@decaf-ts/core/lib/ram/RamAdapter.d.ts

Core persistence module for the decaf framework

import { RamFlags, RawRamQuery, RamStorage, RamRepository, RamConfig } from "./types";
import { RamStatement } from "./RamStatement";
import { RamContext } from "./RamContext";
import { Adapter, Sequence } from "../persistence";
import { SequenceOptions } from "../interfaces";
import { Constructor, Model } from "@decaf-ts/decorator-validation";
import { BaseError, OperationKeys } from "@decaf-ts/db-decorators";
/**
 * @description In-memory adapter for data persistence
 * @summary The RamAdapter provides an in-memory implementation of the persistence layer.
 * It stores data in JavaScript Maps and provides CRUD operations and query capabilities.
 * This adapter is useful for testing, prototyping, and applications that don't require
 * persistent storage across application restarts.
 * @class RamAdapter
 * @category Ram
 * @example
 * ```typescript
 * // Create a new RAM adapter
 * const adapter = new RamAdapter('myRamAdapter');
 *
 * // Create a repository for a model
 * const userRepo = new (adapter.repository<User>())(User, adapter);
 *
 * // Perform CRUD operations
 * const user = new User({ name: 'John', email: 'john@example.com' });
 * await userRepo.create(user);
 * const retrievedUser = await userRepo.findById(user.id);
 * ```
 * @mermaid
 * sequenceDiagram
 *   participant Client
 *   participant Repository
 *   participant RamAdapter
 *   participant Storage as In-Memory Storage
 *
 *   Client->>Repository: create(model)
 *   Repository->>RamAdapter: create(tableName, id, model)
 *   RamAdapter->>RamAdapter: lock.acquire()
 *   RamAdapter->>Storage: set(id, model)
 *   RamAdapter->>RamAdapter: lock.release()
 *   RamAdapter-->>Repository: model
 *   Repository-->>Client: model
 *
 *   Client->>Repository: findById(id)
 *   Repository->>RamAdapter: read(tableName, id)
 *   RamAdapter->>Storage: get(id)
 *   Storage-->>RamAdapter: model
 *   RamAdapter-->>Repository: model
 *   Repository-->>Client: model
 */
export declare class RamAdapter extends Adapter<RamConfig, RamStorage, RawRamQuery<any>, RamFlags, RamContext> {
    constructor(conf?: RamConfig, alias?: string);
    /**
     * @description Gets the repository constructor for a model
     * @summary Returns a constructor for creating repositories that work with the specified model type.
     * This method overrides the base implementation to provide RAM-specific repository functionality.
     * @template M - The model type for the repository
     * @return {Constructor<RamRepository<M>>} A constructor for creating RAM repositories
     */
    repository<M extends Model<boolean>>(): Constructor<RamRepository<M>>;
    /**
     * @description Creates operation flags with UUID
     * @summary Extends the base flags with a UUID for user identification.
     * This method ensures that all operations have a unique identifier for tracking purposes.
     * @template M - The model type for the operation
     * @param {OperationKeys} operation - The type of operation being performed
     * @param {Constructor<M>} model - The model constructor
     * @param {Partial<RamFlags>} flags - Partial flags to be extended
     * @return {Promise<RamFlags>} Complete flags with UUID
     */
    flags<M extends Model<boolean>>(operation: OperationKeys, model: Constructor<M>, flags: Partial<RamFlags>): Promise<RamFlags>;
    Context: typeof RamContext;
    private indexes;
    private lock;
    /**
     * @description Indexes models in the RAM adapter
     * @summary A no-op indexing method for the RAM adapter.
     * Since RAM adapter doesn't require explicit indexing, this method simply resolves immediately.
     * @param models - Models to be indexed (unused)
     * @return {Promise<any>} A promise that resolves when indexing is complete
     */
    index(...models: Record<string, any>[]): Promise<any>;
    /**
     * @description Prepares a model for storage
     * @summary Converts a model instance to a format suitable for storage in the RAM adapter.
     * This method extracts the primary key and creates a record without the primary key field.
     * @template M - The model type being prepared
     * @param {M} model - The model instance to prepare
     * @param pk - The primary key property name
     * @return Object containing the record and ID
     */
    prepare<M extends Model>(model: M, pk: keyof M): {
        record: Record<string, any>;
        id: string;
    };
    /**
     * @description Converts a stored record back to a model instance
     * @summary Reconstructs a model instance from a stored record by adding back the primary key.
     * This method is the inverse of the prepare method.
     * @template M - The model type to revert to
     * @param {Record<string, any>} obj - The stored record
     * @param {string | Constructor<M>} clazz - The model class or name
     * @param pk - The primary key property name
     * @param {string | number} id - The primary key value
     * @return {M} The reconstructed model instance
     */
    revert<M extends Model>(obj: Record<string, any>, clazz: string | Constructor<M>, pk: keyof M, id: string | number): M;
    /**
     * @description Creates a new record in the in-memory storage
     * @summary Stores a new record in the specified table with the given ID.
