kafka UnlimitedWindow 源码
kafka UnlimitedWindow 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/kstream/internals/UnlimitedWindow.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;
/**
* {@link UnlimitedWindow} is an "infinite" large window with a fixed (inclusive) start time.
* All windows of the same {@link org.apache.kafka.streams.kstream.UnlimitedWindows window specification} will have the
* same start time.
* To make the window size "infinite" end time is set to {@link Long#MAX_VALUE}.
* <p>
* For time semantics, see {@link org.apache.kafka.streams.processor.TimestampExtractor TimestampExtractor}.
*
* @see TimeWindow
* @see SessionWindow
* @see org.apache.kafka.streams.kstream.UnlimitedWindows
* @see org.apache.kafka.streams.processor.TimestampExtractor
*/
public class UnlimitedWindow extends Window {
/**
* Create a new window for the given start time (inclusive).
*
* @param startMs the start timestamp of the window (inclusive)
* @throws IllegalArgumentException if {@code start} is negative
*/
public UnlimitedWindow(final long startMs) {
super(startMs, Long.MAX_VALUE);
}
/**
* Returns {@code true} if the given window is of the same type, because all unlimited windows overlap with each
* other due to their infinite size.
*
* @param other another window
* @return {@code true}
* @throws IllegalArgumentException if the {@code other} window has a different type than {@code this} window
*/
@Override
public boolean overlap(final Window other) {
if (getClass() != other.getClass()) {
throw new IllegalArgumentException("Cannot compare windows of different type. Other window has type "
+ other.getClass() + ".");
}
return true;
}
}
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