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138 lines
4.2 KiB
138 lines
4.2 KiB
/* Copyright (c) 2015, 2019, 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, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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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, version 2.0, 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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#ifndef SQL_PLUGIN_REF_INCLUDED
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#define SQL_PLUGIN_REF_INCLUDED
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#include "lex_string.h"
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#include "my_alloc.h"
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#include "mysql/mysql_lex_string.h"
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#include "prealloced_array.h"
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class sys_var;
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struct st_mysql_plugin;
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struct st_plugin_dl;
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enum enum_plugin_load_option {
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PLUGIN_OFF,
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PLUGIN_ON,
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PLUGIN_FORCE,
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PLUGIN_FORCE_PLUS_PERMANENT
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};
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/* A handle of a plugin */
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struct st_plugin_int {
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LEX_CSTRING name{nullptr, 0};
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st_mysql_plugin *plugin{nullptr};
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st_plugin_dl *plugin_dl{nullptr};
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uint state{0};
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uint ref_count{0}; /* number of threads using the plugin */
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void *data{nullptr}; /* plugin type specific, e.g. handlerton */
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MEM_ROOT mem_root; /* memory for dynamic plugin structures */
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sys_var *system_vars{nullptr}; /* server variables for this plugin */
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enum_plugin_load_option load_option{
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PLUGIN_OFF}; /* OFF, ON, FORCE, F+PERMANENT */
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};
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/*
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See intern_plugin_lock() for the explanation for the
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conditionally defined plugin_ref type
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*/
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#ifdef DBUG_OFF
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typedef struct st_plugin_int *plugin_ref;
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inline st_mysql_plugin *plugin_decl(st_plugin_int *ref) { return ref->plugin; }
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inline st_plugin_dl *plugin_dlib(st_plugin_int *ref) { return ref->plugin_dl; }
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template <typename T>
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inline T plugin_data(st_plugin_int *ref) {
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return static_cast<T>(ref->data);
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}
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inline LEX_CSTRING *plugin_name(st_plugin_int *ref) { return &(ref->name); }
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inline uint plugin_state(st_plugin_int *ref) { return ref->state; }
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inline enum_plugin_load_option plugin_load_option(st_plugin_int *ref) {
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return ref->load_option;
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}
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inline bool plugin_equals(st_plugin_int *ref1, st_plugin_int *ref2) {
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return ref1 == ref2;
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}
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#else
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typedef struct st_plugin_int **plugin_ref;
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inline st_mysql_plugin *plugin_decl(st_plugin_int **ref) {
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return ref[0]->plugin;
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}
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inline st_plugin_dl *plugin_dlib(st_plugin_int **ref) {
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return ref[0]->plugin_dl;
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}
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template <typename T>
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inline T plugin_data(st_plugin_int **ref) {
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return static_cast<T>(ref[0]->data);
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}
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inline LEX_CSTRING *plugin_name(st_plugin_int **ref) { return &(ref[0]->name); }
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inline uint plugin_state(st_plugin_int **ref) { return ref[0]->state; }
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inline enum_plugin_load_option plugin_load_option(st_plugin_int **ref) {
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return ref[0]->load_option;
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}
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inline bool plugin_equals(st_plugin_int **ref1, st_plugin_int **ref2) {
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return ref1 && ref2 && (ref1[0] == ref2[0]);
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}
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#endif
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/**
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@class Plugin_array
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@brief Plugin array helper class.
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*/
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class Plugin_array : public Prealloced_array<plugin_ref, 2> {
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public:
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/**
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Class construction.
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@param psi_key PSI key.
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*/
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explicit Plugin_array(PSI_memory_key psi_key)
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: Prealloced_array<plugin_ref, 2>(psi_key) {}
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/**
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Check, whether the plugin specified by the plugin argument has been
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already added into the array.
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@param plugin Plugin to check.
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@retval true Plugin has been already added.
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@retval false There is no plugin in the array.
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*/
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bool exists(plugin_ref plugin) {
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Plugin_array::iterator i;
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for (i = begin(); i != end(); ++i)
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if (plugin_equals(*i, plugin)) return true;
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return false;
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}
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};
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#endif // SQL_PLUGIN_REF_INCLUDED
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