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// Copyright (c) 2011, Cornell University
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of HyperDex nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
#ifndef hyperdisk_log_entry_h_
#define hyperdisk_log_entry_h_
// STL
#include <tr1/memory>
#include <vector>
// e
#include <e/buffer.h>
// HyperspaceHashing
#include "hyperspacehashing/hyperspacehashing/mask.h"
namespace hyperdisk
{
// A ``log_entry`` represents one change to the hyperdisk. The mask fields of
// the coord member must be 0 or UINT64_MAX. The former indicates their
// absence while the latter indicates their presence. Thus,
// coordinate(UINT64_MAX, X, UINT64_MAX, Y) is a PUT while
// coordinate(UINT64_MAX, X, 0, 0) is a DEL. coordinate(0, 0, 0, 0) indicates a
// dummy log entry.
class log_entry
{
public:
log_entry();
log_entry(const hyperspacehashing::mask::coordinate& coord,
std::tr1::shared_ptr<e::buffer> backing,
const e::slice& key,
const std::vector<e::slice>& value,
uint64_t version);
log_entry(const hyperspacehashing::mask::coordinate& coord,
std::tr1::shared_ptr<e::buffer> backing,
const e::slice& key);
public:
hyperspacehashing::mask::coordinate coord;
bool is_put;
std::tr1::shared_ptr<e::buffer> backing;
e::slice key;
std::vector<e::slice> value;
uint64_t version;
};
inline
log_entry :: log_entry()
: coord()
, is_put()
, backing()
, key()
, value()
, version()
{
}
inline
log_entry :: log_entry(const hyperspacehashing::mask::coordinate& c,
std::tr1::shared_ptr<e::buffer> b,
const e::slice& k,
const std::vector<e::slice>& va,
uint64_t ve)
: coord(c)
, is_put(true)
, backing(b)
, key(k)
, value(va)
, version(ve)
{
}
inline
log_entry :: log_entry(const hyperspacehashing::mask::coordinate& c,
std::tr1::shared_ptr<e::buffer> b,
const e::slice& k)
: coord(c)
, is_put(false)
, backing(b)
, key(k)
, value()
, version()
{
}
} // namespace hyperdisk
#endif // hyperdisk_log_entry_h_