 +21,4 @@
{ttl, 20}
,{n, 10}
,{policy, lru}
%,{size, 500000}
%,{memory, 400000000}
]}.

3
src/cache.app.src
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@ -1,9 +1,10 @@
{application, cache,
[
{description, "in-memory cache"},
{vsn, "0.3.0"},
{vsn, "0.8.0"},
{modules, [
cache,
cache_bucket,
cache_sup,
cache_app
]},

122
src/cache.erl
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@ -1,32 +1,41 @@
%%
%% Copyright (c) 2012, Dmitry Kolesnikov
%% All Rights Reserved.
%% Copyright 2012 Dmitry Kolesnikov, All Rights Reserved
%%
%% This library is free software; you can redistribute it and/or modify
%% it under the terms of the GNU Lesser General Public License, version 3.0
%% as published by the Free Software Foundation (the "License").
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% You should have received a copy of the GNU Lesser General Public
%% License along with this library; if not, write to the Free Software
%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
%% USA or retrieve online http://www.opensource.org/licenses/lgpl-3.0.html
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% @description
%% segmented in-memory cache, cache memory is split into N segments,
%% each segment is associated with quota and ttl, eviction policy applied
%% at segment level.
%% segmented in-memory cache
%% * cache memory is split into N segments
%% * cache applies eviction and quota policies at segment level
%% (e.g. whole segments is destroyed at time)
%% * cache add new items to youngest segment
%% * cache lookup items from youngest to oldest segment
%%
%% @todo
%% * unit tests (improve coverage)
%% * cache read/write through handler
%% * cache atomic update (in-place update)
%% * memcached protocol
-module(cache).
-author('Dmitry Kolesnikov <dmkolesnikov@gmail.com>').
-include("cache.hrl").
-export([
start_link/2,
drop/1,
i/1,
i/2,
heap/2,
put/3,
put/4,
@ -40,45 +49,72 @@
remove_/2
]).
-export_type([cache/0]).
-type(cache() :: atom() | {atom(), atom()} | {global, atom()} | pid()).
-type(name() :: atom() | {global, atom()}).
-type(key() :: any()).
-type(entity() :: any()).
-type(ttl() :: integer()).
%%
%% start new cache
-spec(start_link/2 :: (atom(), list()) -> {ok, pid()} | {error, any()}).
%% start new cache bucket, accepted options:
%% {policy, lru | mru} - cache eviction policy
%% {memory, integer()} - cache memory quota in bytes
%% {size, integer()} - cache cardinality quota
%% {n, integer()} - number of cache segments
%% {ttl, integer()} - default time-to-live in seconds
%% {quota, integer()} - frequency of quota check in seconds
%% {stats, function() | {Mod, Fun}} - cache statistic aggregate functor
-spec(start_link/2 :: (name(), list()) -> {ok, pid()} | {error, any()}).
start_link(Cache, Opts) ->
cache_bucket:start_link(Cache, Opts).
%%
%% drop cache
-spec(drop/1 :: (atom()) -> ok).
-spec(drop/1 :: (cache()) -> ok).
drop(Cache) ->
erlang:exit(whereis(Cache), shutdown).
drop(undefined) ->
ok;
drop({global, Cache}) ->
drop(global:whereis_name(Cache));
drop({Cache, Node}) ->
drop(rpc:call(Node, cache, drop, [Cache]));
drop(Cache)
when is_atom(Cache) ->
drop(whereis(Cache));
drop(Cache)
when is_pid(Cache) ->
erlang:exit(Cache, shutdown).
%%
%% return cache meta data
-spec(i/1 :: (atom()) -> list()).
