Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 316 insertions, 0 deletions

diff --git a/sql/rpl_injector.h b/sql/rpl_injector.h
new file mode 100644
index 00000000..669a8e29
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+++ b/sql/rpl_injector.h
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+/* Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1335  USA */
+
+#ifndef INJECTOR_H
+#define INJECTOR_H
+
+/* Pull in 'byte', 'my_off_t', and 'uint32' */
+#include <my_bitmap.h>
+
+#include "rpl_constants.h"
+#include "table.h"                              /* TABLE */
+
+/* Forward declarations */
+class handler;
+class MYSQL_BIN_LOG;
+struct TABLE;
+
+
+/*
+  Injector to inject rows into the MySQL server.
+  
+  The injector class is used to notify the MySQL server of new rows that have
+  appeared outside of MySQL control.
+ 
+  The original purpose of this is to allow clusters---which handle replication
+  inside the cluster through other means---to insert new rows into binary log.
+  Note, however, that the injector should be used whenever rows are altered in
+  any manner that is outside of MySQL server visibility and which therefore
+  are not seen by the MySQL server.
+ */
+class injector 
+{
+public:
+
+  /*
+    Get an instance of the injector.
+
+    DESCRIPTION
+      The injector is a Singleton, so this static function return the
+      available instance of the injector.
+
+    RETURN VALUE
+      A pointer to the available injector object.
+  */
+  static injector *instance();
+
+  /*
+    Delete the singleton instance (if allocated). Used during server shutdown.
+  */
+  static void free_instance();
+
+    /*
+      A transaction where rows can be added.
+
+      DESCRIPTION
+        The transaction class satisfy the **CopyConstructible** and
+        **Assignable** requirements.  Note that the transaction is *not*
+        default constructible.
+     */
+    class transaction {
+      friend class injector;
+    public:
+      /* Convenience definitions */
+      typedef uchar* record_type;
+      typedef uint32 server_id_type;
+
+      /*
+        Table reference.
+
+        RESPONSIBILITY
+
+          The class contains constructors to handle several forms of
+          references to tables.  The constructors can implicitly be used to
+          construct references from, e.g., strings containing table names.
+
+        EXAMPLE
+
+          The class is intended to be used *by value*.  Please, do not try to
+          construct objects of this type using 'new'; instead construct an
+          object, possibly a temporary object.  For example:
+
+            injector::transaction::table tbl(share->table, true);
+            MY_BITMAP cols;
+            my_bitmap_init(&cols, NULL, (i + 7) / 8, false);
+            inj->write_row(::server_id, tbl, &cols, row_data);
+
+          or
+
+            MY_BITMAP cols;
+            my_bitmap_init(&cols, NULL, (i + 7) / 8, false);
+            inj->write_row(::server_id, 
+                           injector::transaction::table(share->table, true), 
+                           &cols, row_data);
+
+          This will work, be more efficient, and have greater chance of
+          inlining, not run the risk of losing pointers.
+
+        COLLABORATION
+
+          injector::transaction
+            Provide a flexible interface to the representation of tables.
+
+      */
+      class table 
+      {
+      public:
+        table(TABLE *table, bool is_transactional_arg)
+            : m_table(table), m_is_transactional(is_transactional_arg)
+        { 
+        }
+
+        char const *db_name() const { return m_table->s->db.str; }
+        char const *table_name() const { return m_table->s->table_name.str; }
+        TABLE *get_table() const { return m_table; }
+        bool is_transactional() const { return m_is_transactional; }
+
+      private:
+        TABLE *m_table;
+        bool m_is_transactional;
+      };
+
+      /*
+        Binlog position as a structure.
+      */
+      class binlog_pos {
+        friend class transaction;
+      public:
+        char const *file_name() const { return m_file_name; }
+        my_off_t file_pos() const { return m_file_pos; }
+
+      private:
+        char const *m_file_name;
+        my_off_t m_file_pos;
+      };
+
+      transaction() : m_thd(NULL) { }
+      transaction(transaction const&);
+      ~transaction();
+
+      /* Clear transaction, i.e., make calls to 'good()' return false. */
+      void clear() { m_thd= NULL; }
+
+      /* Is the transaction in a good state? */
+      bool good() const { return m_thd != NULL; }
+
+      /* Default assignment operator: standard implementation */
+      transaction& operator=(transaction t) {
+        swap(t);
+        return *this;
+      }
+      
+      /*
+
+        DESCRIPTION
+
+          Register table for use within the transaction.  All tables
+          that are going to be used need to be registered before being
+          used below.  The member function will fail with an error if
+          use_table() is called after any *_row() function has been
+          called for the transaction.
