public override void Process(K key, V value)
{
// If the key or value is null we don't need to proceed
if (key == null || value == null)
{
log.Warn($"Skipping record due to null key or value. key=[{key}] value=[{value}] topic=[{Context.Topic}] partition=[{Context.Partition}] offset=[{Context.Offset}]");
return;
}
ValueAndTimestamp <V> oldAggAndTimestamp = store.Get(key);
V oldAgg, newAgg;
long newTimestamp;
if (oldAggAndTimestamp == null)
{
oldAgg = default;
newAgg = value;
newTimestamp = Context.Timestamp;
}
else
{
oldAgg = oldAggAndTimestamp.Value;
newAgg = reducer.Apply(oldAgg, value);
newTimestamp = Math.Max(Context.Timestamp, oldAggAndTimestamp.Timestamp);
}
store.Put(key, ValueAndTimestamp <V> .Make(newAgg, newTimestamp));
tupleForwarder.MaybeForward(key, newAgg, sendOldValues ? oldAgg : default, newTimestamp);
public override void Process(K key, Change <V> value)
{
// the keys should never be null
if (key == null)
{
throw new StreamsException($"Record key for KTable reduce operator with state {queryableStoreName} should not be null.");
}
ValueAndTimestamp <V> oldAggAndTimestamp = store.Get(key);
V oldAgg = oldAggAndTimestamp != null ? oldAggAndTimestamp.Value : default;
V intermediateAgg;
long newTimestamp = Context.Timestamp;
// first try to remove the old value
if (oldAggAndTimestamp != null && value.OldValue != null && oldAgg != null)
{
intermediateAgg = substractor.Apply(oldAgg, value.OldValue);
newTimestamp = Math.Max(Context.Timestamp, oldAggAndTimestamp.Timestamp);
}
else
{
intermediateAgg = oldAgg;
}
// then try to add the new value
V newAgg;
if (value.NewValue != null)
{
if (intermediateAgg == null)
{
newAgg = value.NewValue;
}
else
{
newAgg = adder.Apply(intermediateAgg, value.NewValue);
}
if (oldAggAndTimestamp != null)
{
newTimestamp = Math.Max(Context.Timestamp, oldAggAndTimestamp.Timestamp);
}
}
else
{
newAgg = intermediateAgg;
}
// update the store with the new value
store.Put(key, ValueAndTimestamp <V> .Make(newAgg, newTimestamp));
tupleForwarder.MaybeForward(key, newAgg, sendOldValues ? oldAgg : default, newTimestamp);