Implements: IReferenceable, IConfigurable, IOpenable

Description

The MongoDbConnection class allows you to create a MongoDB connection using the official driver.

Important points

• By defining a connection and sharing it through multiple persistence components you can reduce the number of used database connections.

Configuration parameters

connection(s):

• discovery_key: (optional) key to retrieve the connection from IDiscovery
• host: host name or IP address
• port: port number (default: 27017)
• uri: resource URI or connection string with all parameters in it

credential(s):

• store_key: (optional) key to retrieve the credentials from ICredentialStore
• username: (optional) username
• password: (optional) user’s password

options:

• max_pool_size: (optional) maximum connection pool size (default: 2)
• keep_alive: (optional) enable connection keep alive (default: true)
• connect_timeout: (optional) connection timeout in milliseconds (default: 5000)
• socket_timeout: (optional) socket timeout in milliseconds (default: 360000)
• auto_reconnect: (optional) enable auto reconnection (default: true)
• reconnect_interval: (optional) reconnection interval in milliseconds (default: 1000)
• max_page_size: (optional) maximum page size (default: 100)
• replica_set: (optional) name of replica set
• ssl: (optional) enable SSL connection (default: false)
• auth_source: (optional) authentication source
• debug: (optional) enable debug output (default: false).

References

• *:logger:*:*:1.0 - (optional) ILogger components to pass log messages
• *:discovery:*:*:1.0 - (optional) IDiscovery services
• *:credential-store:*:*:1.0 - (optional) credential stores to resolve credentials

Constructors

Creates a new instance of the connection component.

public constructor()

Fields

_logger

The logger.

protected _logger: CompositeLogger

_connectionResolver

The connection resolver.

protected _connectionResolver: MongoDbConnectionResolver

_options

The configuration options.

protected _options: ConfigParams

_connection

The MongoDB connection object.

protected _connection: any

_databaseName

The MongoDB database name.

protected _databaseName: string

_db

The MongoDB database object.

protected _db: any

Instance methods

close

Closes a component and frees used resources.

public close(context: IContext): Promise<void>

• context: IContext - (optional) a context to trace execution through a call chain.

configure

Configures a component by passing its configuration parameters.

public configure(config: ConfigParams): void

• config: ConfigParams - configuration parameters to be set.

getConnection

Gets the connection.

public getConnection(): any

• return: any - connection to a MongoDB database

getDatabase

Gets the MongoDB database.

public getDatabase(): any

• return: any - MongoDB database

isOpen

Checks if the component is opened.

public isOpen(): boolean

• return: boolean - True if the component has been opened and False otherwise.

open

Opens the component.

public async open(context: IContext): Promise<void>

• context: IContext - (optional) a context to trace execution through a call chain.

setReferences

Sets the references to the dependent components.

public setReferences(references: IReferences): void

• references: IReferences - references to locate the component dependencies.