public static function get_db_host_roll($db_read_host_array, $db)
{
$key = md5(implode("_", array_keys($db_read_host_array) . implode(array_values($db_read_host_array))));
$cache_array = cls_shmop::readArray($key);
if ($cache_array) {
$host = array_shift($cache_array);
cls_shmop::writeArray($key, $cache_array);
} else {
$host_str = $db_read_host_array[$db];
if ($host_str) {
$host_array = explode(',', $host_str);
$read_host_list = self::get_read_host_list($host_array);
$host = array_shift($read_host_list);
cls_shmop::writeArray($key, $read_host_list);
} else {
$host = '';
}
}
return $host;
}
private function initNodeList()
{
$str = $this->getConsistentHashSeparateString();
if ($str) {
$str = strtolower($str);
$list = explode(';', $str);
if (!empty($list)) {
$max = 0;
$i = 0;
$nodeList = array();
foreach ($list as $value) {
$one_db_config = explode('=', $value);
$one_db_config[0] = str_replace('[', '', $one_db_config[0]);
$one_db_config[0] = str_replace(']', '', $one_db_config[0]);
$start_end_list = explode(',', $one_db_config[0]);
if ($max <= $start_end_list[1]) {
$max = $start_end_list[1];
}
$node = new Node();
$node->setStart(str_replace('w', '0000', $start_end_list[0]));
$node->setEnd(str_replace('w', '0000', $start_end_list[1]));
$node->setDbName($one_db_config[1]);
if ($i == 0 && !parent::getConsistentHashOneDbOneTable()) {
$node->setIsDefaultDb(true);
}
$i++;
$nodeList[] = $node;
}
$this->node_list = $nodeList;
cls_shmop::writeArray(self::INIT_CONSISTENT_HASH_SECTION_CACHE_KEY . parent::getLogicTable(), $nodeList);
}
}
/*if($max !=$this->consistent_hash_separate_mod_max_value){
throw new DBRouteException('一致性hash字符串设置错误');
}*/
}
public function nextValue($logic_table)
{
$file = fopen(ROOT_PATH . 'includes/cls/' . $logic_table . '_seq.txt', "w+");
if (flock($file, LOCK_EX)) {
//独占锁
$value = 0;
$is_write = false;
for (;;) {
$new_array = cls_shmop::readArray($logic_table);
if ($new_array) {
$start = $new_array['start'];
$end = $new_array['end'];
$value = $start;
if ($start < $end) {
$new_array['start'] = $start + 1;
} else {
$new_array = array();
}
$is_write = cls_shmop::writeArray($logic_table, $new_array);
} else {
$range = $this->getLastSeq($logic_table);
if ($range) {
$min = $range->getMin();
$max = $range->getMax();
$array = array();
$array['start'] = $min + 1;
$array['end'] = $max;
$value = $min;
$is_write = cls_shmop::writeArray($logic_table, $array);
}
}
if ($is_write && $value) {
break;
}
}
flock($file, LOCK_UN);
}
fclose($file);
return $value;
}
