a DiskList implementation for EOS More...

#include <DiskListEOS.h>

Inheritance diagram for SH::DiskListEOS:

Collaboration diagram for SH::DiskListEOS:

Public Member Functions
void	testInvariant () const
	test the invariant of this object More...

	DiskListEOS (const std::string &val_dir)
	make the listing for the given directory More...

	DiskListEOS (const std::string &val_dir, const std::string &val_prefix)
	make the listing for the given directory, but replacing the directory with prefix for the path More...

bool	next ()
	get the next list entry More...

std::string	path () const
	the path for the current entry. More...

std::string	fileName () const
	the filename for the current entry More...

DiskList *	openDir () const
	make a new list object for the sub-directory More...

std::string	dirname () const
	the base path for the directory listed More...

Protected Member Functions
virtual bool	getNext ()
	get the next list entry More...

virtual std::string	getPath () const
	the path for the current entry. More...

virtual DiskList *	doOpenDir () const
	make a new list object for the sub-directory More...

virtual std::string	getDirname () const
	the base path for the directory listed More...

Private Types
enum	State { S_BLANK, S_VALID, S_DONE, S_BROKEN }
	the current state More...

Private Attributes
std::string	m_dir
	the directory we are reading More...

std::string	m_prefix
	the directory from with to read actual files More...

std::string	m_list
	the result of the directory listing More...

std::string	m_file
	the last file we read More...

bool	m_isDir
	whether this is a directory More...

bool	m_isRead
	whether the directory has been read More...

State	m_state
	the current state More...

Detailed Description

a DiskList implementation for EOS

Definition at line 25 of file DiskListEOS.h.

Member Enumeration Documentation

◆ State

enum SH::DiskList::State

privateinherited

the current state

Enumerator
S_BLANK	just initialized
S_VALID	holding a valid entry
S_DONE	finished reading entries
S_BROKEN	an error occured

Definition at line 166 of file DiskList.h.

     {
       S_BLANK,  
       S_VALID,  
       S_DONE,   
       S_BROKEN  
     };

Constructor & Destructor Documentation

◆ DiskListEOS() [1/2]

SH::DiskListEOS::DiskListEOS ( const std::string & val_dir )

make the listing for the given directory

Parameters

val_dir the directory to list

Guarantee: strong

Failures: out of memory II

Definition at line 41 of file DiskListEOS.cxx.

     : m_dir (val_dir), m_prefix ("root://eosatlas.cern.ch/" + val_dir), m_isRead (false)
   {
     RCU_NEW_INVARIANT (this);
   }

◆ DiskListEOS() [2/2]

SH::DiskListEOS::DiskListEOS	(	const std::string &	val_dir,
		const std::string &	val_prefix
	)

make the listing for the given directory, but replacing the directory with prefix for the path

Parameters

val_dir	the directory to list
val_prefix	the prefix with which val_dir will be replaced in the reported paths

Guarantee: strong

Failures: out of memory II

Rationale: this mechanism is meant to allow scanning file servers using one protocol, but then accessing them using another

Definition at line 50 of file DiskListEOS.cxx.

     : m_dir (val_dir), m_prefix (val_prefix), m_isRead (false)
   {
     RCU_NEW_INVARIANT (this);
   }

Member Function Documentation

◆ dirname()

std::string SH::DiskList::dirname ( ) const

inherited

the base path for the directory listed

Guarantee: strong

Failures: out of memory II

Definition at line 110 of file DiskList.cxx.

   {
     RCU_READ_INVARIANT (this);
     return getDirname ();
   }

◆ doOpenDir()

DiskList * SH::DiskListEOS::doOpenDir ( ) const

protectedvirtual

make a new list object for the sub-directory

Returns: a new list object for the sub-directory, or NULL if it is not a directory

Precondition: (soft) next() has been called successfully

Guarantee: strong

Failures: out of memory III

Rationale: the virtual part of DiskList::openDir()

Implements SH::DiskList.

Definition at line 111 of file DiskListEOS.cxx.

   {
     RCU_READ_INVARIANT (this);
  
     if (m_file.empty() || !m_isDir)
       return 0;
  
     return new DiskListEOS (m_dir + "/" + m_file, m_prefix + "/" + m_file);
   }

◆ fileName()

std::string SH::DiskList::fileName ( ) const

inherited

the filename for the current entry

Returns: the filename for the current entry

Precondition: (soft) next() has been called successfully

Guarantee: strong

Failures: out of memory III

Definition at line 87 of file DiskList.cxx.

   {
     // no invariant used
     std::string result = path();
     std::string::size_type split = result.rfind ('/');
     if (split != std::string::npos)
       result = result.substr (split + 1);
     return result;
   }

◆ getDirname()

std::string SH::DiskListEOS::getDirname ( ) const

protectedvirtual

the base path for the directory listed

Guarantee: strong

Failures: out of memory II

Rationale: the virtual part of DiskList::dirname()

Implements SH::DiskList.

Definition at line 124 of file DiskListEOS.cxx.

   {
     RCU_READ_INVARIANT (this);
     return m_dir;
   }

◆ getNext()

bool SH::DiskListEOS::getNext ( )

protectedvirtual

get the next list entry

Returns: whether we found another entry

Guarantee: basic

Failures: i/o errors

Rationale: the virtual part of DiskList::next()

Implements SH::DiskList.

