@decaf-ts/core/lib/ram/RamSequence.cjs

Core persistence module for the decaf framework

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.RamSequence = void 0;
const RamSequence_1 = require("./model/RamSequence.cjs");
const db_decorators_1 = require("@decaf-ts/db-decorators");
const persistence_1 = require("./../persistence/index.cjs");
const repository_1 = require("./../repository/index.cjs");
/**
 * @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
 * ```
 */
class RamSequence extends persistence_1.Sequence {
    constructor(options, adapter) {
        super(options);
        this.repo = repository_1.Repository.forModel(RamSequence_1.Sequence, 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 db_decorators_1.NotFoundError) {
                if (typeof startWith === "undefined")
                    throw new db_decorators_1.InternalError("Starting value is not defined for a non existing sequence");
                try {
                    return this.parse(startWith);
                }
                catch (e) {
                    throw new db_decorators_1.InternalError(`Failed to parse initial value for sequence ${startWith}: ${e}`);
                }
            }
            throw new db_decorators_1.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 persistence_1.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 db_decorators_1.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 db_decorators_1.InternalError("Should never happen");
        }
        let seq;
        const repo = this.repo.override({
            ignoredValidationProperties: ["updatedOn"],
        });
        try {
            seq = await repo.update(new RamSequence_1.Sequence({ id: name, current: next }));
        }
        catch (e) {
            if (!(e instanceof db_decorators_1.NotFoundError)) {
                throw e;
            }
            seq = await repo.create(new RamSequence_1.Sequence({ 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 db_decorators_1.InternalError("Miscalculation of range");
        return range;
    }
}
exports.RamSequence = RamSequence;
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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"]}