From cb47904741f96ebc7fa32f29a2fca7df2f64d606 Mon Sep 17 00:00:00 2001
From: Hossein Zamanian <zamanian@kaman.ir>
Date: Tue, 7 Sep 2021 18:09:13 +0430
Subject: [PATCH 1/3] add event for acquired and released function

Took 16 minutes
---
 lib/Pool.js | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/lib/Pool.js b/lib/Pool.js
index 0a006dd..9dbe520 100644
--- a/lib/Pool.js
+++ b/lib/Pool.js
@@ -20,6 +20,8 @@ const reflector = require("./utils").reflector;
  */
 const FACTORY_CREATE_ERROR = "factoryCreateError";
 const FACTORY_DESTROY_ERROR = "factoryDestroyError";
+const RESOURCE_ACQUIRED = "resourceAcquired";
+const RESOURCE_RELEASED = "resourceReleased";
 
 class Pool extends EventEmitter {
   /**
@@ -467,7 +469,10 @@ class Pool extends EventEmitter {
     this._waitingClientsQueue.enqueue(resourceRequest, priority);
     this._dispense();
 
-    return resourceRequest.promise;
+    return resourceRequest.promise.then(resource => {
+      this.emit(RESOURCE_ACQUIRED);
+      return resource;
+    });
   }
 
   /**
@@ -527,7 +532,10 @@ class Pool extends EventEmitter {
     this._addPooledResourceToAvailableObjects(pooledResource);
 
     this._dispense();
-    return this._Promise.resolve();
+    return this._Promise.resolve().then(res => {
+      this.emit(RESOURCE_RELEASED);
+      return res;
+    });
   }
 
   /**

From aed32db793c80cf0c9214e59ac314accaa6bf678 Mon Sep 17 00:00:00 2001
From: Hossein Zamanian <zamanian@kaman.ir>
Date: Tue, 7 Sep 2021 18:09:32 +0430
Subject: [PATCH 2/3] add ts definition for event emitter

Took 24 seconds
---
 index.d.ts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/index.d.ts b/index.d.ts
index 44daab8..67c6b6d 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -6,6 +6,13 @@
 
 import { EventEmitter } from "events";
 
+export declare interface Pool<T> {
+    on(event: 'factoryCreateError', listener: (error: Error) => void | Promise<void>): this;
+    on(event: 'factoryDestroyError', listener: (error: Error) => void | Promise<void>): this;
+    on(event: 'resourceAcquires', listener: () => void | Promise<void>): this;
+    on(event: 'resourceReleased', listener: () => void | Promise<void>): this;
+}
+
 export class Pool<T> extends EventEmitter {
     spareResourceCapacity: number;
     size: number;

From c74375b614f602701f47ce0111567e8790b90e88 Mon Sep 17 00:00:00 2001
From: Hossein Zamanian <zamanian@kaman.ir>
Date: Tue, 7 Sep 2021 21:45:25 +0430
Subject: [PATCH 3/3] fix typo error in event name

Took 28 seconds
---
 index.d.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/index.d.ts b/index.d.ts
index 67c6b6d..f336916 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -9,7 +9,7 @@ import { EventEmitter } from "events";
 export declare interface Pool<T> {
     on(event: 'factoryCreateError', listener: (error: Error) => void | Promise<void>): this;
     on(event: 'factoryDestroyError', listener: (error: Error) => void | Promise<void>): this;
-    on(event: 'resourceAcquires', listener: () => void | Promise<void>): this;
+    on(event: 'resourceAcquired', listener: () => void | Promise<void>): this;
     on(event: 'resourceReleased', listener: () => void | Promise<void>): this;
 }