@decaf-ts/core
Version:
Core persistence module for the decaf framework
187 lines • 24.3 kB
JavaScript
import { InternalError, OperationKeys, BulkCrudOperationKeys, } from "@decaf-ts/db-decorators";
import { Adapter } from "./Adapter.js";
import { UnsupportedError } from "./errors.js";
import { Logging } from "@decaf-ts/logging";
/**
* @description Dispatches database operation events to observers
* @summary The Dispatch class implements the Observable interface and is responsible for intercepting
* database operations from an Adapter and notifying observers when changes occur. It uses proxies to
* wrap the adapter's CRUD methods and automatically trigger observer updates after operations complete.
* @template Y - The native database driver type
* @param {void} - No constructor parameters
* @class Dispatch
* @example
* ```typescript
* // Creating and using a Dispatch instance
* const dispatch = new Dispatch<PostgresDriver>();
*
* // Connect it to an adapter
* const adapter = new PostgresAdapter(connection);
* dispatch.observe(adapter);
*
* // Now any CRUD operations on the adapter will automatically
* // trigger observer notifications
* await adapter.create('users', 123, userModel);
* // Observers will be notified about the creation
*
* // When done, you can disconnect
* dispatch.unObserve(adapter);
* ```
*/
export class Dispatch {
/**
* @description Accessor for the logger
* @summary Gets or initializes the logger for this dispatch instance
* @return {Logger} The logger instance
*/
get log() {
if (!this.logger)
this.logger = Logging.for(this).for(this.adapter);
return this.logger;
}
/**
* @description Creates a new Dispatch instance
* @summary Initializes a new Dispatch instance without any adapter
*/
constructor() { }
/**
* @description Initializes the dispatch by proxying adapter methods
* @summary Sets up proxies on the adapter's CRUD methods to intercept operations and notify observers.
* This method is called automatically when an adapter is observed.
* @return {Promise<void>} A promise that resolves when initialization is complete
* @mermaid
* sequenceDiagram
* participant Dispatch
* participant Adapter
* participant Proxy
*
* Dispatch->>Dispatch: initialize()
* Dispatch->>Dispatch: Check if adapter exists
* alt No adapter
* Dispatch-->>Dispatch: Throw InternalError
* end
*
* loop For each CRUD method
* Dispatch->>Adapter: Check if method exists
* alt Method doesn't exist
* Dispatch-->>Dispatch: Throw InternalError
* end
*
* Dispatch->>Adapter: Get property descriptor
* loop While descriptor not found
* Dispatch->>Adapter: Check prototype chain
* end
*
* alt Descriptor not found or not writable
* Dispatch->>Dispatch: Log error and continue
* else Descriptor found and writable
* Dispatch->>Proxy: Create proxy for method
* Dispatch->>Adapter: Replace method with proxy
* end
* end
*/
async initialize() {
if (!this.adapter)
throw new InternalError(`No adapter observed for dispatch`);
const adapter = this.adapter;
[
OperationKeys.CREATE,
OperationKeys.UPDATE,
OperationKeys.DELETE,
BulkCrudOperationKeys.CREATE_ALL,
BulkCrudOperationKeys.UPDATE_ALL,
BulkCrudOperationKeys.DELETE_ALL,
].forEach((method) => {
if (!adapter[method])
throw new InternalError(`Method ${method} not found in ${adapter.alias} adapter to bind Observables Dispatch`);
let descriptor = Object.getOwnPropertyDescriptor(adapter, method);
let proto = adapter;
while (!descriptor && proto !== Object.prototype) {
proto = Object.getPrototypeOf(proto);
descriptor = Object.getOwnPropertyDescriptor(proto, method);
}
if (!descriptor || !descriptor.writable) {
this.log.error(`Could not find method ${method} to bind Observables Dispatch`);
return;
}
function bulkToSingle(method) {
switch (method) {
case BulkCrudOperationKeys.CREATE_ALL:
return OperationKeys.CREATE;
case BulkCrudOperationKeys.UPDATE_ALL:
return OperationKeys.UPDATE;
case BulkCrudOperationKeys.DELETE_ALL:
return OperationKeys.DELETE;
default:
return method;
}
}
// @ts-expect-error because there are read only properties
adapter[method] = new Proxy(adapter[method], {
apply: async (target, thisArg, argArray) => {
const [tableName, ids] = argArray;
const result = await target.apply(thisArg, argArray);
this.updateObservers(tableName, bulkToSingle(method), ids)
.then(() => {
this.log.verbose(`Observer refresh dispatched by ${method} for ${tableName}`);
this.log.debug(`pks: ${ids}`);
})
.catch((e) => this.log.error(`Failed to dispatch observer refresh for ${method} on ${tableName}: ${e}`));
return result;
},
});
});
}
/**
* @description Closes the dispatch
* @summary Performs any necessary cleanup when the dispatch is no longer needed
* @return {Promise<void>} A promise that resolves when closing is complete
*/
async close() {
// to nothing in this instance but may be required for closing connections
}
/**
* @description Starts observing an adapter
* @summary Connects this dispatch to an adapter to monitor its operations
* @param {Adapter<Y, any, any, any>} observer - The adapter to observe
* @return {void}
*/
observe(observer) {
if (!(observer instanceof Adapter))
throw new UnsupportedError("Only Adapters can be observed by dispatch");
this.adapter = observer;
this.native = observer.native;
this.models = Adapter.models(this.adapter.alias);
this.initialize().then(() => this.log.verbose(`Dispatch initialized for ${this.adapter.alias} adapter`));
}
/**
* @description Stops observing an adapter
* @summary Disconnects this dispatch from an adapter
* @param {Observer} observer - The adapter to stop observing
* @return {void}
*/
unObserve(observer) {
if (this.adapter !== observer)
throw new UnsupportedError("Only the adapter that was used to observe can be unobserved");
this.adapter = undefined;
}
/**
* @description Updates observers about a database event
* @summary Notifies observers about a change in the database
* @param {string} table - The name of the table where the change occurred
* @param {OperationKeys|BulkCrudOperationKeys|string} event - The type of operation that occurred
* @param {EventIds} id - The identifier(s) of the affected record(s)
* @return {Promise<void>} A promise that resolves when all observers have been notified
*/
async updateObservers(table, event, id) {
if (!this.adapter)
throw new InternalError(`No adapter observed for dispatch`);
try {
await this.adapter.refresh(table, event, id);
}
catch (e) {
throw new InternalError(`Failed to refresh dispatch: ${e}`);
}
}
}
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It uses proxies to\n * wrap the adapter's CRUD methods and automatically trigger observer updates after operations complete.\n * @template Y - The native database driver type\n * @param {void} - No constructor parameters\n * @class Dispatch\n * @example\n * ```typescript\n * // Creating and using a Dispatch instance\n * const dispatch = new Dispatch<PostgresDriver>();\n *\n * // Connect it to an adapter\n * const adapter = new PostgresAdapter(connection);\n * dispatch.observe(adapter);\n *\n * // Now any CRUD operations on the adapter will automatically\n * // trigger observer notifications\n * await adapter.create('users', 123, userModel);\n * // Observers will be notified about the creation\n *\n * // When done, you can disconnect\n * dispatch.unObserve(adapter);\n * ```\n */\nexport class Dispatch<Y> implements Observable {\n  /**\n   * @description The adapter being observed\n   * @summary Reference to the database adapter whose operations are being monitored\n   */\n  protected adapter?: Adapter<Y, any, any, any>;\n\n  /**\n   * @description The native database driver\n   * @summary Reference to the underlying database driver from the adapter\n   */\n  protected native?: Y;\n\n  /**\n   * @description List of model constructors\n   * @summary Array of model constructors that are registered with the adapter\n   */\n  protected models!: ModelConstructor<any>[];\n\n  /**\n   * @description Logger instance\n   * @summary Logger for recording dispatch activities\n   */\n  private logger!: Logger;\n\n  /**\n   * @description Accessor for the logger\n   * @summary Gets or initializes the logger for this dispatch instance\n   * @return {Logger} The logger instance\n   */\n  protected get log() {\n    if (!this.logger)\n      this.logger = Logging.for(this as any).for(this.adapter as any);\n    return this.logger;\n  }\n\n  /**\n   * @description Creates a new Dispatch instance\n   * @summary Initializes a new Dispatch instance without any adapter\n   */\n  constructor() {}\n\n  /**\n   * @description Initializes the dispatch by proxying adapter methods\n   * @summary Sets up proxies on the adapter's CRUD methods to intercept operations and notify observers.\n   * This method is called automatically when an adapter is observed.\n   * @return {Promise<void>} A promise that resolves when initialization is complete\n   * @mermaid\n   * sequenceDiagram\n   *   participant Dispatch\n   *   participant Adapter\n   *   participant Proxy\n   *\n   *   Dispatch->>Dispatch: initialize()\n   *   Dispatch->>Dispatch: Check if adapter exists\n   *   alt No adapter\n   *     Dispatch-->>Dispatch: Throw InternalError\n   *   end\n   *\n   *   loop For each CRUD method\n   *     Dispatch->>Adapter: Check if method exists\n   *     alt Method doesn't exist\n   *       Dispatch-->>Dispatch: Throw InternalError\n   *     end\n   *\n   *     Dispatch->>Adapter: Get property descriptor\n   *     loop While descriptor not found\n   *       Dispatch->>Adapter: Check prototype chain\n   *     end\n   *\n   *     alt Descriptor not found or not writable\n   *       Dispatch->>Dispatch: Log error and continue\n   *     else Descriptor found and writable\n   *       Dispatch->>Proxy: Create proxy for method\n   *       