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Class ClientSession

A class representing a client session on the server

NOTE: not meant to be instantiated directly.

Hierarchy

Index

Constructors

constructor

Properties

Optional [kPinnedConnection]

[kPinnedConnection]?: Connection

Optional [kServerSession]

[kServerSession]?: ServerSession

[kSnapshotEnabled]

[kSnapshotEnabled]: boolean = false

Optional [kSnapshotTime]

[kSnapshotTime]?: Timestamp

Optional clientOptions

clientOptions?: MongoOptions

Optional clusterTime

clusterTime?: ClusterTime

defaultTransactionOptions

defaultTransactionOptions: TransactionOptions

explicit

explicit: boolean

hasEnded

hasEnded: boolean

Optional operationTime

operationTime?: Timestamp

Optional owner

owner?: symbol | AbstractCursor<any, AbstractCursorEvents>

sessionPool

sessionPool: ServerSessionPool

supports

supports: { causalConsistency: boolean }

Type declaration

  • causalConsistency: boolean

topology

topology: Topology

transaction

transaction: Transaction

Static Readonly captureRejectionSymbol

captureRejectionSymbol: typeof captureRejectionSymbol

Static captureRejections

captureRejections: boolean

Sets or gets the default captureRejection value for all emitters.

Static defaultMaxListeners

defaultMaxListeners: number

Static Readonly errorMonitor

errorMonitor: typeof errorMonitor

This symbol shall be used to install a listener for only monitoring 'error' events. Listeners installed using this symbol are called before the regular 'error' listeners are called.

Installing a listener using this symbol does not change the behavior once an 'error' event is emitted, therefore the process will still crash if no regular 'error' listener is installed.

Accessors

id

isPinned

  • get isPinned(): boolean

loadBalanced

  • get loadBalanced(): boolean

pinnedConnection

serverSession

snapshotEnabled

  • get snapshotEnabled(): boolean
  • Whether or not this session is configured for snapshot reads

    Returns boolean

Methods

abortTransaction

addListener

advanceClusterTime

  • Advances the clusterTime for a ClientSession to the provided clusterTime of another ClientSession

    Parameters

    • clusterTime: ClusterTime

      the $clusterTime returned by the server from another session in the form of a document containing the BSON.Timestamp clusterTime and signature

    Returns void

advanceOperationTime

  • advanceOperationTime(operationTime: Timestamp): void
  • Advances the operationTime for a ClientSession.

    Parameters

    • operationTime: Timestamp

      the BSON.Timestamp of the operation type it is desired to advance to

    Returns void

commitTransaction

emit

  • emit<EventKey>(event: symbol | EventKey, ...args: Parameters<ClientSessionEvents[EventKey]>): boolean

endSession

equals

eventNames

  • eventNames(): string[]

getMaxListeners

  • getMaxListeners(): number

inTransaction

  • inTransaction(): boolean
  • Returns boolean

    whether this session is currently in a transaction or not

incrementTransactionNumber

  • incrementTransactionNumber(): void
  • Increment the transaction number on the internal ServerSession

    Returns void

listenerCount

  • listenerCount<EventKey>(type: string | symbol | EventKey): number

listeners

off

on

once

pin

prependListener

prependOnceListener

rawListeners

removeAllListeners

  • removeAllListeners<EventKey>(event?: string | symbol | EventKey): ClientSession

removeListener

setMaxListeners

startTransaction

toBSON

  • toBSON(): never
  • This is here to ensure that ClientSession is never serialized to BSON.

    Returns never

unpin

  • unpin(options?: { error?: AnyError; force?: boolean; forceClear?: boolean }): void
  • Parameters

    • Optional options: { error?: AnyError; force?: boolean; forceClear?: boolean }
      • Optional error?: AnyError
      • Optional force?: boolean
      • Optional forceClear?: boolean

    Returns void

withTransaction

  • Runs a provided lambda within a transaction, retrying either the commit operation or entire transaction as needed (and when the error permits) to better ensure that the transaction can complete successfully.

    IMPORTANT: This method requires the user to return a Promise, all lambdas that do not return a Promise will result in undefined behavior.

    Type parameters

    • T = void

    Parameters

    Returns Promise<T>

Static getEventListeners

  • getEventListeners(emitter: DOMEventTarget | EventEmitter, name: string | symbol): Function[]
  • Returns a copy of the array of listeners for the event named eventName.

    For EventEmitters this behaves exactly the same as calling .listeners on the emitter.

