From 995ab280a4dd050acbac0d2b824bcb3178811ae6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn-Egil=20Dahlberg?= <egil@erlang.org>
Date: Tue, 23 Aug 2016 18:07:30 +0200
Subject: mnesia: Remove mnesia_frag_old_hash hash module

The module mnesia_frag_old_hash utilized the broken erlang:hash/2 function
which has been deprecated for a long time. Since erlang:hash/2 is now removed
there is no point in having this module any more.
---
 lib/mnesia/src/mnesia_frag_old_hash.erl | 133 --------------------------------
 1 file changed, 133 deletions(-)
 delete mode 100644 lib/mnesia/src/mnesia_frag_old_hash.erl

(limited to 'lib/mnesia/src/mnesia_frag_old_hash.erl')

diff --git a/lib/mnesia/src/mnesia_frag_old_hash.erl b/lib/mnesia/src/mnesia_frag_old_hash.erl
deleted file mode 100644
index b246c76236..0000000000
--- a/lib/mnesia/src/mnesia_frag_old_hash.erl
+++ /dev/null
@@ -1,133 +0,0 @@
-%%
-%% %CopyrightBegin%
-%% 
-%% Copyright Ericsson AB 2002-2016. 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.
-%% 
-%% %CopyrightEnd%
-%%
-
-%%
-%%%----------------------------------------------------------------------
-%%% Purpose : Implements hashing functionality for fragmented tables
-%%%----------------------------------------------------------------------
-
--module(mnesia_frag_old_hash).
-%%-behaviour(mnesia_frag_hash).
-
--compile({nowarn_deprecated_function, {erlang,hash,2}}).
-
-%% Hashing callback functions
--export([
-	 init_state/2,
-	 add_frag/1,
-	 del_frag/1,
-	 key_to_frag_number/2,
-	 match_spec_to_frag_numbers/2
-	]).
-
--record(old_hash_state,
-	{n_fragments,
-	 next_n_to_split,
-	 n_doubles}).
-
-%% Old style. Kept for backwards compatibility.
--record(frag_hash,
-	{foreign_key,
-	 n_fragments,
-	 next_n_to_split,
-	 n_doubles}).
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-init_state(_Tab, InitialState) when InitialState == undefined ->
-    #old_hash_state{n_fragments     = 1,
-		    next_n_to_split = 1,
-		    n_doubles       = 0};
-init_state(_Tab, FH) when is_record(FH, frag_hash) ->
-    %% Old style. Kept for backwards compatibility.
-    #old_hash_state{n_fragments     = FH#frag_hash.n_fragments,
-		    next_n_to_split = FH#frag_hash.next_n_to_split,
-		    n_doubles       = FH#frag_hash.n_doubles}.
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-add_frag(State) when is_record(State, old_hash_state) ->
-    SplitN = State#old_hash_state.next_n_to_split,
-    P = SplitN + 1,
-    L = State#old_hash_state.n_doubles,
-    NewN = State#old_hash_state.n_fragments + 1,
-    State2 = case trunc(math:pow(2, L)) + 1 of
-		 P2 when P2 == P ->
-		     State#old_hash_state{n_fragments = NewN,
-					  next_n_to_split = 1,
-					  n_doubles = L + 1};
-		 _ ->
-		     State#old_hash_state{n_fragments = NewN,
-					  next_n_to_split = P}
-	     end,
-    {State2, [SplitN], [NewN]}.
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-del_frag(State) when is_record(State, old_hash_state) ->
-    P = State#old_hash_state.next_n_to_split - 1,
-    L = State#old_hash_state.n_doubles,
-    N = State#old_hash_state.n_fragments,
-    if
-	P < 1 ->
-	    L2 = L - 1,
-	    MergeN = trunc(math:pow(2, L2)),
-	    State2 = State#old_hash_state{n_fragments = N - 1,
-					  next_n_to_split = MergeN,
-					  n_doubles = L2},
-	    {State2, [N], [MergeN]};
-	true ->
-	    MergeN = P,
-	    State2 = State#old_hash_state{n_fragments = N - 1,
-					  next_n_to_split = MergeN},
-	    {State2, [N], [MergeN]}
-	end.
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-key_to_frag_number(State, Key) when is_record(State, old_hash_state) ->
-    L = State#old_hash_state.n_doubles,
-    A = erlang:hash(Key, trunc(math:pow(2, L))),
-    P = State#old_hash_state.next_n_to_split,
-    if
-	A < P ->
-	    erlang:hash(Key, trunc(math:pow(2, L + 1)));
-	true ->
-	    A
-    end.
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-match_spec_to_frag_numbers(State, MatchSpec) when is_record(State, old_hash_state) ->
-    case MatchSpec of
-	[{HeadPat, _, _}] when is_tuple(HeadPat), tuple_size(HeadPat) > 2 ->
-	    KeyPat = element(2, HeadPat),
-	    case has_var(KeyPat) of
-		false ->
-		    [key_to_frag_number(State, KeyPat)];
-		true ->
-		    lists:seq(1, State#old_hash_state.n_fragments)
-	    end;
-	_ -> 
-	    lists:seq(1, State#old_hash_state.n_fragments)
-    end.
-
-has_var(Pat) ->
-    mnesia:has_var(Pat).
-- 
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