Package com.mongodb.client

Interface MongoClient

@Immutable
public interface MongoClient

A client-side representation of a MongoDB cluster. Instances can represent either a standalone MongoDB instance, a replica set, or a sharded cluster. Instance of this class are responsible for maintaining an up-to-date state of the cluster, and possibly cache resources related to this, including background threads for monitoring, and connection pools.

Instances of this class serve as factories for MongoDatabase instances.

Instances of this class can be created via the MongoClients factory.

Since:

3.7

See Also:

MongoClients

Method Summary

Modifier and Type	Method	Description
void	close()	Close the client, which will close all underlying cached resources, including, for example, sockets and background monitoring threads.
MongoDatabase	getDatabase(String databaseName)	Gets a MongoDatabase instance for the given database name.
MongoIterable<String>	listDatabaseNames()	Get a list of the database names
MongoIterable<String>	listDatabaseNames(ClientSession clientSession)	Get a list of the database names
ListDatabasesIterable<Document>	listDatabases()	Gets the list of databases
ListDatabasesIterable<Document>	listDatabases(ClientSession clientSession)	Gets the list of databases
<TResult> ListDatabasesIterable<TResult>	listDatabases(ClientSession clientSession, Class<TResult> resultClass)	Gets the list of databases
<TResult> ListDatabasesIterable<TResult>	listDatabases(Class<TResult> resultClass)	Gets the list of databases
ClientSession	startSession()	Creates a client session with default options.
ClientSession	startSession(ClientSessionOptions options)	Creates a client session.
ChangeStreamIterable<Document>	watch()	Creates a change stream for this client.
ChangeStreamIterable<Document>	watch(ClientSession clientSession)	Creates a change stream for this client.
<TResult> ChangeStreamIterable<TResult>	watch(ClientSession clientSession, Class<TResult> resultClass)	Creates a change stream for this client.
ChangeStreamIterable<Document>	watch(ClientSession clientSession, List<? extends Bson> pipeline)	Creates a change stream for this client.
<TResult> ChangeStreamIterable<TResult>	watch(ClientSession clientSession, List<? extends Bson> pipeline, Class<TResult> resultClass)	Creates a change stream for this client.
<TResult> ChangeStreamIterable<TResult>	watch(Class<TResult> resultClass)	Creates a change stream for this client.
ChangeStreamIterable<Document>	watch(List<? extends Bson> pipeline)	Creates a change stream for this client.
<TResult> ChangeStreamIterable<TResult>	watch(List<? extends Bson> pipeline, Class<TResult> resultClass)	Creates a change stream for this client.

Method Detail

getDatabase

MongoDatabase getDatabase(String databaseName)

Gets a MongoDatabase instance for the given database name.

Parameters:

databaseName - the name of the database to retrieve

Returns:

a MongoDatabase representing the specified database

Throws:

IllegalArgumentException - if databaseName is invalid

See Also:

MongoNamespace.checkDatabaseNameValidity(String)

startSession

ClientSession startSession()

Creates a client session with default options.

Note: A ClientSession instance can not be used concurrently in multiple operations.

Returns:

the client session

Since server release

3.6

startSession

ClientSession startSession(ClientSessionOptions options)

Creates a client session.

Note: A ClientSession instance can not be used concurrently in multiple operations.

Parameters:

options - the options for the client session

Returns:

the client session

Since server release

3.6

close

void close()

Close the client, which will close all underlying cached resources, including, for example, sockets and background monitoring threads.

listDatabaseNames

MongoIterable<String> listDatabaseNames()

Get a list of the database names

Returns:

an iterable containing all the names of all the databases

MongoDB documentation

List Databases

listDatabaseNames

MongoIterable<String> listDatabaseNames(ClientSession clientSession)

Get a list of the database names

Parameters:

clientSession - the client session with which to associate this operation

Returns:

an iterable containing all the names of all the databases

MongoDB documentation

List Databases

Since server release

3.6

listDatabases

ListDatabasesIterable<Document> listDatabases()

Gets the list of databases

Returns:

the list databases iterable interface

listDatabases

ListDatabasesIterable<Document> listDatabases(ClientSession clientSession)

Gets the list of databases

Parameters:

clientSession - the client session with which to associate this operation

Returns:

the list databases iterable interface

MongoDB documentation

List Databases

Since server release

3.6

listDatabases

<TResult> ListDatabasesIterable<TResult> listDatabases(Class<TResult> resultClass)

Gets the list of databases

Type Parameters:

TResult - the type of the class to use instead of Document.

Parameters:

resultClass - the class to cast the database documents to

Returns:

the list databases iterable interface

listDatabases

<TResult> ListDatabasesIterable<TResult> listDatabases(ClientSession clientSession,
                                                       Class<TResult> resultClass)

Gets the list of databases

Type Parameters:

TResult - the type of the class to use instead of Document.

Parameters:

clientSession - the client session with which to associate this operation

resultClass - the class to cast the database documents to

Returns:

the list databases iterable interface

MongoDB documentation

List Databases

Since server release

3.6

watch

ChangeStreamIterable<Document> watch()

Creates a change stream for this client.

Returns:

the change stream iterable

Since:

3.8

MongoDB documentation

Change Streams

Since server release

4.0

watch

<TResult> ChangeStreamIterable<TResult> watch(Class<TResult> resultClass)

Creates a change stream for this client.

Type Parameters:

TResult - the target document type of the iterable.

Parameters:

resultClass - the class to decode each document into

Returns:

the change stream iterable

Since:

3.8

MongoDB documentation

Change Streams

Since server release

4.0

watch

ChangeStreamIterable<Document> watch(List<? extends Bson> pipeline)

Creates a change stream for this client.

Parameters:

pipeline - the aggregation pipeline to apply to the change stream.

Returns:

the change stream iterable

Since:

3.8

MongoDB documentation

Change Streams

Since server release

4.0

watch

<TResult> ChangeStreamIterable<TResult> watch(List<? extends Bson> pipeline,
                                              Class<TResult> resultClass)

Creates a change stream for this client.

Type Parameters:

TResult - the target document type of the iterable.

Parameters:

pipeline - the aggregation pipeline to apply to the change stream

resultClass - the class to decode each document into

Returns:

the change stream iterable

Since:

3.8

MongoDB documentation

Change Streams

Since server release

4.0

watch

ChangeStreamIterable<Document> watch(ClientSession clientSession)

Creates a change stream for this client.

Parameters:

clientSession - the client session with which to associate this operation

Returns:

the change stream iterable

Since:

3.8

MongoDB documentation

Change Streams

Since server release

4.0

watch

<TResult> ChangeStreamIterable<TResult> watch(ClientSession clientSession,
                                              Class<TResult> resultClass)

Creates a change stream for this client.

Type Parameters:

TResult - the target document type of the iterable.

Parameters:

clientSession - the client session with which to associate this operation

resultClass - the class to decode each document into

Returns:

the change stream iterable

Since:

3.8

MongoDB documentation

Change Streams

Since server release

4.0

watch

ChangeStreamIterable<Document> watch(ClientSession clientSession,
                                     List<? extends Bson> pipeline)

Creates a change stream for this client.

Parameters:

clientSession - the client session with which to associate this operation

pipeline - the aggregation pipeline to apply to the change stream.

Returns:

the change stream iterable

Since:

3.8

MongoDB documentation

Change Streams

Since server release

4.0

watch

<TResult> ChangeStreamIterable<TResult> watch(ClientSession clientSession,
                                              List<? extends Bson> pipeline,
                                              Class<TResult> resultClass)

Creates a change stream for this client.

Type Parameters:

TResult - the target document type of the iterable.

Parameters:

clientSession - the client session with which to associate this operation

pipeline - the aggregation pipeline to apply to the change stream

resultClass - the class to decode each document into

Returns:

the change stream iterable

Since:

3.8

MongoDB documentation

Change Streams

Since server release

4.0