folly::RecordIOReader::Iterator Class Reference

#include <RecordIO-inl.h>

Inheritance diagram for folly::RecordIOReader::Iterator:

Private Member Functions
	Iterator (ByteRange range, uint32_t fileId, off_t pos)
reference	dereference () const
bool	equal (const Iterator &other) const
void	increment ()
void	advanceToValid ()

Private Attributes
ByteRange	range_
uint32_t	fileId_
std::pair< ByteRange, off_t >	recordAndPos_

Friends
class	boost::iterator_core_access
class	RecordIOReader

Detailed Description

Definition at line 27 of file RecordIO-inl.h.

Constructor & Destructor Documentation

folly::RecordIOReader::Iterator::Iterator ( ByteRange  range, uint32_t  fileId, off_t  pos  )

private

Definition at line 75 of file RecordIO.cpp.

References folly::Range< Iter >::advance(), advanceToValid(), folly::Range< Iter >::clear(), range_, recordAndPos_, and folly::Range< Iter >::size().

Referenced by folly::RecordIOReader::seek().

    : range_(range), fileId_(fileId), recordAndPos_(ByteRange(), 0) {
  if (size_t(pos) >= range_.size()) {
    // Note that this branch can execute if pos is negative as well.
    recordAndPos_.second = off_t(-1);
    range_.clear();
  } else {
    recordAndPos_.second = pos;
    range_.advance(size_t(pos));
    advanceToValid();
  }
}

Member Function Documentation

void folly::RecordIOReader::Iterator::advanceToValid ( )

private

Definition at line 88 of file RecordIO.cpp.

References folly::Range< Iter >::advance(), folly::Range< Iter >::begin(), folly::Range< Iter >::clear(), folly::Range< Iter >::data(), folly::Range< Iter >::empty(), fileId_, folly::hash::SpookyHashV2::Final(), folly::recordio_helpers::findRecord(), folly::hash::SpookyHashV2::Hash32(), folly::hash::SpookyHashV2::Hash64(), folly::recordio_helpers::headerSize(), folly::hash::SpookyHashV2::Init(), max, folly::range(), range_, folly::recordio_helpers::RecordInfo::record, recordAndPos_, folly::Range< Iter >::size(), uint32_t, uint64_t, and folly::hash::SpookyHashV2::Update().

Referenced by increment(), and Iterator().

                                            {
  ByteRange record = findRecord(range_, fileId_).record;
  if (record.empty()) {
    recordAndPos_ = std::make_pair(ByteRange(), off_t(-1));
    range_.clear(); // at end
  } else {
    size_t skipped = size_t(record.begin() - range_.begin());
    DCHECK_GE(skipped, headerSize());
    skipped -= headerSize();
    range_.advance(skipped);
    recordAndPos_.first = record;
    recordAndPos_.second += off_t(skipped);
  }
}

reference folly::RecordIOReader::Iterator::dereference ( ) const

inlineprivate

Definition at line 37 of file RecordIO-inl.h.

References recordAndPos_.

                                {
    return recordAndPos_;
  }

bool folly::RecordIOReader::Iterator::equal ( const Iterator &  other ) const

inlineprivate

Definition at line 40 of file RecordIO-inl.h.

References range_.

                                          {
    return range_ == other.range_;
  }

void folly::RecordIOReader::Iterator::increment ( )

inlineprivate

Definition at line 43 of file RecordIO-inl.h.

References folly::Range< Iter >::advance(), advanceToValid(), folly::recordio_helpers::headerSize(), range_, recordAndPos_, and folly::gen::skip().

                   {
    size_t skip = recordio_helpers::headerSize() + recordAndPos_.first.size();
    recordAndPos_.second += off_t(skip);
    range_.advance(skip);
    advanceToValid();
  }

Friends And Related Function Documentation

friend class boost::iterator_core_access

friend

Definition at line 31 of file RecordIO-inl.h.

friend class RecordIOReader

friend

Definition at line 32 of file RecordIO-inl.h.

Member Data Documentation

uint32_t folly::RecordIOReader::Iterator::fileId_

private

Definition at line 52 of file RecordIO-inl.h.

Referenced by advanceToValid(), and folly::RecordIOReader::seek().

ByteRange folly::RecordIOReader::Iterator::range_

private

Definition at line 51 of file RecordIO-inl.h.

Referenced by advanceToValid(), equal(), increment(), and Iterator().

std::pair<ByteRange, off_t> folly::RecordIOReader::Iterator::recordAndPos_

private

Definition at line 54 of file RecordIO-inl.h.

Referenced by advanceToValid(), dereference(), increment(), and Iterator().

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The documentation for this class was generated from the following files:

• proxygen/folly/folly/io/RecordIO-inl.h
• proxygen/folly/folly/io/RecordIO.cpp