interface PersistingStoreInterface

interface PersistingStoreInterface {
    
    /**
     * Stores the resource if it's not locked by someone else.
     *
     * @throws LockAcquiringException
     * @throws LockConflictedException
     */
    public function save(Key $key) : void;
    
    /**
     * Removes a resource from the storage.
     *
     * @throws LockReleasingException
     */
    public function delete(Key $key) : void;
    
    /**
     * Returns whether or not the resource exists in the storage.
     */
    public function exists(Key $key) : bool;
    
    /**
     * Extends the TTL of a resource.
     *
     * @param float $ttl amount of seconds to keep the lock in the store
     *
     * @throws LockConflictedException
     */
    public function putOffExpiration(Key $key, float $ttl) : void;

}