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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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* Copyright (C) 2008-2009 Sun Microsystems
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* Jay Pipes <joinfu@sun.com>
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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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* @file Server-side utility which is responsible for managing the
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* communication between the kernel, replicator plugins, and applier plugins.
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* TransactionServices is a bridge between modules and the kernel, and its
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* primary function is to take internal events (for instance the start of a
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* transaction, the changing of a record, or the rollback of a transaction)
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* and construct GPB Messages that are passed to the registered replicator and
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* The reason for this functionality is to encapsulate all communication
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* between the kernel and the replicator/applier plugins into GPB Messages.
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* Instead of the plugin having to understand the (often fluidly changing)
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* mechanics of the kernel, all the plugin needs to understand is the message
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* format, and GPB messages provide a nice, clear, and versioned format for
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* @see /drizzled/message/transaction.proto
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#include "drizzled/server_includes.h"
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#include "drizzled/transaction_services.h"
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#include "drizzled/plugin/replicator.h"
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#include "drizzled/plugin/applier.h"
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#include "drizzled/message/transaction.pb.h"
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#include "drizzled/message/table.pb.h"
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#include "drizzled/gettext.h"
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#include "drizzled/session.h"
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#include "drizzled/plugin_registry.h"
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drizzled::TransactionServices transaction_services;
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void add_replicator(drizzled::plugin::Replicator *repl)
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transaction_services.attachReplicator(repl);
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void remove_replicator(drizzled::plugin::Replicator *repl)
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transaction_services.detachReplicator(repl);
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void TransactionServices::attachReplicator(drizzled::plugin::Replicator *in_replicator)
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replicators.push_back(in_replicator);
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void TransactionServices::detachReplicator(drizzled::plugin::Replicator *in_replicator)
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replicators.erase(std::find(replicators.begin(), replicators.end(), in_replicator));
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void TransactionServices::attachApplier(drizzled::plugin::Applier *in_applier)
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appliers.push_back(in_applier);
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void TransactionServices::detachApplier(drizzled::plugin::Applier *in_applier)
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appliers.erase(std::find(appliers.begin(), appliers.end(), in_applier));
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void TransactionServices::setCommandTransactionContext(drizzled::message::Command *in_command
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, Session *in_session) const
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using namespace drizzled::message;
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TransactionContext *trx= in_command->mutable_transaction_context();
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trx->set_server_id(in_session->getServerId());
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trx->set_transaction_id(in_session->getTransactionId());
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void TransactionServices::startTransaction(Session *in_session)
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using namespace drizzled::message;
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if (replicators.size() == 0 || appliers.size() == 0)
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command.set_type(Command::START_TRANSACTION);
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command.set_timestamp(in_session->getCurrentTimestamp());
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setCommandTransactionContext(&command, in_session);
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void TransactionServices::commitTransaction(Session *in_session)
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using namespace drizzled::message;
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if (replicators.size() == 0 || appliers.size() == 0)
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command.set_type(Command::COMMIT);
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command.set_timestamp(in_session->getCurrentTimestamp());
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setCommandTransactionContext(&command, in_session);
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void TransactionServices::rollbackTransaction(Session *in_session)
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using namespace drizzled::message;
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if (replicators.size() == 0 || appliers.size() == 0)
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command.set_type(Command::ROLLBACK);
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command.set_timestamp(in_session->getCurrentTimestamp());
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setCommandTransactionContext(&command, in_session);
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void TransactionServices::insertRecord(Session *in_session, Table *in_table)
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using namespace drizzled::message;
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if (replicators.size() == 0 || appliers.size() == 0)
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command.set_type(Command::INSERT);
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command.set_timestamp(in_session->getCurrentTimestamp());
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setCommandTransactionContext(&command, in_session);
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const char *schema_name= in_table->getShare()->db.str;
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const char *table_name= in_table->getShare()->table_name.str;
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command.set_schema(schema_name);
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command.set_table(table_name);
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* Now we construct the specialized InsertRecord command inside
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* the Command container...
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InsertRecord *change_record= command.mutable_insert_record();
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Field *current_field;
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Field **table_fields= in_table->field;
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String *string_value= new (in_session->mem_root) String(100); /* 100 initially. field->val_str() is responsible for re-adjusting */
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string_value->set_charset(system_charset_info);
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Table::Field *cur_field;
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while ((current_field= *table_fields++) != NULL)
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cur_field= change_record->add_insert_field();
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cur_field->set_name(std::string(current_field->field_name));
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cur_field->set_type(Table::Field::VARCHAR); /* @TODO real types! */
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string_value= current_field->val_str(string_value);
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change_record->add_insert_value(std::string(string_value->c_ptr()));
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string_value->free(); /* I wish there was a clear() method... */
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delete string_value; /* Is this needed with memroot allocation? */
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void TransactionServices::updateRecord(Session *in_session, Table *in_table, const unsigned char *, const unsigned char *)
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using namespace drizzled::message;
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if (replicators.size() == 0 || appliers.size() == 0)
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command.set_type(Command::UPDATE);
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command.set_timestamp(in_session->getCurrentTimestamp());
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setCommandTransactionContext(&command, in_session);
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const char *schema_name= in_table->getShare()->db.str;
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const char *table_name= in_table->getShare()->table_name.str;
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command.set_schema(schema_name);
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command.set_table(table_name);
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* Now we construct the specialized UpdateRecord command inside
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* the Command container...
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//UpdateRecord *change_record= command.mutable_update_record();
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void TransactionServices::deleteRecord(Session *in_session, Table *in_table)
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using namespace drizzled::message;
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if (replicators.size() == 0 || appliers.size() == 0)
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command.set_type(Command::DELETE);
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command.set_timestamp(in_session->getCurrentTimestamp());
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setCommandTransactionContext(&command, in_session);
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const char *schema_name= in_table->getShare()->db.str;
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const char *table_name= in_table->getShare()->table_name.str;
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command.set_schema(schema_name);
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command.set_table(table_name);
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* Now we construct the specialized DeleteRecord command inside
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* the Command container...
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//DeleteRecord *change_record= command.mutable_delete_record();
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void TransactionServices::rawStatement(Session *in_session, const char *in_query, size_t in_query_len)
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using namespace drizzled::message;
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if (replicators.size() == 0 || appliers.size() == 0)
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command.set_type(Command::RAW_SQL);
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command.set_timestamp(in_session->getCurrentTimestamp());
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setCommandTransactionContext(&command, in_session);
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std::string query(in_query, in_query_len);
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command.set_sql(query);
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void TransactionServices::push(drizzled::message::Command *to_push)
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std::vector<drizzled::plugin::Replicator *>::iterator repl_iter= replicators.begin();
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std::vector<drizzled::plugin::Applier *>::iterator appl_start_iter, appl_iter;
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appl_start_iter= appliers.begin();
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drizzled::plugin::Replicator *cur_repl;
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drizzled::plugin::Applier *cur_appl;
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while (repl_iter != replicators.end())
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cur_repl= *repl_iter;
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if (! cur_repl->isActive())
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appl_iter= appl_start_iter;
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while (appl_iter != appliers.end())
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cur_appl= *appl_iter;
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if (! cur_appl->isActive())
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cur_repl->replicate(cur_appl, to_push);
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} /* end namespace drizzled */