faa0dea2ce
A class capble of detecting statements that change the transaction state and autocommit mode. The detection is done using regexes. There is still some expanding and optimization to be done.
88 lines
2.4 KiB
C++
88 lines
2.4 KiB
C++
#pragma once
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/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
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*
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* Change Date: 2019-07-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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#include <maxscale/cppdefs.hh>
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#include <maxscale/pcre2.h>
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#include <maxscale/query_classifier.h>
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namespace maxscale
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{
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/**
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* @class TrxBoundaryMatcher
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*
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* @ TrxBoundaryMatcher is a class capable of, using regexes, to recognize
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* and return the correct type mask of statements affecting the transaction
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* state and* autocommit mode.
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*/
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class TrxBoundaryMatcher
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{
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public:
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/**
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* To be called once at process startup. After a successful call,
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* @type_mask_of() can be used in the calling thread.
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*
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* @return True, if the initialization succeeded, false otherwise.
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*/
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static bool process_init();
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/**
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* To be called once at process shut down.
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*/
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static void process_end();
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/**
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* To be called once in each thread, other that the one where @process_init()
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* was called. After a successful call, @type_mask_of() can be used in the
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* calling thread.
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*
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* @return True, if the initialization succeeded, false otherwise.
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*/
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static bool thread_init();
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/**
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* To be called once at thread shut down.
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*/
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static void thread_end();
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/**
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* Return the type mask of a statement, provided the statement affects
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* transaction state or autocommit mode.
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*
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* @param pSql Sql statement.
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* @param len Length of @c pSql.
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*
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* @return The corresponding type mask or 0, if the statement does not
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* affect transaction state or autocommit mode.
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*/
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static uint32_t type_mask_of(const char* pSql, size_t len);
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/**
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* Return the type mask of a statement, provided the statement affects
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* transaction state or autocommit mode.
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*
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* @param pBuf A COM_QUERY
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*
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* @return The corresponding type mask or 0, if the statement does not
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* affect transaction state or autocommit mode.
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*/
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static uint32_t type_mask_of(GWBUF* pBuf);
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private:
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TrxBoundaryMatcher(const TrxBoundaryMatcher&);
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TrxBoundaryMatcher& operator = (const TrxBoundaryMatcher&);
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};
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}
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