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<?php
final class Freezer
{
protected $key_delimeter = '%%%';
private $length = 99999;
private $nodes_location = '';
private $nodes = array();
public static function clean($directory, $suffix) {
$loc = $directory . '/' . $suffix;
file_exists($loc) && unlink($loc);
}
public function __construct($directory, $suffix) {
$this->nodes_location = $directory . '/' . $suffix;
touch($this->nodes_location);
$nodes_file = fopen($this->nodes_location, 'r');
$this->_readFromFile($nodes_file);
fclose($nodes_file);
}
public function __destruct() {
$this->flush();
}
private function _readFromFile($nodes_file) {
while (!feof($nodes_file)) {
$line = stream_get_line($nodes_file, $this->length, "\n");
list($key, $value) = explode($this->key_delimeter, $line);
if (trim($key)) {
$this->nodes[$key] = $value;
}
}
}
public function ids($flush = TRUE) {
return array_keys($this->nodes);
}
public function open($key, $default) {
if(array_key_exists($key, $this->nodes)){
return unserialize(str_replace("\\n", "\n", $this->nodes[$key]));
}
return $default;
}
public function save($key, $content) {
$this->nodes[$key] = str_replace("\n", "\\n", serialize($content));
}
private function flush() {
$tmp = fopen($this->nodes_location . '_tmp', 'w');
foreach ($this->nodes as $key => $value) {
fwrite($tmp, $key . $this->key_delimeter . $value . "\n");
}
fclose($tmp);
unlink($this->nodes_location);
rename($this->nodes_location . '_tmp', $this->nodes_location);
}
}
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