%% {heap, [integer()]} - cache segments references
%% {expire, [integer()]} - cache segments expire times
%% {size, [integer()]} - cardinality of cache segments
%% {memory, [integer()]} - memory occupied by each cache segment
-spec(i/1 :: (cache()) -> list()).
-spec(i/2 :: (cache(), atom()) -> list()).
i(Cache) ->
gen_server:call(Cache, i).
i(Cache, Name) ->
proplists:get_value(Name, i(Cache)).
%%
%% return nth cache heap
-spec(heap/2 :: (atom(), integer()) -> integer() | badarg).
%% return nth cache segment (e.g. heap(..., 1) returns youngest segment)
-spec(heap/2 :: (cache(), integer()) -> integer() | badarg).
heap(Cache, N) ->
gen_server:call(Cache, {heap, N}).
%%
%% put entity to cache
-spec(put/3 :: (atom(), key(), entity()) -> ok).
-spec(put_/3 :: (atom(), key(), entity()) -> ok).
-spec(put/4 :: (atom(), key(), entity(), ttl()) -> ok).
-spec(put_/4 :: (atom(), key(), entity(), ttl()) -> ok).
%% synchronous cache put
-spec(put/3 :: (cache(), key(), entity()) -> ok).
-spec(put/4 :: (cache(), key(), entity(), ttl()) -> ok).
put(Cache, Key, Val) ->
gen_server:call(Cache, {put, Key, Val}, ?DEF_CACHE_TIMEOUT).
@ -86,6 +122,11 @@ put(Cache, Key, Val) ->
put(Cache, Key, Val, TTL) ->
gen_server:call(Cache, {put, Key, Val, TTL}, ?DEF_CACHE_TIMEOUT).
%%
%% asynchronous cache put
-spec(put_/3 :: (cache(), key(), entity()) -> ok).
-spec(put_/4 :: (cache(), key(), entity(), ttl()) -> ok).
put_(Cache, Key, Val) ->
gen_server:cast(Cache, {put, Key, Val}).
@ -93,41 +134,44 @@ put_(Cache, Key, Val, TTL) ->
gen_server:cast(Cache, {put, Key, Val, TTL}).
%%
%% get entity from cache, prolong ttl
-spec(get/2 :: (atom(), key()) -> entity() | undefined).
%% synchronous get cache entry, the operation prolongs entry ttl
-spec(get/2 :: (cache(), key()) -> entity() | undefined).
get(Cache, Key) ->
gen_server:call(Cache, {get, Key}, ?DEF_CACHE_TIMEOUT).
%%
%% lookup entity at cache do not prolong ttl
-spec(lookup/2 :: (atom(), key()) -> entity() | undefined).
%% synchronous lookup cache entry, the operation do not prolong entry ttl
-spec(lookup/2 :: (cache(), key()) -> entity() | undefined).
lookup(Cache, Key) ->
gen_server:call(Cache, {lookup, Key}, ?DEF_CACHE_TIMEOUT).
%%
%% check entity at cache
-spec(has/2 :: (atom(), key()) -> true | false).
%% check if cache key exists,
-spec(has/2 :: (cache(), key()) -> true | false).
has(Cache, Key) ->
gen_server:call(Cache, {has, Key}, ?DEF_CACHE_TIMEOUT).
%%
%% check entity at cache and return estimated ttl
-spec(ttl/2 :: (atom(), key()) -> ttl() | false).
-spec(ttl/2 :: (cache(), key()) -> ttl() | false).
ttl(Cache, Key) ->
gen_server:call(Cache, {ttl, Key}, ?DEF_CACHE_TIMEOUT).
%%
%% remove entity from cache
-spec(remove/2 :: (atom(), key()) -> ok).
-spec(remove_/2 :: (atom(), key()) -> ok).
%% synchronous remove entry from cache
-spec(remove/2 :: (cache(), key()) -> ok).
remove(Cache, Key) ->
gen_server:call(Cache, {remove, Key}, ?DEF_CACHE_TIMEOUT).
%%
%% asynchronous remove entry from cache
-spec(remove_/2 :: (cache(), key()) -> ok).
remove_(Cache, Key) ->
gen_server:cast(Cache, {remove, Key}).

16
src/cache.hrl
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@ -1,4 +1,18 @@
%%
%% Copyright 2012 Dmitry Kolesnikov, All Rights Reserved
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%-define(VERBOSE, true).
-ifdef(VERBOSE).

