AdaptiveFileAllocationIterator.cc 3.81 KB
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/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2010 Tatsuhiro Tsujikawa
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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.
 *
 * 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 02110-1301 USA
 *
 * In addition, as a special exception, the copyright holders give
 * permission to link the code of portions of this program with the
 * OpenSSL library under certain conditions as described in each
 * individual source file, and distribute linked combinations
 * including the two.
 * You must obey the GNU General Public License in all respects
 * for all of the code used other than OpenSSL.  If you modify
 * file(s) with this exception, you may extend this exception to your
 * version of the file(s), but you are not obligated to do so.  If you
 * do not wish to do so, delete this exception statement from your
 * version.  If you delete this exception statement from all source
 * files in the program, then also delete it here.
 */
/* copyright --> */
#include "AdaptiveFileAllocationIterator.h"
#include "BinaryStream.h"
#include "SingleFileAllocationIterator.h"
#include "RecoverableException.h"
#include "LogFactory.h"
#include "Logger.h"
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#include "a2functional.h"
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#ifdef HAVE_FALLOCATE
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#include "FallocFileAllocationIterator.h"
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#endif // HAVE_FALLOCATE

namespace aria2 {

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AdaptiveFileAllocationIterator::AdaptiveFileAllocationIterator(
    BinaryStream* stream, int64_t offset, int64_t totalLength)
    : stream_(stream), offset_(offset), totalLength_(totalLength)
{
}
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AdaptiveFileAllocationIterator::~AdaptiveFileAllocationIterator() = default;
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void AdaptiveFileAllocationIterator::allocateChunk()
{
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  if (!allocator_) {
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#ifdef HAVE_FALLOCATE
    try {
      A2_LOG_DEBUG("Testing file system supports fallocate.");
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      if (offset_ < totalLength_) {
        int64_t len =
            std::min(totalLength_ - offset_, static_cast<int64_t>(4_k));
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        stream_->allocate(offset_, len, false);
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        offset_ += len;
      }
      A2_LOG_DEBUG("File system supports fallocate.");
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      allocator_ = make_unique<FallocFileAllocationIterator>(stream_, offset_,
                                                             totalLength_);
    }
    catch (RecoverableException& e) {
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      A2_LOG_DEBUG("File system does not support fallocate.");
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      auto salloc = make_unique<SingleFileAllocationIterator>(stream_, offset_,
                                                              totalLength_);
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      salloc->init();
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      allocator_ = std::move(salloc);
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    }
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#else  // !HAVE_FALLOCATE
    auto salloc = make_unique<SingleFileAllocationIterator>(stream_, offset_,
                                                            totalLength_);
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    salloc->init();
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    allocator_ = std::move(salloc);
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#endif // !HAVE_FALLOCATE
    allocator_->allocateChunk();
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  }
  else {
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    allocator_->allocateChunk();
  }
}
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bool AdaptiveFileAllocationIterator::finished()
{
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  if (!allocator_) {
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    return offset_ == totalLength_;
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  }
  else {
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    return allocator_->finished();
  }
}

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int64_t AdaptiveFileAllocationIterator::getCurrentLength()
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{
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  if (!allocator_) {
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    return offset_;
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  }
  else {
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    return allocator_->getCurrentLength();
  }
}

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int64_t AdaptiveFileAllocationIterator::getTotalLength()
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{
  return totalLength_;
}

} // namespace aria2