Notification method for a topology description change

# MongoDB\Driver\Monitoring\SDAMSubscriber::topologyChanged

(mongodb >=1.13.0)

MongoDB\Driver\Monitoring\SDAMSubscriber::topologyChanged — Notification method for a topology description change

### Description

abstract public MongoDB\Driver\Monitoring\SDAMSubscriber::topologyChanged(MongoDB\Driver\Monitoring\TopologyChangedEvent `$event`): void

If the subscriber is registered, this method is called when the topology's description changes. For example, a topology discovering a new replica set primary would cause its topology description to change.

### Parameters

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

  An event object encapsulating information about the changed topology description.

### Return Values

No value is returned.

### Errors/Exceptions

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

### See Also

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

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