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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 Sun Microsystems
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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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#include "drizzled/plugin/transactional_storage_engine.h"
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#include "drizzled/resource_context.h"
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#include "drizzled/session.h"
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static vector<TransactionalStorageEngine *> vector_of_transactional_engines;
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TransactionalStorageEngine::TransactionalStorageEngine(const string name_arg,
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const bitset<HTON_BIT_SIZE> &flags_arg,
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bool two_phase_commit_arg)
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: StorageEngine(name_arg, flags_arg),
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two_phase_commit(two_phase_commit_arg)
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TransactionalStorageEngine::~TransactionalStorageEngine()
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void TransactionalStorageEngine::setTransactionReadWrite(Session& session)
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ResourceContext *resource_context= session.getResourceContext(this);
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When a storage engine method is called, the transaction must
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have been started, unless it's a DDL call, for which the
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storage engine starts the transaction internally, and commits
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it internally, without registering in the ha_list.
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Unfortunately here we can't know know for sure if the engine
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has registered the transaction or not, so we must check.
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if (resource_context->isStarted())
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resource_context->markModifiedData();
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This function should be called when MySQL sends rows of a SELECT result set
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or the EOF mark to the client. It releases a possible adaptive hash index
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S-latch held by session in InnoDB and also releases a possible InnoDB query
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FIFO ticket to enter InnoDB. To save CPU time, InnoDB allows a session to
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keep them over several calls of the InnoDB Cursor interface when a join
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is executed. But when we let the control to pass to the client they have
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to be released because if the application program uses mysql_use_result(),
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it may deadlock on the S-latch if the application on another connection
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performs another SQL query. In MySQL-4.1 this is even more important because
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there a connection can have several SELECT queries open at the same time.
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@param session the thread handle of the current connection
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int TransactionalStorageEngine::releaseTemporaryLatches(Session *session)
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for_each(vector_of_transactional_engines.begin(), vector_of_transactional_engines.end(),
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bind2nd(mem_fun(&TransactionalStorageEngine::doReleaseTemporaryLatches),session));
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int TransactionalStorageEngine::startConsistentSnapshot(Session *session)
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for_each(vector_of_transactional_engines.begin(), vector_of_transactional_engines.end(),
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bind2nd(mem_fun(&TransactionalStorageEngine::doStartConsistentSnapshot),
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bool TransactionalStorageEngine::addPlugin(TransactionalStorageEngine *engine)
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vector_of_transactional_engines.push_back(engine);
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return StorageEngine::addPlugin(engine);
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void TransactionalStorageEngine::removePlugin(TransactionalStorageEngine *)
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vector_of_transactional_engines.clear();
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} /* namespace plugin */
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} /* namespace drizzled */
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drizzled/plugin/transactional_storage_engine.cc
