// level 0 gives new leaf
public static IMd Create(int level)
{
var newMd = new InMemoryMd(level);
_allMds[newMd.MdLocator.Json()] = newMd;
return(newMd);
}
Result <Pointer> ExpandLevel(string key, StoredValue value)
{
if (Level == 0)
{
return(new ArgumentOutOfRange <Pointer>(nameof(Level)));
}
var md = InMemoryMd.Create(Level - 1);
var leafPointer = (md as InMemoryMd).Add(key, value);
if (!leafPointer.HasValue)
{
return(leafPointer);
}
switch (md.Type)
{
case MdType.Pointers: // i.e. we have still not reached the end of the tree
Add(new Pointer
{
MdLocator = md.MdLocator,
ValueType = typeof(Pointer).Name
});
break;
case MdType.Values: // i.e. we are now right above leaf level
Add(leafPointer.Value);
break;
default:
return(new ArgumentOutOfRange <Pointer>(nameof(md.Type)));
}
return(leafPointer);
}
public static IMd Locate(MdLocator location)
{
// try find on network
var key = location.Json();
if (!_allMds.ContainsKey(key)) // if not found, create with level 0
{
var md = InMemoryMd.Create(level: 0);
_allMds[md.MdLocator.Json()] = md;
return(md);
}
return(_allMds[key]);
}
public static void UseInMemoryDb()
{
SetCreator(level => Task.FromResult(InMemoryMd.Create(level)));
SetLocator(location => Task.FromResult(Result.OK(InMemoryMd.Locate(location))));
}
