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binary db (8x smaller)

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This commit is contained in:
Denis Ryabov 2014-07-23 10:49:39 +04:00
parent 528edd3bfd
commit d957239a1b
3 changed files with 43 additions and 32 deletions
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4
habr_twister.php
View File

@ -16,8 +16,8 @@ $twister = new TwisterPost('habr_ru'); // set user name
$twister->twisterPath = '.' . DIRECTORY_SEPARATOR . 'twister-win32-bundle' . DIRECTORY_SEPARATOR;
// Initialise RSS database
require_once 'habrrssdb.php';
$db = new HabrRSSDb('habr_db.dat');
require_once 'rssdb.php';
$db = new RSSDb('habr_ru.dat');
foreach ($rss->channel->item as $item) {
$link = (string)$item->link;

30
habrrssdb.php
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@ -1,30 +0,0 @@
<?php
class HabrRSSDb
{
protected $hDatabase = null;
public function __construct($dbFile)
{
fclose(fopen($dbFile, 'a')); // create file if not exists
$this->hDatabase = fopen($dbFile, 'r+');
}
public function __destruct()
{
fclose($this->hDatabase);
}
public function isPublished($id)
{
fseek($this->hDatabase, $id);
$status = fgetc($this->hDatabase);
return $status === '1';
}
public function setPublished($id)
{
fseek($this->hDatabase, $id);
fwrite($this->hDatabase, '1');
}
}

41
rssdb.php Normal file
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@ -0,0 +1,41 @@
<?php
class RSSDb
{
protected $hDatabase = null;
protected $minId = 0;
protected $bits = array(0=>1, 2, 4, 8, 16, 32, 64, 128);
public function __construct($dbFile, $minId = 0)
{
fclose(fopen($dbFile, 'a')); // create file if not exists
$this->hDatabase = fopen($dbFile, 'r+');
$this->minId = $minId;
}
public function __destruct()
{
fclose($this->hDatabase);
}
public function isPublished($id)
{
$id -= $this->minId;
if ($id < 0) return true;
$pos = intval($id/8);
fseek($this->hDatabase, $pos);
$status = ord(fgetc($this->hDatabase));
return (bool)($status & $this->bits[$id % 8]);
}
public function setPublished($id)
{
$id -= $this->minId;
if ($id < 0) return;
$pos = intval($id/8);
fseek($this->hDatabase, $pos);
$status = ord(fgetc($this->hDatabase));
fseek($this->hDatabase, $pos);
fwrite($this->hDatabase, chr($status | $this->bits[$id % 8]));
}
}