<?php 
namespace Aws\DynamoDb; 
 
/** 
 * The session connection provides the underlying logic for interacting with 
 * Amazon DynamoDB and performs all of the reading and writing operations. 
 */ 
interface SessionConnectionInterface 
{ 
    /** 
     * Reads session data from DynamoDB 
     * 
     * @param string $id Session ID 
     * 
     * @return array 
     */ 
    public function read($id); 
 
    /** 
     * Writes session data to DynamoDB 
     * 
     * @param string $id        Session ID 
     * @param string $data      Serialized session data 
     * @param bool   $isChanged Whether or not the data has changed 
     * 
     * @return bool 
     */ 
    public function write($id, $data, $isChanged); 
 
    /** 
     * Deletes session record from DynamoDB 
     * 
     * @param string $id Session ID 
     * 
     * @return bool 
     */ 
    public function delete($id); 
 
    /** 
     * Performs garbage collection on the sessions stored in the DynamoDB 
     * 
     * @return bool 
     */ 
    public function deleteExpired(); 
} 
 
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