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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems, Inc.
* Copyright (C) 2010 Jay Pipes <jaypipes@gmail.com>
*
* 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 02110-1301 USA
*/
#include <config.h>
#include <drizzled/cached_directory.h>
#include <drizzled/definitions.h>
#include <drizzled/session.h>
#include <drizzled/error.h>
#include <drizzled/gettext.h>
#include <drizzled/plugin/xa_resource_manager.h>
#include <drizzled/xid.h>
#include <drizzled/errmsg_print.h>
#include <drizzled/sys_var.h>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
namespace drizzled {
namespace plugin {
static std::vector<XaResourceManager *> xa_resource_managers;
int XaResourceManager::commitOrRollbackXID(XID *xid, bool commit)
{
std::vector<int> results;
if (commit)
transform(xa_resource_managers.begin(), xa_resource_managers.end(), results.begin(),
std::bind2nd(std::mem_fun(&XaResourceManager::xaCommitXid), xid));
else
transform(xa_resource_managers.begin(), xa_resource_managers.end(), results.begin(),
std::bind2nd(std::mem_fun(&XaResourceManager::xaRollbackXid), xid));
if (std::find_if(results.begin(), results.end(), std::bind2nd(std::equal_to<int>(),0)) == results.end())
return 1;
return 0;
}
/**
recover() step of xa.
@note
there are three modes of operation:
- automatic recover after a crash
in this case commit_list.size() != 0, tc_heuristic_recover==0
all xids from commit_list are committed, others are rolled back
- manual (heuristic) recover
in this case commit_list.size()==0, tc_heuristic_recover != 0
DBA has explicitly specified that all prepared transactions should
be committed (or rolled back).
- no recovery (Drizzle did not detect a crash)
in this case commit_list.size()==0, tc_heuristic_recover == 0
there should be no prepared transactions in this case.
*/
class XaRecover : std::unary_function<XaResourceManager *, void>
{
private:
int trans_len, found_foreign_xids, found_my_xids;
bool result;
XID *trans_list;
const XaResourceManager::commit_list_set &commit_list;
bool dry_run;
public:
XaRecover(XID *trans_list_arg, int trans_len_arg,
const XaResourceManager::commit_list_set& commit_list_arg,
bool dry_run_arg)
: trans_len(trans_len_arg), found_foreign_xids(0), found_my_xids(0),
result(false),
trans_list(trans_list_arg), commit_list(commit_list_arg),
dry_run(dry_run_arg)
{}
int getForeignXIDs()
{
return found_foreign_xids;
}
int getMyXIDs()
{
return found_my_xids;
}
result_type operator() (argument_type resource_manager)
{
int got;
while ((got= resource_manager->xaRecover(trans_list, trans_len)) > 0 )
{
errmsg_printf(error::INFO,
_("Found %d prepared transaction(s) in resource manager."),
got);
for (int i=0; i < got; i ++)
{
my_xid x=trans_list[i].get_my_xid();
if (!x) // not "mine" - that is generated by external TM
{
found_foreign_xids++;
continue;
}
if (dry_run)
{
found_my_xids++;
continue;
}
// recovery mode
if (commit_list.size() ?
commit_list.find(x) != commit_list.end() :
tc_heuristic_recover == TC_HEURISTIC_RECOVER_COMMIT)
{
resource_manager->xaCommitXid(trans_list+i);
}
else
{
resource_manager->xaRollbackXid(trans_list+i);
}
}
if (got < trans_len)
break;
}
}
};
int XaResourceManager::recoverAllXids()
{
const XaResourceManager::commit_list_set empty_commit_set;
return recoverAllXids(empty_commit_set);
}
int XaResourceManager::recoverAllXids(const XaResourceManager::commit_list_set &commit_list)
{
XID *trans_list= NULL;
int trans_len= 0;
bool dry_run= (commit_list.size() == 0 && tc_heuristic_recover==0);
/* commit_list and tc_heuristic_recover cannot be set both */
assert(commit_list.size() == 0 || tc_heuristic_recover == 0);
if (xa_resource_managers.size() <= 1)
return 0;
tc_heuristic_recover= TC_HEURISTIC_RECOVER_ROLLBACK; // forcing ROLLBACK
dry_run=false;
for (trans_len= MAX_XID_LIST_SIZE ;
trans_list==0 && trans_len > MIN_XID_LIST_SIZE; trans_len/=2)
{
trans_list=(XID *)malloc(trans_len*sizeof(XID));
}
if (!trans_list)
{
errmsg_printf(error::ERROR, ER(ER_OUTOFMEMORY), trans_len*sizeof(XID));
return(1);
}
if (commit_list.size())
errmsg_printf(error::INFO, _("Starting crash recovery..."));
XaRecover recover_func(trans_list, trans_len, commit_list, dry_run);
std::for_each(xa_resource_managers.begin(),
xa_resource_managers.end(),
recover_func);
free(trans_list);
if (recover_func.getForeignXIDs())
errmsg_printf(error::WARN,
_("Found %d prepared XA transactions"),
recover_func.getForeignXIDs());
if (dry_run && recover_func.getMyXIDs())
{
errmsg_printf(error::ERROR,
_("Found %d prepared transactions! It means that drizzled "
"was not shut down properly last time and critical "
"recovery information (last binlog or %s file) was "
"manually deleted after a crash. You have to start "
"drizzled with the --tc-heuristic-recover switch to "
"commit or rollback pending transactions."),
recover_func.getMyXIDs(), opt_tc_log_file);
return(1);
}
if (commit_list.size())
errmsg_printf(error::INFO, _("Crash recovery finished."));
return(0);
}
bool XaResourceManager::addPlugin(XaResourceManager *resource_manager)
{
xa_resource_managers.push_back(resource_manager);
return false;
}
void XaResourceManager::removePlugin(XaResourceManager *)
{
xa_resource_managers.clear();
}
} /* namespace plugin */
} /* namespace drizzled */
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