@Override
    protected StateFactory init(MetaStreamEvent metaStreamEvent,
                                AbstractDefinition inputDefinition,
                                ExpressionExecutor[] attributeExpressionExecutors,
                                ConfigReader configReader, StreamEventClonerHolder streamEventClonerHolder,
                                boolean outputExpectsExpiredEvents, boolean findToBeExecuted,
                                SiddhiQueryContext siddhiQueryContext) {
        return null;
    }
{@link Window} from which the events have to be found.
modules/siddhi-core/src/main/java/io/siddhi/core/query/processor/stream/window/WindowWindowProcessor.java