24
src/cache_app.erl
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@ -1,22 +1,20 @@
%%
%% Copyright (c) 2012, Dmitry Kolesnikov
%% All Rights Reserved.
%% Copyright 2012 Dmitry Kolesnikov, All Rights Reserved
%%
%% This library is free software; you can redistribute it and/or modify
%% it under the terms of the GNU Lesser General Public License, version 3.0
%% as published by the Free Software Foundation (the "License").
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% You should have received a copy of the GNU Lesser General Public
%% License along with this library; if not, write to the Free Software
%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
%% USA or retrieve online http://www.opensource.org/licenses/lgpl-3.0.html
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% @description
%% cache application
-module(cache_app).
-behaviour(application).
-author('Dmitry Kolesnikov <dmkolesnikov@gmail.com>').

35
src/cache_benchmark.erl
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@ -1,28 +1,24 @@
%%
%% Copyright (c) 2012, Dmitry Kolesnikov
%% All Rights Reserved.
%% Copyright 2012 Dmitry Kolesnikov, All Rights Reserved
%%
%% This library is free software; you can redistribute it and/or modify
%% it under the terms of the GNU Lesser General Public License, version 3.0
%% as published by the Free Software Foundation (the "License").
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% You should have received a copy of the GNU Lesser General Public
%% License along with this library; if not, write to the Free Software
%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
%% USA or retrieve online http://www.opensource.org/licenses/lgpl-3.0.html
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% @description
%% basho_bench driver
%% cache basho_bench driver
-module(cache_benchmark).
-author('Dmitry Kolesnikov <dmkolesnikov@gmail.com>').
-export([
new/1, run/4
]).
-export([new/1, run/4]).
%%
%%
@ -76,7 +72,6 @@ local_init() ->
%%
%%
failure(Tag, _Key, E) ->
%io:format("----> ~p~n", [process_info(pns:whereis(kv, Key))]),
io:format("~s -> ~p~n", [Tag, E]),
failure(_Tag, _Key, _E) ->
%io:format("~s -> ~p~n", [Tag, E]),
failed.