+
+        RETURN VALUE
+
+          0         All OK
+          >0        Failure
+
+       */
+#ifdef TO_BE_DELETED
+      int use_table(server_id_type sid, table tbl);
+#endif
+      /*
+        Commit a transaction.
+
+        This member function will clean up after a sequence of *_row calls by,
+        for example, releasing resource and unlocking files.
+      */
+      int commit();
+
+      /*
+        Get the position for the start of the transaction.
+
+        Returns the position in the binary log of the first event in this
+        transaction. If no event is yet written, the position where the event
+        *will* be written is returned. This position is known, since a
+        new_transaction() will lock the binary log and prevent any other
+        writes to the binary log.
+      */
+      binlog_pos start_pos() const;
+
+    private:
+      /* Only the injector may construct these object */
+      transaction(MYSQL_BIN_LOG *, THD *);
+
+      void swap(transaction& o) {
+        /* std::swap(m_start_pos, o.m_start_pos); */
+        {
+          binlog_pos const tmp= m_start_pos;
+          m_start_pos= o.m_start_pos;
+          o.m_start_pos= tmp;
+        }
+
+        /* std::swap(m_thd, o.m_thd); */
+        {
+          THD* const tmp= m_thd;
+          m_thd= o.m_thd;
+          o.m_thd= tmp;
+        }
+        {
+          enum_state const tmp= m_state;
+          m_state= o.m_state;
+          o.m_state= tmp;
+        }
+      }
+
+      enum enum_state
+      {
+        START_STATE,                            /* Start state */
+        TABLE_STATE,      /* At least one table has been registered */
+        ROW_STATE,          /* At least one row has been registered */
+        STATE_COUNT               /* State count and sink state */
+      } m_state;
+
+      /*
+        Check and update the state.
+
+        PARAMETER(S)
+
+          target_state
+              The state we are moving to: TABLE_STATE if we are
+              writing a table and ROW_STATE if we are writing a row.
+
+        DESCRIPTION
+
+          The internal state will be updated to the target state if
+          and only if it is a legal move.  The only legal moves are:
+
+              START_STATE -> START_STATE
+              START_STATE -> TABLE_STATE
+              TABLE_STATE -> TABLE_STATE
+              TABLE_STATE -> ROW_STATE
+
+          That is:
+          - It is not possible to write any row before having written at
+            least one table
+          - It is not possible to write a table after at least one row
+            has been written
+
+        RETURN VALUE
+
+           0    All OK
+          -1    Incorrect call sequence
+       */
+      int check_state(enum_state const target_state)
+      {
+#ifndef DBUG_OFF
+        static char const *state_name[] = {
+          "START_STATE", "TABLE_STATE", "ROW_STATE", "STATE_COUNT"
+        };
+
+        DBUG_ASSERT(target_state <= STATE_COUNT);
+        DBUG_PRINT("info", ("In state %s", state_name[m_state]));
+#endif
+
+        if (m_state <= target_state && target_state <= m_state + 1 &&
+            m_state < STATE_COUNT)
+          m_state= target_state;
+        else
+          m_state= STATE_COUNT;
+        return m_state == STATE_COUNT ? 1 : 0;
+      }
+
+
+      binlog_pos m_start_pos;
+      THD *m_thd;
+    };
+
+    /* 
+       Create a new transaction.  This member function will prepare for a
+       sequence of *_row calls by, for example, reserving resources and
+       locking files. There are two overloaded alternatives: one returning a
+       transaction by value and one using placement semantics. The following
+       two calls are equivalent, with the exception that the latter will
+       overwrite the transaction.
+
+         injector::transaction trans1= inj->new_trans(thd);
+
+         injector::transaction trans2;
+         inj->new_trans(thd, &trans);
+     */
+    transaction new_trans(THD *);
+    void        new_trans(THD *, transaction *);
+
+    int record_incident(THD*, Incident incident);
+    int record_incident(THD*, Incident incident, const LEX_CSTRING *message);
+
+private:
+    explicit injector();
+    ~injector() { }             /* Nothing needs to be done */
+    injector(injector const&);  /* You're not allowed to copy injector
+                                   instances.
+                                */ 
+};
+
+#endif /* INJECTOR_H */