Namespaces
	IOFlags

Classes
class	DavixFile

class	DavixStorageMaker

class	DCacheFile

class	DCacheStorageMaker

class	File

class	GsiFTPStorageMaker

class	HttpStorageMaker

class	IOBuffer

struct	IOPosBuffer

class	LocalCacheFile

class	LocalFileSystem

class	LocalStorageMaker

class	LStoreFile

class	LStoreStorageMaker

class	RemoteFile

class	StatisticsSenderService

class	Storage

class	StorageAccount

class	StorageAccountProxy

class	StorageFactory

class	StorageMaker

class	StormLcgGtStorageMaker

class	StormStorageMaker

class	XrdFile

class	XrdStorageMaker

Typedefs
typedef int	IOFD

typedef int64_t	IOOffset

typedef size_t	IOSize

typedef edmplugin::PluginFactory < StorageMaker *()>	StorageMakerFactory

Enumerations
enum	IOMask { IORead = 0x01, IOWrite = 0x02, IOUrgent = 0x04, IOAccept = 0x08, IOConnect = 0x10 }

Functions
IOSize	IOSized (IOOffset n)

Variables
constexpr int	EDM_IOFD_INVALID = -1

constexpr int	PREFETCH_PROBE_LENGTH = 4096

Detailed Description

Proxy class that wraps SEAL's #Storage class with one that ticks #StorageAccount counters for significant operations. The returned #Storage objects from #StorageMaker are automatically wrapped with this class.

Future improvement would be to implement more methods so that the wrapper itself doesn't cause peroformance degradation if the base storage does actually implement "sophisticated" features.

Typedef Documentation

typedef int edm::storage::IOFD

Type the system uses for channel descriptors.

Definition at line 23 of file IOTypes.h.

typedef int64_t edm::storage::IOOffset

Type for file offsets for I/O operations, including file sizes. This type is always compatible with large files (64-bit offsets) whether the system supports them or not. This type is signed.

Definition at line 20 of file IOTypes.h.

typedef size_t edm::storage::IOSize

Type for buffer sizes in I/O operations. It measures units in memory: buffer sizes, amounts to read and write, etc., and is unsigned. Never use IOSize to measure file offsets, as it is most likely smaller than the file offset type on your system!

Definition at line 15 of file IOTypes.h.

typedef edmplugin::PluginFactory<StorageMaker *()> edm::storage::StorageMakerFactory

Definition at line 7 of file StorageMakerFactory.h.

Enumeration Type Documentation

enum edm::storage::IOMask

I/O operation mask.

Enumerator
IORead
IOWrite
IOUrgent
IOAccept
IOConnect

Definition at line 26 of file IOTypes.h.

               {
     IORead = 0x01,    //< Read
     IOWrite = 0x02,   //< Write
     IOUrgent = 0x04,  //< Exceptional or urgent condition
     IOAccept = 0x08,  //< Socket accept
     IOConnect = 0x10  //< Socket connect
   };

Function Documentation

IOSize edm::storage::IOSized ( IOOffset n )

inline

Safely convert IOOffset n into a IOSize quantity. If n is larger than what IOSize can hold, it is truncated to maximum value that can be held in IOSize.

Definition at line 37 of file IOTypes.h.

                                     {
     // If IOSize and IOOffset are the same size, largest positive value
     // is half of maximum IOSize.  Otherwise all bits of IOSize work.
     IOOffset largest = (sizeof(IOOffset) == sizeof(IOSize) ? ~IOSize(0) / 2 : ~IOSize(0));
     return IOSize(n > largest ? largest : n);
   }