Implementation of file based on other files, dynamically allocate one file per block. Allows for dynamic disk space consumption.
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#include <fileperblock_file.h>
List of all members.
Public Member Functions |
| fileperblock_file (const std::string &filename_prefix, int mode, int queue_id=DEFAULT_QUEUE, int allocator_id=NO_ALLOCATOR) |
| constructs file object
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virtual void | serve (const request *req) throw (io_error) |
virtual void | set_size (offset_type new_size) |
| Changes the size of the file.
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virtual offset_type | size () |
| Returns size of the file.
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virtual void | lock () |
| Locks file for reading and writing (acquires a lock in the file system)
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virtual void | discard (offset_type offset, offset_type length) |
| Frees the specified region. Actually deletes the corresponding file if the whole thing is deleted.
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virtual void | export_files (offset_type offset, offset_type length, std::string filename) |
| Rename the file corresponding to the offset such that it is out of reach for deleting.
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const char * | io_type () const |
| Identifies the type of I/O implementation.
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| disk_queued_file (int queue_id, int allocator_id) |
request_ptr | aread (void *buffer, offset_type pos, size_type bytes, const completion_handler &on_cmpl) |
| Schedules an asynchronous read request to the file.
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request_ptr | awrite (void *buffer, offset_type pos, size_type bytes, const completion_handler &on_cmpl) |
| Schedules an asynchronous write request to the file.
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virtual int | get_queue_id () const |
| Returns the identifier of the file's queue.
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virtual int | get_allocator_id () const |
| Returns the file's allocator.
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void | add_request_ref () |
void | delete_request_ref () |
int | get_request_nref () |
virtual int | get_physical_device_id () const |
virtual void | remove () |
Protected Member Functions |
std::string | filename_for_block (unsigned_type offset) |
| Constructs a file name for a given block.
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Detailed Description
template<class base_file_type>
class fileperblock_file< base_file_type >
Implementation of file based on other files, dynamically allocate one file per block. Allows for dynamic disk space consumption.
Constructor & Destructor Documentation
template<class base_file_type >
__STXXL_BEGIN_NAMESPACE fileperblock_file< base_file_type >::fileperblock_file |
( |
const std::string & |
filename_prefix, |
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int |
mode, |
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int |
queue_id = DEFAULT_QUEUE , |
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int |
allocator_id = NO_ALLOCATOR |
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) |
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constructs file object
- Parameters:
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filename_prefix | filename prefix, numbering will be appended to it |
mode | open mode, see file::open_modes |
disk | disk(file) identifier |
Member Function Documentation
template<class base_file_type >
void fileperblock_file< base_file_type >::discard |
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offset_type |
offset, |
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offset_type |
length |
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) |
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virtual |
Frees the specified region. Actually deletes the corresponding file if the whole thing is deleted.
Reimplemented from file.
template<class base_file_type >
void fileperblock_file< base_file_type >::export_files |
( |
offset_type |
offset, |
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offset_type |
length, |
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std::string |
filename |
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) |
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virtual |
Rename the file corresponding to the offset such that it is out of reach for deleting.
Reimplemented from file.
template<class base_file_type >
std::string fileperblock_file< base_file_type >::filename_for_block |
( |
unsigned_type |
offset | ) |
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protected |
Constructs a file name for a given block.
template<class base_file_type >
Identifies the type of I/O implementation.
- Returns:
- pointer to null terminated string of characters, containing the name of I/O implementation
Reimplemented from file.
template<class base_file_type >
template<class base_file_type>
Changes the size of the file.
- Parameters:
-
new_size | value of the new file size |
Implements file.
template<class base_file_type>
Returns size of the file.
- Returns:
- file size in length
Implements file.
The documentation for this class was generated from the following files: