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    The MongoDB\Driver\ReadPreference class

    (mongodb >=1.0.0)

    Einführung

    Klassenbeschreibung

    final class MongoDB\Driver\ReadPreference implements MongoDB\BSON\Serializable, Serializable {
    /* Konstanten */
    const int RP_PRIMARY = 1;
    const int RP_PRIMARY_PREFERRED = 5;
    const int RP_SECONDARY = 2;
    const int RP_SECONDARY_PREFERRED = 6;
    const int RP_NEAREST = 10;
    const string PRIMARY = primary;
    const string PRIMARY_PREFERRED = primaryPreferred;
    const string SECONDARY = secondary;
    const string SECONDARY_PREFERRED = secondaryPreferred;
    const string NEAREST = nearest;
    const int NO_MAX_STALENESS = -1;
    const int SMALLEST_MAX_STALENESS_SECONDS = 90;
    /* Methoden */
    final public bsonSerialize(): stdClass
    final public __construct(string|int $mode, ?array $tagSets = null, ?array $options = null)
    final public getHedge(): ?object
    final public getMaxStalenessSeconds(): int
    final public getMode(): int
    final public getModeString(): string
    final public getTagSets(): array
    final public serialize(): string
    final public unserialize(string $data): void
    }

    Vordefinierte Konstanten

    MongoDB\Driver\ReadPreference::RP_PRIMARY

    All operations read from the current replica set primary. This is the default read preference for MongoDB.

    MongoDB\Driver\ReadPreference::RP_PRIMARY_PREFERRED

    In most situations, operations read from the primary but if it is unavailable, operations read from secondary members.

    MongoDB\Driver\ReadPreference::RP_SECONDARY

    All operations read from the secondary members of the replica set.

    MongoDB\Driver\ReadPreference::RP_SECONDARY_PREFERRED

    In most situations, operations read from secondary members but if no secondary members are available, operations read from the primary.

    MongoDB\Driver\ReadPreference::RP_NEAREST

    Operations read from member of the replica set with the least network latency, irrespective of the member's type.

    MongoDB\Driver\ReadPreference::PRIMARY

    All operations read from the current replica set primary. This is the default read preference for MongoDB.

    MongoDB\Driver\ReadPreference::PRIMARY_PREFERRED

    In most situations, operations read from the primary but if it is unavailable, operations read from secondary members.

    MongoDB\Driver\ReadPreference::SECONDARY

    All operations read from the secondary members of the replica set.

    MongoDB\Driver\ReadPreference::SECONDARY_PREFERRED

    In most situations, operations read from secondary members but if no secondary members are available, operations read from the primary.

    MongoDB\Driver\ReadPreference::NEAREST

    Operations read from member of the replica set with the least network latency, irrespective of the member's type.

    MongoDB\Driver\ReadPreference::NO_MAX_STALENESS

    The default value for the "maxStalenessSeconds" option is to specify no limit on maximum staleness, which means that the driver will not consider a secondary's lag when choosing where to direct a read operation.

    MongoDB\Driver\ReadPreference::SMALLEST_MAX_STALENESS_SECONDS

    The minimum value for the "maxStalenessSeconds" option is 90 seconds. The driver estimates secondaries' staleness by periodically checking the latest write date of each replica set member. Since these checks are infrequent, the staleness estimate is coarse. Thus, the driver cannot enforce a max staleness value of less than 90 seconds.

    Changelog

    Version Beschreibung
    PECL mongodb 1.7.0

    Added the MongoDB\Driver\ReadPreference::PRIMARY, MongoDB\Driver\ReadPreference::PRIMARY_PREFERRED, MongoDB\Driver\ReadPreference::SECONDARY, MongoDB\Driver\ReadPreference::SECONDARY_PREFERRED, MongoDB\Driver\ReadPreference::NEAREST constants.

    Implements Serializable.

    PECL mongodb 1.2.0

    Added the MongoDB\Driver\ReadPreference::NO_MAX_STALENESS and MongoDB\Driver\ReadPreference::SMALLEST_MAX_STALENESS_SECONDS constants.

    Implements MongoDB\BSON\Serializable.

    Inhaltsverzeichnis

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