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/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
/*
COPYING CONDITIONS NOTICE:
This program is free software; you can redistribute it and/or modify
it under the terms of version 2 of the GNU General Public License as
published by the Free Software Foundation, and provided that the
following conditions are met:
* Redistributions of source code must retain this COPYING
CONDITIONS NOTICE, the COPYRIGHT NOTICE (below), the
DISCLAIMER (below), the UNIVERSITY PATENT NOTICE (below), the
PATENT MARKING NOTICE (below), and the PATENT RIGHTS
GRANT (below).
* Redistributions in binary form must reproduce this COPYING
CONDITIONS NOTICE, the COPYRIGHT NOTICE (below), the
DISCLAIMER (below), the UNIVERSITY PATENT NOTICE (below), the
PATENT MARKING NOTICE (below), and the PATENT RIGHTS
GRANT (below) in the documentation and/or other materials
provided with the distribution.
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 Street, Fifth Floor, Boston, MA
02110-1335 USA.
COPYRIGHT NOTICE:
TokuFT, Tokutek Fractal Tree Indexing Library.
Copyright (C) 2014 Tokutek, Inc.
DISCLAIMER:
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.
UNIVERSITY PATENT NOTICE:
The technology is licensed by the Massachusetts Institute of
Technology, Rutgers State University of New Jersey, and the Research
Foundation of State University of New York at Stony Brook under
United States of America Serial No. 11/760379 and to the patents
and/or patent applications resulting from it.
PATENT MARKING NOTICE:
This software is covered by US Patent No. 8,185,551.
This software is covered by US Patent No. 8,489,638.
PATENT RIGHTS GRANT:
"THIS IMPLEMENTATION" means the copyrightable works distributed by
Tokutek as part of the Fractal Tree project.
"PATENT CLAIMS" means the claims of patents that are owned or
licensable by Tokutek, both currently or in the future; and that in
the absence of this license would be infringed by THIS
IMPLEMENTATION or by using or running THIS IMPLEMENTATION.
"PATENT CHALLENGE" shall mean a challenge to the validity,
patentability, enforceability and/or non-infringement of any of the
PATENT CLAIMS or otherwise opposing any of the PATENT CLAIMS.
Tokutek hereby grants to you, for the term and geographical scope of
the PATENT CLAIMS, a non-exclusive, no-charge, royalty-free,
irrevocable (except as stated in this section) patent license to
make, have made, use, offer to sell, sell, import, transfer, and
otherwise run, modify, and propagate the contents of THIS
IMPLEMENTATION, where such license applies only to the PATENT
CLAIMS. This grant does not include claims that would be infringed
only as a consequence of further modifications of THIS
IMPLEMENTATION. If you or your agent or licensee institute or order
or agree to the institution of patent litigation against any entity
(including a cross-claim or counterclaim in a lawsuit) alleging that
THIS IMPLEMENTATION constitutes direct or contributory patent
infringement, or inducement of patent infringement, then any rights
granted to you under this License shall terminate as of the date
such litigation is filed. If you or your agent or exclusive
licensee institute or order or agree to the institution of a PATENT
CHALLENGE, then Tokutek may terminate any rights granted to you
under this License.
*/
#pragma once
#include "ft/msg.h"
#include "ft/txn/xids.h"
#include "util/dbt.h"
class message_buffer {
public:
void create();
void clone(message_buffer *dst);
void destroy();
// effect: deserializes a message buffer from the given rbuf
// returns: *fresh_offsets (etc) malloc'd to be num_entries large and
// populated with *nfresh (etc) offsets in the message buffer
// requires: if fresh_offsets (etc) != nullptr, then nfresh != nullptr
void deserialize_from_rbuf(struct rbuf *rb,
int32_t **fresh_offsets, int32_t *nfresh,
int32_t **stale_offsets, int32_t *nstale,
int32_t **broadcast_offsets, int32_t *nbroadcast);
// effect: deserializes a message buffer whose messages are at version 13/14
// returns: similar to deserialize_from_rbuf(), excpet there are no stale messages
// and each message is assigned a sequential value from *highest_unused_msn_for_upgrade,
// which is modified as needed using toku_sync_fech_and_sub()
// returns: the highest MSN assigned to any message in this buffer
// requires: similar to deserialize_from_rbuf(), and highest_unused_msn_for_upgrade != nullptr
MSN deserialize_from_rbuf_v13(struct rbuf *rb,
MSN *highest_unused_msn_for_upgrade,
int32_t **fresh_offsets, int32_t *nfresh,
int32_t **broadcast_offsets, int32_t *nbroadcast);
void enqueue(const ft_msg &msg, bool is_fresh, int32_t *offset);
void set_freshness(int32_t offset, bool is_fresh);
bool get_freshness(int32_t offset) const;
ft_msg get_message(int32_t offset, DBT *keydbt, DBT *valdbt) const;
void get_message_key_msn(int32_t offset, DBT *key, MSN *msn) const;
int num_entries() const;
size_t buffer_size_in_use() const;
size_t memory_size_in_use() const;
size_t memory_footprint() const;
template <typename F>
int iterate(F &fn) const {
for (int32_t offset = 0; offset < _memory_used; ) {
DBT k, v;
const ft_msg msg = get_message(offset, &k, &v);
bool is_fresh = get_freshness(offset);
int r = fn(msg, is_fresh);
if (r != 0) {
return r;
}
offset += msg_memsize_in_buffer(msg);
}
return 0;
}
bool equals(message_buffer *other) const;
void serialize_to_wbuf(struct wbuf *wb) const;
static size_t msg_memsize_in_buffer(const ft_msg &msg);
private:
void _resize(size_t new_size);
// If this isn't packged, the compiler aligns the xids array and we waste a lot of space
struct __attribute__((__packed__)) buffer_entry {
unsigned int keylen;
unsigned int vallen;
unsigned char type;
bool is_fresh;
MSN msn;
XIDS_S xids_s;
};
struct buffer_entry *get_buffer_entry(int32_t offset) const;
int _num_entries;
char *_memory; // An array of bytes into which buffer entries are embedded.
int _memory_size; // How big is _memory
int _memory_used; // How many bytes are in use?
};
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