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Here comes the tricky part: in Kafka Streams, sometimes we may encounter the requirement of materializing a windowed topic. In the source processor point of view, the windowed topic input should be (Windowed<K> key, V value). So our discussion could actually extend to four cases:

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1. Non-windowed topic materialized to key-value store (the most common case)
2. Non-windowed topic materialized to window store
3. Windowed topic materialized to key-value store (rare case, but possible)
4. Windowed topic materialized to window store

Here we want to be clear about case 2 and 4. When we materialize a windowed topic

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Public Interfaces

The current KTable API looks like:

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