Dispatch->>Adapter: Replace method with proxy\n   *     end\n   *   end\n   */\n  protected async initialize(): Promise<void> {\n    if (!this.adapter)\n      throw new InternalError(`No adapter observed for dispatch`);\n    const adapter = this.adapter as Adapter<Y, any, any, any>;\n    (\n      [\n        OperationKeys.CREATE,\n        OperationKeys.UPDATE,\n        OperationKeys.DELETE,\n        BulkCrudOperationKeys.CREATE_ALL,\n        BulkCrudOperationKeys.UPDATE_ALL,\n        BulkCrudOperationKeys.DELETE_ALL,\n      ] as (keyof Adapter<Y, any, any, any>)[]\n    ).forEach((method) => {\n      if (!adapter[method])\n        throw new InternalError(\n          `Method ${method} not found in ${adapter.alias} adapter to bind Observables Dispatch`\n        );\n\n      let descriptor = Object.getOwnPropertyDescriptor(adapter, method);\n      let proto: any = adapter;\n      while (!descriptor && proto !== Object.prototype) {\n        proto = Object.getPrototypeOf(proto);\n        descriptor = Object.getOwnPropertyDescriptor(proto, method);\n      }\n\n      if (!descriptor || !descriptor.writable) {\n        this.log.error(\n          `Could not find method ${method} to bind Observables Dispatch`\n        );\n        return;\n      }\n      function bulkToSingle(method: string) {\n        switch (method) {\n          case BulkCrudOperationKeys.CREATE_ALL:\n            return OperationKeys.CREATE;\n          case BulkCrudOperationKeys.UPDATE_ALL:\n            return OperationKeys.UPDATE;\n          case BulkCrudOperationKeys.DELETE_ALL:\n            return OperationKeys.DELETE;\n          default:\n            return method;\n        }\n      }\n      // @ts-expect-error because there are read only properties\n      adapter[method] = new Proxy(adapter[method], {\n        apply: async (target: any, thisArg, argArray: any[]) => {\n          const [tableName, ids] = argArray;\n          const result = await target.apply(thisArg, argArray);\n          this.updateObservers(tableName, bulkToSingle(method), ids as EventIds)\n            .then(() => {\n              this.log.verbose(\n                `Observer refresh dispatched by ${method} for ${tableName}`\n              );\n              this.log.debug(`pks: ${ids}`);\n            })\n            .catch((e: unknown) =>\n              this.log.error(\n                `Failed to dispatch observer refresh for ${method} on ${tableName}: ${e}`\n              )\n            );\n          return result;\n        },\n      });\n    });\n  }\n\n  /**\n   * @description Closes the dispatch\n   * @summary Performs any necessary cleanup when the dispatch is no longer needed\n   * @return {Promise<void>} A promise that resolves when closing is complete\n   */\n  async close() {\n    // to nothing in this instance but may be required for closing connections\n  }\n\n  /**\n   * @description Starts observing an adapter\n   * @summary Connects this dispatch to an adapter to monitor its operations\n   * @param {Adapter<Y, any, any, any>} observer - The adapter to observe\n   * @return {void}\n   */\n  observe(observer: Adapter<Y, any, any, any>): void {\n    if (!(observer instanceof Adapter))\n      throw new UnsupportedError(\"Only Adapters can be observed by dispatch\");\n    this.adapter = observer;\n    this.native = observer.native;\n    this.models = Adapter.models(this.adapter.alias);\n    this.initialize().then(() =>\n      this.log.verbose(\n        `Dispatch initialized for ${this.adapter!.alias} adapter`\n      )\n    );\n  }\n\n  /**\n   * @description Stops observing an adapter\n   * @summary Disconnects this dispatch from an adapter\n   * @param {Observer} observer - The adapter to stop observing\n   * @return {void}\n   */\n  unObserve(observer: Observer): void {\n    if (this.adapter !== observer)\n      throw new UnsupportedError(\n        \"Only the adapter that was used to observe can be unobserved\"\n      );\n    this.adapter = undefined;\n  }\n\n  /**\n   * @description Updates observers about a database event\n   * @summary Notifies observers about a change in the database\n   * @param {string} table - The name of the table where the change occurred\n   * @param {OperationKeys|BulkCrudOperationKeys|string} event - The type of operation that occurred\n   * @param {EventIds} id - The identifier(s) of the affected record(s)\n   * @return {Promise<void>} A promise that resolves when all observers have been notified\n   */\n  async updateObservers(\n    table: string,\n    event: OperationKeys | BulkCrudOperationKeys | string,\n    id: EventIds\n  ): Promise<void> {\n    if (!this.adapter)\n      throw new InternalError(`No adapter observed for dispatch`);\n    try {\n      await this.adapter.refresh(table, event, id);\n    } catch (e: unknown) {\n      throw new InternalError(`Failed to refresh dispatch: ${e}`);\n    }\n  }\n}\n"]}