@decaf-ts/core
Version:
Core persistence module for the decaf framework
142 lines • 18.9 kB
JavaScript
import { Sequence as Seq } from "./model/RamSequence.js";
import { InternalError, NotFoundError } from "@decaf-ts/db-decorators";
import { Sequence } from "./../persistence/index.js";
import { Repository } from "./../repository/index.js";
/**
* @description RAM-specific sequence implementation
* @summary Extends the base Sequence class to provide auto-incrementing sequence functionality
* for the RAM adapter. This class manages sequences stored in memory, allowing for the generation
* of sequential identifiers for entities.
* @param {SequenceOptions} options - Configuration options for the sequence
* @param {RamAdapter} adapter - The RAM adapter instance to use for storage
* @class RamSequence
* @category Ram
* @example
* ```typescript
* // Create a new numeric sequence starting at 1
* const sequence = new RamSequence({
* name: 'order_sequence',
* type: 'Number',
* startWith: 1,
* incrementBy: 1
* }, ramAdapter);
*
* // Get the next value in the sequence
* const nextId = await sequence.next();
*
* // Get a range of values
* const idRange = await sequence.range(5); // Returns 5 sequential values
* ```
*/
export class RamSequence extends Sequence {
constructor(options, adapter) {
super(options);
this.repo = Repository.forModel(Seq, adapter.alias);
}
/**
* @description Retrieves the current value of the sequence
* @summary Gets the current value of the sequence from storage. If the sequence
* doesn't exist yet, it returns the configured starting value.
* @return A promise that resolves to the current sequence value
*/
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}`);
}
}
/**
* @description Parses a value according to the sequence type
* @summary Converts a value to the appropriate type for the sequence (string, number, or bigint)
* using the base Sequence class's parseValue method.
* @param {string | number | bigint} value - The value to parse
* @return {string | number | bigint} The parsed value in the correct type
*/
parse(value) {
return Sequence.parseValue(this.options.type, value);
}
/**
* @description Increments the sequence value
* @summary Increases the current sequence value by the specified amount and persists
* the new value to storage. This method handles both numeric and BigInt sequence types.
* @param {string | number | bigint} current - The current value of the sequence
* @param {number} [count] - Optional amount to increment by, defaults to the sequence's incrementBy value
* @return A promise that resolves to the new sequence value after incrementing
*/
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;
const repo = this.repo.override({
ignoredValidationProperties: ["updatedOn"],
});
try {
seq = await repo.update(new Seq({ id: name, current: next }));
}
catch (e) {
if (!(e instanceof NotFoundError)) {
throw e;
}
seq = await repo.create(new Seq({ id: name, current: next }));
}
return seq.current;
}
/**
* @description Gets the next value in the sequence
* @summary Retrieves the current value of the sequence and increments it by the
* configured increment amount. This is the main method used to get a new sequential value.
* @return A promise that resolves to the next value in the sequence
*/
async next() {
const current = await this.current();
return this.increment(current);
}
/**
* @description Generates a range of sequential values
* @summary Retrieves a specified number of sequential values from the sequence.
* This is useful when you need to allocate multiple IDs at once.
* The method increments the sequence by the total amount needed and returns all values in the range.
* @param {number} count - The number of sequential values to generate
* @return A promise that resolves to an array of sequential values
*/
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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This class manages sequences stored in memory, allowing for the generation\n * of sequential identifiers for entities.\n * @param {SequenceOptions} options - Configuration options for the sequence\n * @param {RamAdapter} adapter - The RAM adapter instance to use for storage\n * @class RamSequence\n * @category Ram\n * @example\n * ```typescript\n * // Create a new numeric sequence starting at 1\n * const sequence = new RamSequence({\n *   name: 'order_sequence',\n *   type: 'Number',\n *   startWith: 1,\n *   incrementBy: 1\n * }, ramAdapter);\n *\n * // Get the next value in the sequence\n * const nextId = await sequence.next();\n *\n * // Get a range of values\n * const idRange = await sequence.range(5); // Returns 5 sequential values\n * ```\n */\nexport class RamSequence extends Sequence {\n  protected repo: Repo<Seq>;\n\n  constructor(options: SequenceOptions, adapter: RamAdapter) {\n    super(options);\n    this.repo = Repository.forModel(Seq, adapter.alias);\n  }\n\n  /**\n   * @description Retrieves the current value of the sequence\n   * @summary Gets the current value of the sequence from storage. If the sequence\n   * doesn't exist yet, it returns the configured starting value.\n   * @return A promise that resolves to the current sequence value\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: any) {\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   * @description Parses a value according to the sequence type\n   * @summary Converts a value to the appropriate type for the sequence (string, number, or bigint)\n   * using the base Sequence class's parseValue method.\n   * @param {string | number | bigint} value - The value to parse\n   * @return {string | number | bigint} The parsed value in the correct type\n   */\n  private parse(value: string | number | bigint): string | number | bigint {\n    return Sequence.parseValue(this.options.type, value);\n  }\n\n  /**\n   * @description Increments the sequence value\n   * @summary Increases the current sequence value by the specified amount and persists\n   * the new value to storage. This method handles both numeric and BigInt sequence types.\n   * @param {string | number | bigint} current - The current value of the sequence\n   * @param {number} [count] - Optional amount to increment by, defaults to the sequence's incrementBy value\n   * @return A promise that resolves to the new sequence value after incrementing\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    const repo = this.repo.override({\n      ignoredValidationProperties: [\"updatedOn\"],\n    });\n    try {\n      seq = await repo.update(new Seq({ id: name, current: next }));\n    } catch (e: any) {\n      if (!(e instanceof NotFoundError)) {\n        throw e;\n      }\n      seq = await repo.create(new Seq({ id: name, current: next }));\n    }\n\n    return seq.current as string | number | bigint;\n  }\n\n  /**\n   * @description Gets the next value in the sequence\n   * @summary Retrieves the current value of the sequence and increments it by the\n   * configured increment amount. This is the main method used to get a new sequential value.\n   * @return A promise that resolves to the next value in the sequence\n   */\n  async next(): Promise<number | string | bigint> {\n    const current = await this.current();\n    return this.increment(current);\n  }\n\n  /**\n   * @description Generates a range of sequential values\n   * @summary Retrieves a specified number of sequential values from the sequence.\n   * This is useful when you need to allocate multiple IDs at once.\n   * The method increments the sequence by the total amount needed and returns all values in the range.\n   * @param {number} count - The number of sequential values to generate\n   * @return A promise that resolves to an array of sequential values\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\n"]}