mirror of
https://github.com/ceph/ceph
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07ac5d3e74
git-svn-id: https://ceph.svn.sf.net/svnroot/ceph@1068 29311d96-e01e-0410-9327-a35deaab8ce9
98 lines
2.0 KiB
C++
98 lines
2.0 KiB
C++
// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
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/*
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* Ceph - scalable distributed file system
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*
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* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
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*
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* This is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License version 2.1, as published by the Free Software
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* Foundation. See file COPYING.
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*
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*/
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#ifndef __LOGEVENT_H
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#define __LOGEVENT_H
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#define EVENT_STRING 1
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#define EVENT_INODEUPDATE 2
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#define EVENT_DIRUPDATE 3
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#define EVENT_ALLOC 10
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#define EVENT_MKNOD 11
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#define EVENT_MKDIR 12
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#define EVENT_LINK 13
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#define EVENT_UNLINK 20
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#define EVENT_RMDIR 21
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#define EVENT_PURGEFINISH 22
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#include <string>
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using namespace std;
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#include "include/buffer.h"
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#include "include/Context.h"
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class MDS;
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// generic log event
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class LogEvent {
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private:
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int _type;
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off_t _end_off;
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friend class MDLog;
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public:
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LogEvent(int t) : _type(t), _end_off(0) { }
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virtual ~LogEvent() { }
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// encoding
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virtual void encode_payload(bufferlist& bl) = 0;
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virtual void decode_payload(bufferlist& bl, int& off) = 0;
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static LogEvent *decode(bufferlist &bl);
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virtual void print(ostream& out) {
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out << "event(" << _type << ")";
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}
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/*** live journal ***/
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/* obsolete() - is this entry committed to primary store, such that
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* we can expire it from the journal?
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*/
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virtual bool can_expire(MDS *m) {
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return true;
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}
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/* retire() - prod MDS into committing hte relevant state so that this
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* entry can be expired from the jorunal.
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*/
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virtual void retire(MDS *m, Context *c) {
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c->finish(0);
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delete c;
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}
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/*** recovery ***/
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/* has_happened() - true if this event has already been applied.
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*/
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virtual bool has_happened(MDS *m) { return true; }
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/* replay() - replay given event
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*/
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virtual void replay(MDS *m) { assert(0); }
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};
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inline ostream& operator<<(ostream& out, LogEvent& le) {
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le.print(out);
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return out;
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}
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#endif
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