public void Add(TKey key, TValue value)
{
SyncVersionList <TValue> list;
bool found = this.data.TryGetValue(key, out list);
if (!found)
{
list = SyncVersionList <TValue> .Create(new ValueVersion <TValue>(this.version + 1, value));
}
else
{
list.Add(new ValueVersion <TValue>(this.version + 1, value));
}
if (!found)
{
// TODO need to make SyncVersionList class for this to be atomic.
this.data[key] = list;
}
// version is incremented after so that readers who start while `Add` has not finished
// don't observe new value.
// disallow reordering of next statement ? volatile `version`.
this.version += 1;
}
static public SyncVersionList <T> Create(ValueVersion <T> value)
{
var ret = new SyncVersionList <T>();
ret.Initliaze(value);
return(ret);
}