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Description

This class is a abstract base class for dealing with a data source.
Several methods such as TArtDataSource::Open, TArtDataSource::Close, TArtDataSource::Read andTArtDataSource::GetNextBlock shoud be implemented in each derived class.
The derived class itself might be a singleton.

Function members

protected

• TArtDataSource (int id = 0)
• TArtDataFormat *fFormat
• int fID
• ArtBlockStat_t fBlockStatus
• ArtFileStat_t fFileStatus
• ArtDataSource_t fDataSourceType

public

• static const int kMaxBufferSize = 128 * 1024 = 128kByte
• virtual ~TArtDataSource()
• virtual bool SMOpen(const int sid = 0)
• virtual bool FileOpen(const char* sourceName = 0)
• virtual int GetRunNumber() = 0
• virtual void Close() = 0
• virtual int Read ( char *buf, const int& size, const int &offset =0) = 0
• virtual int Seek ( long offset, int origin) = 0
• virtual int IsPrepared()
• virtual int Wait()
  
  
• void SetBlockStatus( ArtBlockStat_t estat)
• void SetFileStatus ( ArtFileStat_t estat)
• ArtBlockStat_t GetBlockStatus()
• ArtFileStat_t GetFileStatus()
• ArtDataSource_t GetDataSourceType()

private

Function documents

• TArtDataSource(int id)

Assign id to fID.

• virtual bool SMOpen(const int sid)

Return false.

• virtual bool FileOpen(const char* sourceName)

Return false.

• virtual int IsPrepared()

Mainly for shared memory data source to check data exists or not and lock semaphore.
Always return 1.

• virtual int Wait()

Mainly for shared memory data source to unlock semaphore.
Always return 1.