pragma solidity ^0.4.24;

contract AssetRegistry{

    // Vairables
    struct oneasset{
        string  name;
        uint  timestamp;
    }

    mapping (string => oneasset) all_assets;

    event oneasset_event(
        string name,
        string url,
        uint timestamp
    );

    function setAsset(string _url,string _name,uint) public {

        require ( bytes(_url).length !=0 );
        require ( bytes(_name).length !=0 );
        require ( all_assets[_url].timestamp == 0 );

        all_assets[_url] = oneasset(_name, now);
        emit oneasset_event(_name,_url,now);
    }

    function getAsset(string _url) public view returns (string, uint) {
        return ( all_assets[_url].name , all_assets[_url].timestamp );
    }

}