109
src/cache_bucket.erl
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@ -1,52 +1,55 @@
%%
%% Copyright (c) 2012, Dmitry Kolesnikov
%% All Rights Reserved.
%% Copyright 2012 Dmitry Kolesnikov, All Rights Reserved
%%
%% This library is free software; you can redistribute it and/or modify
%% it under the terms of the GNU Lesser General Public License, version 3.0
%% as published by the Free Software Foundation (the "License").
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% You should have received a copy of the GNU Lesser General Public
%% License along with this library; if not, write to the Free Software
%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
%% USA or retrieve online http://www.opensource.org/licenses/lgpl-3.0.html
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% @description
%%
%% cache bucket process
-module(cache_bucket).
-behaviour(gen_server).
-author('Dmitry Kolesnikov <dmkolesnikov@gmail.com>').
-include("cache.hrl").
-export([
start_link/2,
init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, code_change/3
init/1,
terminate/2,
handle_call/3,
handle_cast/2,
handle_info/2,
code_change/3
]).
%%
%%
%% internal bucket state
-record(cache, {
name :: atom(), %% name of cache bucket
name = undefined :: atom(), %% name of cache bucket
heap = [] :: list(), %% cache heap segments
n = ?DEF_CACHE_N :: integer(), %% number of segments
ttl = ?DEF_CACHE_TTL :: integer(), %% chunk time to live
ttl = ?DEF_CACHE_TTL :: integer(), %% cache time to live
policy = ?DEF_CACHE_POLICY :: integer(), %% eviction policy
cardinality :: integer(), %% cache cardinality
memory :: integer(), %% cache memory limit
cardinality = undefined :: integer(), %% cache cardinality
memory = undefined :: integer(), %% cache memory limit
quota = ?DEF_CACHE_QUOTA :: integer(), %% quota enforcement timer
evict = undefined, %% evict timer
stats :: any() %% stats functor
stats = undefined :: any() %% stats aggregation functor
}).
%% cache segment
-record(heap, {
id :: integer(), %% segment heap
expire :: integer(), %% segment expire time
@ -54,8 +57,12 @@
memory :: integer() %% segment memory quota
}).
%%
%%
%%%----------------------------------------------------------------------------
%%%
%%% Factory
%%%
%%%----------------------------------------------------------------------------
start_link({global, Name}, Opts) ->
gen_server:start_link({global, Name}, ?MODULE, [Name, Opts], []);
@ -90,7 +97,7 @@ init([_ | Opts], S) ->
init(Opts, S);
init([], S) ->
random:seed(erlang:now()),
random:seed(os:timestamp()),
Evict = cache_util:mdiv(S#cache.ttl, S#cache.n),
init_heap(
S#cache{
@ -102,7 +109,6 @@ init([], S) ->
%%
%%
terminate(_Reason, _S) ->
%cache_heap:free(S#cache.heap),
ok.
%%%----------------------------------------------------------------------------
@ -164,6 +170,8 @@ handle_cast({remove, Key}, S) ->
handle_cast(_, S) ->
{noreply, S}.
%%
%%
handle_info(evict, S) ->
Now = cache_util:now(),
case lists:last(S#cache.heap) of
@ -188,13 +196,13 @@ handle_info(quota, S) ->
N when N =:= S#cache.n ->
{noreply,
free_heap(
S#cache{quota = cache_util:timeout(S#cache.evict, quota)}
S#cache{quota = cache_util:timeout(S#cache.quota, quota)}
)
};
_ ->
{noreply,
init_heap(
S#cache{quota = cache_util:timeout(S#cache.evict, quota)}
S#cache{quota = cache_util:timeout(S#cache.quota, quota)}
)
}
end;
@ -234,8 +242,8 @@ cache_put(Key, Val, #cache{}=S) ->
?DEBUG("cache ~p: put ~p to heap ~p~n", [S#cache.name, Key, Head#heap.id]),
S.
cache_put(Key, Val, Time, #cache{}=S) ->
case lists:splitwith(fun(X) -> X#heap.expire > Time end, S#cache.heap) of
cache_put(Key, Val, Expire, #cache{}=S) ->
case lists:splitwith(fun(X) -> X#heap.expire > Expire end, S#cache.heap) of
{[], _Tail} ->
cache_put(Key, Val, S);
{Head, Tail} ->
@ -250,18 +258,13 @@ cache_put(Key, Val, Time, #cache{}=S) ->
S
end.
%%
%% get cache value
cache_get(Key, #cache{policy=mru}=S) ->
% cache MRU should not move key anywhere because
% cache always evicts last generation
% MRU caches do not prolong recently used entity
case heap_lookup(Key, S#cache.heap) of
undefined ->
cache_util:stats(S#cache.stats, {cache, S#cache.name, miss}),
undefined;
{_Heap, Val} ->
?DEBUG("cache ~p: get ~p at cell ~p~n", [S#cache.name, Key, Heap#heap.id]),
cache_util:stats(S#cache.stats, {cache, S#cache.name, hit}),
Val
end;
% fall-back to cache lookup
cache_lookup(Key, S);
cache_get(Key, #cache{}=S) ->
Head = hd(S#cache.heap),
@ -281,6 +284,8 @@ cache_get(Key, #cache{}=S) ->
Val
end.
%%
%% lookup cache value
cache_lookup(Key, #cache{}=S) ->
case heap_lookup(Key, S#cache.heap) of
undefined ->
@ -292,6 +297,8 @@ cache_lookup(Key, #cache{}=S) ->
Val
end.
%%
%% check if key exists
cache_has(Key, #cache{}=S) ->
case heap_has(Key, S#cache.heap) of
false ->
@ -301,6 +308,8 @@ cache_has(Key, #cache{}=S) ->
true
end.
%%
%% check key ttl
cache_ttl(Key, #cache{}=S) ->
case heap_has(Key, S#cache.heap) of
false ->
@ -309,6 +318,8 @@ cache_ttl(Key, #cache{}=S) ->
Heap#heap.expire - cache_util:now()
end.
%%
%%
cache_remove(Key, #cache{}=S) ->
lists:foreach(
fun(X) -> ets:delete(X#heap.id, Key) end,
@ -341,22 +352,6 @@ heap_has(_Key, []) ->
false.
% %%
% %%
% remove(Key, S) ->
% Cell = evict_key(Key, cache_heap:cells(S#cache.heap)),
% ?DEBUG("cache ~p: remove ~p in cell ~p~n", [S#cache.name, Key, Cell]),
% S.
% %%
% %%
% member(Key, S) ->
% dowhile(
% fun(X) -> ets:member(X, Key) end,
% cache_heap:cells(S#cache.heap)
% ).
%%
%% init cache heap
init_heap(#cache{}=S) ->
@ -387,7 +382,7 @@ free_heap(#cache{}=S) ->
).
%%
%%
%% heap policy check
is_heap_out_of_quota(#heap{}=H) ->
is_out_of_memory(H) orelse is_out_of_capacity(H).

