Package com.mongodb

Class ReadConcern


  • public final class ReadConcern
extends Object
    A read concern allows clients to choose a level of isolation for their reads.
    Since:
    3.2
    MongoDB documentation
    Read Concern
    Since server release
    3.2

    • Field Detail

      • DEFAULT

        public static final ReadConcern DEFAULT
        Use the servers default read concern.

      • LOCAL

        public static final ReadConcern LOCAL
        The local read concern.

      • MAJORITY

        public static final ReadConcern MAJORITY
        The majority read concern.

      • LINEARIZABLE

        public static final ReadConcern LINEARIZABLE
        The linearizable read concern.

        This read concern is only compatible with ReadPreference.primary().

        Since:
        3.4
        Since server release
        3.4

      • SNAPSHOT

        public static final ReadConcern SNAPSHOT
        The snapshot read concern.
        Since:
        3.8
        Since server release
        4.0

      • AVAILABLE

        public static final ReadConcern AVAILABLE
        The available read concern.
        Since:
        3.9
        Since server release
        3.6

    • Constructor Detail

      • ReadConcern

        public ReadConcern​(ReadConcernLevel level)
        Construct a new read concern
        Parameters:
        level - the read concern level

    • Method Detail

      • getLevel

        @Nullable
public ReadConcernLevel getLevel​()
        Gets the read concern level.
        Returns:
        the read concern level, which may be null (which indicates to use the server's default level)
        Since:
        3.6

      • isServerDefault

        public boolean isServerDefault​()
        Returns:
        true if this is the server default read concern

      • asDocument

        public BsonDocument asDocument​()
        Gets this read concern as a document.
        Returns:
        The read concern as a BsonDocument

      • hashCode

        public int hashCode​()
        Overrides:
        hashCode in class Object