class sssd_engine::SmartSSDCache¶

#include "smart_ssd_cache.hpp"

Overview¶

class to handle a specific SSD device

int getCardNum ()

get number of cards

Returns:

number of cards

SmartSSDCache (
    const char* xclbin_path,
    int card_num,
    sssd_info_t* disks,
    FILE* log
    )

default constructor, instantiate data engine

Parameters:

xclbin_path	path of xclbin
card_num	number of availabe SmartSSD cards
disks	information of the SSDs
log	file handler for dumping the logs

~SmartSSDCache ()

default deconstructor

ErrorCode addFile (
    std::unique_ptr <char[]> data,
    size_t size,
    const std::string& filename
    )

store file to managed SmartSSD cards. Copy data from CPU memory to SSD cards

Parameters:

data	pointer to file content in memory. Before return, the block of storage will be released
size	file size
filename	file to store

Returns:

success or fail status

char* scanFile (
    const char* fname,
    sssd_scandesc_t* sd,
    ErrorCode& err
    )

scan files from managed SmartSSD cards.

Parameters:

fname	file name;
sd	pointer to configuration including schema, projection and filter conditions filenames.
err	return the status of exectution.

Returns:

pointer the selected row. It is stored in format defined by data type in schema.

ErrorCode listFiles (
    const char* path_pattern,
    std::vector <std::string>& file_list
    )

list all the file name that matche the path_pattern

Parameters:

path_pattern	specify the path_pattern for regex
file_list	store the file name that matched the path_pattern

Returns:

fail/success

void print_input (const sssd_scandesc_t* sd)

print input information

Parameters:

sd	the input schema

void print_output (
    const int64_t value [],
    const bool isnull [],
    int32_t hash,
    const sssd_scandesc_t* sd
    )

print output information

Parameters:

void release (
    const char* file_path,
    char* buf_ptr
    )

release specified buffer

Parameters:

file_path	path to the file
buf_ptr	buffer to be released