public function Init()
{
$this->hash = new ConsistentHash();
$this->MasterOrSlave = $ShmList = ShmConfig::getCacheAvailableAddress($this->config);
//从内存中获得可用列表
$list = array();
if (empty($ShmList)) {
//内存中没有，可能ping脚本没启,直接用配置
foreach ($this->config['nodes'] as $node) {
$list[] = $node['master'];
}
} else {
foreach ($ShmList as $node) {
//false已过滤,主/从在逻辑上都hash主的值
$list[] = $node['master']['target'];
}
}
$this->hash->addTargets($list);
//传入逻辑结点列表
}
