-// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
-// vim: ts=8 sw=2 smarttab
-/*
- * Ceph - scalable distributed file system
- *
- * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
- *
- * This is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License version 2.1, as published by the Free Software
- * Foundation. See file COPYING.
- *
- */
-
-#ifndef CEPH_MDSTABLECLIENT_H
-#define CEPH_MDSTABLECLIENT_H
-
-#include "include/types.h"
-#include "MDSContext.h"
-#include "mds_table_types.h"
-
-class MDSRank;
-class LogSegment;
-class MMDSTableRequest;
-
-class MDSTableClient {
-protected:
- MDSRank *mds;
- int table;
-
- uint64_t last_reqid;
-
- bool server_ready;
-
- // prepares
- struct _pending_prepare {
- MDSInternalContextBase *onfinish;
- version_t *ptid;
- bufferlist *pbl;
- bufferlist mutation;
-
- _pending_prepare() : onfinish(0), ptid(0), pbl(0) {}
- _pending_prepare(MDSInternalContextBase *c, version_t *pt, bufferlist *pb, bufferlist& m) :
- onfinish(c), ptid(pt), pbl(pb), mutation(m) {}
- };
-
- map<uint64_t, _pending_prepare> pending_prepare;
- map<version_t, uint64_t> prepared_update;
- list<_pending_prepare> waiting_for_reqid;
-
- // pending commits
- map<version_t, LogSegment*> pending_commit;
- map<version_t, list<MDSInternalContextBase*> > ack_waiters;
-
- void handle_reply(class MMDSTableQuery *m);
- void _logged_ack(version_t tid);
- friend class C_LoggedAck;
-
-public:
- MDSTableClient(MDSRank *m, int tab) :
- mds(m), table(tab), last_reqid(~0ULL), server_ready(false) {}
- virtual ~MDSTableClient() {}
-
- void handle_request(MMDSTableRequest *m);
-
- void _prepare(bufferlist& mutation, version_t *ptid, bufferlist *pbl, MDSInternalContextBase *onfinish);
- void commit(version_t tid, LogSegment *ls);
-
- void resend_commits();
- void resend_prepares();
-
- // for recovery (by me)
- void got_journaled_agree(version_t tid, LogSegment *ls);
- void got_journaled_ack(version_t tid);
-
- bool has_committed(version_t tid) const {
- return pending_commit.count(tid) == 0;
- }
- void wait_for_ack(version_t tid, MDSInternalContextBase *c) {
- ack_waiters[tid].push_back(c);
- }
-
- void handle_mds_failure(mds_rank_t mds);
-
- // child must implement
- virtual void resend_queries() = 0;
- virtual void handle_query_result(MMDSTableRequest *m) = 0;
-
- // and friendly front-end for _prepare.
-
-};
-
-#endif