/
TemporalOperator.java
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/
TemporalOperator.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.
*/
package org.apache.flink.streaming.api.datastream.temporaloperator;
import java.util.concurrent.TimeUnit;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.windowing.helper.SystemTimestamp;
import org.apache.flink.streaming.api.windowing.helper.Timestamp;
import org.apache.flink.streaming.api.windowing.helper.TimestampWrapper;
public abstract class TemporalOperator<I1, I2, OP extends TemporalWindow<OP>> {
public final DataStream<I1> input1;
public final DataStream<I2> input2;
public long windowSize;
public long slideInterval;
public TimestampWrapper<I1> timeStamp1;
public TimestampWrapper<I2> timeStamp2;
public TemporalOperator(DataStream<I1> input1, DataStream<I2> input2) {
if (input1 == null || input2 == null) {
throw new NullPointerException();
}
this.input1 = input1.copy();
this.input2 = input2.copy();
}
/**
* Continues a temporal transformation.<br/>
* Defines the window size on which the two DataStreams will be transformed.
* To define sliding windows call {@link TemporalWindow#every} on the
* resulting operator.
*
* @param length
* The size of the window in milliseconds.
* @param timeUnit
* The unit if time to be used
* @return An incomplete temporal transformation.
*/
@SuppressWarnings("unchecked")
public OP onWindow(long length, TimeUnit timeUnit) {
return onWindow(timeUnit.toMillis(length),
(TimestampWrapper<I1>) SystemTimestamp.getWrapper(),
(TimestampWrapper<I2>) SystemTimestamp.getWrapper());
}
/**
* Continues a temporal transformation.<br/>
* Defines the window size on which the two DataStreams will be
* transformed.To define sliding windows call {@link TemporalWindow#every}
* on the resulting operator.
*
* @param windowSize
* The size of the window in milliseconds.
* @param timeStamp1
* The timestamp used to extract time from the elements of the
* first data stream.
* @param timeStamp2
* The timestamp used to extract time from the elements of the
* second data stream.
* @return An incomplete temporal transformation.
*/
public OP onWindow(long length, Timestamp<I1> timeStamp1, Timestamp<I2> timeStamp2) {
return onWindow(length, timeStamp1, timeStamp2, 0);
}
/**
* Continues a temporal transformation.<br/>
* Defines the window size on which the two DataStreams will be
* transformed.To define sliding windows call {@link TemporalWindow#every}
* on the resulting operator.
*
* @param windowSize
* The size of the window in milliseconds.
* @param timeStamp1
* The timestamp used to extract time from the elements of the
* first data stream.
* @param timeStamp2
* The timestamp used to extract time from the elements of the
* second data stream.
* @param startTime
* The start time to measure the first window
* @return An incomplete temporal transformation.
*/
public OP onWindow(long length, Timestamp<I1> timeStamp1, Timestamp<I2> timeStamp2,
long startTime) {
return onWindow(length, new TimestampWrapper<I1>(timeStamp1, startTime),
new TimestampWrapper<I2>(timeStamp2, startTime));
}
private OP onWindow(long length, TimestampWrapper<I1> timeStamp1,
TimestampWrapper<I2> timeStamp2) {
this.windowSize = length;
this.slideInterval = length;
this.timeStamp1 = timeStamp1;
this.timeStamp2 = timeStamp2;
return createNextWindowOperator();
}
protected abstract OP createNextWindowOperator();
}