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#include "../base/SRC_FIRST.hpp"
#include "file_container.hpp"
#include "read_write_utils.hpp"
#include "write_to_sink.hpp"
#include "internal/file_data.hpp"
template <class TSource> void Read(TSource & src, FilesContainerBase::Info & i)
{
rw::Read(src, i.m_tag);
i.m_offset = ReadVarUint<uint64_t>(src);
i.m_size = ReadVarUint<uint64_t>(src);
}
template <class TSink> void Write(TSink & sink, FilesContainerBase::Info const & i)
{
rw::Write(sink, i.m_tag);
WriteVarUint(sink, i.m_offset);
WriteVarUint(sink, i.m_size);
}
/////////////////////////////////////////////////////////////////////////////
// FilesContainerBase
/////////////////////////////////////////////////////////////////////////////
template <class ReaderT>
void FilesContainerBase::ReadInfo(ReaderT & reader)
{
uint64_t offset = ReadPrimitiveFromPos<uint64_t>(reader, 0);
ReaderSource<ReaderT> src(reader);
src.Skip(offset);
rw::Read(src, m_info);
}
/////////////////////////////////////////////////////////////////////////////
// FilesContainerR
/////////////////////////////////////////////////////////////////////////////
FilesContainerR::FilesContainerR(string const & fName,
uint32_t logPageSize,
uint32_t logPageCount)
: m_source(new FileReader(fName, logPageSize, logPageCount))
{
ReadInfo(m_source);
}
FilesContainerR::FilesContainerR(ReaderT const & file)
: m_source(file)
{
ReadInfo(m_source);
}
FilesContainerR::ReaderT FilesContainerR::GetReader(Tag const & tag) const
{
InfoContainer::const_iterator i =
lower_bound(m_info.begin(), m_info.end(), tag, LessInfo());
if (i != m_info.end() && i->m_tag == tag)
return m_source.SubReader(i->m_offset, i->m_size);
else
MYTHROW(Reader::OpenException, (tag));
}
bool FilesContainerR::IsReaderExist(Tag const & tag) const
{
InfoContainer::const_iterator i =
lower_bound(m_info.begin(), m_info.end(), tag, LessInfo());
return (i != m_info.end() && i->m_tag == tag);
}
/////////////////////////////////////////////////////////////////////////////
// FilesContainerW
/////////////////////////////////////////////////////////////////////////////
FilesContainerW::FilesContainerW(string const & fName, FileWriter::Op op)
: m_name(fName), m_bFinished(false)
{
Open(op);
}
void FilesContainerW::Open(FileWriter::Op op)
{
m_bNeedRewrite = true;
switch (op)
{
case FileWriter::OP_WRITE_TRUNCATE:
break;
case FileWriter::OP_WRITE_EXISTING:
{
// read an existing service info
FileReader reader(m_name);
ReadInfo(reader);
// Important: in append mode we should sort info-vector by offsets
sort(m_info.begin(), m_info.end(), LessOffset());
break;
}
default:
ASSERT ( false, ("Unsupported options") );
break;
}
if (m_info.empty())
StartNew();
}
void FilesContainerW::StartNew()
{
// leave space for offset to service info
FileWriter writer(m_name);
uint64_t skip = 0;
writer.Write(&skip, sizeof(skip));
m_bNeedRewrite = false;
}
FilesContainerW::~FilesContainerW()
{
if (!m_bFinished)
Finish();
}
uint64_t FilesContainerW::SaveCurrentSize()
{
ASSERT(!m_bFinished, ());
uint64_t const curr = FileReader(m_name).Size();
if (!m_info.empty())
m_info.back().m_size = curr - m_info.back().m_offset;
return curr;
}
void FilesContainerW::DeleteSection(Tag const & tag)
{
{
// rewrite files on disk
FilesContainerR contR(m_name);
FilesContainerW contW(m_name + ".tmp");
for (size_t i = 0; i < m_info.size(); ++i)
{
if (m_info[i].m_tag != tag)
contW.Write(contR.GetReader(m_info[i].m_tag), m_info[i].m_tag);
}
}
// swap files
if (!my::DeleteFileX(m_name) || !my::RenameFileX(m_name + ".tmp", m_name))
MYTHROW(RootException, ("Can't rename file", m_name, "Sharing violation or disk error!"));
// do open to update m_info
Open(FileWriter::OP_WRITE_EXISTING);
}
FileWriter FilesContainerW::GetWriter(Tag const & tag)
{
ASSERT(!m_bFinished, ());
InfoContainer::const_iterator it = find_if(m_info.begin(), m_info.end(), EqualTag(tag));
if (it != m_info.end())
{
if (it+1 == m_info.end())
{
m_info.pop_back();
if (m_info.empty())
StartNew();
else
m_bNeedRewrite = true;
}
else
{
DeleteSection(it->m_tag);
}
}
if (m_bNeedRewrite)
{
m_bNeedRewrite = false;
ASSERT ( !m_info.empty(), () );
uint64_t const curr = m_info.back().m_offset + m_info.back().m_size;
m_info.push_back(Info(tag, curr));
FileWriter writer(m_name, FileWriter::OP_WRITE_EXISTING, true);
writer.Seek(curr);
return writer;
}
else
{
uint64_t const curr = SaveCurrentSize();
m_info.push_back(Info(tag, curr));
return FileWriter(m_name, FileWriter::OP_APPEND);
}
}
void FilesContainerW::Write(string const & fPath, Tag const & tag)
{
Write(new FileReader(fPath), tag);
}
void FilesContainerW::Write(ModelReaderPtr reader, Tag const & tag)
{
ReaderSource<ModelReaderPtr> src(reader);
FileWriter writer = GetWriter(tag);
rw::ReadAndWrite(src, writer, 4*1024);
}
void FilesContainerW::Write(vector<char> const & buffer, Tag const & tag)
{
if (!buffer.empty())
GetWriter(tag).Write(&buffer[0], buffer.size());
}
void FilesContainerW::Finish()
{
ASSERT(!m_bFinished, ());
uint64_t const curr = SaveCurrentSize();
FileWriter writer(m_name, FileWriter::OP_WRITE_EXISTING);
writer.Seek(0);
WriteToSink(writer, curr);
writer.Seek(curr);
sort(m_info.begin(), m_info.end(), LessInfo());
rw::Write(writer, m_info);
m_bFinished = true;
}
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