@decaf-ts/db-decorators
Version:
Agnostic database decorators and repository
164 lines • 18 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.Context = exports.DefaultContextFactory = void 0;
const constants_1 = require("./constants.cjs");
const typed_object_accumulator_1 = require("typed-object-accumulator");
/**
* @description Default factory for creating context instances.
* @summary A factory function that creates new Context instances with the provided repository flags.
* It automatically adds a timestamp to the context and returns a properly typed context instance.
* @const DefaultContextFactory
* @memberOf module:db-decorators
*/
const DefaultContextFactory = (arg) => {
return new Context().accumulate(Object.assign({}, arg, { timestamp: new Date() }));
};
exports.DefaultContextFactory = DefaultContextFactory;
/**
* @description A context management class for handling repository operations.
* @summary The Context class provides a mechanism for managing repository operations with flags,
* parent-child relationships, and state accumulation. It allows for hierarchical context chains
* and maintains operation-specific configurations while supporting type safety through generics.
*
* @template F - Type extending RepositoryFlags that defines the context configuration
*
* @param {ObjectAccumulator<F>} cache - The internal cache storing accumulated values
*
* @class
*
* @example
* ```typescript
* // Creating a new context with repository flags
* const context = new Context<RepositoryFlags>();
*
* // Accumulating values
* const enrichedContext = context.accumulate({
* writeOperation: true,
* affectedTables: ['users'],
* operation: OperationKeys.CREATE
* });
*
* // Accessing values
* const isWrite = enrichedContext.get('writeOperation'); // true
* const tables = enrichedContext.get('affectedTables'); // ['users']
* ```
*
* @mermaid
* sequenceDiagram
* participant C as Client
* participant Ctx as Context
* participant Cache as ObjectAccumulator
*
* C->>Ctx: new Context()
* Ctx->>Cache: create cache
*
* C->>Ctx: accumulate(value)
* Ctx->>Cache: accumulate(value)
* Cache-->>Ctx: updated cache
* Ctx-->>C: updated context
*
* C->>Ctx: get(key)
* Ctx->>Cache: get(key)
* alt Key exists in cache
* Cache-->>Ctx: value
* else Key not found
* Ctx->>Ctx: check parent context
* alt Parent exists
* Ctx->>Parent: get(key)
* Parent-->>Ctx: value
* else No parent
* Ctx-->>C: throw error
* end
* end
* Ctx-->>C: requested value
*/
class Context {
constructor() {
this.cache = new typed_object_accumulator_1.ObjectAccumulator();
Object.defineProperty(this, "cache", {
value: new typed_object_accumulator_1.ObjectAccumulator(),
writable: false,
enumerable: false,
configurable: true,
});
}
static { this.factory = exports.DefaultContextFactory; }
/**
* @description Accumulates new values into the context.
* @summary Merges the provided value object with the existing context state,
* creating a new immutable cache state.
*/
accumulate(value) {
Object.defineProperty(this, "cache", {
value: this.cache.accumulate(value),
writable: false,
enumerable: false,
configurable: true,
});
return this;
}
get timestamp() {
return this.cache.timestamp;
}
/**
* @description Retrieves a value from the context by key.
*/
get(key) {
try {
return this.cache.get(key);
}
catch (e) {
const parent = this.cache.parentContext;
if (parent)
return parent.get(key);
throw e;
}
}
/**
* @description Creates a child context from another context
*/
static childFrom(context, overrides) {
return Context.factory(Object.assign({}, context.cache, overrides || {}));
}
/**
* @description Creates a new context from operation parameters
*/
static async from(operation, overrides, model,
// eslint-disable-next-line @typescript-eslint/no-unused-vars
...args) {
return Context.factory(Object.assign({}, constants_1.DefaultRepositoryFlags, overrides, {
operation: operation,
model: model,
}));
}
/**
* @description Prepares arguments for context operations
*/
static async args(operation, model, args, contextual, overrides) {
const last = args.pop();
async function getContext() {
if (contextual)
return contextual.context(operation, overrides || {}, model, ...args);
return Context.from(operation, overrides || {}, model, ...args);
}
let c;
if (last) {
if (last instanceof Context) {
c = last;
args.push(last);
}
else {
args.push(last);
c = (await getContext());
args.push(c);
}
}
else {
c = (await getContext());
args.push(c);
}
return { context: c, args: args };
}
}
exports.Context = Context;
