kafka PositionBound 源码
kafka PositionBound 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/query/PositionBound.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.query;
import org.apache.kafka.common.annotation.InterfaceStability.Evolving;
import java.util.Objects;
/**
* A class bounding the processing state {@link Position} during queries. This can be used to
* specify that a query should fail if the locally available partition isn't caught up to the
* specified bound. "Unbounded" places no restrictions on the current location of the partition.
*/
@Evolving
public class PositionBound {
private final Position position;
private PositionBound(final Position position) {
this.position = position.copy();
}
/**
* Creates a new PositionBound representing "no bound"
*/
public static PositionBound unbounded() {
return new PositionBound(Position.emptyPosition());
}
/**
* Creates a new PositionBound representing a specific position.
*/
public static PositionBound at(final Position position) {
return new PositionBound(position);
}
/**
* Returns true iff this object specifies that there is no position bound.
*/
public boolean isUnbounded() {
return position.isEmpty();
}
/**
* Returns the specific position of this bound.
*/
public Position position() {
return position;
}
@Override
public String toString() {
return "PositionBound{position=" + position + '}';
}
@Override
public boolean equals(final Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
final PositionBound that = (PositionBound) o;
return Objects.equals(position, that.position);
}
@Override
public int hashCode() {
throw new UnsupportedOperationException(
"This mutable object is not suitable as a hash key");
}
}
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