test.php

<?php

interface Reporter {
  /** @return string */
  public function getSupportedContext();
  
  /** @return array */
  public function getHandlers();
}

class MySQLFeedReporter implements Reporter {
  public function getHandlers() {
    return [
      'totalSummary' => 'getTotalSummary'
    ];
  }
  
  public function getTotalSummary () {
    return // some logic
  }
}

class RedisFeedReporter implements Reporter {
  public function getHandlers() {
    return [
      'totalSummary' => 'getTotalSummary'
    ];
  }
  
}

class