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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
/**
* \file wrfc.cpp
*
* Qpid asynchronous store plugin library
*
* File containing code for class mrg::journal::wrfc (rotating
* file controller). See comments in file wrfc.h for details.
*
* \author Kim van der Riet
*/
#include "qpid/legacystore/jrnl/wrfc.h"
#include <cmath>
#include "qpid/legacystore/jrnl/jerrno.h"
#include "qpid/legacystore/jrnl/jexception.h"
namespace mrg
{
namespace journal
{
wrfc::wrfc(const lpmgr* lpmp):
rfc(lpmp),
_fsize_sblks(0),
_fsize_dblks(0),
_enq_cap_offs_dblks(0),
_rid(0),
_reset_ok(false),
_owi(false),
_frot(true)
{}
wrfc::~wrfc()
{}
void
wrfc::initialize(const u_int32_t fsize_sblks, rcvdat* rdp)
{
if (rdp)
{
_fc_index = rdp->_lfid;
_curr_fc = _lpmp->get_fcntlp(_fc_index);
_curr_fc->wr_reset(rdp);
_rid = rdp->_h_rid + 1;
_reset_ok = true;
_owi = rdp->_owi;
_frot = rdp->_frot;
if (rdp->_lffull)
rotate();
}
else
{
rfc::initialize();
rfc::set_findex(0);
_rid = 0ULL;
_reset_ok = false;
}
_fsize_sblks = fsize_sblks;
_fsize_dblks = fsize_sblks * JRNL_SBLK_SIZE;
_enq_cap_offs_dblks = (u_int32_t)std::ceil(_fsize_dblks * _lpmp->num_jfiles() * (100.0 - JRNL_ENQ_THRESHOLD) / 100);
// Check the offset is at least one file; if not, make it so
if (_enq_cap_offs_dblks < _fsize_dblks)
_enq_cap_offs_dblks = _fsize_dblks;
}
iores wrfc::rotate()
{
if (!_lpmp->num_jfiles())
throw jexception(jerrno::JERR__NINIT, "wrfc", "rotate");
_fc_index++;
if (_fc_index == _lpmp->num_jfiles())
{
_fc_index = 0;
_owi = !_owi;
_frot = false;
}
_curr_fc = _lpmp->get_fcntlp(_fc_index);
if (_curr_fc->aio_cnt())
return RHM_IORES_FILE_AIOWAIT;
if (!wr_reset()) //Checks if file is still in use (ie not fully dequeued yet)
return RHM_IORES_FULL;
return RHM_IORES_SUCCESS;
}
u_int16_t wrfc::earliest_index() const
{
if (_frot)
return 0;
u_int16_t next_index = _fc_index + 1;
if (next_index >= _lpmp->num_jfiles())
next_index = 0;
return next_index;
}
bool
wrfc::enq_threshold(const u_int32_t enq_dsize_dblks) const
{
u_int32_t subm_dblks = subm_cnt_dblks(); // includes file hdr if > 0
// This compensates for new files which don't have their file headers written yet,
// as file header space cannot be included in this calculation.
if (subm_dblks != 0)
subm_dblks -= 4;
u_int32_t fwd_dblks = subm_dblks + enq_dsize_dblks + _enq_cap_offs_dblks;
u_int16_t findex = _fc_index;
fcntl* fcp = _curr_fc;
bool in_use = false;
while (fwd_dblks && !(findex != _fc_index && fcp->enqcnt()))
{
fwd_dblks -= fwd_dblks > _fsize_dblks ? _fsize_dblks : fwd_dblks;
if (fwd_dblks)
{
if (++findex == _lpmp->num_jfiles())
findex = 0;
fcp = _lpmp->get_fcntlp(findex);
}
in_use |= fcp->enqcnt() > 0;
}
// Return true if threshold exceeded
return findex != _fc_index && in_use;
}
bool wrfc::wr_reset()
{
_reset_ok = _curr_fc->reset(); // returns false if full (ie file still contains enqueued recs)
return _reset_ok;
}
// TODO: update this to reflect all status data
std::string
wrfc::status_str() const
{
std::ostringstream oss;
oss << "wrfc: " << rfc::status_str();
if (is_active())
oss << " fcntl[" << _fc_index << "]: " << _curr_fc->status_str();
return oss.str();
}
} // namespace journal
} // namespace mrg
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