185 lines
5.2 KiB
C++
185 lines
5.2 KiB
C++
/*
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Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "ndb_anyvalue.h"
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/*
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AnyValue carries ServerId or Reserved codes
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Bits from opt_server_id_bits to 30 may carry other data
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so we ignore them when reading/setting AnyValue.
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The idea with supporting 'other data' is to allow NdbApi
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users to tag their NdbApi operations in some way that can
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be picked up at NdbApi event receivers, *without* interacting
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badly with / disabling normal binlogging and replication.
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To achieve this, we have a variable sized mask of bits in the
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*middle* of the AnyValue word which can be used to mask out
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the user data for the purpose of the MySQL Server.
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A better future approach would be to support > 1 tag word
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per operation.
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332 21 10 0
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10987654321098765432109876543210
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roooooooooooooooooooooooosssssss
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r = Reserved bit indicates whether
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bits 0-7+ have ServerId (0) or
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some special reserved code (1).
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o = Optional bits, depending on value
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of server-id-bits will be
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serverid bits or user-specific
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data
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s = Serverid bits or reserved codes
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At least 7 bits will be available
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for serverid or reserved codes
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Implications :
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Reserved codes can use values between
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0x80000000 and 0x8000007f inclusive
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(256 values).
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0x8000007f was always the 'nologging'
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code, so the others have started
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'counting' down from there
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Examples :
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opt_server_id_bits= 31
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- ServerIds can be up to 2^31-1
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- No user-specific data supported
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- Reserved codes look like :
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0x8000007f etc...
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opt_server_id_bits= 7
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- ServerIds can be up to 2^7-1
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- User specific data can be up to 2^24-1
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- ServerIds have 0 top bit, 24 user bits, then
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the serverid
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- Reserved codes have 1 top bit, 24 user bits (prob
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not used much), then the bottom lsbs of the
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reserved code.
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*/
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#include <my_global.h>
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extern ulong opt_server_id_mask;
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#define NDB_ANYVALUE_RESERVED_BIT 0x80000000
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#define NDB_ANYVALUE_RESERVED_MASK 0x8000007f
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#define NDB_ANYVALUE_NOLOGGING_CODE 0x8000007f
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#define NDB_ANYVALUE_REFRESH_OP_CODE 0x8000007e
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#define NDB_ANYVALUE_REFLECT_OP_CODE 0x8000007d
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#define NDB_ANYVALUE_READ_OP_CODE 0x8000007c
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/* Next reserved code : 0x8000007c */
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#ifndef DBUG_OFF
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void dbug_ndbcluster_anyvalue_set_userbits(Uint32& anyValue)
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{
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/*
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Set userData part of AnyValue (if there is one) to
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all 1s to test that it is ignored
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*/
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const Uint32 userDataMask = ~(opt_server_id_mask |
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NDB_ANYVALUE_RESERVED_BIT);
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anyValue |= userDataMask;
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}
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#endif
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bool ndbcluster_anyvalue_is_reserved(Uint32 anyValue)
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{
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return ((anyValue & NDB_ANYVALUE_RESERVED_BIT) != 0);
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}
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bool ndbcluster_anyvalue_is_nologging(Uint32 anyValue)
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{
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return ((anyValue & NDB_ANYVALUE_RESERVED_MASK) ==
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NDB_ANYVALUE_NOLOGGING_CODE);
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}
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void ndbcluster_anyvalue_set_nologging(Uint32& anyValue)
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{
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anyValue |= NDB_ANYVALUE_NOLOGGING_CODE;
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}
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bool ndbcluster_anyvalue_is_refresh_op(Uint32 anyValue)
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{
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return ((anyValue & NDB_ANYVALUE_RESERVED_MASK) ==
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NDB_ANYVALUE_REFRESH_OP_CODE);
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}
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void ndbcluster_anyvalue_set_refresh_op(Uint32& anyValue)
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{
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anyValue &= ~NDB_ANYVALUE_RESERVED_MASK;
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anyValue |= NDB_ANYVALUE_REFRESH_OP_CODE;
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}
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bool ndbcluster_anyvalue_is_read_op(Uint32 anyValue)
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{
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return ((anyValue & NDB_ANYVALUE_RESERVED_MASK) ==
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NDB_ANYVALUE_READ_OP_CODE);
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}
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void ndbcluster_anyvalue_set_read_op(Uint32& anyValue)
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{
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anyValue &= ~NDB_ANYVALUE_RESERVED_MASK;
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anyValue |= NDB_ANYVALUE_READ_OP_CODE;
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}
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bool ndbcluster_anyvalue_is_reflect_op(Uint32 anyValue)
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{
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return ((anyValue & NDB_ANYVALUE_RESERVED_MASK) ==
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NDB_ANYVALUE_REFLECT_OP_CODE);
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}
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void ndbcluster_anyvalue_set_reflect_op(Uint32& anyValue)
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{
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anyValue &= ~NDB_ANYVALUE_RESERVED_MASK;
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anyValue |= NDB_ANYVALUE_REFLECT_OP_CODE;
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}
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void ndbcluster_anyvalue_set_normal(Uint32& anyValue)
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{
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/* Clear reserved bit and serverid bits */
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anyValue &= ~(NDB_ANYVALUE_RESERVED_BIT);
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anyValue &= ~(opt_server_id_mask);
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}
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bool ndbcluster_anyvalue_is_serverid_in_range(Uint32 serverId)
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{
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return ((serverId & ~opt_server_id_mask) == 0);
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}
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Uint32 ndbcluster_anyvalue_get_serverid(Uint32 anyValue)
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{
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assert(! (anyValue & NDB_ANYVALUE_RESERVED_BIT) );
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return (anyValue & opt_server_id_mask);
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}
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void ndbcluster_anyvalue_set_serverid(Uint32& anyValue, Uint32 serverId)
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{
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assert(! (anyValue & NDB_ANYVALUE_RESERVED_BIT) );
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anyValue &= ~(opt_server_id_mask);
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anyValue |= (serverId & opt_server_id_mask);
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}
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