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// -*- 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_LOGEVENT_H
#define CEPH_LOGEVENT_H
#define EVENT_STRING 1
#define EVENT_SUBTREEMAP 2
#define EVENT_EXPORT 3
#define EVENT_IMPORTSTART 4
#define EVENT_IMPORTFINISH 5
#define EVENT_FRAGMENT 6
#define EVENT_RESETJOURNAL 9
#define EVENT_SESSION 10
#define EVENT_SESSIONS 11
#define EVENT_UPDATE 20
#define EVENT_SLAVEUPDATE 21
#define EVENT_OPEN 22
#define EVENT_COMMITTED 23
#define EVENT_TABLECLIENT 42
#define EVENT_TABLESERVER 43
#define EVENT_SUBTREEMAP_TEST 50
#include <string>
using namespace std;
#include "include/buffer.h"
#include "include/Context.h"
#include "include/utime.h"
class MDS;
class LogSegment;
// generic log event
class LogEvent {
private:
__u32 _type;
uint64_t _start_off;
protected:
utime_t stamp;
friend class MDLog;
public:
LogSegment *_segment;
LogEvent(int t)
: _type(t), _start_off(0), _segment(0) { }
virtual ~LogEvent() { }
int get_type() const { return _type; }
void set_type(int t) { _type = t; }
uint64_t get_start_off() const { return _start_off; }
void set_start_off(uint64_t o) { _start_off = o; }
utime_t get_stamp() const { return stamp; }
void set_stamp(utime_t t) { stamp = t; }
// encoding
virtual void encode(bufferlist& bl) const = 0;
virtual void decode(bufferlist::iterator &bl) = 0;
static LogEvent *decode(bufferlist &bl);
void encode_with_header(bufferlist& bl) {
::encode(_type, bl);
encode(bl);
}
virtual void print(ostream& out) {
out << "event(" << _type << ")";
}
/*** live journal ***/
/* update_segment() - adjust any state we need to in the LogSegment
*/
virtual void update_segment() { }
/*** recovery ***/
/* replay() - replay given event. this is idempotent.
*/
virtual void replay(MDS *m) { assert(0); }
};
inline ostream& operator<<(ostream& out, LogEvent& le) {
le.print(out);
return out;
}
#endif
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