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Viewing changes to drizzled/plugin/xa_resource_manager.cc

  • Committer: Brian Aker
  • Date: 2010-06-02 23:40:24 UTC
  • mto: (1578.6.9 explain-drizzle)
  • mto: This revision was merged to the branch mainline in revision 1585.
  • Revision ID: brian@gir-2.local-20100602234024-x26qr3pfhvood1d7
keys and fields partial encapsulation.

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drizzled/plugin/xa_resource_manager.cc
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#include "config.h"
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#include "drizzled/my_hash.h"
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#include "drizzled/cached_directory.h"
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#include <drizzled/definitions.h>
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#include <algorithm>
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#include <functional>
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using namespace std;
 
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namespace drizzled
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{
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namespace plugin
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{
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static std::vector<XaResourceManager *> xa_resource_managers;
 
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static vector<XaResourceManager *> xa_resource_managers;
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int XaResourceManager::commitOrRollbackXID(XID *xid, bool commit)
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{
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  std::vector<int> results;
 
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  vector<int> results;
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  if (commit)
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    transform(xa_resource_managers.begin(), xa_resource_managers.end(), results.begin(),
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              std::bind2nd(std::mem_fun(&XaResourceManager::xaCommitXid), xid));
 
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              bind2nd(mem_fun(&XaResourceManager::xaCommitXid), xid));
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  else
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    transform(xa_resource_managers.begin(), xa_resource_managers.end(), results.begin(),
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              std::bind2nd(std::mem_fun(&XaResourceManager::xaRollbackXid), xid));
 
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              bind2nd(mem_fun(&XaResourceManager::xaRollbackXid), xid));
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  if (std::find_if(results.begin(), results.end(), std::bind2nd(std::equal_to<int>(),0)) == results.end())
 
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  if (find_if(results.begin(), results.end(), bind2nd(equal_to<int>(),0))
 
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         == results.end())
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    return 1;
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  return 0;
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}
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  @note
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    there are three modes of operation:
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    - automatic recover after a crash
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    in this case commit_list.size() != 0, tc_heuristic_recover==0
 
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    in this case commit_list != 0, tc_heuristic_recover==0
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    all xids from commit_list are committed, others are rolled back
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    - manual (heuristic) recover
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    in this case commit_list.size()==0, tc_heuristic_recover != 0
 
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    in this case commit_list==0, tc_heuristic_recover != 0
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    DBA has explicitly specified that all prepared transactions should
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    be committed (or rolled back).
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    - no recovery (Drizzle did not detect a crash)
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    in this case commit_list.size()==0, tc_heuristic_recover == 0
 
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    - no recovery (MySQL did not detect a crash)
 
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    in this case commit_list==0, tc_heuristic_recover == 0
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    there should be no prepared transactions in this case.
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*/
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class XaRecover : std::unary_function<XaResourceManager *, void>
 
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class XaRecover : unary_function<XaResourceManager *, void>
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{
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private:
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  int trans_len, found_foreign_xids, found_my_xids;
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  bool result;
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  XID *trans_list;
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  const XaResourceManager::commit_list_set &commit_list;
 
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  HASH *commit_list;
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  bool dry_run;
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public:
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  XaRecover(XID *trans_list_arg, int trans_len_arg,
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            const XaResourceManager::commit_list_set& commit_list_arg,
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            bool dry_run_arg) 
 
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            HASH *commit_list_arg, bool dry_run_arg) 
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    : trans_len(trans_len_arg), found_foreign_xids(0), found_my_xids(0),
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      result(false),
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      trans_list(trans_list_arg), commit_list(commit_list_arg),
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          continue;
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        }
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        // recovery mode
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        if (commit_list.size() ?
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            commit_list.find(x) != commit_list.end() :
 
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        if (commit_list ?
 
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            hash_search(commit_list, (unsigned char *)&x, sizeof(x)) != 0 :
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            tc_heuristic_recover == TC_HEURISTIC_RECOVER_COMMIT)
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        {
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          resource_manager->xaCommitXid(trans_list+i);
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  }
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};
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int XaResourceManager::recoverAllXids()
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{
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  const XaResourceManager::commit_list_set empty_commit_set;
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  return recoverAllXids(empty_commit_set);
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}
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int XaResourceManager::recoverAllXids(const XaResourceManager::commit_list_set &commit_list)
 
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int XaResourceManager::recoverAllXids(HASH *commit_list)
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{
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  XID *trans_list= NULL;
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  int trans_len= 0;
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  bool dry_run= (commit_list.size() == 0 && tc_heuristic_recover==0);
 
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  bool dry_run= (commit_list==0 && tc_heuristic_recover==0);
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  /* commit_list and tc_heuristic_recover cannot be set both */
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  assert(commit_list.size() == 0 || tc_heuristic_recover == 0);
 
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  assert(commit_list==0 || tc_heuristic_recover==0);
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  if (xa_resource_managers.size() <= 1)
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    return 0;
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    return(1);
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  }
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  if (commit_list.size())
 
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  if (commit_list)
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    errmsg_printf(ERRMSG_LVL_INFO, _("Starting crash recovery..."));
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  XaRecover recover_func(trans_list, trans_len, commit_list, dry_run);
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  std::for_each(xa_resource_managers.begin(),
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                xa_resource_managers.end(),
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                recover_func);
 
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  for_each(xa_resource_managers.begin(),
 
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           xa_resource_managers.end(),
 
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           recover_func);
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  free(trans_list);
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  if (recover_func.getForeignXIDs())
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                    recover_func.getMyXIDs(), opt_tc_log_file);
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    return(1);
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  }
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  if (commit_list.size())
 
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  if (commit_list)
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    errmsg_printf(ERRMSG_LVL_INFO, _("Crash recovery finished."));
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  return(0);
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}