/**
  * Describe Spot Instance Requests 
  * Describes Spot Instance requests. Spot Instances are instances that automatically launch when your
  * request price exceeds the Spot Price that Amazon EC2 periodically calculates.
  * @see http://docs.amazonwebservices.com/AWSEC2/2009-11-30/DeveloperGuide/ApiReference-Query-DescribeSpotInstanceRequests.html
  * @param mixed $request array of parameters for Amazon_EC2_Model_DescribeSpotInstanceRequestsRequest request
  * or Amazon_EC2_Model_DescribeSpotInstanceRequestsRequest object itself
  * @see Amazon_EC2_Model_DescribeSpotInstanceRequests
  * @return Amazon_EC2_Model_DescribeSpotInstanceRequestsResponse Amazon_EC2_Model_DescribeSpotInstanceRequestsResponse
  *
  * @throws Amazon_EC2_Exception
  */
 public function describeSpotInstanceRequests($request)
 {
     if (!$request instanceof Amazon_EC2_Model_DescribeSpotInstanceRequestsRequest) {
         require_once 'Amazon/EC2/Model/DescribeSpotInstanceRequestsRequest.php';
         $request = new Amazon_EC2_Model_DescribeSpotInstanceRequestsRequest($request);
     }
     require_once 'Amazon/EC2/Model/DescribeSpotInstanceRequestsResponse.php';
     return Amazon_EC2_Model_DescribeSpotInstanceRequestsResponse::fromXML($this->_invoke($this->_convertDescribeSpotInstanceRequests($request)));
 }
 /**
  * Describe Spot Instance Requests 
  * Describes Spot Instance requests. Spot Instances are instances that automatically launch when your
  * request price exceeds the Spot Price that Amazon EC2 periodically calculates.  
  * @see http://docs.amazonwebservices.com/AWSEC2/2009-11-30/DeveloperGuide/ApiReference-Query-DescribeSpotInstanceRequests.html      
  * @param mixed $request array of parameters for Amazon_EC2_Model_DescribeSpotInstanceRequests request or Amazon_EC2_Model_DescribeSpotInstanceRequests object itself
  * @see Amazon_EC2_Model_DescribeSpotInstanceRequests
  * @return Amazon_EC2_Model_DescribeSpotInstanceRequestsResponse Amazon_EC2_Model_DescribeSpotInstanceRequestsResponse
  *
  * @throws Amazon_EC2_Exception
  */
 public function describeSpotInstanceRequests($request)
 {
     require_once 'Amazon/EC2/Model/DescribeSpotInstanceRequestsResponse.php';
     return Amazon_EC2_Model_DescribeSpotInstanceRequestsResponse::fromXML($this->_invoke('DescribeSpotInstanceRequests'));
 }