protected internal Shard(ShardSet set, IConfigSectionNode conf)
{
m_Set = set.NonNull(nameof(set));
ConfigAttribute.Apply(this, conf.NonEmpty(nameof(conf)));
m_Name = conf.ValOf(Configuration.CONFIG_NAME_ATTR).NonBlank("$name");
m_NameHash = ShardKey.ForString(m_Name);
m_Weight = conf.Of(CONFIG_WEIGHT_ATTR).ValueAsDouble(1.0d);
m_ConnectString = conf.Of(CONFIG_CONNECT_ATTR, CONFIG_CONNECT_STRING_ATTR).Value.NonBlank($"${CONFIG_CONNECT_ATTR}");
m_DatabaseName = conf.Of(CONFIG_DB_ATTR).Value.NonBlank($"${CONFIG_DB_ATTR}");
}
/// <summary>
/// Here we implement pattern matching score logic. The higher = the better the match.
/// The 'pattern' parameter delivers the config vector from [StrategyPattern(....)] candidates
/// </summary>
public double GetPatternMatchScore(IConfigSectionNode pattern)
{
//for flexibility: attribute is optional
var center = pattern.ValOf("center");
if (center.IsNullOrWhiteSpace())
{
return(0);
}
//calc the distance between to LAT/LNG in KM
var distance = Location.HaversineEarthDistanceKm(new LatLng(center));
//the smaller the distance - the higher the score
var ratio = LatLng.EARTH_CIRCUMFERENCE_KM / (distance == 0 ? 0.001 : distance);
return(ratio);//is the score for this case
}
/// <summary>
/// By sister city names
/// </summary>
public double GetPatternMatchScore(IConfigSectionNode pattern)
=> Location.Name.EqualsIgnoreCase(pattern.ValOf("sister")) ? 10000 : 0;