Package com.mongodb

Class ReadConcern

java.lang.Object

com.mongodb.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 Summary

Fields

Modifier and Type	Field	Description
static ReadConcern	DEFAULT	Use the servers default read concern.
static ReadConcern	LINEARIZABLE	The linearizable read concern.
static ReadConcern	LOCAL	The local read concern.
static ReadConcern	MAJORITY	The majority read concern.
static ReadConcern	SNAPSHOT	The snapshot read concern.

Constructor Summary

Constructors

Constructor	Description
ReadConcern(ReadConcernLevel level)	Construct a new read concern

Method Summary

Modifier and Type	Method	Description
BsonDocument	asDocument()	Gets this read concern as a document.
boolean	equals(Object o)
ReadConcernLevel	getLevel()	Gets the read concern level.
int	hashCode()
boolean	isServerDefault()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

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

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

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object