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XrdFileCacheInfo.hh
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XrdFileCacheInfo.hh
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#ifndef __XRDFILECACHE_INFO_HH__
#define __XRDFILECACHE_INFO_HH__
//----------------------------------------------------------------------------------
// Copyright (c) 2014 by Board of Trustees of the Leland Stanford, Jr., University
// Author: Alja Mrak-Tadel, Matevz Tadel, Brian Bockelman
//----------------------------------------------------------------------------------
// XRootD is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// XRootD 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 Lesser General Public License
// along with XRootD. If not, see <http://www.gnu.org/licenses/>.
//----------------------------------------------------------------------------------
#include <stdio.h>
#include <time.h>
#include <assert.h>
#include "XrdSys/XrdSysPthread.hh"
#include "XrdCl/XrdClLog.hh"
#include "XrdCl/XrdClConstants.hh"
#include "XrdCl/XrdClDefaultEnv.hh"
class XrdOssDF;
namespace XrdCl
{
class Log;
}
namespace XrdFileCache
{
class Stats;
//----------------------------------------------------------------------------
//! Status of cached file. Can be read from and written into a binary file.
//----------------------------------------------------------------------------
class Info
{
private:
static unsigned char cfiBIT(int n) { return 1 << n; }
public:
// !Access statistics
struct AStat
{
time_t DetachTime; //! close time
long long BytesDisk; //! read from disk
long long BytesRam; //! read from ram
long long BytesMissed; //! read remote client
};
//------------------------------------------------------------------------
//! Constructor.
//------------------------------------------------------------------------
Info(long long bufferSize);
//------------------------------------------------------------------------
//! Destructor.
//------------------------------------------------------------------------
~Info();
//---------------------------------------------------------------------
//! \brief Mark block as downloaded
//!
//! @param i block index
//---------------------------------------------------------------------
void SetBitFetched(int i);
//! \brief Mark block as disk written
//!
//! @param i block index
//---------------------------------------------------------------------
void SetBitWriteCalled(int i);
//! \brief Mark block as written from prefetch
//!
//! @param i block index
//---------------------------------------------------------------------
void SetBitPrefetch(int i);
void SetFileSize(long long);
//---------------------------------------------------------------------
//! \brief Reserve buffer for fileSize/bufferSize bytes
//!
//! @param n number of file blocks
//---------------------------------------------------------------------
void ResizeBits(int n, bool prefetch_stat = false);
//---------------------------------------------------------------------
//! \brief Rea load content from cinfo file into this object
//!
//! @param fp file handle
//!
//! @return number of bytes read
//---------------------------------------------------------------------
int Read(XrdOssDF* fp, bool init_prefetch = false);
//---------------------------------------------------------------------
//! Write number of blocks and read buffer size
//---------------------------------------------------------------------
void WriteHeader(XrdOssDF* fp);
//---------------------------------------------------------------------
//! Append access time, and cache statistics
//---------------------------------------------------------------------
void AppendIOStat(AStat& stat, XrdOssDF* fp);
//---------------------------------------------------------------------
//! Check download status in given block range
//---------------------------------------------------------------------
bool IsAnythingEmptyInRng(int firstIdx, int lastIdx) const;
//---------------------------------------------------------------------
//! Get size of download-state bit-vector in bytes.
//---------------------------------------------------------------------
int GetSizeInBytes() const;
//---------------------------------------------------------------------
//! Get number of blocks represented in download-state bit-vector.
//---------------------------------------------------------------------
int GetSizeInBits() const;
//---------------------------------------------------------------------
//! Get file size
//---------------------------------------------------------------------
long long GetFileSize() const;
//----------------------------------------------------------------------
//! Get header size.
