MongoDB\Driver\Server::getLatency
(mongodb >=1.0.0)
MongoDB\Driver\Server::getLatency — Returns the latency of this server in milliseconds
说明
Returns the latency of this server in milliseconds. This is the client's
measured
» round trip time
of a hello command.
参数
此函数没有参数。
返回值
Returns the latency of this server in milliseconds, or null if no latency
has been measured (e.g. client is connected to a load balancer).
错误／异常
- Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.
更新日志
| 版本 | 说明 |
|---|---|
| PECL mongodb 1.11.0 |
This method will return null if no latency has been measured. In
earlier versions, an integer was always returned and an unset value
might be reported as -1.
|
示例
示例 #1 MongoDB\Driver\Server::getLatency() example
<?php
$manager = new MongoDB\Driver\Manager("mongodb://localhost:27017/");
$rp = new MongoDB\Driver\ReadPreference(MongoDB\Driver\ReadPreference::RP_PRIMARY);
$server = $manager->selectServer($rp);
var_dump($server->getLatency());
?>以上示例的输出类似于：
int(592)
参见
- MongoDB\Driver\Server::getInfo() - Returns an array of information describing this server
- MongoDB\Driver\ServerDescription::getRoundTripTime() - Returns the server's round trip time in milliseconds
- » Server Discovery and Monitoring Specification
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