Definition at line 59 of file DiskListEOS.cxx.

   {
     RCU_CHANGE_INVARIANT (this);
  
     if (!m_isRead)
     {
       m_list = RCU::Shell::exec_read ("eos ls -l " + m_dir);
       m_isRead = true;
     }
  
     while (!m_list.empty())
     {
       std::string::size_type split1 = m_list.find ('\n');
       if (split1 == std::string::npos)
     return false;
  
       std::string line (m_list.substr (0, split1));
       m_list = m_list.substr (split1 + 1);
  
       // rationale: this should handle it correctly if there is a
       //   formatting escape sequence at the beginning of the line.
       std::string::size_type split2 = line.find ("r");
       m_isDir = line[split2-1] == 'd';
       line = line.substr (split2);
  
       std::istringstream str (line);
       std::string fields [9];
       for (unsigned iter = 0, end = 9; iter != end; ++ iter)
       {
     if (!(str >> fields[iter]))
       RCU_THROW_MSG ("failed to parse line: " + line);
       }
       if (fields[0].empty())
       RCU_THROW_MSG ("failed to parse line: " + line);
       m_file = fields[8];
       return true;
     }
     return false;
   }

◆ getPath()

std::string SH::DiskListEOS::getPath ( ) const

protectedvirtual

the path for the current entry.

Returns: the path for the current entry

Precondition: (soft) next() has been called successfully

Guarantee: strong failures: out of memory III

Rationale: the virtual part of DiskList::path()

Implements SH::DiskList.

Definition at line 102 of file DiskListEOS.cxx.

   {
     RCU_READ_INVARIANT (this);
     return m_prefix + "/" + m_file;
   }

◆ next()

bool SH::DiskList::next ( )

inherited

get the next list entry

Returns: whether we found another entry

Guarantee: basic

Failures: i/o errors

Definition at line 53 of file DiskList.cxx.

   {
     RCU_CHANGE_INVARIANT (this);
     switch (m_state)
     {
     case S_BLANK:
     case S_VALID:
       m_state = S_BROKEN;
       if (getNext())
     m_state = S_VALID;
       else
     m_state = S_DONE;
       return m_state == S_VALID;
     case S_DONE:
       RCU_THROW_MSG ("already finished processing list");
     case S_BROKEN:
       RCU_THROW_MSG ("list is in error state");
     };
     return false; // compiler dummy
   }

◆ openDir()

DiskList * SH::DiskList::openDir ( ) const

inherited

make a new list object for the sub-directory

Returns: a new list object for the sub-directory, or NULL if it is not a directory

Precondition: (soft) next() has been called successfully

Guarantee: strong

Failures: out of memory III

Definition at line 100 of file DiskList.cxx.

   {
     RCU_READ_INVARIANT (this);
     RCU_REQUIRE2_SOFT (m_state == S_VALID, "getNext() has not been called successfully");
     return doOpenDir();
   }

◆ path()

std::string SH::DiskList::path ( ) const

inherited

the path for the current entry.

Returns: the path for the current entry

Precondition: (soft) next() has been called successfully

Guarantee: strong failures: out of memory III

Definition at line 77 of file DiskList.cxx.

   {
     RCU_READ_INVARIANT (this);
     RCU_REQUIRE2_SOFT (m_state == S_VALID, "getNext() has not been called successfully");
     return getPath();
   }

◆ testInvariant()

void SH::DiskListEOS::testInvariant ( ) const

test the invariant of this object

Guarantee: no-fail

Definition at line 34 of file DiskListEOS.cxx.

36 {

37 }

Member Data Documentation

◆ m_dir

std::string SH::DiskListEOS::m_dir

private

the directory we are reading

Definition at line 100 of file DiskListEOS.h.

◆ m_file

std::string SH::DiskListEOS::m_file

private

the last file we read

Definition at line 112 of file DiskListEOS.h.

◆ m_isDir

bool SH::DiskListEOS::m_isDir

private

whether this is a directory

Definition at line 116 of file DiskListEOS.h.

◆ m_isRead

bool SH::DiskListEOS::m_isRead

private

whether the directory has been read

Definition at line 120 of file DiskListEOS.h.

◆ m_list

std::string SH::DiskListEOS::m_list

private

the result of the directory listing

Definition at line 108 of file DiskListEOS.h.

◆ m_prefix

std::string SH::DiskListEOS::m_prefix

private

the directory from with to read actual files

Definition at line 104 of file DiskListEOS.h.

◆ m_state

State SH::DiskList::m_state

privateinherited

the current state

Definition at line 174 of file DiskList.h.

The documentation for this class was generated from the following files:

Public Member Functions

Protected Member Functions

Private Types

Private Attributes

Detailed Description

Member Enumeration Documentation

◆ State

Constructor & Destructor Documentation

◆ DiskListEOS() [1/2]

◆ DiskListEOS() [2/2]

Member Function Documentation

◆ dirname()

◆ doOpenDir()

◆ fileName()

◆ getDirname()

◆ getNext()

◆ getPath()

◆ next()

◆ openDir()

◆ path()

◆ testInvariant()

Member Data Documentation

◆ m_dir

◆ m_file

◆ m_isDir

◆ m_isRead

◆ m_list

◆ m_prefix

◆ m_state