Clean code.

src/js/app.js

@@ -1,49 +1,13 @@
 const express = require('express');
-const ObjectId = require('mongodb').ObjectId;
 const bodyParser = require('body-parser');
+const applicationController = require('./controller/applicationCtrl');
 
-const MongoClient = require('./mongoClient');
-const Repository = require('./repository');
+const port = 3000;
 
 const app = express();
 app.use(bodyParser.urlencoded({ extended: true }));
 app.use(bodyParser.json());
-const port = 3000;
 
-const mongoClient = new MongoClient();
-const applicationRepository = new Repository('applications', mongoClient);
-
-app.get('/apps', (request, response) => {
-    applicationRepository.find({}, results => {
-        response.json(results);
-    });
-});
-
-app.post('/apps', (request, response) => {
-    applicationRepository.insert(request.body, (result) => {
-        response.json(result);
-    });
-});
-
-app.put('/apps/:applicationId', (request, response) => {
-    const applicationId = ObjectId(request.params.applicationId);
-    applicationRepository.find({_id: applicationId}, entity => {
-        if (entity.length === 0) {
-            response.status(404).send();
-        } else {
-            const applicationToUpdate = request.body;
-            applicationToUpdate._id = applicationId;
-            applicationRepository.update(applicationToUpdate, () => {
-                response.status(204).send();
-            });
-        }
-    });
-});
-
-app.delete('/apps/:applicationId', (request, response) => {
-    applicationRepository.delete(request.params.applicationId, () => {
-        response.status(200).send('Deleted');
-    });
-});
+app.use('/apps', applicationController);
 
 app.listen(port, () => console.log('Mock is listening at port ', port, '\n'));

src/js/configuration.js

@@ -0,0 +1,8 @@
+module.exports = {
+    database: {
+        url: 'mongodb://localhost:27017',
+        username: 'express-user',
+        password: 'P@ssword1',
+        database: 'express-test'
+    }
+};

src/js/controller/applicationCtrl.js

@@ -0,0 +1,47 @@
+const ObjectId = require('mongodb').ObjectId;
+const Repository = require('../repository/repository');
+const router = require('express').Router();
+
+const applicationRepository = new Repository('applications');
+
+router.get('/', (request, response) => {
+    applicationRepository.find({}, results => {
+        response.json(results);
+    });
+});
+
+router.post('/', (request, response) => {
+    applicationRepository.insert(request.body, (result) => {
+        response.json(result);
+    });
+});
+
+router.put('/:applicationId', (request, response) => {
+    const applicationId = ObjectId(request.params.applicationId);
+    applicationRepository.find({_id: applicationId}, entity => {
+        if (entity.length === 0) {
+            response.status(404).send();
+        } else {
+            const applicationToUpdate = request.body;
+            applicationToUpdate._id = applicationId;
+            applicationRepository.update(applicationToUpdate, () => {
+                response.status(204).send();
+            });
+        }
+    });
+});
+
+router.delete('/:applicationId', (request, response) => {
+    const applicationId = ObjectId(request.params.applicationId);
+    applicationRepository.find({_id: applicationId}, entity => {
+        if (entity.length === 0) {
+            response.status(404).send();
+        } else {
+            applicationRepository.delete(applicationId, () => {
+                response.status(204).send();
+            });
+        }
+    });
+});
+
+module.exports = router;

src/js/repository/mongoClient.js

@@ -1,29 +1,25 @@
 const mongodb = require('mongodb');
 const assert = require('assert');
 
-const mongoConfig = {
-    url: 'mongodb://localhost:27017',
-    username: 'express-user',
-    password: 'P@ssword1',
-    database: 'express-test'
-};
+const configuration = require('../configuration');
+const mongoConfig = configuration.database;
 
 class MongoClient {
     constructor() {
-        mongodb.MongoClient.connect(mongoConfig.url, (err, client) => {
-            assert.equal(null, err);
+        mongodb.MongoClient.connect(mongoConfig.url, (error, client) => {
+            assert.equal(null, error, `Unable to connect to mongodb: ${error}.`);
             console.log('Connected successfuly to mongodb');
             this.db = client.db(mongoConfig.database);
         });
     }
 
-    find(collectionName, query, successCallback, errorCallback) {
+    find(collectionName, query, callback) {
         this.db.collection(collectionName).find(query).toArray()
             .then(results => {
                 console.log(`Entities ${collectionName} founded.`);
-                successCallback(results);
+                callback(results);
             })
-            .catch(errorCallback);
+            .catch(error => console.error(error));
     }
 
     insert(collectionName, entity, callback) {
@@ -52,4 +48,5 @@ class MongoClient {
     }
 }
 
-module.exports = MongoClient;
+const mongoClient = new MongoClient();
+module.exports = mongoClient;

src/js/repository/repository.js

@@ -1,11 +1,13 @@
-module.exports = class Repository {
-    constructor(collectionName, mongoClient) {
+const mongoClient = require('./mongoClient');
+
+class Repository {
+    constructor(collectionName) {
         this.collectionName = collectionName;
         this.mongoClient = mongoClient;
     }
 
-    find(query, successCallback, errorCallback) {
-        this.mongoClient.find(this.collectionName, query, successCallback, errorCallback);
+    find(query, callback) {
+        this.mongoClient.find(this.collectionName, query, callback);
     }
 
     insert(entity, callback) {
@@ -20,3 +22,5 @@ module.exports = class Repository {
         this.mongoClient.delete(this.collectionName, entityId, callback);
     }
 };
+
+module.exports = Repository;