kafka TimeWindow 源码
kafka TimeWindow 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/kstream/internals/TimeWindow.java
/*
* 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.kafka.streams.kstream.internals;
import org.apache.kafka.streams.kstream.Window;
/**
* A {@link TimeWindow} covers a half-open time interval with its start timestamp as an inclusive boundary and its end
* timestamp as exclusive boundary.
* It is a fixed size window, i.e., all instances (of a single {@link org.apache.kafka.streams.kstream.TimeWindows
* window specification}) will have the same size.
* <p>
* For time semantics, see {@link org.apache.kafka.streams.processor.TimestampExtractor TimestampExtractor}.
*
* @see SessionWindow
* @see UnlimitedWindow
* @see org.apache.kafka.streams.kstream.TimeWindows
* @see org.apache.kafka.streams.processor.TimestampExtractor
*/
public class TimeWindow extends Window {
/**
* Create a new window for the given start time (inclusive) and end time (exclusive).
*
* @param startMs the start timestamp of the window (inclusive)
* @param endMs the end timestamp of the window (exclusive)
* @throws IllegalArgumentException if {@code startMs} is negative or if {@code endMs} is smaller than or equal to
* {@code startMs}
*/
public TimeWindow(final long startMs, final long endMs) throws IllegalArgumentException {
super(startMs, endMs);
if (startMs == endMs) {
throw new IllegalArgumentException("Window endMs must be greater than window startMs.");
}
}
/**
* Check if the given window overlaps with this window.
*
* @param other another window
* @return {@code true} if {@code other} overlaps with this window—{@code false} otherwise
* @throws IllegalArgumentException if the {@code other} window has a different type than {@code this} window
*/
@Override
public boolean overlap(final Window other) throws IllegalArgumentException {
if (getClass() != other.getClass()) {
throw new IllegalArgumentException("Cannot compare windows of different type. Other window has type "
+ other.getClass() + ".");
}
final TimeWindow otherWindow = (TimeWindow) other;
return startMs < otherWindow.endMs && otherWindow.startMs < endMs;
}
}
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