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| 1 | +/** |
| 2 | + * @copyright Cube Dev, Inc. |
| 3 | + * @license Apache-2.0 |
| 4 | + * @fileoverview Named pool wrapper around generic-pool with enhanced error messages. |
| 5 | + */ |
| 6 | + |
| 7 | +import genericPool, { Pool as GenericPool, Factory, Options } from 'generic-pool'; |
| 8 | + |
| 9 | +export { Factory, Options as PoolOptions } from 'generic-pool'; |
| 10 | + |
| 11 | +export class PoolTimeoutError extends Error { |
| 12 | + public readonly poolName: string; |
| 13 | + |
| 14 | + public constructor(poolName: string) { |
| 15 | + super(`ResourceRequest timed out (pool: ${poolName})`); |
| 16 | + this.name = 'PoolTimeoutError'; |
| 17 | + this.poolName = poolName; |
| 18 | + } |
| 19 | +} |
| 20 | + |
| 21 | +/** |
| 22 | + * Uses composition instead of inheritance because generic-pool doesn't export |
| 23 | + * a Pool class, the Pool type is an interface, not an extendable class. |
| 24 | + */ |
| 25 | +export class Pool<T> { |
| 26 | + private readonly pool: GenericPool<T>; |
| 27 | + |
| 28 | + private readonly name: string; |
| 29 | + |
| 30 | + public constructor(name: string, factory: Factory<T>, options?: Options) { |
| 31 | + this.name = name; |
| 32 | + this.pool = genericPool.createPool<T>(factory, options); |
| 33 | + } |
| 34 | + |
| 35 | + public async acquire(priority?: number): Promise<T> { |
| 36 | + try { |
| 37 | + return await this.pool.acquire(priority); |
| 38 | + } catch (error) { |
| 39 | + if (error instanceof Error && error.name === 'TimeoutError') { |
| 40 | + throw new PoolTimeoutError(this.name); |
| 41 | + } |
| 42 | + |
| 43 | + throw error; |
| 44 | + } |
| 45 | + } |
| 46 | + |
| 47 | + public async release(resource: T): Promise<void> { |
| 48 | + return this.pool.release(resource); |
| 49 | + } |
| 50 | + |
| 51 | + public async destroy(resource: T): Promise<void> { |
| 52 | + return this.pool.destroy(resource); |
| 53 | + } |
| 54 | + |
| 55 | + public async drain(): Promise<void> { |
| 56 | + return this.pool.drain(); |
| 57 | + } |
| 58 | + |
| 59 | + public async clear(): Promise<void> { |
| 60 | + return this.pool.clear(); |
| 61 | + } |
| 62 | + |
| 63 | + public async use<U>(cb: (resource: T) => U | Promise<U>): Promise<U> { |
| 64 | + try { |
| 65 | + return await this.pool.use(cb); |
| 66 | + } catch (error) { |
| 67 | + if (error instanceof Error && error.name === 'TimeoutError') { |
| 68 | + throw new PoolTimeoutError(this.name); |
| 69 | + } |
| 70 | + throw error; |
| 71 | + } |
| 72 | + } |
| 73 | + |
| 74 | + // State accessors |
| 75 | + public get size(): number { |
| 76 | + return this.pool.size; |
| 77 | + } |
| 78 | + |
| 79 | + public get available(): number { |
| 80 | + return this.pool.available; |
| 81 | + } |
| 82 | + |
| 83 | + public get borrowed(): number { |
| 84 | + return this.pool.borrowed; |
| 85 | + } |
| 86 | + |
| 87 | + public get pending(): number { |
| 88 | + return this.pool.pending; |
| 89 | + } |
| 90 | + |
| 91 | + public get max(): number { |
| 92 | + return this.pool.max; |
| 93 | + } |
| 94 | + |
| 95 | + public get min(): number { |
| 96 | + return this.pool.min; |
| 97 | + } |
| 98 | + |
| 99 | + // Event handling |
| 100 | + public on(event: 'factoryCreateError' | 'factoryDestroyError', listener: (err: Error) => void): this { |
| 101 | + this.pool.on(event, listener); |
| 102 | + return this; |
| 103 | + } |
| 104 | + |
| 105 | + // For backward compatibility (drivers use pool._factory for testConnection) |
| 106 | + public get _factory(): Factory<T> { |
| 107 | + // eslint-disable-next-line no-underscore-dangle |
| 108 | + return (this.pool as any)._factory; |
| 109 | + } |
| 110 | +} |
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