TAO_CosNotification
2.0.8
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A class that manages the details of persistent storage. More...
#include <Persistent_File_Allocator.h>
Public Member Functions | |
Persistent_File_Allocator () | |
The constructor. | |
~Persistent_File_Allocator () | |
The destructor. | |
bool | open (const ACE_TCHAR *filename, const size_t block_size=512) |
void | shutdown () |
Wait for pending I/O and terminate our work thread. | |
Persistent_Storage_Block * | allocate () |
Persistent_Storage_Block * | allocate_at (size_t block_number) |
Allocate a new Persistent_Storage_Block at a given address. | |
Persistent_Storage_Block * | allocate_nowrite () |
Allocate a PSB that is marked to not persist. | |
void | used (size_t block_number) |
Mark a block as used, removing it from the free list. | |
void | free (size_t block_number) |
Mark a block number as able to be used again. | |
size_t | block_size () const |
Access block size. | |
bool | read (Persistent_Storage_Block *psb) |
Read data into a PSB. | |
bool | write (Persistent_Storage_Block *psb) |
Write this block to the file,. | |
ACE_OFF_T | file_size () const |
for information (unit test) only. | |
Private Member Functions | |
void | free_block (const size_t block_number) |
Free a previously assigned block. | |
bool | allocate_block (size_t &block_number) |
Find and allocate a free block. | |
void | shutdown_thread () |
Wait for pending I/O to complete and shut our worker thread down safely. | |
void | run () |
The worker's execution thread. | |
Static Private Member Functions | |
static ACE_THR_FUNC_RETURN | thr_func (void *arg) |
Private Attributes | |
ACE_Thread_Manager | thread_manager_ |
Random_File | pstore_ |
Bit_Vector | free_blocks_ |
ACE_Unbounded_Queue < Persistent_Storage_Block * > | block_queue_ |
TAO_SYNCH_MUTEX | lock_ |
TAO_SYNCH_MUTEX | free_blocks_lock_ |
TAO_SYNCH_MUTEX | queue_lock_ |
bool | terminate_thread_ |
bool | thread_active_ |
ACE_SYNCH_CONDITION | wake_up_thread_ |
A class that manages the details of persistent storage.
Maintains a free list, write queue, allocations of new blocks, reads, and writes. This class also manages a thread that performs background updating of a Random_File.
this is too much for one class to do. It should be refactored.
we shouldn't arbitrarily use a thread.
TAO_Notify::Persistent_File_Allocator::Persistent_File_Allocator | ( | ) |
The constructor.
TAO_Notify::Persistent_File_Allocator::~Persistent_File_Allocator | ( | ) |
The destructor.
Persistent_Storage_Block * TAO_Notify::Persistent_File_Allocator::allocate | ( | ) |
Allocate a new Persistent_Storage_Block and initialize it to an unused block of storage.
Persistent_Storage_Block * TAO_Notify::Persistent_File_Allocator::allocate_at | ( | size_t | block_number | ) |
Allocate a new Persistent_Storage_Block at a given address.
bool TAO_Notify::Persistent_File_Allocator::allocate_block | ( | size_t & | block_number | ) | [private] |
Find and allocate a free block.
Persistent_Storage_Block * TAO_Notify::Persistent_File_Allocator::allocate_nowrite | ( | ) |
Allocate a PSB that is marked to not persist.
size_t TAO_Notify::Persistent_File_Allocator::block_size | ( | ) | const |
Access block size.
ACE_OFF_T TAO_Notify::Persistent_File_Allocator::file_size | ( | ) | const |
for information (unit test) only.
void TAO_Notify::Persistent_File_Allocator::free | ( | size_t | block_number | ) |
Mark a block number as able to be used again.
void TAO_Notify::Persistent_File_Allocator::free_block | ( | const size_t | block_number | ) | [private] |
Free a previously assigned block.
bool TAO_Notify::Persistent_File_Allocator::open | ( | const ACE_TCHAR * | filename, |
const size_t | block_size = 512 |
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bool TAO_Notify::Persistent_File_Allocator::read | ( | Persistent_Storage_Block * | psb | ) |
Read data into a PSB.
Data will come either from the queue of blocks to be written, or it will be read from the file if there are no queued write requests for this block.
void TAO_Notify::Persistent_File_Allocator::run | ( | ) | [private] |
The worker's execution thread.
void TAO_Notify::Persistent_File_Allocator::shutdown | ( | ) |
Wait for pending I/O and terminate our work thread.
void TAO_Notify::Persistent_File_Allocator::shutdown_thread | ( | ) | [private] |
Wait for pending I/O to complete and shut our worker thread down safely.
ACE_THR_FUNC_RETURN TAO_Notify::Persistent_File_Allocator::thr_func | ( | void * | arg | ) | [static, private] |
Used during thread startup to cast us back to ourselves and call the run() method.
void TAO_Notify::Persistent_File_Allocator::used | ( | size_t | block_number | ) |
Mark a block as used, removing it from the free list.
bool TAO_Notify::Persistent_File_Allocator::write | ( | Persistent_Storage_Block * | psb | ) |
Write this block to the file,.
Add the Persistent_Storage_Block to our write queue and let the worker thread handle writing this to the Random_File.
ACE_Unbounded_Queue<Persistent_Storage_Block*> TAO_Notify::Persistent_File_Allocator::block_queue_ [private] |
bool TAO_Notify::Persistent_File_Allocator::terminate_thread_ [private] |
bool TAO_Notify::Persistent_File_Allocator::thread_active_ [private] |