feat(#36): create event to handle the scaleDown of objects

Co-authored-by: nukdown <nukdown@aluno.unb.br>

lib/service.js

@@ -1,6 +1,7 @@
 'use strict'
 
 const axios = require('axios');
+const EventEmitter = require('events')
 
 class Service {
   constructor(name, baseUrl) {
@@ -15,30 +16,42 @@ class Service {
 }
 
 class ServicePool  {
-	constructor(numMaxServices, servicesInfo){
-		this.numMaxServices = numMaxServices
-		const services = Objects.keys(servicesInfo)
+	constructor(servicesInfos){
+		this.emitter = EventEmmiter()
+		this.servicesInfos = servicesInfos
+		this._eventRelease = 'releaseService'
+		this.emitter.on(this._eventRelease, this.scaleDownServices(serviceName))
 
-		services.forEach((service) => {
-			let s = new Service(service, servicesInfo[service])
+		const services = Objects.keys(servicesInfos)
 
+		services.forEach((service) => {
 			this.serviceList[service] = []
+
+			let s = new Service(service, servicesInfos[service])
 			this.servicesList[service].push(s)
 		})
 	}
 
 	acquire(serviceName) {
-		if(this.serviceList[serviceName].length === 0 ){
-			// TODO: Create new
+		if(this.serviceList[serviceName].length === 0){
+			if(this.servicesInfos[serviceName] !== undefined) {
+				let s = new Service(serviceName, servicesInfos[service])
+				this.servicesList[service].push(s)
+			}
 		}
 		return this.serviceList[serviceName].pop()
 	}
 
 	release(service) {
 		this.serviceList[service.name].push(service)
-		// TODO: emit event
+		this.emmiter.emit(this._eventRelease, service.name)
 	}
 
+	scaleDownServices(serviceName) {
+		if(this.serviceList[serviceName].length > 1) {
+			delete this.serviceList[serviceName].pop()
+		}
+	}
 }
 
 module.exports = {