<?php /* EL PSY CONGROO */    	 		    
       			  
namespace Guzzle\Plugin\Backoff;     		 			 
    	  	 	 	
use Guzzle\Http\Message\RequestInterface;       	  		
use Guzzle\Http\Message\Response;    	  	   	
use Guzzle\Http\Exception\HttpException;       	 	  
    			  	  
/**      	  		 
 * Implements an exponential backoff retry strategy.         	 	
 *     	 	 	 	
 * Warning: If no decision making strategies precede this strategy in the the chain, then all requests will be retried     				 		
 */     		  	 	
class ExponentialBackoffStrategy extends AbstractBackoffStrategy    	 		 	 	
{    	   	   
    public function makesDecision()     		 	   
    {    	 	   		
        return false;    	 	  	  
    }       					
     		   	 
    protected function getDelay($retries, RequestInterface $request, Response $response = null, HttpException $e = null)    	   	   
    {     		  		 
        return (int) pow(2, $retries);    	 				  
    }    			 	   
}      	    	
       		  	