/** Writes the {@code Context} to the given state checkpoint output. */
protected void writeToState(StateBackend.CheckpointStateOutputView out) throws IOException {
keySerializer.serialize(key, out);
windowSerializer.serialize(window, out);
out.writeLong(watermarkTimer);
out.writeLong(processingTimeTimer);
byte[] serializedState = InstantiationUtil.serializeObject(state);
out.writeInt(serializedState.length);
out.write(serializedState, 0, serializedState.length);
MultiplexingStreamRecordSerializer<IN> recordSerializer =
new MultiplexingStreamRecordSerializer<>(inputSerializer);
out.writeInt(windowBuffer.size());
for (StreamRecord<IN> element : windowBuffer.getElements()) {
recordSerializer.serialize(element, out);
}
}
