| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.apex.malhar.lib.window.impl; |
| |
| import org.apache.apex.malhar.lib.window.Accumulation; |
| import org.apache.apex.malhar.lib.window.TriggerOption; |
| import org.apache.apex.malhar.lib.window.Tuple; |
| import org.apache.apex.malhar.lib.window.Window; |
| import org.apache.apex.malhar.lib.window.WindowedStorage; |
| import org.apache.hadoop.classification.InterfaceStability; |
| |
| /** |
| * This is an implementation of the WindowedOperator. If your operation is key based, please use {@link KeyedWindowedOperatorImpl}. |
| * |
| * @param <InputT> The type of the value of the input tuple |
| * @param <AccumT> The type of the accumulated value in the operator state per window |
| * @param <OutputT> The type of the value of the output tuple |
| * |
| * @since 3.5.0 |
| */ |
| @InterfaceStability.Evolving |
| public class WindowedOperatorImpl<InputT, AccumT, OutputT> |
| extends AbstractWindowedOperator<InputT, OutputT, WindowedStorage<AccumT>, WindowedStorage<OutputT>, Accumulation<InputT, AccumT, OutputT>> |
| { |
| @Override |
| public void accumulateTuple(Tuple.WindowedTuple<InputT> tuple) |
| { |
| for (Window window : tuple.getWindows()) { |
| // process each window |
| AccumT accum = dataStorage.get(window); |
| if (accum == null) { |
| accum = accumulation.defaultAccumulatedValue(); |
| } |
| dataStorage.put(window, accumulation.accumulate(accum, tuple.getValue())); |
| } |
| } |
| |
| @Override |
| public void fireNormalTrigger(Window window, boolean fireOnlyUpdatedPanes) |
| { |
| AccumT accumulatedValue = dataStorage.get(window); |
| OutputT outputValue = accumulation.getOutput(accumulatedValue); |
| if (fireOnlyUpdatedPanes) { |
| OutputT oldValue = retractionStorage.get(window); |
| if (oldValue != null && oldValue.equals(outputValue)) { |
| return; |
| } |
| } |
| output.emit(new Tuple.WindowedTuple<>(window, outputValue)); |
| if (retractionStorage != null) { |
| retractionStorage.put(window, outputValue); |
| } |
| } |
| |
| @Override |
| public void fireRetractionTrigger(Window window) |
| { |
| if (triggerOption.getAccumulationMode() != TriggerOption.AccumulationMode.ACCUMULATING_AND_RETRACTING) { |
| throw new UnsupportedOperationException(); |
| } |
| OutputT oldValue = retractionStorage.get(window); |
| if (oldValue != null) { |
| output.emit(new Tuple.WindowedTuple<>(window, accumulation.getRetraction(oldValue))); |
| } |
| } |
| } |