public async IAsyncEnumerable <TDataType> ReadIndex <TDataType, TKeyType>(TKeyType key,
Expression <Func <TDataType, TKeyType> > indexProperty) where TDataType : DataEntity
{
var indexMember = ((MemberExpression)indexProperty.Body).Member;
using (Logger.BeginScope("{Operation} is {Action} {IndexName} for {DataType} with a key {key}",
nameof(DataManager), "read from index", indexMember.Name, typeof(TDataType).Name, key))
{
if (indexMember.IsDefined(typeof(IndexAttribute), true))
{
Logger.LogTrace("Property is indexed");
var indexName = indexMember.Name;
if (await IndexWorker.IndexExist <TDataType>(indexName))
{
Logger.LogTrace("Index exists");
var ids = IndexWorker.GetIdsFromIndex <TDataType, TKeyType>(indexName, key);
Logger.LogInformation("Found ids in index", ids, key);
await foreach (var id in ids)
{
yield return(await Read <TDataType>(id));
}
}
yield break;
}
Logger.LogWarning("The property used is not marked as indexed");
}
}
public async IAsyncEnumerable <IndexKey <TKeyType> > ReadIndexKeys <TDataType, TKeyType>(Expression <Func <TDataType, TKeyType> > indexProperty) where TDataType : DataEntity
{
var indexMember = ((MemberExpression)indexProperty.Body).Member;
using (Logger.BeginScope("{Operation} is {Action} {IndexName} for {DataType}",
nameof(DataManager), "getting keys from index", indexMember.Name, typeof(TDataType).Name))
{
if (indexMember.IsDefined(typeof(IndexAttribute), true))
{
Logger.LogTrace("Property is indexed");
var indexName = indexMember.Name;
if (await IndexWorker.IndexExist <TDataType>(indexName))
{
var keys = IndexWorker.GetKeysFromIndex <TDataType, TKeyType>(indexName);
Logger.LogInformation("Found keys in index", keys);
await foreach (var key in keys)
{
yield return(key);
}
}
yield break;
}
Logger.LogWarning("The property used is not marked as indexed");
}
}