JSONValue can not be used by custom defined interfaces (#201)

[poolifier.git] / src / pools / abstract-pool.ts

diff --git a/src/pools/abstract-pool.ts b/src/pools/abstract-pool.ts
index 4f467bf4ebe869ac8215d8c5cc6aa1842edb7aad..0435a32c47067442af13cde6773a7831754e516f 100644 (file)
--- a/src/pools/abstract-pool.ts
+++ b/src/pools/abstract-pool.ts
@@ -2,6 +2,13 @@ import EventEmitter from 'events'
 import type { MessageValue } from '../utility-types'
 import type { IPool } from './pool'
 
+/**
+ * An intentional empty function.
+ */
+function emptyFunction () {
+  // intentionally left blank
+}
+
 /**
  * Callback invoked if the worker raised an error.
  */
@@ -87,8 +94,8 @@ class PoolEmitter extends EventEmitter {}
  * Base class containing some shared logic for all poolifier pools.
  *
  * @template Worker Type of worker which manages this pool.
- * @template Data Type of data sent to the worker.
- * @template Response Type of response of execution.
+ * @template Data Type of data sent to the worker. This can only be serializable data.
+ * @template Response Type of response of execution. This can only be serializable data.
  */
 export abstract class AbstractPool<
   Worker extends IWorker,
@@ -142,10 +149,7 @@ export abstract class AbstractPool<
     if (!this.isMain()) {
       throw new Error('Cannot start a pool from a worker!')
     }
-    // TODO christopher 2021-02-07: Improve this check e.g. with a pattern or blank check
-    if (!this.filePath) {
-      throw new Error('Please specify a file with a worker implementation')
-    }
+    this.checkFilePath(this.filePath)
     this.setupHook()
 
     for (let i = 1; i <= this.numberOfWorkers; i++) {
@@ -155,10 +159,16 @@ export abstract class AbstractPool<
     this.emitter = new PoolEmitter()
   }
 
+  private checkFilePath (filePath: string) {
+    if (!filePath) {
+      throw new Error('Please specify a file with a worker implementation')
+    }
+  }
+
   /**
    * Perform the task specified in the constructor with the data parameter.
    *
-   * @param data The input for the specified task.
+   * @param data The input for the specified task. This can only be serializable data.
    * @returns Promise that will be resolved when the task is successfully completed.
    */
   public execute (data: Data): Promise<Response> {
@@ -317,9 +327,9 @@ export abstract class AbstractPool<
   protected createAndSetupWorker (): Worker {
     const worker: Worker = this.createWorker()
 
-    worker.on('error', this.opts.errorHandler ?? (() => {}))
-    worker.on('online', this.opts.onlineHandler ?? (() => {}))
-    worker.on('exit', this.opts.exitHandler ?? (() => {}))
+    worker.on('error', this.opts.errorHandler ?? emptyFunction)
+    worker.on('online', this.opts.onlineHandler ?? emptyFunction)
+    worker.on('exit', this.opts.exitHandler ?? emptyFunction)
     worker.once('exit', () => this.removeWorker(worker))
 
     this.workers.push(worker)