node-firebird-driver/src/lib/impl/events.ts

Firebird Driver Interfaces for Node.js

import { AbstractAttachment } from './attachment';

import { Events } from '..';

/** AbstractStatement implementation. */
export abstract class AbstractEvents implements Events {
  protected constructor(public attachment?: AbstractAttachment) {}

  /** Cancel this events' resources. */
  async cancel(): Promise<void> {
    this.check();

    await this.internalCancel();

    this.attachment?.events.delete(this);
    this.attachment = undefined;
  }

  get isValid(): boolean {
    return !!this.attachment;
  }

  private check() {
    if (!this.isValid) {
      throw new Error('Events are already cancelled.');
    }
  }

  protected abstract internalCancel(): Promise<void>;
}