MyName
  MyModule
    Ekomi
      Request
        ..
      Service
        ..
      Api.php
    etc
      ..
    Helper
      ..
    composer.json
    registration.php

{
  "name": "MyName/MyModule",
  "description": "N/A",
  "require": {
    "php": "~5.5.22|~5.6.0|~7.0.0"
  },
  "type": "magento2-module",
  "version": "1.0.0",
  "license": [
    "OSL-3.0",
    "AFL-3.0"
  ],
  "autoload": {
    "files": [
      "registration.php"
    ],
    "psr-4": {
      "Magento\Catalog\": "",
      "Ekomi\": "Ekomi/"
    }
  }
}

Compilation was started.
Proxies code generation... 0/7 [>---------------------------]   0% 1 sec 46.0 Mi
Proxies code generation... 1/7 [====>-----------------------]  14% 1 sec 50.0 Mi
Repositories code generation... 1/7 [====>-----------------------]  14% 1 sec 500 MiB
PHP Fatal error:  Class 'EkomiRequestAbstractRequest' not found in /var/www/magento2/app/code/MyName/MyModule/Ekomi/Request/GetProduct.php on line 8

$vendorDir = require BP . '/app/etc/vendor_path.php';
$vendorAutoload = BP . "/{$vendorDir}/autoload.php";
/** @var ComposerAutoloadClassLoader $composerAutoloader */
$composerAutoloader = include $vendorAutoload;
$composerAutoloader->addPsr4('Ekomi\', array(__DIR__ . '/Ekomi'));

$objPHPExcel = new PHPExcel();
$objPHPExcel->setActiveSheetIndex(0)
    ->setCellValue('A1', 'Hello')
    ->setCellValue('B1', 'world!');

$fn = $this->fileSystem
    ->getDirectoryWrite(DirectoryList::VAR_DIR)
    ->getAbsolutePath('/') .'report_'.time().'.xlsx';

$objWriter = new PHPExcel_Writer_Excel2007($objPHPExcel);
$objWriter->save($fn);

$objPHPExcel = new PHPExcel_PHPExcel();

require_once(BP.'/lib/internal/foo/include.php');