public static ShardingEntityConfig Parse(Type entityType)
{
if (!typeof(IShardingEntity).IsAssignableFrom(entityType))
{
throw new NotSupportedException(entityType.ToString());
}
PropertyInfo[] shardingProperties = entityType.GetProperties();
ShardingEntityConfig shardingEntityConfig = null;
foreach (var shardingProperty in shardingProperties)
{
var attribbutes = shardingProperty.GetCustomAttributes(true);
if (attribbutes.FirstOrDefault(x => x.GetType() == typeof(ShardingKeyAttribute)) is ShardingKeyAttribute shardingKeyAttribute)
{
if (shardingEntityConfig != null)
{
throw new ArgumentException($"{entityType}存在多个[ShardingKeyAttribute]");
}
shardingEntityConfig = new ShardingEntityConfig()
{
ShardingMode = shardingKeyAttribute.ShardingMode,
ShardingEntityType = entityType,
BeginTableTimeStamp = shardingKeyAttribute.BeginTableTimeStamp,
ShardingField = shardingProperty.Name
};
}
}
return(shardingEntityConfig);
}
public ShardingOperatorFilterVisitor(ShardingEntityConfig shardingConfig, Func <object, TKey> shardingKeyConvert, Func <TKey, ShardingOperatorEnum, Expression <Func <string, bool> > > keyToTailWithFilter)
{
_shardingConfig = shardingConfig;
_shardingKeyConvert = shardingKeyConvert;
_keyToTailWithFilter = keyToTailWithFilter;
}
public static Func <string, bool> GetRouteObjectOperatorFilter <TKey>(IQueryable queryable, ShardingEntityConfig shardingConfig, Func <object, TKey> shardingKeyConvert, Func <TKey, ShardingOperatorEnum, Expression <Func <string, bool> > > keyToTailExpression)
{
ShardingOperatorFilterVisitor <TKey> visitor = new ShardingOperatorFilterVisitor <TKey>(shardingConfig, shardingKeyConvert, keyToTailExpression);
visitor.Visit(queryable.Expression);
return(visitor.GetStringFilterTail());
}