//----------------------------------------------------------------------
int GetHeaderSize() const;
//---------------------------------------------------------------------
//! Get latest detach time
//---------------------------------------------------------------------
bool GetLatestDetachTime(time_t& t, XrdOssDF* fp) const;
//---------------------------------------------------------------------
//! Get prefetch buffer size
//---------------------------------------------------------------------
long long GetBufferSize() const;
//---------------------------------------------------------------------
//! Test if block at the given index is downlaoded
//---------------------------------------------------------------------
bool TestBit(int i) const;
//---------------------------------------------------------------------
//! Test if block at the given index is prefetched
//---------------------------------------------------------------------
bool TestPrefetchBit(int i) const;
//---------------------------------------------------------------------
//! Get complete status
//---------------------------------------------------------------------
bool IsComplete() const;
//---------------------------------------------------------------------
//! Get number of downloaded blocks
//---------------------------------------------------------------------
int GetNDownloadedBlocks() const;
//---------------------------------------------------------------------
//! Get number of downloaded bytes
//---------------------------------------------------------------------
long long GetNDownloadedBytes() const;
//---------------------------------------------------------------------
//! Update complete status
//---------------------------------------------------------------------
void CheckComplete();
//---------------------------------------------------------------------
//! Get number of accesses
//---------------------------------------------------------------------
int GetAccessCnt() { return m_accessCnt; }
//---------------------------------------------------------------------
//! Get version
//---------------------------------------------------------------------
int GetVersion() { return m_version; }
const static char* m_infoExtension;
protected:
XrdCl::Log* clLog() const { return XrdCl::DefaultEnv::GetLog(); }
//---------------------------------------------------------------------
//! Cache statistics and time of access.
//---------------------------------------------------------------------
int m_version; //!< info version
long long m_bufferSize; //!< prefetch buffer size
long long m_fileSize; //!< number of file blocks
int m_sizeInBits; //!< number of file blocks
unsigned char *m_buff_fetched; //!< download state vector
unsigned char *m_buff_write_called; //!< disk written state vector
unsigned char *m_buff_prefetch; //!< prefetch state vector
int m_accessCnt; //!< number of written AStat structs
bool m_complete; //!< cached
};
inline bool Info::TestBit(int i) const
{
int cn = i/8;
assert(cn < GetSizeInBytes());
int off = i - cn*8;
return (m_buff_fetched[cn] & cfiBIT(off)) == cfiBIT(off);
}
// AMT could have only one function to test bit and pass an argument, but would loose clarity
inline bool Info::TestPrefetchBit(int i) const
{
int cn = i/8;
assert(cn < GetSizeInBytes());
int off = i - cn*8;
return (m_buff_prefetch[cn] & cfiBIT(off)) == cfiBIT(off);
}
inline int Info::GetNDownloadedBlocks() const
{
int cntd = 0;
for (int i = 0; i < m_sizeInBits; ++i)
if (TestBit(i)) cntd++;
return cntd;
}
inline long long Info::GetNDownloadedBytes() const
{
return m_bufferSize * GetNDownloadedBlocks();
}
inline int Info::GetSizeInBytes() const
{
return ((m_sizeInBits -1)/8 + 1);
}
inline int Info::GetSizeInBits() const
{
return m_sizeInBits;
}
inline long long Info::GetFileSize() const
{
return m_fileSize;
}
inline bool Info::IsComplete() const
{
return m_complete;
}
inline bool Info::IsAnythingEmptyInRng(int firstIdx, int lastIdx) const
{
for (int i = firstIdx; i <= lastIdx; ++i)
if (!TestBit(i)) return true;
return false;
}
inline void Info::CheckComplete()
{
m_complete = !IsAnythingEmptyInRng(0, m_sizeInBits-1);
}
inline void Info::SetBitWriteCalled(int i)
{
int cn = i/8;
assert(cn < GetSizeInBytes());
int off = i - cn*8;
m_buff_write_called[cn] |= cfiBIT(off);
}
inline void Info::SetBitFetched(int i)
{
int cn = i/8;
assert(cn < GetSizeInBytes());
int off = i - cn*8;
m_buff_fetched[cn] |= cfiBIT(off);
}
inline void Info::SetBitPrefetch(int i)
{
int cn = i/8;
assert(cn < GetSizeInBytes());
int off = i - cn*8;
m_buff_prefetch[cn] |= cfiBIT(off);
}
inline long long Info::GetBufferSize() const
{
return m_bufferSize;
}
}
#endif