Notification method for opening the topology

# MongoDB\Driver\Monitoring\SDAMSubscriber::topologyOpening

(mongodb >=1.13.0)

MongoDB\Driver\Monitoring\SDAMSubscriber::topologyOpening — Notification method for opening the topology

### Description

abstract public MongoDB\Driver\Monitoring\SDAMSubscriber::topologyOpening(MongoDB\Driver\Monitoring\TopologyOpeningEvent `$event`): void

If the subscriber is registered, this method is called when the topology is opened.

> Note: Due to the driver's connection handling and persistence behavior, this event may not be observed if a MongoDB\Driver\Manager uses a previously persisted » libmongoc client.

### Parameters

`event` (MongoDB\Driver\Monitoring\TopologyOpeningEvent)

  An event object encapsulating information about the opened topology.

### Return Values

No value is returned.

### Errors/Exceptions

- Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.

### See Also

- MongoDB\Driver\Monitoring\TopologyOpeningEvent
- MongoDB\Driver\Monitoring\addSubscriber() - Registers a monitoring event subscriber globally
- MongoDB\Driver\Manager::addSubscriber() - Registers a monitoring event subscriber with this Manager

`↑` and `↓` to navigate • `Enter` to select • `Esc` to close • `/` to open