(mongodb >=1.13.0)
The MongoDB\Driver\TopologyDescription class is a value object that represents a topology to which the driver is connected. Instances of this class are returned by MongoDB\Driver\Monitoring\TopologyChangedEvent methods.
MongoDB\Driver\TopologyDescription::TYPE_UNKNOWN
Unknown topology type, returned by MongoDB\Driver\TopologyDescription::getType().
MongoDB\Driver\TopologyDescription::TYPE_SINGLE
Single server (i.e. direct connection), returned by MongoDB\Driver\TopologyDescription::getType().
MongoDB\Driver\TopologyDescription::TYPE_SHARDED
Sharded cluster, returned by MongoDB\Driver\TopologyDescription::getType().
MongoDB\Driver\TopologyDescription::TYPE_REPLICA_SET_NO_PRIMARY
Replica set with no primary server, returned by MongoDB\Driver\TopologyDescription::getType().
MongoDB\Driver\TopologyDescription::TYPE_REPLICA_SET_WITH_PRIMARY
Replica set with a primary server, returned by MongoDB\Driver\TopologyDescription::getType().
MongoDB\Driver\TopologyDescription::TYPE_LOAD_BALANCED
Load balanced topology, returned by MongoDB\Driver\TopologyDescription::getType().