24
src/cache_sup.erl
View File

@ -1,25 +1,23 @@
%%
%% Copyright (c) 2012, Dmitry Kolesnikov
%% All Rights Reserved.
%% Copyright 2012 Dmitry Kolesnikov, All Rights Reserved
%%
%% This library is free software; you can redistribute it and/or modify
%% it under the terms of the GNU Lesser General Public License, version 3.0
%% as published by the Free Software Foundation (the "License").
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% You should have received a copy of the GNU Lesser General Public
%% License along with this library; if not, write to the Free Software
%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
%% USA or retrieve online http://www.opensource.org/licenses/lgpl-3.0.html
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% @description
%% root cache supervisor
-module(cache_sup).
-behaviour(supervisor).
-author('Dmitry Kolesnikov <dmkolesnikov@gmail.com>').
-export([start_link/0, init/1]).

47
src/cache_util.erl
View File

@ -1,23 +1,20 @@
%%
%% Copyright (c) 2012, Dmitry Kolesnikov
%% All Rights Reserved.
%% Copyright 2012 Dmitry Kolesnikov, All Rights Reserved
%%
%% This library is free software; you can redistribute it and/or modify
%% it under the terms of the GNU Lesser General Public License, version 3.0
%% as published by the Free Software Foundation (the "License").
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% You should have received a copy of the GNU Lesser General Public
%% License along with this library; if not, write to the Free Software
%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
%% USA or retrieve online http://www.opensource.org/licenses/lgpl-3.0.html
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% @description
%%
%% cache utility
-module(cache_util).
-export([
@ -25,31 +22,33 @@
]).
%%
%%
mdiv(undefined, _) ->
%% maybe div
mdiv(X, Y)
when X =:= undefined orelse Y =:= undefined ->
undefined;
mdiv(X, Y) ->
X div Y.
%%
%%
madd(undefined, _) ->
%% maybe add
madd(X, Y)
when X =:= undefined orelse Y =:= undefined ->
undefined;
madd(X, Y) ->
X + Y.
%%
%%
mmul(undefined, _) ->
%% maybe multiply
mmul(X, Y)
when X =:= undefined orelse Y =:= undefined ->
undefined;
mmul(X, Y) ->
X * Y.
%%
%%
now() ->
{Mega, Sec, _} = erlang:now(),
{Mega, Sec, _} = os:timestamp(),
Mega * 1000000 + Sec.
%%
@ -71,9 +70,7 @@ stats(Fun, Counter, Val)
Fun(Counter, Val).
%%
%%
%%
%% re-set alarm after time
%% set / reset timeout
timeout(T, Msg)
when is_integer(T) ->
{clock, T, erlang:send_after(T, self(), Msg)};