     * This method acquires a lock to ensure thread safety, creates the table if it doesn't exist,
     * checks for conflicts, and stores the model.
     * @param {string} tableName - The name of the table to store the record in
     * @param {string | number} id - The unique identifier for the record
     * @param {Record<string, any>} model - The record data to store
     * @return {Promise<Record<string, any>>} A promise that resolves to the stored record
     * @mermaid
     * sequenceDiagram
     *   participant Caller
     *   participant RamAdapter
     *   participant Storage as In-Memory Storage
     *
     *   Caller->>RamAdapter: create(tableName, id, model)
     *   RamAdapter->>RamAdapter: lock.acquire()
     *   RamAdapter->>Storage: has(tableName)
     *   alt Table doesn't exist
     *     RamAdapter->>Storage: set(tableName, new Map())
     *   end
     *   RamAdapter->>Storage: has(id)
     *   alt Record exists
     *     RamAdapter-->>Caller: throw ConflictError
     *   end
     *   RamAdapter->>Storage: set(id, model)
     *   RamAdapter->>RamAdapter: lock.release()
     *   RamAdapter-->>Caller: model
     */
    create(tableName: string, id: string | number, model: Record<string, any>): Promise<Record<string, any>>;
    /**
     * @description Retrieves a record from in-memory storage
     * @summary Fetches a record with the specified ID from the given table.
     * This method checks if the table and record exist and throws appropriate errors if not.
     * @param {string} tableName - The name of the table to retrieve from
     * @param {string | number} id - The unique identifier of the record to retrieve
     * @return {Promise<Record<string, any>>} A promise that resolves to the retrieved record
     * @mermaid
     * sequenceDiagram
     *   participant Caller
     *   participant RamAdapter
     *   participant Storage as In-Memory Storage
     *
     *   Caller->>RamAdapter: read(tableName, id)
     *   RamAdapter->>Storage: has(tableName)
     *   alt Table doesn't exist
     *     RamAdapter-->>Caller: throw NotFoundError
     *   end
     *   RamAdapter->>Storage: has(id)
     *   alt Record doesn't exist
     *     RamAdapter-->>Caller: throw NotFoundError
     *   end
     *   RamAdapter->>Storage: get(id)
     *   Storage-->>RamAdapter: record
     *   RamAdapter-->>Caller: record
     */
    read(tableName: string, id: string | number): Promise<Record<string, any>>;
    /**
     * @description Updates an existing record in the in-memory storage
     * @summary Updates a record with the specified ID in the given table.
     * This method acquires a lock to ensure thread safety, checks if the table and record exist,
     * and updates the record with the new data.
     * @param {string} tableName - The name of the table containing the record
     * @param {string | number} id - The unique identifier of the record to update
     * @param {Record<string, any>} model - The new record data
     * @return {Promise<Record<string, any>>} A promise that resolves to the updated record
     * @mermaid
     * sequenceDiagram
     *   participant Caller
     *   participant RamAdapter
     *   participant Storage as In-Memory Storage
     *
     *   Caller->>RamAdapter: update(tableName, id, model)
     *   RamAdapter->>RamAdapter: lock.acquire()
     *   RamAdapter->>Storage: has(tableName)
     *   alt Table doesn't exist
     *     RamAdapter-->>Caller: throw NotFoundError
     *   end
     *   RamAdapter->>Storage: has(id)
     *   alt Record doesn't exist
     *     RamAdapter-->>Caller: throw NotFoundError
     *   end
     *   RamAdapter->>Storage: set(id, model)
     *   RamAdapter->>RamAdapter: lock.release()
     *   RamAdapter-->>Caller: model
     */
    update(tableName: string, id: string | number, model: Record<string, any>): Promise<Record<string, any>>;
    /**
     * @description Deletes a record from the in-memory storage
     * @summary Removes a record with the specified ID from the given table.
     * This method acquires a lock to ensure thread safety, checks if the table and record exist,
     * retrieves the record before deletion, and then removes it from storage.
     * @param {string} tableName - The name of the table containing the record
     * @param {string | number} id - The unique identifier of the record to delete
     * @return {Promise<Record<string, any>>} A promise that resolves to the deleted record
     * @mermaid
     * sequenceDiagram
     *   participant Caller
     *   participant RamAdapter
     *   participant Storage as In-Memory Storage
     *
     *   Caller->>RamAdapter: delete(tableName, id)
     *   RamAdapter->>RamAdapter: lock.acquire()
     *   RamAdapter->>Storage: has(tableName)
     *   alt Table doesn't exist
     *     RamAdapter-->>Caller: throw NotFoundError
     *   end
     *   RamAdapter->>Storage: has(id)
     *   alt Record doesn't exist
     *     RamAdapter-->>Caller: throw NotFoundError
     *   end
     *   RamAdapter->>Storage: get(id)
     *   Storage-->>RamAdapter: record
     *   RamAdapter->>Storage: delete(id)
     *   RamAdapter->>RamAdapter: lock.release()
     *   RamAdapter-->>Caller: record
     */
    delete(tableName: string, id: string | number): Promise<Record<string, any>>;
    /**
     * @description Gets or creates a table in the in-memory storage
     * @summary Retrieves the Map representing a table for a given model or table name.