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It allows for hierarchical context chains\n * and maintains operation-specific configurations while supporting type safety through generics.\n *\n * @template F - Type extending RepositoryFlags that defines the context configuration\n *\n * @param {ObjectAccumulator<F>} cache - The internal cache storing accumulated values\n *\n * @class\n *\n * @example\n * ```typescript\n * // Creating a new context with repository flags\n * const context = new Context<RepositoryFlags>();\n *\n * // Accumulating values\n * const enrichedContext = context.accumulate({\n *   writeOperation: true,\n *   affectedTables: ['users'],\n *   operation: OperationKeys.CREATE\n * });\n *\n * // Accessing values\n * const isWrite = enrichedContext.get('writeOperation'); // true\n * const tables = enrichedContext.get('affectedTables'); // ['users']\n * ```\n *\n * @mermaid\n * sequenceDiagram\n *   participant C as Client\n *   participant Ctx as Context\n *   participant Cache as ObjectAccumulator\n *\n *   C->>Ctx: new Context()\n *   Ctx->>Cache: create cache\n *\n *   C->>Ctx: accumulate(value)\n *   Ctx->>Cache: accumulate(value)\n *   Cache-->>Ctx: updated cache\n *   Ctx-->>C: updated context\n *\n *   C->>Ctx: get(key)\n *   Ctx->>Cache: get(key)\n *   alt Key exists in cache\n *     Cache-->>Ctx: value\n *   else Key not found\n *     Ctx->>Ctx: check parent context\n *     alt Parent exists\n *       Ctx->>Parent: get(key)\n *       Parent-->>Ctx: value\n *     else No parent\n *       Ctx-->>C: throw error\n *     end\n *   end\n *   Ctx-->>C: requested value\n */\nexport class Context<F extends RepositoryFlags> {\n  constructor() {\n    Object.defineProperty(this, \"cache\", {\n      value: new ObjectAccumulator<F>(),\n      writable: false,\n      enumerable: false,\n      configurable: true,\n    });\n  }\n\n  static factory: ContextFactory<any> = DefaultContextFactory;\n\n  readonly cache: RepositoryFlags & ObjectAccumulator<any> =\n    new ObjectAccumulator() as unknown as RepositoryFlags &\n      ObjectAccumulator<any>;\n\n  /**\n   * @description Accumulates new values into the context.\n   * @summary Merges the provided value object with the existing context state,\n   * creating a new immutable cache state.\n   */\n  accumulate<V extends object>(value: V) {\n    Object.defineProperty(this, \"cache\", {\n      value: (this.cache as ObjectAccumulator<any>).accumulate(value),\n      writable: false,\n      enumerable: false,\n      configurable: true,\n    });\n    return this as unknown as Context<F & V>;\n  }\n\n  get timestamp() {\n    return (this.cache as any).timestamp as F[\"timestamp\"];\n  }\n\n  /**\n   * @description Retrieves a value from the context by key.\n   */\n  get<K extends keyof F>(key: K): F[K] {\n    try {\n      return (this.cache as ObjectAccumulator<any>).get(\n        key as unknown as string\n      ) as F[K];\n    } catch (e: unknown) {\n      const parent = (this.cache as any).parentContext as\n        | Context<F>\n        | undefined;\n      if (parent) return parent.get(key);\n      throw e;\n    }\n  }\n\n  /**\n   * @description Creates a child context from another context\n   */\n  static childFrom<F extends RepositoryFlags, C extends Context<F>>(\n    context: C,\n    overrides?: Partial<F>\n  ): C {\n    return Context.factory(\n      Object.assign({}, (context as any).cache, overrides || {})\n    ) as unknown as C;\n  }\n\n  /**\n   * @description Creates a new context from operation parameters\n   */\n  static async from<\n    M extends Model,\n    F extends RepositoryFlags,\n    C extends Context<F>,\n  >(\n    operation:\n      | OperationKeys.CREATE\n      | OperationKeys.READ\n      | OperationKeys.UPDATE\n      | OperationKeys.DELETE,\n    overrides: Partial<F>,\n    model: Constructor<M>,\n    // eslint-disable-next-line @typescript-eslint/no-unused-vars\n    ...args: any[]\n  ): Promise<C> {\n    return Context.factory(\n      Object.assign({}, DefaultRepositoryFlags as RepositoryFlags, overrides, {\n        operation: operation,\n        model: model,\n      })\n    ) as C;\n  }\n\n  /**\n   * @description Prepares arguments for context operations\n   */\n  static async args<\n    M extends Model<any>,\n    C extends Context<F>,\n    F extends RepositoryFlags,\n  >(\n    operation:\n      | OperationKeys.CREATE\n      | OperationKeys.READ\n      | OperationKeys.UPDATE\n      | OperationKeys.DELETE,\n    model: Constructor<M>,\n    args: any[],\n    contextual?: Contextual<F>,\n    overrides?: Partial<F>\n  ): Promise<ContextArgs<F, C>> {\n    const last = args.pop();\n\n    async function getContext() {\n      if (contextual)\n        return contextual.context(operation, overrides || {}, model, ...args);\n      return Context.from(operation, overrides || {}, model, ...args);\n    }\n\n    let c: C;\n    if (last) {\n      if (last instanceof Context) {\n        c = last as C;\n        args.push(last);\n      } else {\n        args.push(last);\n        c = (await getContext()) as C;\n        args.push(c);\n      }\n    } else {\n      c = (await getContext()) as C;\n      args.push(c);\n    }\n\n    return { context: c, args: args };\n  }\n}\n"]}