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%% ----------------------------------------------------------------------------
%%
%% hanoidb: LSM-trees (Log-Structured Merge Trees) Indexed Storage
%%
%% Copyright 2011-2012 (c) Trifork A/S. All Rights Reserved.
%% http://trifork.com/ info@trifork.com
%%
%% Copyright 2012 (c) Basho Technologies, Inc. All Rights Reserved.
%% http://basho.com/ info@basho.com
%%
%% This file is provided to you 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.
%%
%% ----------------------------------------------------------------------------
%% smallest levels are 256 entries
-define(TOP_LEVEL, 8).
-define(BTREE_SIZE(Level), (1 bsl (Level))).
-define(FILE_FORMAT, <<"HAN2">>).
-define(FIRST_BLOCK_POS, byte_size(?FILE_FORMAT)).
-define(TOMBSTONE, 'deleted').
-define(KEY_IN_FROM_RANGE(Key,Range),
((Range#key_range.from_inclusive andalso
(Range#key_range.from_key =< Key))
orelse
(Range#key_range.from_key < Key))).
-define(KEY_IN_TO_RANGE(Key,Range),
((Range#key_range.to_key == undefined)
orelse
((Range#key_range.to_inclusive andalso
(Key =< Range#key_range.to_key))
orelse
(Key < Range#key_range.to_key)))).
-define(KEY_IN_RANGE(Key,Range),
(?KEY_IN_FROM_RANGE(Key,Range) andalso ?KEY_IN_TO_RANGE(Key,Range))).
-record(nursery, { log_file :: file:fd(),
dir :: string(),
cache :: gb_tree(),
total_size=0 :: integer(),
count=0 :: integer(),
last_sync=now() :: erlang:timestamp(),
max_level :: integer(),
config=[] :: [{atom(), term()}],
step=0 :: integer(),
merge_done=0 :: integer(),
backend = hanoidb_han2_backend :: atom()
}).
-type kventry() :: { key(), expvalue() } | [ kventry() ].
-type key() :: binary().
-type txspec() :: { delete, key() } | { put, key(), value() }.
-type value() :: ?TOMBSTONE | binary().
-type expiry() :: infinity | integer().
-type filepos() :: { non_neg_integer(), non_neg_integer() }.
-type expvalue() :: { value(), expiry() }
| value()
| filepos().
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