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[streaming] WindowBuffer interface added for preaggregator logic + si…
…mple tumbling prereducer
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74 changes: 74 additions & 0 deletions
74
...n/java/org/apache/flink/streaming/api/invokable/operator/windowing/BasicWindowBuffer.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.streaming.api.invokable.operator.windowing; | ||
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| import java.util.LinkedList; | ||
| import java.util.NoSuchElementException; | ||
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| import org.apache.flink.util.Collector; | ||
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| public class BasicWindowBuffer<T> implements WindowBuffer<T> { | ||
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| private static final long serialVersionUID = 1L; | ||
| protected LinkedList<T> buffer; | ||
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| public BasicWindowBuffer() { | ||
| this.buffer = new LinkedList<T>(); | ||
| } | ||
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| public boolean emitWindow(Collector<StreamWindow<T>> collector) { | ||
| if (!buffer.isEmpty()) { | ||
| StreamWindow<T> currentWindow = new StreamWindow<T>(); | ||
| currentWindow.addAll(buffer); | ||
| collector.collect(currentWindow); | ||
| return true; | ||
| } else { | ||
| return false; | ||
| } | ||
| } | ||
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| public void store(T element) throws Exception { | ||
| buffer.add(element); | ||
| } | ||
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| public void evict(int n) { | ||
| for (int i = 0; i < n; i++) { | ||
| try { | ||
| buffer.removeFirst(); | ||
| } catch (NoSuchElementException e) { | ||
| // In case no more elements are in the buffer: | ||
| // Prevent failure and stop deleting. | ||
| break; | ||
| } | ||
| } | ||
| } | ||
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| public int size() { | ||
| return buffer.size(); | ||
| } | ||
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| @Override | ||
| public BasicWindowBuffer<T> clone() { | ||
| return new BasicWindowBuffer<T>(); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return buffer.toString(); | ||
| } | ||
| } |
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