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KVS Key-Value Store Abstraction Layer

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kvs src stores kvs_rocks.erl
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src/stores/kvs_rocks.erl 

-module(kvs_rocks).

-include("backend.hrl").

-include("kvs.hrl").

-include("metainfo.hrl").

-include_lib("stdlib/include/qlc.hrl").

-export(?BACKEND).

-export([ref/0,next/8]).



start()    -> ok.

stop()     -> ok.

destroy()  -> ok.

version()  -> {version,"KVS ROCKSDB"}.

dir()      -> [].

leave() -> case ref() of [] -> skip; X -> rocksdb:close(X) end.

join(_) -> application:start(rocksdb),

           leave(), {ok, Ref} = rocksdb:open(application:get_env(kvs,rocks_name,"rocksdb"), [{create_if_missing, true}]),

           initialize(),

           application:set_env(kvs,rocks_ref,Ref).

initialize() -> [ kvs:initialize(kvs_rocks,Module) || Module <- kvs:modules() ].

ref() -> application:get_env(kvs,rocks_ref,[]).

index(_,_,_) -> [].

get(Tab, Key) ->

    Address = <<(list_to_binary(lists:concat(["/",io_lib:format("~p",[Tab]),"/"])))/binary,(term_to_binary(Key))/binary>>,

    case rocksdb:get(ref(), Address, []) of

         not_found -> {error,not_found};

         {ok,Bin} -> {ok,binary_to_term(Bin,[safe])} end.



put(Records) when is_list(Records) -> lists:map(fun(Record) -> put(Record) end, Records);

put(Record) -> rocksdb:put(ref(), <<(list_to_binary(lists:concat(["/",element(1,Record),"/"])))/binary,

                                    (term_to_binary(element(2,Record)))/binary>>, term_to_binary(Record), [{sync,true}]).



delete(Feed, Id) ->

    Key    = list_to_binary(lists:concat(["/",io_lib:format("~p",[Feed]),"/"])),

    A      = <<Key/binary,(term_to_binary(Id))/binary>>,

    rocksdb:delete(ref(), A, []).



count(_) -> 0.

all(R) -> {ok,I} = rocksdb:iterator(ref(), []),

           Key = list_to_binary(lists:concat(["/",io_lib:format("~p",[R])])),

           First = rocksdb:iterator_move(I, {seek,Key}),

           lists:reverse(next(I,Key,size(Key),First,[],[],-1,0)).



next(_,_,_,_,_,T,N,C) when C == N -> T;

next(I,Key,S,{ok,A,X},_,T,N,C) -> next(I,Key,S,A,X,T,N,C);

next(_,___,_,{error,_},_,T,_,_) -> T;

next(I,Key,S,A,X,T,N,C) ->

     case binary:part(A,0,S) of Key ->

          next(I,Key,S,rocksdb:iterator_move(I, next), [],

                       [binary_to_term(X,[safe])|T],N,C+1);

                  _ -> T end.



seq(_,_) -> integer_to_list(os:system_time()).

create_table(_,_) -> [].

add_table_index(_, _) -> ok.

dump() -> ok.