@decaf-ts/for-couchdb
Version:
template for ts projects
110 lines • 13.7 kB
JavaScript
import { Sequence as Seq } from "./../model/CouchDBSequence.js";
import { InternalError, NotFoundError } from "@decaf-ts/db-decorators";
import { Repository } from "@decaf-ts/core";
import { Sequence } from "@decaf-ts/core";
/**
* @summary Abstract implementation of a Sequence
* @description provides the basic functionality for {@link Sequence}s
*
* @param {SequenceOptions} options
*
* @class CouchDBSequence
* @implements Sequence
*/
export class CouchDBSequence extends Sequence {
constructor(options, adapter) {
super(options);
this.repo = Repository.forModel(Seq, adapter.alias);
}
/**
* @summary Retrieves the current value for the sequence
* @protected
*/
async current() {
const { name, startWith } = this.options;
try {
const sequence = await this.repo.read(name);
return this.parse(sequence.current);
}
catch (e) {
if (e instanceof NotFoundError) {
if (typeof startWith === "undefined")
throw new InternalError("Starting value is not defined for a non existing sequence");
try {
return this.parse(startWith);
}
catch (e) {
throw new InternalError(`Failed to parse initial value for sequence ${startWith}: ${e}`);
}
}
throw new InternalError(`Failed to retrieve current value for sequence ${name}: ${e}`);
}
}
/**
* @summary Parses the {@link Sequence} value
*
* @protected
* @param value
*/
parse(value) {
return Sequence.parseValue(this.options.type, value);
}
/**
* @summary increments the sequence
* @description Sequence specific implementation
*
* @param {string | number | bigint} current
* @param count
* @protected
*/
async increment(current, count) {
const { type, incrementBy, name } = this.options;
let next;
const toIncrementBy = count || incrementBy;
if (toIncrementBy % incrementBy !== 0)
throw new InternalError(`Value to increment does not consider the incrementBy setting: ${incrementBy}`);
switch (type) {
case "Number":
next = this.parse(current) + toIncrementBy;
break;
case "BigInt":
next = this.parse(current) + BigInt(toIncrementBy);
break;
default:
throw new InternalError("Should never happen");
}
let seq;
try {
seq = await this.repo.update(new Seq({ id: name, current: next }));
}
catch (e) {
if (!(e instanceof NotFoundError))
throw e;
seq = await this.repo.create(new Seq({ id: name, current: next }));
}
return seq.current;
}
/**
* @summary Generates the next value in th sequence
* @description calls {@link Sequence#parse} on the current value
* followed by {@link Sequence#increment}
*
*/
async next() {
const current = await this.current();
return this.increment(current);
}
async range(count) {
const current = (await this.current());
const incrementBy = this.parse(this.options.incrementBy);
const next = await this.increment(current, this.parse(count) * incrementBy);
const range = [];
for (let i = 1; i <= count; i++) {
range.push(current + incrementBy * this.parse(i));
}
if (range[range.length - 1] !== next)
throw new InternalError("Miscalculation of range");
return range;
}
}
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{ Sequence as Seq } from \"../model/CouchDBSequence\";\nimport { InternalError, NotFoundError } from \"@decaf-ts/db-decorators\";\nimport { Adapter, Repository, SequenceOptions } from \"@decaf-ts/core\";\nimport { Sequence } from \"@decaf-ts/core\";\nimport { MangoQuery } from \"../types\";\nimport { CouchDBRepository } from \"../interfaces\";\n\n/**\n * @summary Abstract implementation of a Sequence\n * @description provides the basic functionality for {@link Sequence}s\n *\n * @param {SequenceOptions} options\n *\n * @class CouchDBSequence\n * @implements Sequence\n */\nexport class CouchDBSequence extends Sequence {\n  protected repo: CouchDBRepository<Seq, any, any, any>;\n\n  constructor(\n    options: SequenceOptions,\n    adapter: Adapter<any, MangoQuery, any, any>\n  ) {\n    super(options);\n    this.repo = Repository.forModel(Seq, adapter.alias);\n  }\n\n  /**\n   * @summary Retrieves the current value for the sequence\n   * @protected\n   */\n  async current(): Promise<string | number | bigint> {\n    const { name, startWith } = this.options;\n    try {\n      const sequence: Seq = await this.repo.read(name as string);\n      return this.parse(sequence.current as string | number);\n    } catch (e: any) {\n      if (e instanceof NotFoundError) {\n        if (typeof startWith === \"undefined\")\n          throw new InternalError(\n            \"Starting value is not defined for a non existing sequence\"\n          );\n        try {\n          return this.parse(startWith);\n        } catch (e: unknown) {\n          throw new InternalError(\n            `Failed to parse initial value for sequence ${startWith}: ${e}`\n          );\n        }\n      }\n      throw new InternalError(\n        `Failed to retrieve current value for sequence ${name}: ${e}`\n      );\n    }\n  }\n\n  /**\n   * @summary Parses the {@link Sequence} value\n   *\n   * @protected\n   * @param value\n   */\n  private parse(value: string | number | bigint): string | number | bigint {\n    return Sequence.parseValue(this.options.type, value);\n  }\n\n  /**\n   * @summary increments the sequence\n   * @description Sequence specific implementation\n   *\n   * @param {string | number | bigint} current\n   * @param count\n   * @protected\n   */\n  private async increment(\n    current: string | number | bigint,\n    count?: number\n  ): Promise<string | number | bigint> {\n    const { type, incrementBy, name } = this.options;\n    let next: string | number | bigint;\n    const toIncrementBy = count || incrementBy;\n    if (toIncrementBy % incrementBy !== 0)\n      throw new InternalError(\n        `Value to increment does not consider the incrementBy setting: ${incrementBy}`\n      );\n    switch (type) {\n      case \"Number\":\n        next = (this.parse(current) as number) + toIncrementBy;\n        break;\n      case \"BigInt\":\n        next = (this.parse(current) as bigint) + BigInt(toIncrementBy);\n        break;\n      default:\n        throw new InternalError(\"Should never happen\");\n    }\n    let seq: Seq;\n    try {\n      seq = await this.repo.update(new Seq({ id: name, current: next }));\n    } catch (e: any) {\n      if (!(e instanceof NotFoundError)) throw e;\n      seq = await this.repo.create(new Seq({ id: name, current: next }));\n    }\n\n    return seq.current as string | number | bigint;\n  }\n\n  /**\n   * @summary Generates the next value in th sequence\n   * @description calls {@link Sequence#parse} on the current value\n   * followed by {@link Sequence#increment}\n   *\n   */\n  async next(): Promise<number | string | bigint> {\n    const current = await this.current();\n    return this.increment(current);\n  }\n\n  async range(count: number): Promise<(number | string | bigint)[]> {\n    const current = (await this.current()) as number;\n    const incrementBy = this.parse(this.options.incrementBy) as number;\n    const next: string | number | bigint = await this.increment(\n      current,\n      (this.parse(count) as number) * incrementBy\n    );\n    const range: (number | string | bigint)[] = [];\n    for (let i: number = 1; i <= count; i++) {\n      range.push(current + incrementBy * (this.parse(i) as number));\n    }\n    if (range[range.length - 1] !== next)\n      throw new InternalError(\"Miscalculation of range\");\n    return range;\n  }\n}\n"]}