     * If the table doesn't exist, it creates a new one. This is a helper method used
     * by other methods to access the correct storage location.
     * @template M - The model type for the table
     * @param {string | Constructor<M>} from - The model class or table name
     * @return {Map<string | number, any> | undefined} The table Map or undefined
     */
    protected tableFor<M extends Model>(from: string | Constructor<M>): Map<string | number, any> | undefined;
    /**
     * @description Executes a raw query against the in-memory storage
     * @summary Performs a query operation on the in-memory data store using the provided query specification.
     * This method supports filtering, sorting, pagination, and field selection.
     * @template R - The return type of the query
     * @param {RawRamQuery<any>} rawInput - The query specification
     * @return {Promise<R>} A promise that resolves to the query results
     * @mermaid
     * sequenceDiagram
     *   participant Caller
     *   participant RamAdapter
     *   participant Storage as In-Memory Storage
     *
     *   Caller->>RamAdapter: raw(rawInput)
     *   RamAdapter->>RamAdapter: tableFor(from)
     *   alt Table doesn't exist
     *     RamAdapter-->>Caller: throw InternalError
     *   end
     *   RamAdapter->>RamAdapter: findPrimaryKey(new from())
     *   RamAdapter->>Storage: entries()
     *   Storage-->>RamAdapter: entries
     *   loop For each entry
     *     RamAdapter->>RamAdapter: revert(r, from, id, pk)
     *   end
     *   alt Where condition exists
     *     RamAdapter->>RamAdapter: result.filter(where)
     *   end
     *   alt Sort condition exists
     *     RamAdapter->>RamAdapter: result.sort(sort)
     *   end
     *   alt Skip specified
     *     RamAdapter->>RamAdapter: result.slice(skip)
     *   end
     *   alt Limit specified
     *     RamAdapter->>RamAdapter: result.slice(0, limit)
     *   end
     *   alt Select fields specified
     *     loop For each result
     *       RamAdapter->>RamAdapter: Filter to selected fields
     *     end
     *   end
     *   RamAdapter-->>Caller: result
     */
    raw<R>(rawInput: RawRamQuery<any>): Promise<R>;
    /**
     * @description Parses and converts errors to appropriate types
     * @summary Ensures that errors are of the correct type for consistent error handling.
     * If the error is already a BaseError, it's returned as is; otherwise, it's wrapped in an InternalError.
     * @template V - The expected error type, extending BaseError
     * @param {Error} err - The error to parse
     * @return {V} The parsed error of the expected type
     */
    parseError<V extends BaseError>(err: Error): V;
    /**
     * @description Creates a new statement builder for queries
     * @summary Factory method that creates a new RamStatement instance for building queries.
     * This method allows for fluent query construction against the RAM adapter.
     * @template M - The model type for the statement
     * @return {RamStatement<M, any>} A new statement builder instance
     */
    Statement<M extends Model<boolean>>(): RamStatement<M, any>;
    /**
     * @description Creates a new sequence for generating sequential IDs
     * @summary Factory method that creates a new RamSequence instance for ID generation.
     * This method provides a way to create auto-incrementing sequences for entity IDs.
     * @param {SequenceOptions} options - Configuration options for the sequence
     * @return {Promise<Sequence>} A promise that resolves to the new sequence instance
     */
    Sequence(options: SequenceOptions): Promise<Sequence>;
    for(config: Partial<RamConfig>, ...args: any[]): typeof this;
    /**
     * @description Sets up RAM-specific decorations for model properties
     * @summary Configures decorations for createdBy and updatedBy fields in the RAM adapter.
     * This static method is called during initialization to set up handlers that automatically
     * populate these fields with the current user's UUID during create and update operations.
     * @return {void}
     * @mermaid
     * sequenceDiagram
     *   participant RamAdapter
     *   participant Decoration
     *   participant Repository
     *
     *   RamAdapter->>Repository: key(PersistenceKeys.CREATED_BY)
     *   Repository-->>RamAdapter: createdByKey
     *   RamAdapter->>Repository: key(PersistenceKeys.UPDATED_BY)
     *   Repository-->>RamAdapter: updatedByKey
     *
     *   RamAdapter->>Decoration: flavouredAs(RamFlavour)
     *   Decoration-->>RamAdapter: DecoratorBuilder
     *   RamAdapter->>Decoration: for(createdByKey)
     *   RamAdapter->>Decoration: define(onCreate, propMetadata)
     *   RamAdapter->>Decoration: apply()
     *
     *   RamAdapter->>Decoration: flavouredAs(RamFlavour)
     *   Decoration-->>RamAdapter: DecoratorBuilder
     *   RamAdapter->>Decoration: for(updatedByKey)
     *   RamAdapter->>Decoration: define(onCreate, propMetadata)
     *   RamAdapter->>Decoration: apply()
     */
    static decoration(): void;
    protected getClient(): RamStorage;
}