    For EventTargets this is the only way to get the event listeners for the event target. This is useful for debugging and diagnostic purposes.

    const { getEventListeners, EventEmitter } = require('events');

    {
    const ee = new EventEmitter();
    const listener = () => console.log('Events are fun');
    ee.on('foo', listener);
    getEventListeners(ee, 'foo'); // [listener]
    }
    {
    const et = new EventTarget();
    const listener = () => console.log('Events are fun');
    et.addEventListener('foo', listener);
    getEventListeners(et, 'foo'); // [listener]
    }
    since

    v15.2.0

    Parameters

    • emitter: DOMEventTarget | EventEmitter
    • name: string | symbol

    Returns Function[]

Static listenerCount

  • listenerCount(emitter: EventEmitter, eventName: string | symbol): number
  • A class method that returns the number of listeners for the given eventNameregistered on the given emitter.

    const { EventEmitter, listenerCount } = require('events');
    const myEmitter = new EventEmitter();
    myEmitter.on('event', () => {});
    myEmitter.on('event', () => {});
    console.log(listenerCount(myEmitter, 'event'));
    // Prints: 2
    since

    v0.9.12

    deprecated

    Since v3.2.0 - Use listenerCount instead.

    Parameters

    • emitter: EventEmitter

      The emitter to query

    • eventName: string | symbol

      The event name

    Returns number

Static on

  • on(emitter: EventEmitter, eventName: string, options?: StaticEventEmitterOptions): AsyncIterableIterator<any>
  • ```js const { on, EventEmitter } = require('events');

    (async () => { const ee = new EventEmitter();

    // Emit later on process.nextTick(() => { ee.emit('foo', 'bar'); ee.emit('foo', 42); });

    for await (const event of on(ee, 'foo')) { // The execution of this inner block is synchronous and it // processes one event at a time (even with await). Do not use // if concurrent execution is required. console.log(event); // prints ['bar'] [42] } // Unreachable here })();


    Returns an `AsyncIterator` that iterates `eventName` events. It will throw
    if the `EventEmitter` emits `'error'`. It removes all listeners when
    exiting the loop. The `value` returned by each iteration is an array
    composed of the emitted event arguments.

    An `AbortSignal` can be used to cancel waiting on events:

    ```js
    const { on, EventEmitter } = require('events');
    const ac = new AbortController();

    (async () => {
    const ee = new EventEmitter();

    // Emit later on
    process.nextTick(() => {
    ee.emit('foo', 'bar');
    ee.emit('foo', 42);
    });

    for await (const event of on(ee, 'foo', { signal: ac.signal })) {
    // The execution of this inner block is synchronous and it
    // processes one event at a time (even with await). Do not use
    // if concurrent execution is required.
    console.log(event); // prints ['bar'] [42]
    }
    // Unreachable here
    })();

    process.nextTick(() => ac.abort());
    since

    v13.6.0, v12.16.0

    Parameters

    • emitter: EventEmitter
    • eventName: string

      The name of the event being listened for

    • Optional options: StaticEventEmitterOptions

    Returns AsyncIterableIterator<any>

    that iterates eventName events emitted by the emitter

Static once

  • once(emitter: NodeEventTarget, eventName: string | symbol, options?: StaticEventEmitterOptions): Promise<any[]>
  • once(emitter: DOMEventTarget, eventName: string, options?: StaticEventEmitterOptions): Promise<any[]>
  • Creates a Promise that is fulfilled when the EventEmitter emits the given event or that is rejected if the EventEmitter emits 'error' while waiting. The Promise will resolve with an array of all the arguments emitted to the given event.

    This method is intentionally generic and works with the web platform EventTarget interface, which has no special'error' event semantics and does not listen to the 'error' event.

    const { once, EventEmitter } = require('events');

    async function run() {
    const ee = new EventEmitter();

    process.nextTick(() => {
    ee.emit('myevent', 42);
    });

    const [value] = await once(ee, 'myevent');
    console.log(value);

    const err = new Error('kaboom');
    process.nextTick(() => {
    ee.emit('error', err);
    });

    try {
    await once(ee, 'myevent');
    } catch (err) {
    console.log('error happened', err);
    }
    }

    run();

    The special handling of the 'error' event is only used when events.once()is used to wait for another event. If events.once() is used to wait for the 'error' event itself, then it is treated as any other kind of event without special handling:

    const { EventEmitter, once } = require('events');

    const ee = new EventEmitter();

    once(ee, 'error')
    .then(([err]) => console.log('ok', err.message))
    .catch((err) => console.log('error', err.message));

    ee.emit('error', new Error('boom'));

    // Prints: ok boom

    An AbortSignal can be used to cancel waiting for the event:

    const { EventEmitter, once } = require('events');

    const ee = new EventEmitter();
    const ac = new AbortController();

    async function foo(emitter, event, signal) {
    try {
    await once(emitter, event, { signal });
    console.log('event emitted!');
    } catch (error) {
    if (error.name === 'AbortError') {
    console.error('Waiting for the event was canceled!');
    } else {
    console.error('There was an error', error.message);
    }
    }
    }

    foo(ee, 'foo', ac.signal);
    ac.abort(); // Abort waiting for the event
    ee.emit('foo'); // Prints: Waiting for the event was canceled!
    since

    v11.13.0, v10.16.0

    Parameters

    • emitter: NodeEventTarget
    • eventName: string | symbol
    • Optional options: StaticEventEmitterOptions

    Returns Promise<any[]>

  • Parameters

    • emitter: DOMEventTarget
    • eventName: string
    • Optional options: StaticEventEmitterOptions

    Returns Promise<any[]>

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