MongoDB\Client::addSubscriber()

1.18版本新增。

定义

MongoDB\Client::addSubscriber()

向此客户端注册监控事件订阅者。订阅者将收到有关该客户端的所有事件的通知。

function addSubscriber(MongoDB\Driver\Monitoring\Subscriber $subscriber): void

参数

$subscriber : MongoDB\驱动程序\监控\Subscriber: 向此客户端注册的监控事件订阅者。

错误/异常

MongoDB\Exception\InvalidArgumentException 用于与参数或选项解析相关的错误。

MongoDB\ 驱动程序\Exception\InvalidArgumentException 如果订阅者是 MongoDB\ 驱动程序\Monitoring\LogSubscriber ，因为记录器只能在 MongoDB\ 驱动程序\Monitoring\addSubscriber 全局注册。

行为

如果$subscriber已向此客户端注册，则此函数为空操作。如果$subscriber也已在全局注册，则该客户端的每个事件仍只会收到一次通知。

例子

创建用于记录所有事件的MongoDB\ 驱动程序\Monitoring\CommandSubscriber：

<?php
use MongoDB\Driver\Monitoring\CommandSubscriber;use MongoDB\Driver\Monitoring\CommandStartedEvent;use MongoDB\Driver\Monitoring\CommandSucceededEvent;use MongoDB\Driver\Monitoring\CommandFailedEvent;
class LogCommandSubscriber implements CommandSubscriber{    private $stream;    public function __construct($stream)    {        $this->stream = $stream;    }
    public function commandStarted(CommandStartedEvent $event): void    {        fwrite($this->stream, sprintf(            'Started command #%d "%s": %s%s',            $event->getRequestId(),            $event->getCommandName(),            Document::fromPHP($event->getCommand())->toCanonicalExtendedJSON(),            PHP_EOL,        ));    }
    public function commandSucceeded(CommandSucceededEvent $event): void    {        fwrite($this->stream, sprintf(            'Succeeded command #%d "%s" in %d microseconds: %s%s',            $event->getRequestId(),            $event->getCommandName(),            $event->getDurationMicros(),            json_encode($event->getReply()),            PHP_EOL,        ));    }
    public function commandFailed(CommandFailedEvent $event): void    {        fwrite($this->stream, sprintf(            'Failed command #%d "%s" in %d microseconds: %s%s',            $event->getRequestId(),            $event->getCommandName(),            $event->getDurationMicros(),            $event->getError()->getMessage(),            PHP_EOL,        ));    }}

然后，订阅者可以在客户端注册：

<?php
$client = new MongoDB\Client();$subscriber = new LogCommandSubscriber(STDERR);
$client->addSubscriber($subscriber);
$client->test->users->insertOne(['username' => 'alice']);

上述代码会将以下内容写入stderr 输出：

Started command #1 "insert": { "insert" : "users", "ordered" : true, "$db" : "test", "lsid" : { "id" : { "$binary" : { "base64" : "dKTBhZD7Qvi0vUhvR58mCA==", "subType" : "04" } } }, "documents" : [ { "username" : "alice", "_id" : { "$oid" : "655d1fca12e81018340a4fc2" } } ] }Succeeded command #1 "insert" in 876 microseconds: {"n":1,"ok":1}

另请参阅