filecache.h

#ifndef VDR_LIVE_FILECACHE_H
#define VDR_LIVE_FILECACHE_H

#include "cache.h"

// STL headers need to be before VDR tools.h (included by <vdr/tools.h>)
#include <limits>
#include <string>
#include <ctime>
#include <vector>

#include <vdr/thread.h>

namespace vdrlive {

class FileObject
{
public:
  FileObject( std::string const& path )
    : m_ctime( std::numeric_limits<std::time_t>::max()  )
    , m_path( path ) {}

  std::size_t size() const { return m_data.size(); }
  std::size_t weight() const { return size(); }
  bool is_current() const { return m_ctime == get_filetime( m_path ); }
  bool load();
  char const* data() const { return &m_data[0]; }
  std::time_t ctime() const { return m_ctime; }

private:
  static std::time_t get_filetime( std::string const& path );

  mutable std::time_t m_ctime;
  std::string m_path;
  std::vector<char> m_data;
};

class FileCache: public vgstools::cache<std::string, FileObject>
{
  typedef vgstools::cache<std::string, FileObject> base_type;

public:
  FileCache( size_t maxWeight ): base_type( maxWeight ) {}

  ptr_type get( key_type const& key )
  {
    cMutexLock lock( &m_mutex );
    // dsyslog( "vdrlive::FileCache::get( %s )", key.c_str() );
    // dsyslog( "vdrlive::FileCache had %u entries (weight: %u)", count(), weight() );
    ptr_type result = base_type::get( key );
    // dsyslog( "vdrlive::FileCache now has %u entries (weight: %u)", count(), weight() );
    // dsyslog( "vdrlive::FileCache::get( %s ) = %p", key.c_str(), result.get() );
    return result;
  }

private:
  cMutex m_mutex;
};

//typedef vgstools::cache<std::string, FileObject> FileCache;
FileCache& LiveFileCache();

} // namespace vdrlive

#endif // VDR_LIVE_FILECACHE_H