晋太元中,武陵人捕鱼为业。缘溪行,忘路之远近。忽逢桃花林,夹岸数百步,中无杂树,芳草鲜美,落英缤纷。渔人甚异之,复前行,欲穷其林。 林尽水源,便得一山,山有小口,仿佛若有光。便舍船,从口入。初极狭,才通人。复行数十步,豁然开朗。土地平旷,屋舍俨然,有良田、美池、桑竹之属。阡陌交通,鸡犬相闻。其中往来种作,男女衣着,悉如外人。黄发垂髫,并怡然自乐。 见渔人,乃大惊,问所从来。具答之。便要还家,设酒杀鸡作食。村中闻有此人,咸来问讯。自云先世避秦时乱,率妻子邑人来此绝境,不复出焉,遂与外人间隔。问今是何世,乃不知有汉,无论魏晋。此人一一为具言所闻,皆叹惋。余人各复延至其家,皆出酒食。停数日,辞去。此中人语云:“不足为外人道也。”(间隔 一作:隔绝) 既出,得其船,便扶向路,处处志之。及郡下,诣太守,说如此。太守即遣人随其往,寻向所志,遂迷,不复得路。 南阳刘子骥,高尚士也,闻之,欣然规往。未果,寻病终。后遂无问津者。
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<?php
namespace Aws\EndpointDiscovery;
class EndpointList
{
private $active;
private $expired = [];
public function __construct(array $endpoints)
{
$this->active = $endpoints;
reset($this->active);
}
/**
* Gets an active (unexpired) endpoint. Returns null if none found.
*
* @return null|string
*/
public function getActive()
{
if (count($this->active) < 1) {
return null;
}
while (time() > current($this->active)) {
$key = key($this->active);
$this->expired[$key] = current($this->active);
$this->increment($this->active);
unset($this->active[$key]);
if (count($this->active) < 1) {
return null;
}
}
$active = key($this->active);
$this->increment($this->active);
return $active;
}
/**
* Gets an active endpoint if possible, then an expired endpoint if possible.
* Returns null if no endpoints found.
*
* @return null|string
*/
public function getEndpoint()
{
if (!empty($active = $this->getActive())) {
return $active;
}
return $this->getExpired();
}
/**
* Removes an endpoint from both lists.
*
* @param string $key
*/
public function remove($key)
{
unset($this->active[$key]);
unset($this->expired[$key]);
}
/**
* Get an expired endpoint. Returns null if none found.
*
* @return null|string
*/
private function getExpired()
{
if (count($this->expired) < 1) {
return null;
}
$expired = key($this->expired);
$this->increment($this->expired);
return $expired;
}
private function increment(&$array)
{
if (next($array) === false) {
reset($array);
}
}
}